CN119212975A

CN119212975A - Compound, material for organic electroluminescent element, organic electroluminescent element, and electronic device

Info

Publication number: CN119212975A
Application number: CN202380040034.0A
Authority: CN
Inventors: 高桥佑典; 丝井裕亮; 田中将太; 泽藤司; 深见拓人
Original assignee: Idemitsu Kosan Co Ltd
Current assignee: Idemitsu Kosan Co Ltd
Priority date: 2022-05-18
Filing date: 2023-05-16
Publication date: 2024-12-27
Also published as: JP7710104B2; KR20250012056A; WO2023224020A1; JP2025148398A; JPWO2023224020A1

Abstract

A compound represented by the following formula (1), an organic electroluminescent element comprising the compound, and an electronic device comprising the organic electroluminescent element. The symbols in the formula (1) are defined as the specification.

Description

Compound, material for organic electroluminescent element, and electronic device

Technical Field

The present invention relates to a compound, a material for an organic electroluminescent element, and an electronic device including the organic electroluminescent element.

Background

In general, an organic electroluminescent element (hereinafter, also referred to as an "organic EL element") is composed of an anode, a cathode, and an organic layer interposed between the anode and the cathode. When a voltage is applied between the electrodes, electrons are injected from the cathode side into the light-emitting region, holes are injected from the anode side into the light-emitting region, and the injected electrons and holes recombine in the light-emitting region to generate an excited state, and light is emitted when the excited state returns to the ground state. Therefore, it was found that a combination of materials that efficiently transport electrons or holes to a light-emitting region and allow the electrons and holes to be easily recombined so that excitons efficiently emit light is important in obtaining a high-performance organic EL element.

Patent documents 1 to 13 disclose compounds used as materials for organic electroluminescent elements.

Prior art literature

Patent literature

Patent document 1 Chinese patent publication No. 111675701

Patent document 2 Chinese patent publication No. 109096179

Patent document 3 Korean laid-open patent publication No. 10-2019-0035567

Patent document 4 Korean laid-open patent publication No. 10-2018-0066855

Patent document 5 U.S. patent application publication 2016/0293843

Patent document 6 U.S. patent application publication No. 2015/0179953 specification

Patent document 7 U.S. patent application publication 2016/0301005 specification

Patent document 8 Korean laid-open patent publication No. 10-2018-016740

Patent document 9 U.S. patent application publication No. 2017/0194569 specification

Patent document 10 U.S. patent application publication No. 2017/0186978 specification

Patent document 11 U.S. patent application publication No. 2017/0186969 specification

Patent document 12 Korean laid-open patent publication No. 10-2019-0005522

Patent document 13 International publication No. 2021/045590

Disclosure of Invention

Problems to be solved by the invention

A large number of compounds for organic EL elements have been reported in the past, but there is still a need for further improvement in the performance of organic EL elements.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a compound that further improves the performance of an organic EL element, an organic EL element with further improved element performance, and an electronic device including such an organic EL element.

Means for solving the problems

The present inventors have conducted intensive studies on the performance of an organic EL element comprising the compound described in patent documents 1 to 13, and as a result, have found that the performance of an organic EL element comprising the compound represented by the following formula (1) is further improved.

In one embodiment, the present invention provides a compound represented by the following formula (1).

[ Chemical formula 1]

(In the formula (1),

N is a central nitrogen atom.

One of R ^a and R ^b is a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, and the other is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms or a substituted or unsubstituted heterocyclic group having 5 to 30 ring-forming carbon atoms.

Wherein R ^a and R ^b may be bonded to each other to form a substituted or unsubstituted ring.

1 Selected from R ²、R³、R⁶ and R ⁷ is a single bond bonded with 1, R ¹、R⁴、R⁵、R⁸ and R ²、R³、R⁶ and R ⁷ which are not single bonds bonded with 1 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 15 ring-forming carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms or a substituted or unsubstituted heterocyclic group having 5 to 13 ring-forming carbon atoms.

Adjacent 2 selected from R ¹、R⁴、R⁵、R⁸ and R ²、R³、R⁶ and R ⁷ which are not single bonds as described above are not bonded to each other and thus do not form a ring.

R ¹¹～R¹⁴ is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms or a substituted or unsubstituted aryl group having 6 to 18 ring-forming carbon atoms.

Adjacent 2 selected from R ¹¹～R¹⁴ are not bonded to each other and thus do not form a ring.

L ¹～L⁴ is independently a single bond or arylene group having 6 to 30 ring-forming carbon atoms.

Ar ¹ and Ar ² are groups represented by any one of the following formulas (1 a) to (1 g).

[ Chemical formula 2]

(In the formula (1 a),

*21 Is a bonding position with L ¹ or L ².

1 Selected from R ¹⁰¹～R¹⁰⁵ is a single bond with x 22, 1 selected from R ¹⁰⁶～R¹¹⁰ is a single bond with x 23, and 1 selected from R ¹¹¹～R¹¹⁵ is a single bond with x 24.

R ¹⁰¹～R¹¹⁵ other than the above single bond is each independently a hydrogen atom, an unsubstituted alkyl group having 1 to 10 carbon atoms or an unsubstituted aryl group having 6 to 12 ring-forming carbon atoms.

Adjacent 2 selected from R ¹⁰¹～R¹⁰⁵ other than the above single bond are not bonded to each other and thus do not form a ring,

Adjacent 2 selected from R ¹⁰⁶～R¹¹⁰ other than the above single bond are not bonded to each other and thus do not form a ring,

Adjacent 2 selected from R ¹¹¹～R¹¹⁵ which is not the above single bond are not bonded to each other and thus do not form a ring.

M is 0 or 1, n is 0 or 1, and 1 is 0 or 1.

R ¹¹⁶～R¹²⁰ is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 13 ring-forming carbon atoms.

Adjacent 2 selected from R ¹¹⁶～R¹²⁰ are not bonded to each other and thus do not form a ring. )

[ Chemical formula 3]

(In the formula (1 b),

*25 Is the bonding position with L ¹ or L ².

1 Selected from R ¹²¹～R¹²⁸ is a single bond to x 26.

R ¹²¹～R¹²⁸ other than the above single bond is each independently a hydrogen atom, an unsubstituted alkyl group having 1 to 10 carbon atoms or an unsubstituted aryl group having 6 to 12 ring-forming carbon atoms.

Adjacent 2 selected from R ¹²¹～R¹²⁸ which is not the above single bond are not bonded to each other and thus do not form a ring.

Wherein, when L ¹ is p-phenylene and Ar ¹ is represented by formula (1 b), 1 selected from R ¹²¹、R¹²⁴、R¹²⁵ and R ¹²⁸ in the group represented by formula (1 b) bonded to the p-phenylene is a single bond bonded to 26,

When L ² is p-phenylene and Ar ² is represented by formula (1 b), 1 of the groups represented by formula (1 b) bonded to the p-phenylene is a single bond bonded to x 26 selected from R ¹²¹、R¹²⁴、R¹²⁵ and R ¹²⁸. )

[ Chemical formula 4]

(In the formula (1 c),

*27 Is the bonding position to L ¹ or L ².

1 Selected from R ¹³¹～R¹⁴⁰ is a single bond to x 28.

R ¹³¹～R¹⁴⁰ which is not the single bond is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms.

Adjacent 2 selected from R ¹³¹～R¹⁴⁰ which is not the above single bond are not bonded to each other and thus do not form a ring. )

[ Chemical formula 5]

(In the formula (1 d),

*29 Is the bonding position with L ¹ or L ².

1 Selected from R ¹⁴¹～R¹⁵² is a single bond to x 30.

R ¹⁴¹～R¹⁵² which is not the single bond is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms.

Adjacent 2 selected from R ¹⁴¹～R¹⁵² other than the above single bond are not bonded to each other and thus do not form a ring structure. )

[ Chemical formula 6]

(In the formula (1 e),

*31 Is the bonding position to L ¹ or L ².

1 Selected from R ¹⁶¹～R¹⁶⁵ is a single bond to x 32 and another 1 selected from R ¹⁶¹～R¹⁶⁵ is a single bond to x 33.

R ¹⁶¹～R¹⁶⁵ which is not the single bond with the X32 or the single bond with the X33 is independently a hydrogen atom, an unsubstituted alkyl group with 1-10 carbon atoms or an unsubstituted phenyl group.

Adjacent 2 of R ¹⁶¹～R¹⁶⁵ selected from a single bond not bonded to x 32 nor a single bond not bonded to x 33 are not bonded to each other and thus do not form a ring.

R ¹⁷¹～R¹⁷⁵ and R ¹⁸¹～R¹⁸⁵ are each independently a hydrogen atom or an unsubstituted alkyl group having 1 to 10 carbon atoms.

Adjacent 2 selected from R ¹⁷¹～R¹⁷⁵ may be bonded to each other to form 1 or more unsubstituted benzene rings, may not be bonded to each other to form a ring,

Adjacent 2 selected from R ¹⁸¹～R¹⁸⁵ may be bonded to each other to form 1 or more unsubstituted benzene rings, and may not be bonded to each other to form a ring. )

[ Chemical formula 7]

(In the formula (1 f),

*34 Is the bonding position to L ¹ or L ².

X is an oxygen atom, a sulfur atom or NR ^A.

1 Selected from R ¹⁹¹～R¹⁹⁸ and R ^A is a single bond to 35.

R ^A which is not the single bond is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms.

R ¹⁹¹～R¹⁹⁸ which is not the single bond is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 13 ring-forming carbon atoms.

Adjacent 2 selected from R ¹⁹¹～R¹⁹⁸ other than the above single bond may be bonded to each other to form 1 or more unsubstituted benzene rings, and may not be bonded to each other to form a ring. )

[ Chemical formula 8]

(In the formula (1 g),

*36 Is the bonding position with L ¹ or L ².

1 Selected from R ^B、R^C and R ²⁰¹～R²⁰⁸ is a single bond to 37.

RB and R ^C which are not the single bond are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 13 ring-forming carbon atoms.

RB and R ^C other than the single bond described above may be bonded to each other to form a substituted or unsubstituted ring.

R ²⁰¹～R²⁰⁸ which is not the single bond is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 13 ring-forming carbon atoms.

Adjacent 2 selected from R ²⁰¹～R²⁰⁸ which is not the above single bond are not bonded to each other and thus do not form a ring. ))

In another embodiment, the present invention provides a material for an organic EL element comprising the compound represented by the above formula (1).

In still another embodiment, the present invention provides an organic electroluminescent element comprising a cathode, an anode, and an organic layer between the cathode and the anode, the organic layer comprising a light-emitting layer, at least 1 layer of the organic layer comprising the compound represented by the above formula (1).

In still another aspect, the present invention provides an electronic device including the above-described organic electroluminescent element.

ADVANTAGEOUS EFFECTS OF INVENTION

The organic EL element containing the compound represented by the above formula (1) exhibits improved element performance.

Drawings

Fig. 1 is a schematic diagram showing an example of a layer structure of an organic EL element according to an embodiment of the present invention.

Fig. 2 is a schematic diagram showing another example of the layer structure of the organic EL element according to the embodiment of the present invention.

Fig. 3 is a schematic view showing still another example of the layer structure of the organic EL element according to the embodiment of the present invention.

Detailed Description

[ Definition ]

In the present specification, the hydrogen atom means to contain isotopes having different neutron numbers, namely protium (protium), deuterium (deuterium) and tritium (tritium).

In the present specification, in the chemical structural formula, the symbol such as "R" and the bondable position of "D" indicating deuterium atom are not explicitly shown, and are set to be bonded with hydrogen atom, i.e., protium atom, deuterium atom or tritium atom.

In the present specification, the number of ring-forming carbon refers to the number of carbon atoms among atoms constituting the ring itself of a compound having a structure in which atoms are bonded in a ring (for example, a monocyclic compound, a condensed cyclic compound, a bridged cyclic compound, a carbocyclic compound, and a heterocyclic compound). When the ring is substituted with a substituent, the carbon contained in the substituent is not included in the number of ring-forming carbons. The "number of ring-forming carbons" described below is set similarly unless otherwise indicated. For example, the number of ring-forming carbons of the benzene ring is 6, the number of ring-forming carbons of the naphthalene ring is 10, the number of ring-forming carbons of the pyridine ring is 5, and the number of ring-forming carbons of the furan ring is 4. In addition, for example, the ring-forming carbon number of 9, 9-diphenylfluorenyl is 13,9,9' -spirobifluorenyl and the ring-forming carbon number is 25.

In addition, when an alkyl group is substituted as a substituent on the benzene ring, for example, the carbon number of the alkyl group is not included in the ring-forming carbon number of the benzene ring. Therefore, the ring carbon number of the benzene ring substituted with the alkyl group is 6. In addition, when an alkyl group is substituted as a substituent on the naphthalene ring, the carbon number of the alkyl group is not included in the ring-forming carbon number of the naphthalene ring. Therefore, the number of ring-forming carbons of the naphthalene ring substituted with an alkyl group is 10.

In the present specification, the number of ring-forming atoms refers to the number of atoms constituting the ring itself of a compound (for example, a monocyclic compound, a condensed compound, a bridged compound, a carbocyclic compound, and a heterocyclic compound) having a structure in which atoms are bonded in a ring (for example, a single ring, a condensed ring, and a bridged ring). Atoms that do not constitute a ring (e.g., hydrogen atoms that terminate bonds to atoms that constitute a ring), and atoms that are contained in a substituent when the ring is substituted with a substituent are not included in the number of ring-forming atoms. The "number of ring-forming atoms" described below is set similarly unless otherwise indicated. For example, the number of ring-forming atoms of the pyridine ring is 6, the number of ring-forming atoms of the quinazoline ring is 10, and the number of ring-forming atoms of the furan ring is 5. For example, the number of hydrogen atoms bonded to the pyridine ring or atoms constituting the substituent is not included in the number of pyridine ring-forming atoms. Therefore, the number of ring-forming atoms of the pyridine ring to which the hydrogen atom or the substituent is bonded is 6. In addition, for example, a hydrogen atom bonded to a carbon atom of a quinazoline ring or an atom constituting a substituent is not included in the number of ring-forming atoms of the quinazoline ring. Accordingly, the number of ring-forming atoms of the quinazoline ring to which a hydrogen atom or a substituent is bonded is 10.

In the present specification, "carbon number XX to YY" in the expression of "a substituted or unsubstituted ZZ group having carbon number XX to YY" means the carbon number when the ZZ group is unsubstituted, and the carbon number of the substituent when the substituent is substituted is not included. Here, "YY" is larger than "XX", where "XX" means an integer of 1 or more, and "YY" means an integer of 2 or more.

In the present specification, "atomic numbers XX to YY" in the expression of "a ZZ group of atomic numbers XX to YY that are substituted or unsubstituted" means the atomic number when the ZZ group is unsubstituted, and the atomic number of a substituent when substitution occurs is not included. Here, "YY" is larger than "XX", where "XX" means an integer of 1 or more, and "YY" means an integer of 2 or more.

In the present specification, an unsubstituted ZZ group means that "a substituted or unsubstituted ZZ group" is an "unsubstituted ZZ group", and a substituted ZZ group means that "a substituted or unsubstituted ZZ group" is a "substituted ZZ group".

In the present specification, "unsubstituted" when expressed as "substituted or unsubstituted ZZ group" means that the hydrogen atom in the ZZ group is not substituted with a substituent. The hydrogen atom in the "unsubstituted ZZ group" is a protium atom, deuterium atom or tritium atom.

In the present specification, "substitution" when referring to "substituted or unsubstituted ZZ group" means that 1 or more hydrogen atoms in the ZZ group are replaced with substituents. The term "substitution" when referring to "BB group substituted with AA group" means that 1 or more hydrogen atoms in BB group are replaced with AA group.

"Substituent described in the present specification") "

Substituents described in the present specification are described below.

The number of ring-forming carbon atoms of the "unsubstituted aryl group" described in the present specification is 6 to 50, preferably 6 to 30, more preferably 6 to 18, unless otherwise described in the present specification.

The number of ring-forming atoms of the "unsubstituted heterocyclic group" described in the present specification is 5 to 50, preferably 5 to 30, more preferably 5 to 18, unless otherwise described in the present specification.

The carbon number of the "unsubstituted alkyl group" described in the present specification is 1 to 50, preferably 1 to 20, more preferably 1 to 6, unless otherwise described in the present specification.

The carbon number of the "unsubstituted alkenyl group" described in the present specification is 2 to 50, preferably 2 to 20, more preferably 2 to 6, unless otherwise described in the present specification.

The carbon number of the "unsubstituted alkynyl" described in the present specification is 2 to 50, preferably 2 to 20, more preferably 2 to 6, unless otherwise described in the present specification.

The number of ring-forming carbon atoms of the "unsubstituted cycloalkyl group" described in the present specification is 3 to 50, preferably 3 to 20, more preferably 3 to 6, unless otherwise described in the present specification.

The number of ring-forming carbon atoms of the "unsubstituted arylene group" described in the present specification is 6 to 50, preferably 6 to 30, more preferably 6 to 18, unless otherwise described in the present specification.

The number of ring-forming atoms of the "unsubstituted divalent heterocyclic group" described in the present specification is 5 to 50, preferably 5 to 30, more preferably 5 to 18, unless otherwise described in the present specification.

The carbon number of the "unsubstituted alkylene group" described in the present specification is 1 to 50, preferably 1 to 20, more preferably 1 to 6, unless otherwise described in the present specification.

"Substituted or unsubstituted aryl"

Specific examples of the "substituted or unsubstituted aryl group" described in the present specification (specific example group G1) include the following unsubstituted aryl group (specific example group G1A) and substituted aryl group (specific example group G1B). (herein, unsubstituted aryl means that "substituted or unsubstituted aryl" is "unsubstituted aryl", and substituted aryl means that "substituted or unsubstituted aryl" is "substituted aryl"), and in this specification, only "aryl" is referred to, both "unsubstituted aryl" and "substituted aryl" are included.

"Substituted aryl" refers to a group in which 1 or more hydrogen atoms of an "unsubstituted aryl" are replaced with a substituent. Examples of the "substituted aryl" include a group obtained by replacing 1 or more hydrogen atoms of the "unsubstituted aryl" of the following specific example group G1A with substituents, and a substituted aryl of the following specific example group G1B. The examples of "unsubstituted aryl" and "substituted aryl" listed herein are only examples, and the "substituted aryl" described in the present specification also includes a group in which a hydrogen atom bonded to a carbon atom of an aryl group itself in the "substituted aryl" of the following specific example group G1B is further substituted with a substituent, and a group in which a hydrogen atom of a substituent in the "substituted aryl" of the following specific example group G1B is further substituted with a substituent.

Unsubstituted aryl (specific example group G1A):

phenyl group,

P-biphenyl group,

M-biphenyl group,

O-biphenyl group,

P-terphenyl-4-yl,

Para-terphenyl-3-yl,

Para-terphenyl-2-yl,

M-terphenyl-4-yl,

M-terphenyl-3-yl,

M-terphenyl-2-yl,

O-terphenyl-4-yl,

O-terphenyl-3-yl,

O-terphenyl-2-yl,

1-Naphthyl group,

2-Naphthyl group,

Anthracenyl group,

Benzoanthryl radical,

Phenanthryl group,

Benzophenanthryl radical,

Phenalkenyl group,

Pyrenyl group,

A base group,

Benzo (E) benzo (EA base group,

Triphenylene group,

Benzotriphenylene radical,

And tetraphenyl group,

Pentacenyl,

Fluorenyl group,

9,9' -Spirobifluorenyl,

Benzofluorenyl group,

Dibenzofluorenyl group,

Fluorescent anthracyl group,

Benzofluoranthenyl group,

Perylene groups

Monovalent aromatic groups derived by removing 1 hydrogen atom from a ring structure represented by the following general formulae (TEMP-1) to (TEMP-15).

[ Chemical formula 9]

[ Chemical formula 10]

Substituted aryl (group G1B) o-tolyl group,

M-tolyl group,

P-tolyl group,

P-xylyl radical,

M-xylyl radical,

O-xylyl radical,

P-isopropylphenyl group,

M-isopropylphenyl group,

O-isopropylphenyl group,

P-tert-butylphenyl group,

M-tert-butylphenyl group,

O-tert-butylphenyl group,

3,4, 5-Trimethylphenyl group,

9, 9-Dimethylfluorenyl group,

9, 9-Diphenylfluorenyl

9, 9-Bis (4-methylphenyl) fluorenyl,

9, 9-Bis (4-isopropylphenyl) fluorenyl,

9, 9-Bis (4-t-butylphenyl) fluorenyl,

Cyanophenyl group,

Triphenylsilylphenyl radical,

Trimethylsilylphenyl group,

Phenyl naphthyl group,

Naphthylphenyl group

A monovalent group derived from a ring structure represented by the general formulae (TEMP-1) to (TEMP-15) wherein 1 or more hydrogen atoms and substituents are substituted.

"Substituted or unsubstituted heterocyclyl"

The "heterocyclic group" described in the present specification is a cyclic group containing at least 1 hetero atom in the ring-forming atom. Specific examples of the hetero atom include a nitrogen atom, an oxygen atom, a sulfur atom, a silicon atom, a phosphorus atom and a boron atom.

The "heterocyclic group" described in this specification is a monocyclic group or a condensed ring group.

The "heterocyclic group" described in the present specification is an aromatic heterocyclic group or a non-aromatic heterocyclic group.

Specific examples of the "substituted or unsubstituted heterocyclic group" described in the present specification (specific example group G2) include the following unsubstituted heterocyclic group (specific example group G2A) and substituted heterocyclic group (specific example group G2B). (herein, the unsubstituted heterocyclic group means a case where the "substituted or unsubstituted heterocyclic group" is an "unsubstituted heterocyclic group", and the substituted heterocyclic group means a case where the "substituted or unsubstituted heterocyclic group" is a "substituted heterocyclic group"). In this specification, only the "heterocyclic group" is expressed to include both the "unsubstituted heterocyclic group" and the "substituted heterocyclic group".

"Substituted heterocyclic group" means a group in which 1 or more hydrogen atoms of an "unsubstituted heterocyclic group" are replaced with a substituent. Specific examples of the "substituted heterocyclic group" include a group in which a hydrogen atom of the "unsubstituted heterocyclic group" of the following specific example group G2A is substituted, and examples of the substituted heterocyclic group of the following specific example group G2B. Examples of the "unsubstituted heterocyclic group" and examples of the "substituted heterocyclic group" mentioned herein are only examples, and the "substituted heterocyclic group" described in the present specification includes a group in which a hydrogen atom bonded to a ring-forming atom of the heterocyclic group itself in the "substituted heterocyclic group" of the specific example group G2B is further substituted with a substituent, and a group in which a hydrogen atom of the substituent in the "substituted heterocyclic group" of the specific example group G2B is further substituted with a substituent.

Specific examples of the group G2A include, for example, the following unsubstituted heterocyclic group containing a nitrogen atom (example group G2A 1), an unsubstituted heterocyclic group containing an oxygen atom (example group G2A 2), an unsubstituted heterocyclic group containing a sulfur atom (example group G2A 3), and a monovalent heterocyclic group derived by removing 1 hydrogen atom from a ring structure represented by the following general formulae (TEMP-16) to (TEMP-33) (example group G2A 4).

Specific examples of the group G2B include, for example, the following substituted heterocyclic group containing a nitrogen atom (specific example group G2B 1), substituted heterocyclic group containing an oxygen atom (specific example group G2B 2), substituted heterocyclic group containing a sulfur atom (specific example group G2B 3), and a monovalent heterocyclic group derived from a ring structure represented by the following general formulae (TEMP-16) to (TEMP-33) in which 1 or more hydrogen atoms and substituents have been replaced (specific example group G2B 4).

Unsubstituted heterocyclyl containing a nitrogen atom (specific example group G2 A1):

Pyrrole group,

Imidazolyl group,

Pyrazolyl radical,

Triazolyl radical,

Tetrazolyl group,

Oxazolyl, isoxazolyl, oxadiazolyl, thiazolyl, isothiazolyl, thiadiazolyl, pyridinyl, pyridazinyl, pyrimidinyl, pyrazinyl, triazinyl, indolyl, isoindolyl, indolizinyl, quinolizinyl, quinolinyl, and isoquinolinyl, cinnolinyl, phthalazinyl, quinazolinyl, quinoxalinyl, benzimidazolyl, indazolyl, phenanthroline yl phenanthridinyl, acridinyl, phenazinyl, carbazolyl, benzocarbazolyl, morpholinyl, phenoxazinyl,

Phenothiazinyl group,

Azacarbazolyl group and diazacarbazolyl.

Unsubstituted heterocyclic group containing oxygen atom (concrete example group G2A 2): furyl group,

Oxazolyl group,

Isoxazolyl radical,

Oxadiazolyl group,

Xanthyl group,

Benzofuranyl group,

Isobenzofuranyl group,

Dibenzofuranyl group,

Naphthobenzofuranyl group,

Benzoxazolyl group,

Benzisoxazolyl group,

Phenoxazinyl group,

Morpholinyl group,

Dinaphthofuranyl group,

Azadibenzofuranyl radical,

Diazadibenzofuranyl radical,

Azanaphthobenzofuranyl groups

Naphthyridobenzofuranyl.

Unsubstituted heterocyclic group containing sulfur atom (concrete example group G2A 3) thienyl group,

Thiazolyl group,

Isothiazolyl group,

Thiadiazolyl group,

Benzothienyl (benzothienyl),

Isobenzothienyl (isobenzothienyl), dibenzothiophene (dibenzothienyl),

Naphthacene thienyl (naphthobenzothienyl),

Benzothiazolyl group,

Benzisothiazolyl group,

Phenothiazinyl group,

Dinaphthiophene radical (dinaphthothienyl),

Azadibenzo-p thienyl (azadibenzothienyl),

Diazadibenzo-based compounds thienyl (diazadibenzothienyl),

Azanaphthobenzo thienyl (azanaphthobenzothienyl)

Naphthyridine benzofurans and thienyl (diazanaphthobenzothienyl).

Monovalent heterocyclic groups derived by removing 1 hydrogen atom from the ring structure represented by the following general formulae (TEMP-16) to (TEMP-33) (concrete example group G2A 4):

[ chemical formula 11]

[ Chemical formula 12]

In the above general formulae (TEMP-16) to (TEMP-33), X _A and Y _A are each independently an oxygen atom, a sulfur atom, NH or CH ₂. Wherein at least 1 of X _A and Y _A is an oxygen atom, a sulfur atom or NH.

In the general formulae (TEMP-16) to (TEMP-33), when at least one of X _A and Y _A is NH or CH ₂, the monovalent heterocyclic group derived from the ring structure represented by the general formulae (TEMP-16) to (TEMP-33) includes a monovalent group obtained by removing 1 hydrogen atom from the NH or CH ₂.

Substituted heterocyclyl containing a nitrogen atom (specific example group G2B 1):

(9-phenyl) carbazolyl group,

(9-Biphenylyl) carbazolyl group,

(9-Phenyl) phenylcarbazolyl group,

(9-Naphthyl) carbazolyl group,

Diphenylcarbazol-9-yl,

Phenylcarbazol-9-yl,

Methyl benzimidazolyl group,

Ethylbenzimidazolyl group,

Phenyl triazinyl radical,

Biphenyl triazinyl radical,

Diphenyl triazinyl radical,

Phenyl quinazolinyl

Biphenylquinazolinyl.

Substituted heterocyclyl containing an oxygen atom (specific example group G2B 2):

Phenyl dibenzofuranyl group,

Methyl dibenzofuranyl group,

Tert-butyldibenzofuranyl group

Monovalent residues of spiro [ 9H-xanthene-9, 9' - [9H ] fluorene ].

Substituted heterocyclyl containing a sulfur atom (specific example group G2B 3):

phenyl dibenzothienyl,

Methyl dibenzothienyl,

Tert-butyldibenzothienyl and

Monovalent residues of spiro [ 9H-thioxanthene-9, 9' - [9H ] fluorene ].

A monovalent heterocyclic group derived from the ring structure represented by the general formulae (TEMP-16) to (TEMP-33) wherein 1 or more hydrogen atoms and substituents are substituted (concrete example group G2B 4):

The "1 or more hydrogen atoms of a monovalent heterocyclic group" means 1 or more hydrogen atoms selected from the group consisting of hydrogen atoms bonded to ring-forming carbon atoms of the monovalent heterocyclic group, hydrogen atoms bonded to nitrogen atoms when at least one of X _A and Y _A is NH, and hydrogen atoms of a methylene group when one of X _A and Y _A is CH ₂.

"Substituted or unsubstituted alkyl"

Specific examples of the "substituted or unsubstituted alkyl group" described in the present specification (specific example group G3) include the following unsubstituted alkyl group (specific example group G3A) and substituted alkyl group (specific example group G3B). (herein, unsubstituted alkyl means that "substituted or unsubstituted alkyl" is "unsubstituted alkyl", and substituted alkyl means that "substituted or unsubstituted alkyl" is "substituted alkyl") hereinafter, when only "alkyl" is expressed, both "unsubstituted alkyl" and "substituted alkyl" are included.

"Substituted alkyl" refers to a group in which 1 or more hydrogen atoms in the "unsubstituted alkyl" are replaced with a substituent. Specific examples of the "substituted alkyl" include the following "unsubstituted alkyl" (specific example group G3A), a group in which 1 or more hydrogen atoms and substituents have been replaced, and a substituted alkyl (specific example group G3B). In the present specification, an alkyl group in "unsubstituted alkyl group" means a chain-like alkyl group. Thus, "unsubstituted alkyl" includes "unsubstituted alkyl" as a straight chain and "unsubstituted alkyl" as a branched chain. The examples of "unsubstituted alkyl" and "substituted alkyl" mentioned herein are only examples, and the "substituted alkyl" described in the present specification includes a group in which a hydrogen atom of an alkyl group itself in the "substituted alkyl" of the specific example group G3B is further substituted with a substituent, and a group in which a hydrogen atom of a substituent in the "substituted alkyl" of the specific example group G3B is further substituted with a substituent.

Unsubstituted alkyl (specific example group G3A):

Methyl group,

Ethyl group,

N-propyl group,

Isopropyl group,

N-butyl group,

Isobutyl group,

Sec-butyl, and

And (3) tert-butyl.

Substituted alkyl (specific example group G3B):

Heptafluoropropyl (including isomers),

Pentafluoroethyl group,

2, 2-Trifluoroethyl group, and

Trifluoromethyl.

"Substituted or unsubstituted alkenyl"

Specific examples of the "substituted or unsubstituted alkenyl group" described in the present specification (specific example group G4) include the following unsubstituted alkenyl group (specific example group G4A) and substituted alkenyl group (specific example group G4B). (herein, unsubstituted alkenyl means that "substituted or unsubstituted alkenyl" is "unsubstituted alkenyl", and "substituted alkenyl" means that "substituted or unsubstituted alkenyl" is "substituted alkenyl"), and in this specification, only expression of "alkenyl" includes both "unsubstituted alkenyl" and "substituted alkenyl".

"Substituted alkenyl" refers to a group in which 1 or more hydrogen atoms in the "unsubstituted alkenyl" are replaced with a substituent. Specific examples of the "substituted alkenyl group" include the following "unsubstituted alkenyl group" (specific example group G4A) having a substituent, and examples of the substituted alkenyl group (specific example group G4B). The examples of "unsubstituted alkenyl" and "substituted alkenyl" listed herein are only examples, and the "substituted alkenyl" described in this specification includes a group in which a hydrogen atom of an alkenyl group itself in the "substituted alkenyl" of the specific example group G4B is further substituted with a substituent, and a group in which a hydrogen atom of a substituent in the "substituted alkenyl" of the specific example group G4B is further substituted with a substituent.

Unsubstituted alkenyl (specific example group G4A):

Vinyl group,

Allyl group,

1-Butenyl,

2-Butenyl

3-Butenyl.

Substituted alkenyl (specific example group G4B):

1, 3-butadienyl,

1-Methyl vinyl group,

1-Methylallyl,

1, 1-Dimethylallyl group,

2-Methylallyl

1, 2-Dimethylallyl.

"Substituted or unsubstituted alkynyl"

Specific examples of the "substituted or unsubstituted alkynyl group" described in the present specification (specific example group G5) include the following unsubstituted alkynyl group (specific example group G5A) and the like. (herein, unsubstituted alkynyl refers to the case where "substituted or unsubstituted alkynyl" is "unsubstituted alkynyl"), and when only "alkynyl" is described below, both "unsubstituted alkynyl" and "substituted alkynyl" are included.

"Substituted alkynyl" refers to a group in which 1 or more hydrogen atoms in "unsubstituted alkynyl" are replaced with substituents. Specific examples of the "substituted alkynyl" include an "unsubstituted alkynyl" described below (specific examples group G5A) in which 1 or more hydrogen atoms and substituents are replaced.

Unsubstituted alkynyl (concrete example group G5A):

Ethynyl group

"Substituted or unsubstituted cycloalkyl"

Specific examples of the "substituted or unsubstituted cycloalkyl group" described in the present specification (specific example group G6) include an unsubstituted cycloalkyl group (specific example group G6A) and a substituted cycloalkyl group (specific example group G6B) described below. (herein, unsubstituted cycloalkyl means that "substituted or unsubstituted cycloalkyl" is "unsubstituted cycloalkyl", and substituted cycloalkyl means that "substituted or unsubstituted cycloalkyl" is "substituted cycloalkyl"). In this specification, only "cycloalkyl" is expressed, and both "unsubstituted cycloalkyl" and "substituted cycloalkyl" are included.

"Substituted cycloalkyl" refers to a group in which 1 or more hydrogen atoms in the "unsubstituted cycloalkyl" have been replaced with a substituent. Specific examples of the "substituted cycloalkyl group" include an "unsubstituted cycloalkyl group" (specific example group G6A) in which 1 or more hydrogen atoms and substituents are replaced, and a substituted cycloalkyl group (specific example group G6B) described below. The examples of "unsubstituted cycloalkyl" and "substituted cycloalkyl" mentioned herein are only examples, and the term "substituted cycloalkyl" as used herein includes a group in which 1 or more hydrogen atoms bonded to the carbon atom of the cycloalkyl group itself in the "substituted cycloalkyl" of the specific example group G6B are replaced with a substituent, and a group in which the hydrogen atom of the substituent in the "substituted cycloalkyl" of the specific example group G6B is further replaced with a substituent.

Unsubstituted cycloalkyl (specific example group G6A):

Cyclopropyl group,

Cyclobutyl group,

Cyclopentyl group,

Cyclohexyl group,

1-Adamantyl group,

2-Adamantyl group,

1-Norbornyl group

2-Norbornyl.

Substituted cycloalkyl (specific example group G6B):

4-methylcyclohexyl.

Radicals "shown in" -Si (R ₉₀₁)(R₉₀₂)(R₉₀₃) "

Specific examples of the group represented by-Si (R ₉₀₁)(R₉₀₂)(R₉₀₃) described in the present specification (group G7) include

-Si(G1)(G1)(G1)、

-Si(G1)(G2)(G2)、

-Si(G1)(G1)(G2)、

-Si(G2)(G2)(G2)、

-Si (G3) (G3) (G3) and

Si (G6) (G6) (G6). Here the number of the elements is the number,

G1 is "substituted or unsubstituted aryl" as described in the concrete example group G1.

G2 is a "substituted or unsubstituted heterocyclic group" as described in the concrete example group G2.

G3 is "substituted or unsubstituted alkyl group" described in the concrete example group G3.

G6 is "substituted or unsubstituted cycloalkyl" as described in the concrete example group G6.

-A plurality of G1 in Si (G1) being the same or different from each other.

-A plurality of G2 of Si (G1) (G2) being the same or different from each other.

-A plurality of G1 s of Si (G1) (G2) being the same or different from each other.

-A plurality of G2 in Si (G2) being the same or different from each other.

-A plurality of G3 in Si (G3) being the same or different from each other.

-A plurality of G6 of Si (G6) being the same or different from each other.

Radical "-O- (R ₉₀₄)" as indicated "

Specific examples of the group represented by-O- (R ₉₀₄) described in the present specification (group G8) include

-O(G1)、

-O(G2)、

-O (G3) and

-O(G6)。

Here the number of the elements is the number,

"Group represented by S- (R ₉₀₅)":

Specific examples of the group represented by-S- (R ₉₀₅) described in the present specification (group G9) include

-S(G1)、

-S(G2)、

-S (G3) and

-S(G6)。

Here the number of the elements is the number,

"Group represented by N (R ₉₀₆)(R₉₀₇)":

Specific examples of the group represented by-N (R ₉₀₆)(R₉₀₇) described in the present specification (group G10) include

-N(G1)(G1)、

-N(G2)(G2)、

-N(G1)(G2)、

-N (G3) (G3) and

-N(G6)(G6)。

Here the number of the elements is the number,

-A plurality of G1 in N (G1) being the same or different from each other.

-A plurality of G2 in N (G2) being the same or different from each other.

-A plurality of G3 in N (G3) are the same or different from each other.

-A plurality of G6 in N (G6) being the same or different from each other.

"Halogen atom"

Specific examples of the "halogen atom" described in the present specification (specific example group G11) include a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, and the like.

"Substituted or unsubstituted fluoroalkyl"

The term "substituted or unsubstituted fluoroalkyl" as used herein refers to a group in which at least 1 hydrogen atom bonded to a carbon atom constituting an alkyl group in the term "substituted or unsubstituted alkyl group" is replaced with a fluorine atom, and includes a group (perfluoro group) in which all hydrogen atoms bonded to a carbon atom constituting an alkyl group in the term "substituted or unsubstituted alkyl group" are replaced with a fluorine atom. The carbon number of the "unsubstituted fluoroalkyl" is 1 to 50, preferably 1 to 30, more preferably 1 to 18, unless otherwise stated in the specification. "substituted fluoroalkyl" refers to a radical obtained by replacing 1 or more hydrogen atoms of "fluoroalkyl" with substituents. The term "substituted fluoroalkyl" as used herein includes a group in which 1 or more hydrogen atoms bonded to a carbon atom of an alkyl chain in the term "substituted fluoroalkyl" are further substituted with a substituent, and a group in which 1 or more hydrogen atoms of a substituent in the term "substituted fluoroalkyl" are further substituted with a substituent. Specific examples of the "unsubstituted fluoroalkyl group" include those obtained by replacing 1 or more hydrogen atoms and fluorine atoms in the "alkyl group" (specific example group G3).

"Substituted or unsubstituted haloalkyl"

The term "substituted or unsubstituted haloalkyl" as used herein refers to a group in which at least 1 hydrogen atom bonded to a carbon atom constituting an alkyl group in the term "substituted or unsubstituted alkyl" is replaced with a halogen atom, and includes a group in which all hydrogen atoms bonded to a carbon atom constituting an alkyl group in the term "substituted or unsubstituted alkyl" are replaced with a halogen atom. The carbon number of the "unsubstituted haloalkyl" is 1 to 50, preferably 1 to 30, more preferably 1 to 18, unless otherwise stated in the specification. "substituted haloalkyl" refers to a radical obtained by substituting 1 or more hydrogen atoms of "haloalkyl" with substituents. The term "substituted haloalkyl" as used herein also includes a group in which 1 or more hydrogen atoms bonded to a carbon atom of an alkyl chain in the term "substituted haloalkyl" are further substituted with a substituent, and a group in which 1 or more hydrogen atoms of a substituent in the term "substituted haloalkyl" are further substituted with a substituent. Specific examples of the "unsubstituted haloalkyl group" include those wherein 1 or more hydrogen atoms and halogen atoms in the above-mentioned "alkyl group" (specific example group G3) have been replaced. Haloalkyl is sometimes referred to as haloalkyl.

"Substituted or unsubstituted alkoxy"

Specific examples of the "substituted or unsubstituted alkoxy group" described in the present specification are groups represented by-O (G3), and G3 is a "substituted or unsubstituted alkyl group" described in the specific example group G3. The carbon number of the "unsubstituted alkoxy group" is 1 to 50, preferably 1 to 30, more preferably 1 to 18, unless otherwise stated in the present specification.

"Substituted or unsubstituted alkylthio"

Specific examples of the "substituted or unsubstituted alkylthio group" described in the present specification are groups represented by-S (G3), and G3 is a "substituted or unsubstituted alkyl group" described in the specific example group G3. The carbon number of the "unsubstituted alkylthio group" is 1 to 50, preferably 1 to 30, more preferably 1 to 18, unless otherwise stated in the specification.

"Substituted or unsubstituted aryloxy"

Specific examples of the "substituted or unsubstituted aryloxy group" described in the present specification are groups represented by-O (G1), and G1 is a "substituted or unsubstituted aryl group" described in the specific example group G1. The number of ring-forming carbon atoms of the "unsubstituted aryloxy group" is 6 to 50, preferably 6 to 30, more preferably 6 to 18, unless otherwise described in the specification.

"Substituted or unsubstituted arylthio"

Specific examples of the "substituted or unsubstituted arylthio group" described in the present specification are groups represented by-S (G1), and G1 is a "substituted or unsubstituted aryl group" described in the specific example group G1. The number of ring-forming carbon atoms of the "unsubstituted arylthio group" is 6 to 50, preferably 6 to 30, more preferably 6 to 18, unless otherwise stated in the specification.

"Substituted or unsubstituted trialkylsilyl"

Specific examples of the "trialkylsilyl group" described in the present specification are groups represented by-Si (G3) (G3) (G3), where G3 is a "substituted or unsubstituted alkyl group" described in the specific example group G3. -a plurality of G3 in Si (G3) being the same or different from each other. The carbon number of each alkyl group of the "trialkylsilyl" is 1 to 50, preferably 1 to 20, more preferably 1 to 6, unless otherwise stated in the specification.

"Substituted or unsubstituted aralkyl"

Specific examples of the "substituted or unsubstituted aralkyl group" described in the present specification are groups represented by- (G3) to (G1), where G3 is a "substituted or unsubstituted alkyl group" described in the specific example group G3, and G1 is a "substituted or unsubstituted aryl group" described in the specific example group G1. Accordingly, the "aralkyl" is a group obtained by replacing a hydrogen atom of the "alkyl" with the "aryl" as a substituent, and is one embodiment of the "substituted alkyl". The "unsubstituted aralkyl group" is an "unsubstituted alkyl group substituted with an" unsubstituted aryl group ", and the carbon number of the" unsubstituted aralkyl group "is 7 to 50, preferably 7 to 30, and more preferably 7 to 18, unless otherwise described in the present specification.

Specific examples of the "substituted or unsubstituted aralkyl group" include benzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, 2-phenylisopropyl, phenyltert-butyl, α -naphthylmethyl, 1- α -naphthylethyl, 2- α -naphthylethyl, 1- α -naphthylisopropyl, 2- α -naphthylisopropyl, β -naphthylmethyl, 1- β -naphthylethyl, 2- β -naphthylethyl, 1- β -naphthylisopropyl, and 2- β -naphthylisopropyl.

The substituted or unsubstituted aryl group described in the present specification is preferably phenyl, p-biphenyl, m-biphenyl, o-biphenyl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-terphenyl-4-yl, o-terphenyl-3-yl, o-terphenyl-2-yl, 1-naphthyl, 2-naphthyl, anthracenyl, phenanthryl, pyrenyl,Phenyl, triphenylenyl, fluorenyl, 9' -spirobifluorenyl, 9-dimethylfluorenyl, 9-diphenylfluorenyl, and the like.

The substituted or unsubstituted heterocyclic group described in the present specification is preferably pyridyl, pyrimidinyl, triazinyl, quinolinyl, isoquinolinyl, quinazolinyl, benzimidazolyl, phenanthrolinyl, carbazolyl (1-carbazolyl, 2-carbazolyl, 3-carbazolyl, 4-carbazolyl or 9-carbazolyl), benzocarbazolyl, azacarbazolyl, diazacarbazolyl, dibenzofuranyl, naphthobenzofuranyl, azadibenzofuranyl, diazadibenzofuranyl, dibenzothienyl, naphthobenzothienyl, azadibenzothienyl, (9-phenyl) carbazolyl ((9-phenyl) carbazol-1-yl, (9-phenyl) carbazol-2-yl, (9-phenyl) carbazol-3-yl or (9-phenyl) carbazol-4-yl), (9-phenyl) phenylcarbazolyl, diphenylcarbazolyl, phenylcarbazolyl, phenyltriazinyl, dibenzotriazinyl, dibenzofuranyl, etc., unless otherwise specified.

In the present specification, the carbazolyl group is specifically any of the following groups unless otherwise specified in the present specification.

[ Chemical formula 13]

In the present specification, (9-phenyl) carbazolyl is specifically any of the following unless otherwise specified in the present specification.

[ Chemical formula 14]

In the general formulas (TEMP-Cz 1) - (TEMP-Cz 9), the bonding position is represented by x.

In the present specification, dibenzofuranyl and dibenzothiophenyl are specifically any of the following unless otherwise specified in the present specification.

[ Chemical formula 15]

In the general formulae (TEMP-34) - (TEMP-41), the bonding position is represented.

The substituted or unsubstituted alkyl group described in the present specification is preferably methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, tert-butyl or the like unless otherwise specified in the present specification.

"Substituted or unsubstituted arylene"

The "substituted or unsubstituted arylene group" described in the present specification is a divalent group derived from the "substituted or unsubstituted aryl group" by removing 1 hydrogen atom from the aryl ring unless otherwise specified. Specific examples of the "substituted or unsubstituted arylene group" (concrete example group G12) include a divalent group derived from the "substituted or unsubstituted aryl group" described in concrete example group G1 by removing 1 hydrogen atom from the aryl ring.

"Substituted or unsubstituted divalent heterocyclic radical"

The "substituted or unsubstituted divalent heterocyclic group" described in the present specification is a divalent group derived from the above-mentioned "substituted or unsubstituted heterocyclic group" by removing 1 hydrogen atom from the heterocyclic ring unless otherwise specified. Specific examples of the "substituted or unsubstituted divalent heterocyclic group" (concrete example group G13) include a divalent group derived from the "substituted or unsubstituted heterocyclic group" described in concrete example group G2 by removing 1 hydrogen atom from the heterocycle.

"Substituted or unsubstituted alkylene"

The "substituted or unsubstituted alkylene group" described in the present specification is a divalent group derived by removing 1 hydrogen atom on the alkyl chain from the "substituted or unsubstituted alkyl group" unless otherwise specified. Specific examples of the "substituted or unsubstituted alkylene group" (concrete example group G14) include a divalent group derived from the "substituted or unsubstituted alkyl group" described in concrete example group G3 by removing 1 hydrogen atom from the alkyl chain.

The substituted or unsubstituted arylene group described in the present specification is preferably any one of the following general formulae (TEMP-42) to (TEMP-68) unless otherwise described in the present specification.

[ Chemical formula 16]

[ Chemical formula 17]

In the general formulae (TEMP-42) to (TEMP-52), Q ₁～Q₁₀ is independently a hydrogen atom or a substituent.

In the general formulae (TEMP-42) - (TEMP-52), the bonding position is represented.

[ Chemical formula 18]

In the general formulae (TEMP-53) to (TEMP-62), Q ₁～Q₁₀ is independently a hydrogen atom or a substituent.

Formulas Q ₉ and Q ₁₀ may be bonded to each other via a single bond to form a ring.

In the general formulae (TEMP-53) - (TEMP-62), the bonding position is represented.

[ Chemical formula 19]

In the general formulae (TEMP-63) to (TEMP-68), Q ₁～Q₈ is independently a hydrogen atom or a substituent.

In the general formulae (TEMP-63) - (TEMP-68), the bonding position is represented.

The substituted or unsubstituted divalent heterocyclic group described in the present specification is preferably any one of the following general formulae (TEMP-69) to (TEMP-102) unless otherwise described in the present specification.

[ Chemical formula 20]

[ Chemical formula 21]

[ Chemical formula 22]

In the general formulae (TEMP-69) - (TEMP-82), Q ₁～Q₉ each independently represents a hydrogen atom or a substituent.

[ Chemical formula 23]

[ Chemical formula 24]

[ Chemical formula 25]

[ Chemical formula 26]

In the general formulae (TEMP-83) - (TEMP-102), Q ₁～Q₈ are each independently a hydrogen atom or a substituent.

The above is a description of "substituents described in the present specification".

"Case of bonding to form a Ring"

In this specification, the expression "a case where 1 or more groups of 2 or more adjacent groups are bonded to each other to form a substituted or unsubstituted single ring, or are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other" refers to a case where 1 or more groups of 2 or more adjacent groups are bonded to each other to form a substituted or unsubstituted single ring, "a case where 1 or more groups of 2 or more adjacent groups are bonded to each other to form a substituted or unsubstituted condensed ring," and a case where 1 or more groups of 2 or more adjacent groups are not bonded to each other.

Hereinafter, a description will be given of a case where 1 or more groups of 2 or more adjacent groups are bonded to each other to form a substituted or unsubstituted single ring and a case where 1 or more groups of 2 or more adjacent groups are bonded to each other to form a substituted or unsubstituted condensed ring (hereinafter, these cases are sometimes referred to as "a case where bonding forms a ring"). The case of an anthracene compound represented by the following general formula (TEMP-103) having a parent skeleton as an anthracene ring will be described as an example.

[ Chemical formula 27]

For example, in the case where 1 or more groups of "adjacent 2 or more groups among R ₉₂₁～R₉₃₀ are bonded to each other to form a ring", the group of adjacent 2 groups of 1 means that the group of R ₉₂₁ and R ₉₂₂, the group of R ₉₂₂ and R ₉₂₃, A group of R ₉₂₃ and R ₉₂₄, a group of R ₉₂₄ and R ₉₃₀, a group of R ₉₃₀ and R ₉₂₅, A group of R ₉₂₅ and R ₉₂₆, a group of R ₉₂₆ and R ₉₂₇, a group of R ₉₂₇ and R ₉₂₈, A group of R ₉₂₈ and R ₉₂₉, and a group of R ₉₂₉ and R ₉₂₁.

The "1 or more groups" means that 2 or more groups of the adjacent 2 or more groups can simultaneously form a ring. For example, when R ₉₂₁ and R ₉₂₂ are bonded to each other to form a ring Q _A and simultaneously R ₉₂₅ and R ₉₂₆ are bonded to each other to form a ring Q _B, the anthracene compound represented by the above general formula (TEMP-103) is represented by the following general formula (TEMP-104).

[ Chemical formula 28]

The case where "a group of 2 or more adjacent groups" forms a ring includes not only the case where a group of 2 or more adjacent groups is bonded as in the foregoing example, but also the case where a group of 3 or more adjacent groups is bonded. For example, R ₉₂₁ and R ₉₂₂ are bonded to each other to form a ring Q _A, and R ₉₂₂ and R ₉₂₃ are bonded to each other to form a ring Q _C, and 3 groups (R ₉₂₁、R₉₂₂ and R ₉₂₃) adjacent to each other are bonded to each other to form a ring and condensed on an anthracene skeleton, and in this case, an anthracene compound represented by the general formula (TEMP-103) is represented by the following general formula (TEMP-105). In the following general formula (temp.105), ring Q _A and ring Q _C share R ₉₂₂.

[ Chemical formula 29]

In the "single ring" or "condensed ring" formed, the ring formed may have a saturated ring or an unsaturated ring as a structure of the ring itself. Even in the case where "1 group of adjacent 2 groups" forms a "single ring" or "condensed ring", the "single ring" or "condensed ring" may form a saturated ring or an unsaturated ring. For example, the ring Q _A and the ring Q _B formed in the above general formula (TEMP-104) are each a "single ring" or a "condensed ring". In addition, the ring Q _A and the ring Q _C formed in the above general formula (TEMP-105) are "condensed rings". The rings Q _A and Q _C of the general formula (TEMP-105) are fused to form a fused ring by the ring Q _A and the ring Q _C. If ring Q _A of the above general formula (TEMP-104) is a benzene ring, ring Q _A is a single ring. If the ring Q _A of the general formula (TEMP-104) is a naphthalene ring, the ring Q _A is a condensed ring.

"Unsaturated ring" refers to an aromatic hydrocarbon ring or an aromatic heterocycle. "saturated ring" refers to an aliphatic hydrocarbon ring or a non-aromatic heterocyclic ring.

Specific examples of the aromatic hydrocarbon ring include a structure in which a group specifically exemplified as group G1 is blocked with a hydrogen atom.

Specific examples of the aromatic heterocyclic ring include a structure in which an aromatic heterocyclic group specifically exemplified as group G2 is blocked with a hydrogen atom.

Specific examples of the aliphatic hydrocarbon ring include structures in which a group specifically exemplified as group G6 is blocked with a hydrogen atom.

"Forming a ring" means forming a ring from only multiple atoms of the parent skeleton or from multiple atoms of the parent skeleton with 1 or more additional optional elements. For example, the ring Q _A formed by bonding R ₉₂₁ and R ₉₂₂ shown by the general formula (TEMP-104) refers to a ring formed by the carbon atom of the anthracene skeleton bonded by R ₉₂₁ and the carbon atom of the anthracene skeleton bonded by R ₉₂₂ and 1 or more optional elements. Specifically, in the case where R ₉₂₁ and R ₉₂₂ form a ring Q _A, when a monocyclic unsaturated ring is formed by a carbon atom of an anthracene skeleton to which R ₉₂₁ is bonded, a carbon atom of an anthracene skeleton to which R ₉₂₂ is bonded, and 4 carbon atoms, the ring formed by R ₉₂₁ and R ₉₂₂ is a benzene ring.

Here, the "optional element" is preferably at least 1 element selected from the group consisting of a carbon element, a nitrogen element, an oxygen element, and a sulfur element unless otherwise described in the present specification. In the optional element (for example, in the case of a carbon element or a nitrogen element), the bond which does not form a ring may be blocked by a hydrogen atom or the like, or may be substituted by an "optional substituent" described later. When an optional element other than carbon is included, the ring formed is a heterocyclic ring.

If not otherwise described in the present specification, "1 or more optional elements" constituting a single ring or a condensed ring are preferably 2 or more and 15 or less, more preferably 3 or more and 12 or less, and still more preferably 3 or more and 5 or less.

In the present specification, unless otherwise stated, the term "monocyclic ring" and the term "condensed ring" are preferably "monocyclic ring".

In the present specification, unless otherwise stated, the "saturated ring" and the "unsaturated ring" are preferably "unsaturated ring".

In the present specification, unless otherwise stated, the "monocyclic ring" is preferably a benzene ring.

In the present specification, unless otherwise stated, the "unsaturated ring" is preferably a benzene ring.

In the case where "1 or more groups of 2 or more adjacent groups" are bonded to each other to form a substituted or unsubstituted single ring "or" are bonded to each other to form a substituted or unsubstituted condensed ring "unless otherwise described in the present specification, it is preferable that 1 or more groups of 2 or more adjacent groups are bonded to each other to form a substituted or unsubstituted" unsaturated ring "formed of a plurality of atoms of a parent skeleton and 1 or more and 15 or less elements selected from at least 1 element selected from the group consisting of carbon element, nitrogen element, oxygen element and sulfur element.

The substituent when the "single ring" or "condensed ring" has a substituent is, for example, an "optional substituent" described later. Specific examples of the substituent when the "single ring" or "condensed ring" has a substituent are the substituents described in the above item of "substituent described in the present specification".

The substituent when the "saturated ring" or "unsaturated ring" has a substituent is, for example, an "optional substituent" described later. Specific examples of the substituent when the "single ring" or "condensed ring" has a substituent are the substituents described in the above item of "substituent described in the present specification".

The above description is for the case of "a substituted or unsubstituted single ring is formed by bonding 1 or more groups of 2 or more adjacent groups" and the case of "a substituted or unsubstituted condensed ring is formed by bonding 1 or more groups of 2 or more adjacent groups" (the case of "a ring is formed by bonding").

Substituents when expressed as "substituted or unsubstituted

In one embodiment of the present specification, the substituent when expressed as "substituted or unsubstituted" (in the present specification, sometimes referred to as "optional substituent") is, for example, a substituent selected from the group consisting of

Unsubstituted alkyl group having 1 to 50 carbon atoms,

Unsubstituted alkenyl group having 2 to 50 carbon atoms,

Unsubstituted alkynyl with 2-50 carbon atoms,

Unsubstituted cycloalkyl having 3 to 50 ring-forming carbon atoms,

-Si(R₉₀₁)(R₉₀₂)(R₉₀₃)、

-O-(R₉₀₄)、

-S-(R₉₀₅)、

-N(R₉₀₆)(R₉₀₇)、

Halogen atom, cyano group, nitro group,

Unsubstituted aryl group having 6 to 50 ring carbon atoms, and

Unsubstituted heterocyclic group having 5 to 50 ring members

A group in the group consisting of, and the like,

Here, R ₉₀₁～R₉₀₇ are each independently

A hydrogen atom,

Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,

Substituted or unsubstituted cycloalkyl having 3 to 50 ring-forming carbon atoms,

Substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or

A substituted or unsubstituted heterocyclic group having 5 to 50 ring members.

In the case where R ₉₀₁ is present in an amount of 2 or more, 2 or more R ₉₀₁ are the same or different from each other,

In the case where R ₉₀₂ is present in an amount of 2 or more, 2 or more R ₉₀₂ are the same or different from each other,

In the case where R ₉₀₃ is present in an amount of 2 or more, 2 or more R ₉₀₃ are the same or different from each other,

In the case where R ₉₀₄ is present in an amount of 2 or more, 2 or more R ₉₀₄ are the same or different from each other,

In the case where R ₉₀₅ is present in an amount of 2 or more, 2 or more R ₉₀₅ are the same or different from each other,

In the case where R ₉₀₆ is present in an amount of 2 or more, 2 or more R ₉₀₆ are the same or different from each other,

In the case where there are 2 or more R ₉₀₇, 2 or more R ₉₀₇ are the same or different from each other.

In one embodiment, the substituents described above as "substituted or unsubstituted" are selected from the group consisting of

An alkyl group having 1 to 50 carbon atoms,

Aryl group having 6 to 50 ring carbon atoms, and

Heterocyclic group with ring-forming atom number of 5-50

Groups in the group consisting of.

An alkyl group having 1 to 18 carbon atoms,

Aryl groups having 6 to 18 ring-forming carbon atoms, and

Heterocyclic group with 5-18 ring atoms

Groups in the group consisting of.

Specific examples of the groups of the above-mentioned optional substituents are specific examples of the substituents described in the item of "substituents described in the present specification" above.

Unless otherwise indicated herein, adjacent optional substituents may form a "saturated ring" or an "unsaturated ring", and preferably form a substituted or unsubstituted saturated five-membered ring, a substituted or unsubstituted saturated six-membered ring, a substituted or unsubstituted unsaturated five-membered ring, or a substituted or unsubstituted unsaturated six-membered ring, and more preferably form a benzene ring.

The optional substituent may further have a substituent unless otherwise stated in the specification. The substituent further included as an optional substituent is the same as the above optional substituent.

In the present specification, the numerical range indicated by "AA to BB" means a range including the numerical value AA described in front of "AA to BB" as a lower limit value and the numerical value BB described in rear of "AA to BB" as an upper limit value.

The compounds of the present invention will be described below.

The compound of the present invention is represented by the above formula (1). The following description will be given of the symbols in the formulae (1) and (1) described below. Unless otherwise indicated, like reference numerals have the same meaning.

The compounds of the present invention represented by the following formulas contained in formulas (1) and (1) are sometimes referred to as "inventive compounds".

[ Chemical formula 30]

N is a central nitrogen atom.

One of R ^a and R ^b is a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, preferably 1 to 18 carbon atoms, more preferably 1 to 10 carbon atoms, still more preferably 1 to 6 carbon atoms, and the other is a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, preferably 6 to 25 carbon atoms, more preferably 6 to 12 carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 30 carbon atoms, preferably 5 to 18 carbon atoms, more preferably 5 to 13 carbon atoms.

In one embodiment of the present invention, it is preferable that one of R ^a and R ^b is a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms and the other is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, and it is more preferable that one of R ^a and R ^b is a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms and the other is a substituted or unsubstituted phenyl group.

The unsubstituted alkyl group having 1 to 30 carbon atoms represented by R ^a and R ^b is, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl or dodecyl, preferably methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl or pentyl, more preferably methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl or tert-butyl, still more preferably methyl or tert-butyl.

The unsubstituted aryl group having 6 to 30 ring-forming carbon atoms represented by R ^a and R ^b is, for example, phenyl, biphenyl, terphenyl, biphenylenyl, naphthyl, anthryl, benzanthracenyl, phenanthryl, benzophenanthryl, phenalenyl, alizarin, pentylphenyl, pyrenyl,Radical, benzoA phenyl group, a biphenyl group, a terphenyl group or a triphenylene group (TRIPHENYLENYL) is preferable, a phenyl group, a biphenyl group, a terphenyl group or a naphthalene group is more preferable, a phenyl group, a 2-biphenyl group, a 3-biphenyl group or a 4-biphenyl group, a 2-o-terphenyl group, a 3-o-terphenyl group or a 4-o-terphenyl group, a 2-m-terphenyl group, a 3-m-terphenyl group or a 4-m-terphenyl group, a 2-p-terphenyl group, a 3-p-terphenyl group or a 4-p-terphenyl group, or a 1-naphthyl group or a 2-naphthyl group is more preferable, a phenyl group, a 2-biphenyl group, a 3-biphenyl group or a 4-biphenyl group, or a 1-naphthyl group or a 2-naphthyl group is more preferable.

The unsubstituted aromatic heterocyclic group having 5 to 30 ring members represented by R ^a and R ^b is, for example, pyrrolyl, furyl, thienyl, pyridyl, imidazopyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, triazinyl, imidazolyl, oxazolyl, thiazolyl, pyrazolyl, isoxazolyl, isothiazolyl, oxadiazolyl, thiadiazolyl, triazolyl, tetrazolyl, indolyl, isoindolyl, indolizinyl, quinolizinyl, quinolinyl, isoquinolinyl, cinnolinyl, phthalazinyl, quinazolinyl, quinoxalinyl, benzimidazolyl, benzoxazolyl, benzothiazolyl, indazolyl, benzisoxazolyl, phenanthridinyl, acridinyl, phenanthrolinyl, phenazinyl, phenothiazinyl, phenoxazinyl, xanthenyl, benzofuranyl, isobenzofuranyl, naphthyzobenzofuranyl, dibenzofuranyl, benzothienyl (benzothienyl, the following is the same), isobenzothienyl (isobenzothienyl, the following is the same), naphthobenzothienyl (naphthobenzothienyl, the following is the same), dibenzothienyl (dibenzothienyl, the following is the same), or carbazolyl, preferably benzofuranyl, isobenzofuranyl, naphthobenzofuranyl, dibenzofuranyl, benzothienyl, isobenzothienyl, naphthobenzothienyl, dibenzothienyl or carbazolyl (9-carbazolyl, or 1-carbazolyl, 2-carbazolyl, 3-carbazolyl or 4-carbazolyl).

The unsubstituted monocyclic ring formed by the above-mentioned R ^a and R ^b is, for example, a benzene ring, a cyclopentane ring, a cyclohexane ring.

The unsubstituted condensed ring formed by the above-mentioned R ^a and R ^b is, for example, a naphthalene ring or an anthracene ring.

In addition, in the case where R ^a and R ^b are bonded to each other to form an unsubstituted single ring or an unsubstituted condensed ring, R ^a and R ^b may form a ring together with the fluorene skeleton to which these groups are bonded to form a spiro ring. The spiro ring is hydrocarbon ring or heterocycle, and is selected from monocyclic ring, condensed ring, double-ring bridged ring and tricyclic bridged ring. Examples of substituted or unsubstituted spiro rings are shown below, but are not limited thereto. * Represents the bonding position of the benzene ring with the fluorene skeleton.

[ Chemical formula 31]

In one embodiment of the invention, R ^a and R ^b are preferably not bonded to each other to form a substituted or unsubstituted ring.

1 Selected from R ²、R³、R⁶ and R ⁷ is a single bond bonded to 1, R ¹、R⁴、R⁵、R⁸ and R ²、R³、R⁶ and R ⁷ which are not single bonds bonded to 1 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, preferably 1 to 18 carbon atoms, more preferably 1 to 10 carbon atoms, still more preferably 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 15 carbon atoms, preferably 3 to 10 carbon atoms, more preferably 3 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 13 carbon atoms.

In one embodiment of the present invention, R ² or R ⁷ is preferably a single bond to x 1.

Details of the unsubstituted alkyl group having 1 to 30 carbon atoms represented by R ¹、R⁴、R⁵、R⁸ and R ²、R³、R⁶ and R ⁷ which are not single bonds bonded to 1 are the same as those described for R ^a and R ^b.

The unsubstituted cycloalkyl group having 3 to 15 ring-forming carbon atoms represented by R ¹、R⁴、R⁵、R⁸ and R ²、R³、R⁶ and R ⁷ which are not single bonds bonded to 1 are, for example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl or cyclooctyl, preferably cyclopropyl, cyclobutyl, cyclopentyl or cyclohexyl.

The details of the unsubstituted aryl group having 6 to 12 ring-forming carbon atoms represented by R ¹、R⁴、R⁵、R⁸ and R ²、R³、R⁶ and R ⁷ which are not single bonds bonded to 1 are the same as those described for R ^a and R ^b except that the number of ring-forming carbon atoms is 6 to 12.

The details of the heterocyclic group having 5 to 13 unsubstituted ring-forming atoms represented by R ¹、R⁴、R⁵、R⁸ and R ²、R³、R⁶ and R ⁷ which are not single bonds bonded to 1 are the same as those described for R ^a and R ^b except that the number of ring-forming atoms is 5 to 13.

R ¹、R⁴、R⁵、R⁸, R ²、R³、R⁶ and R ⁷ which are not single bonds to 1 may be each a hydrogen atom.

R ¹¹～R¹⁴ is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, preferably 1 to 18 carbon atoms, more preferably 1 to 10 carbon atoms, still more preferably 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, preferably 6 to 12 carbon atoms.

Details of the unsubstituted alkyl group having 1 to 30 carbon atoms represented by R ¹¹～R¹⁴ are the same as those described for R ^a and R ^b.

The details of the unsubstituted aryl group having 6 to 18 ring-forming carbon atoms represented by R ¹¹～R¹⁴ are the same as those described for R ^a and R ^b except that the ring-forming carbon number is 6 to 18.

R ¹¹～R¹⁴ may be a hydrogen atom.

L ¹～L⁴ is independently a single bond or arylene having 6 to 30, preferably 6 to 25, more preferably 6 to 12 ring-forming carbon atoms.

In one embodiment of the present invention, L ¹ and L ² are each independently preferably a single bond or an arylene group having 6 to 12 ring-forming carbon atoms.

L ¹ may be a single bond and L ² may be a single bond.

In one embodiment of the invention, L ³ is preferably a single bond.

In addition, in one embodiment of the present invention, L ⁴ is preferably a single bond.

In addition, in one embodiment of the present invention, L ³ and L ⁴ are preferably single bonds.

The unsubstituted arylene group having 6 to 30 ring-forming carbon atoms represented by L ¹～L⁴ is a divalent group obtained by removing 1 hydrogen atom from an unsubstituted aryl group having 6 to 30 ring-forming carbon atoms. Details of the unsubstituted aryl group having 6 to 30 ring-forming carbon atoms are the same as those described for R ^a and R ^b.

[ Chemical formula 32]

In the formula (1 a), the amino acid sequence of the formula (1 a),

*21 Is a bonding position with L ¹ or L ².

When L ¹ is a single bond, 21 as a group of formula (1 a) of Ar ¹ represents a bonding position with a central nitrogen atom N,

When L ² is a single bond, the group represented by formula (1 a) as Ar ² represents a bonding position to the central nitrogen atom N.

The details of the unsubstituted alkyl group having 1 to 10 carbon atoms represented by R ¹⁰¹～R¹¹⁵ other than the single bond are the same as those described for R ^a and R ^b except that the carbon number is 1 to 10.

The details of the unsubstituted aryl group having 6 to 12 ring-forming carbon atoms represented by R ¹⁰¹～R¹¹⁵ are the same as those described for R ^a and R ^b except that the ring-forming carbon number is 6 to 12.

R ¹⁰¹～R¹⁰⁵ that are not single bonds to x 22 may each be a hydrogen atom, R ¹⁰⁶～R¹¹⁰ that are not single bonds to x 23 may each be a hydrogen atom, and R ¹¹¹～R¹¹⁵ that are not single bonds to x 24 may each be a hydrogen atom.

M is 0 or 1, n is 0 or 1, and 1 is 0 or 1.

When m is 0, n is 1 and 1 is 0 or 1, x 22 represents a bonding position with L ¹ or L ² (×22 represents x 21), when m is 0, n is 0 and 1, x 23 represents a bonding position with L ¹ or L ² (×23 represents x 21), when m is 0, n is 0 and 1 is 0, x 24 represents a bonding position with L ¹ or L ² (×24 represents x 21).

In one embodiment of the invention, m is 0, n is 0, and 1 is 0. In this case, 24 denotes 21, and formula (1 a) is represented by the following formula.

[ Chemical formula 33]

In another embodiment of the present invention, m is 1, n is 0, and 1 is 0. In this case, 24 denotes 22, and formula (1 a) is represented by the following formula.

[ Chemical formula 34]

In yet another embodiment of the present invention, m is 0, n is 1, and 1 is 0. In this case, 22 denotes 21, 24 denotes 23, and formula (1 a) is represented by the following formula.

[ Chemical formula 35]

In yet another embodiment of the present invention, m is 0, n is 0, and 1 is 1. In this case, 23 denotes 21, and formula (1 a) is represented by the following formula.

[ Chemical formula 36]

In yet another embodiment of the present invention, m is 1, n is 1, and 1 is 0. In this case, 24 denotes 23, and formula (1 a) is represented by the following formula.

[ Chemical formula 37]

In yet another embodiment of the present invention, m is 1, n is 0, and 1 is 1. In this case, 23 denotes 22, and formula (1 a) is represented by the following formula.

[ Chemical formula 38]

In yet another embodiment of the present invention, m is 0, n is 1, and 1 is 1. In this case, x 22 represents x 21, and formula (1 a) is represented by the following formula.

[ Chemical formula 39]

In yet another embodiment of the present invention, m is 1, n is 1, and 1 is 1. In this case, the formula (1 a) is represented by the following formula.

[ Chemical formula 40]

Preferably, the group represented by the above formula (1 a) satisfies at least 1 of the following items (i) to (iii).

(I) R ¹⁰¹ or R ¹⁰⁵ is a single bond to 22

(Ii) R ¹⁰⁶ or R ¹¹⁰ is a single bond to 23

(Iii) R ¹¹¹ or R ¹¹⁵ is a single bond to 24

Adjacent 2 selected from R ¹¹⁶～R¹²⁰ are not bonded to each other and thus do not form a ring.

Details of the unsubstituted alkyl group having 1 to 10 carbon atoms represented by R ¹¹⁶～R¹²⁰ are the same as those described for R ^a and R ^b except that the carbon number is 1 to 10.

The details of the unsubstituted aryl group having 6 to 12 ring-forming carbon atoms represented by R ¹¹⁶～R¹²⁰ are the same as those described for R ^a and R ^b except that the ring-forming carbon number is 6 to 12.

The details of the unsubstituted aryl group having 5 to 13 ring-forming carbon atoms represented by R ¹¹⁶～R¹²⁰ are the same as those described for R ^a and R ^b except that the number of ring-forming atoms is 5 to 13.

R ¹¹⁶～R¹²⁰ may be a hydrogen atom.

The group represented by formula (1 a) is preferably represented by the following formula. In the following formula, R is omitted for simplicity.

[ Chemical formula 41]

The formula (1 b) is represented by the following formula.

[ Chemical formula 42]

In the formula (1 b), the amino acid sequence,

*25 Is the bonding position with L ¹ or L ².

1 Selected from R ¹²¹～R¹²⁸ is a single bond to x 26.

R ¹²¹～R¹²⁸ other than the above single bond is each independently a hydrogen atom, an unsubstituted alkyl group having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, or an unsubstituted aryl group having 6 to 12 ring-forming carbon atoms.

When L ² is p-phenylene and Ar ² is represented by formula (1 b), 1 of the groups represented by formula (1 b) bonded to the p-phenylene is a single bond bonded to x 26 selected from R ¹²¹、R¹²⁴、R¹²⁵ and R ¹²⁸.

When L ¹ is a single bond, 25 as a group of formula (1 b) of Ar ¹ represents a bonding position to the central nitrogen atom N,

When L ² is a single bond, 25 which is a group represented by formula (1 b) of Ar ² represents a bonding position to the central nitrogen atom N.

Details of the unsubstituted alkyl group having 1 to 10 carbon atoms represented by R ¹²¹～R¹²⁸ are the same as those described for R ^a and R ^b except that the carbon number is 1 to 10.

The details of the unsubstituted aryl group having 6 to 12 ring-forming carbon atoms represented by R ¹²¹～R¹²⁸ are the same as those described for R ^a and R ^b except that the ring-forming carbon number is 6 to 12.

In one embodiment of the invention, R ¹²¹ is preferably a single bond to x 26, and in another embodiment R ¹²² is preferably a single bond to x 26.

R ¹²¹～R¹²⁸, which are not single bonds to x 26, may each be a hydrogen atom.

The formula (1 c) is represented by the following formula.

[ Chemical formula 43]

In the formula (1 c), the amino acid sequence,

*27 Is the bonding position to L ¹ or L ².

1 Selected from R ¹³¹～R¹⁴⁰ is a single bond to x 28.

R ¹³¹～R¹⁴⁰ other than the above single bond is each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms.

Adjacent 2 selected from R ¹³¹～R¹⁴⁰ which is not the above single bond are not bonded to each other and thus do not form a ring.

When L ¹ is a single bond, 27 as a group of formula (1 c) of Ar ¹ represents a bonding position to the central nitrogen atom N,

When L ² is a single bond, 27, which is a group represented by formula (1 c) of Ar ², represents a bonding position to the central nitrogen atom N.

Details of the unsubstituted alkyl group having 1 to 6 carbon atoms represented by R ¹³¹～R¹⁴⁰ are the same as those described for R ^a and R ^b except that the carbon number is 1 to 6.

The details of the unsubstituted aryl group having 6 to 12 ring-forming carbon atoms represented by R ¹³¹～R¹⁴⁰ are the same as those described for R ^a and R ^b except that the ring-forming carbon number is 6 to 12.

In one embodiment of the invention, R ¹³¹ is preferably a single bond to x 28, in another embodiment R ¹³² is preferably a single bond to x 28, in another embodiment R ¹⁴⁰ is preferably a single bond to x 28.

R ¹³¹～R¹⁴⁰, which are not single bonds to x 28, may each be a hydrogen atom.

The formula (1 d) is represented by the following formula.

[ Chemical formula 44]

In the formula (1 d), the amino acid sequence of the compound,

*29 Is the bonding position with L ¹ or L ².

1 Selected from R ¹⁴¹～R¹⁵² is a single bond to x 30.

R ¹⁴¹～R¹⁵² other than the above single bond is each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms.

Adjacent 2 selected from R ¹⁴¹～R¹⁵² other than the above single bond are not bonded to each other and thus do not form a ring structure.

When L ¹ is a single bond, the group represented by formula (1 d) as Ar ¹ represents a bonding position to the central nitrogen atom N,

When L ² is a single bond, the group represented by formula (1 d) as Ar ² represents a bonding position to the central nitrogen atom N.

Details of the unsubstituted alkyl group having 1 to 10 carbon atoms represented by R ¹⁴¹～R¹⁵² are the same as those described for R ^a and R ^b except that the carbon number is 1 to 10.

The details of the unsubstituted aryl group having 6 to 12 ring-forming carbon atoms represented by R ¹⁴¹～R¹⁵² are the same as those described for R ^a and R ^b except that the ring-forming carbon number is 6 to 12.

R ¹⁴¹～R¹⁵², which are not single bonds to x 30, may each be a hydrogen atom.

The formula (1 e) is represented by the following formula.

[ Chemical formula 45]

In the formula (1 e), the amino acid sequence of the compound,

*31 Is the bonding position to L ¹ or L ².

R ¹⁶¹～R¹⁶⁵, which is not the single bond with the bond 32 or the single bond with the bond 33, is independently a hydrogen atom, an unsubstituted alkyl group having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, or an unsubstituted phenyl group.

When L ¹ is a single bond, 31 as a group of formula (1 e) of Ar ¹ represents a bonding position to the central nitrogen atom N,

When L ² is a single bond, 31 which is a group represented by formula (1 e) of Ar ² represents a bonding position to the central nitrogen atom N.

Details of the unsubstituted alkyl group having 1 to 10 carbon atoms represented by R ¹⁶¹～R¹⁶⁵ which is not the single bond bonded to x 32 or the single bond bonded to x 33 are the same as those described for R ^a and R ^b except that the carbon number is 1 to 10.

R ¹⁶¹～R¹⁶⁵, which is not a single bond to x 32 or a single bond to x 33, may be a hydrogen atom.

R ¹⁷¹～R¹⁷⁵ and R ¹⁸¹～R¹⁸⁵ are each independently a hydrogen atom or an unsubstituted alkyl group having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms.

Adjacent 2 selected from R ¹⁸¹～R¹⁸⁵ may be bonded to each other to form 1 or more unsubstituted benzene rings, and may not be bonded to each other to form a ring.

Details of the unsubstituted alkyl group having 1 to 10 carbon atoms represented by R ¹⁷¹～R¹⁷⁵ and R ¹⁸¹～R¹⁸⁵ are the same as those described for R ^a and R ^b except that the carbon number is 1 to 10.

R ¹⁷¹～R¹⁷⁵ and R ¹⁸¹～R¹⁸⁵ may each be a hydrogen atom.

The formula (1 e) includes groups represented by the following formulas (1 e-1) to (1 e-5), preferably the formula (1 e-1), (1 e-2) or (1 e-4).

[ Chemical formula 46]

The formula (1 f) is represented by the following formula.

[ Chemical formula 47]

In the formula (1 f), the amino acid sequence,

*34 Is the bonding position to L ¹ or L ².

X is an oxygen atom, a sulfur atom or NR ^A.

X is preferably an oxygen atom or NR ^A.

1 Selected from R ¹⁹¹～R¹⁹⁸ and R ^A is a single bond to 35.

When L ¹ is a single bond, 34 as a group of formula (1 f) of Ar ¹ represents a bonding position to the central nitrogen atom N,

When L ² is a single bond, 34 as a group of formula (1 f) of Ar ² represents a bonding position to the central nitrogen atom N.

Details of the unsubstituted alkyl group having 1 to 6 carbon atoms represented by R ^A are the same as those described for R ^a and R ^b except that the carbon number is 1 to 6.

The details of the unsubstituted aryl group having 6 to 12 ring-forming carbon atoms represented by R ^A are the same as those described for R ^a and R ^b except that the ring-forming carbon number is 6 to 12.

Adjacent 2 selected from R ¹⁹¹～R¹⁹⁸ other than the above single bond may be bonded to each other to form 1 or more unsubstituted benzene rings, and may not be bonded to each other to form a ring.

The details of the unsubstituted alkyl group having 1 to 6 carbon atoms represented by R ¹⁹¹～R¹⁹⁸ other than the single bond are the same as those described for R ^a and R ^b except that the carbon number is 1 to 6.

The details of the unsubstituted aryl group having 6 to 12 ring-forming carbon atoms represented by R ¹⁹¹～R¹⁹⁸ which is not the single bond are the same as those described for R ^a and R ^b except that the number of ring-forming carbon atoms is 6 to 12.

The details of the unsubstituted heterocyclic group having 5 to 13 ring-forming atoms represented by R ¹⁹¹～R¹⁹⁸ which is not the single bond are the same as those described for R ^a and R ^b except that the number of ring-forming atoms is 5 to 13.

R ¹⁹¹～R¹⁹⁸, which are not single bonds to 35, may each be a hydrogen atom.

When X is an oxygen or sulfur atom, preferably 1 selected from R ¹⁹¹～R¹⁹⁴ is a single bond to 35.

When X is NR ^A, preferably 1 selected from R ¹⁹¹～R¹⁹⁴ and R ^A is a single bond to 35.

R ^A is particularly preferably a single bond to 35 or an unsubstituted phenyl group.

The formula (1 g) is represented by the following formula.

[ Chemical formula 48]

In the formula (1 g), the components are as follows,

*36 Is the bonding position with L ¹ or L ².

1 Selected from R ^B、R^C and R ²⁰¹～R²⁰⁸ is a single bond to 37.

When L ¹ is a single bond, 36 which is a group of formula (1 g) of Ar ¹ represents a bonding position to the central nitrogen atom N,

When L ² is a single bond, 36 which is a group represented by formula (1 g) of Ar ² represents a bonding position to the central nitrogen atom N.

In one embodiment of the present invention, each of RB and R ^C is independently preferably a substituted or unsubstituted C1-6 alkyl group or phenyl group.

Details of the unsubstituted alkyl group having 1 to 6 carbon atoms represented by RB and R ^C other than the single bond are the same as those described for R ^a and R ^b except that the carbon number is 1 to 6.

The details of the unsubstituted aryl group having 6 to 12 ring-forming carbon atoms represented by R ^B and R ^C which are not the single bond are the same as those described for R ^a and R ^b except that the ring-forming carbon number is 6 to 12.

The details of the unsubstituted heterocyclic group having 5 to 13 ring-forming atoms represented by R ^B and R ^C which are not the single bond are the same as those described for R ^a and R ^b except that the number of ring-forming atoms is 5 to 13.

Details of the unsubstituted ring formed by bonding R ^B and R ^C to each other, which are not the single bond, are the same as those described for R ^a and R ^b.

Wherein adjacent 2 selected from R ²⁰¹～R²⁰⁸ other than the above single bond are not bonded to each other and thus do not form a ring.

The details of the unsubstituted alkyl group having 1 to 6 carbon atoms represented by R ²⁰¹～R²⁰⁸ other than the single bond are the same as those described for R ^a and R ^b except that the carbon number is 1 to 6.

The details of the unsubstituted aryl group having 6 to 12 ring-forming carbon atoms represented by R ²⁰¹～R²⁰⁸ which is not the single bond are the same as those described for R ^a and R ^b except that the number of ring-forming carbon atoms is 6 to 12.

The details of the unsubstituted heterocyclic group having 5 to 13 ring-forming atoms represented by R ²⁰¹～R²⁰⁸ which is not the single bond are the same as those described for R ^a and R ^b except that the number of ring-forming atoms is 5 to 13.

In one embodiment of the present invention, preferably R ²⁰² or R ²⁰⁷ is a single bond to 37.

In one embodiment of the present invention, at least one of Ar ¹ and Ar ² is preferably a group represented by the above formula (1 a) or (1 g).

In one embodiment of the present invention, it is preferable that Ar ¹ or Ar ² is a group represented by the above formula (1 a) and the group represented by the formula (1 a) satisfies at least 1 item among the following formulas (i) to (iii).

(I) R ¹⁰¹ or R ¹⁰⁵ is a single bond to 22

(Ii) R ¹⁰⁶ or R ¹¹⁰ is a single bond to 23

(Iii) R ¹¹¹ or R ¹¹⁵ is a single bond to 24

In one embodiment of the present invention, it is preferable that Ar ¹ or Ar ² is a group represented by the above formula (1 g) and that RB and R ^C in the group represented by the formula (1 g) are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms or a substituted or unsubstituted phenyl group.

In one embodiment of the present invention, it is preferable that Ar ¹ or Ar ² is a group represented by formula (1 g) above and R ²⁰² or R ²⁰⁷ in the group represented by formula (1 g) is a single bond to 37.

As described above, the "hydrogen atom" used in the present specification includes protium atom, deuterium atom and tritium atom. Thus, the inventive compounds may contain deuterium atoms of natural origin.

In addition, deuterium atoms can be intentionally introduced into the compound (1) by using a deuterated compound as part or all of the starting compound. Thus, in one embodiment of the invention, compound (1) comprises at least 1 deuterium atom. That is, the compound of the present invention may be a compound represented by the formula (1), wherein at least one of the hydrogen atoms contained in the compound is a deuterium atom.

At least one hydrogen atom selected from the following hydrogen atoms may be a deuterium atom. In the following, the "substituted or unsubstituted", carbon number and atomic number are omitted for simplicity.

When R ^a and R ^b of formula (1) are alkyl, aryl or heterocyclic groups, the groups have a hydrogen atom;

R ¹～R⁵、R⁸ of formula (1) is a hydrogen atom represented by R ⁶ and R ⁷ which are not single bonds bonded to 1;

When R ¹～R⁵、R⁸ of formula (1) and R ⁶ and R ⁷, which are not single bonds to x1, are alkyl, cycloalkyl, aryl or heterocyclyl, the hydrogen atoms of these groups;

a hydrogen atom represented by R ¹¹～R¹⁴ of formula (1);

when R ¹¹～R¹⁴ of formula (1) is an alkyl group or an aryl group, the hydrogen atoms of these groups are present;

When L ¹～L⁴ of formula (1) is arylene, the hydrogen atoms of these groups;

R ¹⁰¹～R¹⁰⁵ of formula (1 a) which is not a single bond with x 22, R ¹⁰⁶～R¹¹⁰ which is not a single bond with x 23, R ¹¹¹～R¹¹⁵ which is not a single bond with x 24;

When R ¹⁰¹～R¹⁰⁵ of formula (1 a) which is not a single bond with x 22, R ¹⁰⁶～R¹¹⁰ which is not a single bond with x 23, R ¹¹¹～R¹¹⁵ which is not a single bond with x 24 are alkyl or aryl, the hydrogen atoms of these groups;

a hydrogen atom represented by R ¹¹⁶～R¹²⁰ of formula (1 a);

when R ¹¹⁶～R¹²⁰ of formula (1 a) is an alkyl group, an aryl group, or a heterocyclic group, the hydrogen atoms of these groups are present;

A hydrogen atom represented by R ¹²¹～R¹²⁸ of formula (1 b) which is not a single bond to x 26;

When R ¹²¹～R¹²⁸ of formula (1 b) which is not a single bond to x 26 is alkyl or aryl, the hydrogen atoms of these groups;

a hydrogen atom represented by R ¹³¹～R¹⁴⁰ of formula (1 c) which is not a single bond to x 28;

When R ¹³¹～R¹⁴⁰ of formula (1 c) which is not a single bond to x 28 is alkyl or aryl, the hydrogen atoms of these groups;

A hydrogen atom represented by R ¹⁴¹～R¹⁵² of formula (1 d) which is not a single bond to x 30;

When R ¹⁴¹～R¹⁵² of formula (1 d) which is not a single bond to x 30 is alkyl or aryl, the hydrogen atoms of these groups;

a single bond of formula (1 e) other than the one bonded to x 32 is also not a hydrogen atom represented by R ¹⁶¹～R¹⁶⁵ of the above single bond bonded to x 33;

when R ¹⁶¹～R¹⁶⁵ of formula (1 e) which is not a single bond with x 32 nor the single bond with x33 is alkyl or phenyl, the hydrogen atoms of these groups;

r ¹⁷¹～R¹⁷⁵ and R ¹⁸¹～R¹⁸⁵ of formula (1 e);

When R ¹⁷¹～R¹⁷⁵ and R ¹⁸¹～R¹⁸⁵ of formula (1 e) are alkyl groups, the hydrogen atoms of these groups;

when R ^A of formula (1 f) which is not a single bond to 35 is alkyl or aryl, the hydrogen atoms of these groups;

A hydrogen atom represented by R ¹⁹¹～R¹⁹⁸ of formula (1 f) which is not a single bond to 35;

When R ¹⁹¹～R¹⁹⁸ of formula (1 f) which is not a single bond to 35 is an alkyl, aryl or heterocyclic group, the hydrogen atoms of these groups;

When R ^B and R ^C of formula (1 g) are alkyl, aryl or heterocyclic groups, the hydrogen atoms of these groups;

A hydrogen atom represented by R ²⁰¹～R²⁰⁸ of formula (1 g) which is not a single bond to 37;

When R ²⁰¹～R²⁰⁸ of formula (1 g) which is not a single bond to 37 is an alkyl, aryl or heterocyclic group, these groups have a hydrogen atom.

The deuteration rate of the inventive compounds depends on the deuteration rate of the starting compounds used. Even if a raw material having a predetermined deuteration rate is used, the protium isotope may be contained in a constant ratio from a natural source. Accordingly, the following examples of the deuteration ratio of the compound of the present invention include ratios obtained by counting only the number of deuterium atoms represented by the chemical formula, and include ratios in which trace isotopes of natural origin are considered.

The deuteration ratio of the compound of the present invention is preferably 1% or more, more preferably 3% or more, further preferably 5% or more, still more preferably 10% or more, and still more preferably 50% or more.

The inventive compound may be a mixture comprising a deuterated compound and a non-deuterated compound, a mixture of more than 2 compounds having different deuteration rates. The deuteration rate of such a mixture is preferably 1% or more, more preferably 3% or more, still more preferably 5% or more, still more preferably 10% or more, still more preferably 50% or more, and less than 100%.

The ratio of the number of deuterium atoms to the total number of hydrogen atoms in the compound of the present invention is preferably 1% or more, more preferably 3% or more, still more preferably 5% or more, still more preferably 10% or more, and 100% or less.

When the "substituted or unsubstituted XX group" contained in the above-mentioned various definitions is a substituted XX group, the details of the substituent are the same as those described in the description of the "substituted or unsubstituted" substituent ", and it is preferably an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 12 ring-forming carbon atoms or an aromatic heterocyclic group having 5 to 13 ring-forming atoms, more preferably an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 ring-forming carbon atoms. The details of each group are as described above.

The inventive compounds can be easily produced by those skilled in the art by referring to the following synthesis examples and known synthesis methods.

Specific examples of the compounds of the present invention are shown below, but are not limited to the following exemplary compounds.

In the following specific examples, D represents a deuterium atom.

[ Chemical formula 49]

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Material for organic EL element

The material for an organic EL element of the present invention contains the compound of the present invention. The content of the compound for an organic EL element is 1% by mass or more (including 100%), preferably 10% by mass or more (including 100%), more preferably 50% by mass or more (including 100%), still more preferably 80% by mass or more (including 100%), and particularly preferably 90% by mass or more (including 100%). The material for an organic EL element of the present invention is useful for the production of an organic EL element.

Organic EL element

The organic EL element of the present invention comprises an anode, a cathode, and an organic layer disposed between the anode and the cathode. The organic layer comprises a light emitting layer, at least one layer of the organic layer comprising an inventive compound.

Examples of the organic layer containing the compound of the present invention include, but are not limited to, a hole transport region (a hole injection layer, a hole transport layer, an electron blocking layer, an exciton blocking layer, and the like) provided between the anode and the light-emitting layer, a spacer layer, an electron transport region (an electron injection layer, an electron transport layer, a hole blocking layer, and the like) provided between the cathode and the light-emitting layer, and the like. The compound of the present invention is preferably used as a material for a hole transporting region or a light emitting layer of a fluorescent or phosphorescent EL element, more preferably used as a material for a hole transporting region, further preferably used as a material for a hole injecting layer, a hole transporting layer, an electron blocking layer, or an exciton blocking layer, particularly preferably used as a material for a hole injecting layer or a hole transporting layer.

The organic EL element of the present invention may be a fluorescent or phosphorescent single-color light-emitting element, a fluorescent/phosphorescent mixed white light-emitting element, a simple type having a single light-emitting unit, or a Tandem type (Tandem) having a plurality of light-emitting units, and among these, a fluorescent light-emitting element is preferable. Here, the "light emitting unit" refers to a minimum unit that includes an organic layer and in which at least one layer is a light emitting layer and injected holes and electrons are recombined by occurrence of light emission.

For example, the following element configuration is typical of a simple organic EL element.

(1) Anode/light emitting unit/cathode

In addition, the light emitting unit may be a multi-layer type having a plurality of phosphorescent light emitting layers or fluorescent light emitting layers, and in this case, a spacer layer may be provided between the light emitting layers for the purpose of preventing excitons generated in the phosphorescent light emitting layers from diffusing to the fluorescent light emitting layers. A typical layer configuration of the simple light emitting unit is shown below. The layers in brackets are optional.

(A) (hole injection layer /) hole transport layer/fluorescent light emitting layer/electron transport layer (/ electron injection layer)

(B) (hole injection layer /) hole transport layer/1 st fluorescent light-emitting layer/2 nd fluorescent light-emitting layer/electron transport layer (/ electron injection layer)

(C) (hole injection layer /) hole transport layer/phosphorescent light emitting layer/spacer layer/fluorescent light emitting layer/electron transport layer (/ electron injection layer)

(D) (hole injection layer /) hole transport layer/1 st phosphorescent light emitting layer/2 nd phosphorescent light emitting layer/spacer layer/fluorescent light emitting layer/electron transport layer (/ electron injection layer)

(E) (hole injection layer /) hole transport layer/phosphorescent light emitting layer/spacer layer/1 st fluorescent light emitting layer/2 nd fluorescent light emitting layer/electron transport layer (/ electron injection layer)

(F) (hole injection layer /) hole transport layer/electron blocking layer/fluorescent light emitting layer/electron transport layer (/ electron injection layer)

(G) (hole injection layer /) hole transport layer/exciton blocking layer/fluorescent light emitting layer/electron transport layer (/ electron injection layer)

(H) (hole injection layer /) 1 st hole transport layer/2 nd hole transport layer/fluorescent light-emitting layer/electron transport layer (/ electron injection layer)

(I) (hole injection layer /) 1 st hole transport layer/2 nd hole transport layer/fluorescent light-emitting layer/1 st electron transport layer/2 nd electron transport layer (/ electron injection layer)

(J) (hole injection layer /) hole transport layer/fluorescent light-emitting layer/hole blocking layer/electron transport layer (/ electron injection layer)

(K) (hole injection layer /) hole transport layer/fluorescent light emitting layer/exciton blocking layer/electron transport layer (/ electron injection layer)

(1) (Hole injection layer /) 1 st hole transport layer/2 nd hole transport layer/1 st fluorescent light-emitting layer/2 nd fluorescent light-emitting layer/1 st electron transport layer/2 nd electron transport layer (/ electron injection layer)

(M) (hole injection layer /) 1 st hole transport layer/2 nd hole transport layer/3 rd hole transport layer/1 st fluorescent light-emitting layer/2 nd fluorescent light-emitting layer/1 st electron transport layer/2 nd electron transport layer (/ electron injection layer)

(N) (hole injection layer /) 1 st hole transport layer/2 nd hole transport layer/3 rd hole transport layer/fluorescent light-emitting layer/1 st electron transport layer/2 nd electron transport layer (/ electron injection layer)

The phosphorescent or fluorescent light-emitting layers may be light-emitting layers each of which exhibits a different light-emitting color. Specifically, the light-emitting unit (f) includes a layer structure such as a hole transport layer (hole injection layer /) a1 st phosphorescent light-emitting layer (red light emission)/a 2 nd phosphorescent light-emitting layer (green light emission)/a spacer layer/a fluorescent light-emitting layer (blue light emission)/an electron transport layer.

An electron blocking layer may be provided between each light emitting layer and the hole transport layer or the spacer layer as appropriate. In addition, a hole blocking layer may be provided between each light emitting layer and the electron transport layer as appropriate. By providing the electron blocking layer and the hole blocking layer, electrons or holes can be enclosed in the light emitting layer, and the recombination probability of charges in the light emitting layer can be improved, thereby improving the light emitting efficiency.

Typical element configurations of the tandem organic EL element include the following.

(2) Anode/1 st light-emitting unit/intermediate layer/2 nd light-emitting unit/cathode

Here, the 1 st light-emitting unit and the 2 nd light-emitting unit may be, for example, each independently selected from the light-emitting units described above.

The intermediate layer is also generally referred to as an intermediate electrode, an intermediate conductive layer, a charge generation layer, an electron extraction layer, a connection layer, or an intermediate insulating layer, and may be formed using a known material that supplies electrons to the 1 st light-emitting cell and holes to the 2 nd light-emitting cell.

Fig. 1 is a schematic diagram showing an example of the structure of an organic EL element of the present invention. The organic EL element 1 includes a substrate 2, an anode 3, a cathode 4, and a light-emitting unit 10 disposed between the anode 3 and the cathode 4. The light emitting unit 10 has a light emitting layer 5. A hole transport region 6 (hole injection layer, hole transport layer, etc.) is provided between the light-emitting layer 5 and the anode 3, and an electron transport region 7 (electron injection layer, electron transport layer, etc.) is provided between the light-emitting layer 5 and the cathode 4. In addition, an electron blocking layer (not shown) may be provided on the anode 3 side of the light emitting layer 5, and a hole blocking layer (not shown) may be provided on the cathode 4 side of the light emitting layer 5, respectively. This can further improve the efficiency of generating excitons in the light-emitting layer 5 by blocking electrons and holes in the light-emitting layer 5.

Fig. 2 is a schematic diagram showing another configuration of the organic EL element of the present invention. The organic EL element 11 includes a substrate 2, an anode 3, a cathode 4, and a light-emitting unit 20 disposed between the anode 3 and the cathode 4. The light emitting unit 20 has a light emitting layer 5. The hole transport region disposed between the anode 3 and the light-emitting layer 5 is formed of a hole injection layer 6a, a1 st hole transport layer 6b, and a2 nd hole transport layer 6 c. The electron transport region disposed between the light-emitting layer 5 and the cathode 4 is formed by the 1 st electron transport layer 7a and the 2 nd electron transport layer 7 b.

Fig. 3 is a schematic diagram showing another configuration of the organic EL element of the present invention. The organic EL element 12 includes a substrate 2, an anode 3, a cathode 4, and a light-emitting unit 30 disposed between the anode 3 and the cathode 4. The light emitting unit 30 has a light emitting layer 5. The hole transport region disposed between the anode 3 and the light-emitting layer 5 is formed of a hole injection layer 6a, a1 st hole transport layer 6b, a2 nd hole transport layer 6c, and a3 rd hole transport layer 6 d. The electron transport region disposed between the light-emitting layer 5 and the cathode 4 is formed by the 1 st electron transport layer 7a and the 2 nd electron transport layer 7 b.

In the present invention, a host combined with a fluorescent dopant material (fluorescent light-emitting material) is referred to as a fluorescent host, and a host combined with a phosphorescent dopant material is referred to as a phosphorescent host. Fluorescent and phosphorescent hosts are not distinguished only by molecular structure. That is, the phosphorescent host means a material forming a phosphorescent light emitting layer containing a phosphorescent dopant, and does not mean that the material cannot be used as a material forming a fluorescent light emitting layer. The same applies to the fluorescent body.

Substrate board

The substrate serves as a support for the organic EL element. As the substrate, for example, a plate of glass, quartz, plastic, or the like can be used. In addition, a flexible substrate may be used. Examples of the flexible substrate include plastic substrates made of polycarbonate, polyarylate, polyethersulfone, polypropylene, polyester, polyvinyl fluoride, and polyvinyl chloride. In addition, an inorganic vapor deposition film may be used.

Anode

The anode formed on the substrate is preferably a metal, an alloy, a conductive compound, a mixture thereof, or the like having a large work function (specifically, 4.0eV or more). Specifically, examples thereof include Indium Tin Oxide (ITO), indium Tin Oxide containing silicon or silicon Oxide, indium zinc Oxide, indium Oxide containing tungsten Oxide and zinc Oxide, and graphene. Examples of the metal include gold (Au), platinum (Pt), nickel (Ni), tungsten (W), chromium (Cr), molybdenum (Mo), iron (Fe), cobalt (Co), copper (Cu), palladium (Pd), titanium (Ti), and nitrides thereof (for example, titanium nitride).

These materials are typically formed into films by sputtering. For example, indium oxide-zinc oxide can be formed by sputtering using a target in which zinc oxide is added in an amount of 1 to 10wt% to indium oxide, and indium oxide containing tungsten oxide and zinc oxide can be formed by sputtering using a target in which tungsten oxide is added in an amount of 0.5 to 5wt% and zinc oxide is added in an amount of 0.1 to 1wt% to indium oxide. The composition may be produced by vacuum vapor deposition, coating, ink jet, spin coating, or the like.

Hole transport region

As described above, the organic layer may include a hole transport region between the anode and the light emitting layer. The hole transport region is composed of a hole injection layer, a hole transport layer, an electron blocking layer, and the like. The hole transport region preferably comprises an inventive compound. The inventive compound is preferably contained in at least one of these layers constituting the hole transport layer, and the inventive compound is particularly preferably contained in the hole transport layer.

The hole injection layer formed adjacent to the anode is formed using a material that is easily subjected to hole injection regardless of the work function of the anode, and therefore, a material that is generally used as an electrode material (for example, a metal, an alloy, a conductive compound, and a mixture thereof, an element belonging to the first group or the second group of the periodic table) can be used.

An alkali metal such as lithium (Li) and cesium (Cs), an alkaline earth metal such as magnesium (Mg), calcium (Ca) and strontium (Sr), an alloy containing the same (for example, mgAg, alLi), a rare earth metal such as europium (Eu) and ytterbium (Yb), an alloy containing the same, and the like can be used as the material having a small work function. In the case of forming the anode using an alkali metal, an alkaline earth metal, or an alloy containing them, a vacuum vapor deposition method or a sputtering method may be used. In addition, when silver paste or the like is used, a coating method, an inkjet method, or the like may be used.

Hole injection layer

The hole injection layer is a layer containing a material having high hole injection property (hole injection material), and is formed between the anode and the light-emitting layer, or between the hole transport layer and the anode in the presence of the hole transport layer.

As the hole injecting material other than the inventive compound, molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, manganese oxide, or the like can be used.

Examples of the hole injection layer material include aromatic amines such as 4,4',4″ -tris (N, N-diphenylamino) triphenylamine (abbreviated as TDATA), 4',4″ -tris [ N- (3-methylphenyl) -N-phenylamino ] triphenylamine (abbreviated as MTDATA), 4 '-bis [ N- (4-diphenylaminophenyl) -N-phenylamino ] biphenyl (abbreviated as DPAB), 4' -bis (N- {4- [ N '- (3-methylphenyl) -N' -phenylamino ] phenyl } -N-phenylamino) biphenyl (abbreviated as DNTPD), 1,3, 5-tris [ N- (4-diphenylaminophenyl) -N-phenylamino ] benzene (abbreviated as DPA 3B), 3- [ N- (9-phenylcarbazole-3-yl) -N-phenylamino ] -9-phenylcarbazole (abbreviated as pczpczpcz 1), 3, 6-bis [ N- (9-phenylcarbazole-3-yl) -N-phenylamino ] -9-phenylcarbazole (abbreviated as pczpcz 2), and 3- [ N- (4-diphenylaminophenyl) -N-phenylamino ] -9-phenylcarbazole (abbreviated as pcz 1).

Polymer compounds (oligomers, dendrimers, polymers, etc.) may also be used. Examples thereof include polymer compounds such as Poly (N-vinylcarbazole) (abbreviated as PVK), poly (4-vinyltriphenylamine) (abbreviated as PVTPA), poly [ N- (4- { N '- [4- (4-diphenylamino) phenyl ] phenyl-N' -phenylamino } phenyl) methacrylamide ] (abbreviated as PTPDMA), and Poly [ N, N '-bis (4-butylphenyl) -N, N' -bis (phenyl) benzidine ] (abbreviated as Poly-TPD). In addition, acid-added polymer compounds such as poly (3, 4-ethylenedioxythiophene)/poly (styrenesulfonic acid) (PEDOT/PSS) and polyaniline/poly (styrenesulfonic acid) (PAni/PSS) may be used.

In addition, an acceptor material such as a Hexaazatriphenylene (HAT) compound represented by the following formula (K) is also preferably used.

[ Chemical formula 180]

(In the above formula, R ²²¹～R²²⁶ independently represents cyano, -CONH ₂, carboxyl, or-COOR ²²⁷(R²²⁷ represents alkyl group having 1 to 20 carbon atoms or cycloalkyl group having 3 to 20 carbon atoms). In addition, adjacent 2 selected from R ²²¹ and R ²²²、R²²³ and R ²²⁴, and R ²²⁵ and R ²²⁶ may be bonded to each other to form a group represented by-CO-O-CO-. )

Examples of R2 ²⁷ include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, and cyclohexyl.

Hole transport layer

The hole-transporting layer is a layer containing a material having high hole-transporting property (hole-transporting material), and is formed between the anode and the light-emitting layer, or between the hole-injecting layer and the light-emitting layer in the presence of the hole-injecting layer. The inventive compound may be used for the hole transport layer alone or in combination with the following compound.

The hole transport layer may have a single-layer structure or a multilayer structure including 2 or more layers. For example, the hole transport layer may be a 2-layer structure including a1 st hole transport layer (anode side) and a2 nd hole transport layer (cathode side). That is, the hole transport region may include a1 st hole transport layer on the anode side and a2 nd hole transport layer on the cathode side. In addition, the hole transport layer may have a 3-layer structure including a1 st hole transport layer, a2 nd hole transport layer, and a 3 rd hole transport layer in this order from the anode side. That is, the 3 rd hole transport layer may be disposed between the 2 nd hole transport layer and the light-emitting layer.

In one embodiment of the present invention, the hole transport layer of the single-layer structure is preferably adjacent to the light emitting layer, and the hole transport layer closest to the cathode in the multilayer structure, for example, the 2 nd hole transport layer of the 2-layer structure or the 3 rd hole transport layer of the 3-layer structure is preferably adjacent to the light emitting layer. In another embodiment of the present invention, an electron blocking layer or the like described below may be interposed between the hole transporting layer and the light emitting layer having the single-layer structure or between the hole transporting layer and the light emitting layer closest to the light emitting layer in the multilayer structure.

In the case where the hole transport layer has a 2-layer structure, at least one of the 1 st hole transport layer and the 2 nd hole transport layer contains the inventive compound. That is, the inventive compound is contained in only the 1 st hole transport layer, only the 2 nd hole transport layer, or both the 1 st hole transport layer and the 2 nd hole transport layer.

In one embodiment of the present invention, it is preferable that the inventive compound is contained in the 2 nd hole transport layer. That is, it is preferable that the inventive compound is contained only in the 2 nd hole transport layer, and that the inventive compound is contained in the 1 st hole transport layer and the 2 nd hole transport layer.

In the case where the hole transport layer has a 3-layer structure, at least one of the 1 st to 3 rd hole transport layers contains the inventive compound. That is, the inventive compound is contained in only 1 st layer (only 1 st hole transport layer, only 2 nd hole transport layer, or only 3 rd hole transport layer) selected from 1 st to 3 rd hole transport layers, only 2 nd layer (only 1 st and 2 nd hole transport layers, only 1 st and 3 rd hole transport layers, or only 2 nd and 3 rd hole transport layers), or all layers of 1 st to 3 rd hole transport layers.

In one embodiment of the present invention, it is preferable that the inventive compound is contained in the 3 rd hole transport layer. That is, it is preferable that the inventive compound is contained only in the 3 rd hole transport layer, or that the inventive compound is contained in one or both of the 3 rd hole transport layer and the 1 st hole transport layer and the 2 nd hole transport layer.

In one embodiment of the present invention, the inventive compound contained in each of the hole transport layers is preferably a protium from the standpoint of manufacturing cost. The protium is an inventive compound in which all hydrogen atoms in the inventive compound are protium atoms.

Accordingly, the present invention includes an organic EL element comprising an inventive compound formed substantially only from protium, and an organic EL element comprising an inventive compound formed substantially only from protium in at least one of the 1 st to 3 rd hole transport layers, wherein one or both of the 1 st and 2 nd hole transport layers (in the case of a 2-layer structure). The meaning of "an inventive compound formed substantially only from protium" means that the protium content is 90 mol% or more, preferably 95 mol% or more, more preferably 99 mol% or more (each including 100%) based on the total amount of the inventive compound.

Examples of the hole transporting layer material other than the inventive compound include an aromatic amine compound, a carbazole derivative, and an anthracene derivative.

Examples of the aromatic amine compound include: 4,4' -bis [ N- (1-naphthyl) -N-phenylamino ] biphenyl (abbreviation: NPB), N ' -bis (3-methylphenyl) -N, N ' -diphenyl- [1,1' -biphenyl ] -4,4' -diamine (abbreviated as TPD), 4-phenyl-4 ' - (9-phenylfluoren-9-yl) triphenylamine (abbreviated as BAFLP), 4' -bis [ N- (9, 9-dimethylfluoren-2-yl) -N-phenylamino ] biphenyl (abbreviated as DFLDPBi), 4',4 "-tris (N, N-diphenylamino) triphenylamine (abbreviated as TDATA), 4',4" -tris [ N- (3-methylphenyl) -N-phenylamino ] triphenylamine (abbreviated as MTDATA), and 4,4' -bis [ N- (spiro-9, 9' -bifluor-2-yl) -N-phenylamino ] biphenyl (abbreviated as BSPB). The compound has hole mobility of more than 10 ^-6cm²/Vs.

Examples of carbazole derivatives include 4,4' -bis (9-carbazolyl) biphenyl (abbreviated as CBP), 9- [4- (9-carbazolyl) phenyl ] -10-phenylanthracene (abbreviated as CzPA), and 9-phenyl-3- [4- (10-phenyl-9-anthryl) phenyl ] -9H-carbazole (abbreviated as PCzPA).

Examples of the anthracene derivative include 2-t-butyl-9, 10-bis (2-naphthyl) anthracene (abbreviated as t-BuDNA), 9, 10-bis (2-naphthyl) anthracene (abbreviated as DNA), and 9, 10-diphenylanthracene (abbreviated as DPAnth).

Polymer compounds such as poly (N-vinylcarbazole) (PVK) and poly (4-vinyltriphenylamine) (PVTPA) may be used.

Among them, compounds other than the above compounds may be used as long as they have a higher hole-transporting property than electron-transporting property.

In the organic EL element having the hole transport layer of the 2-layer structure of the present invention, it is preferable that the 1 st hole transport layer contains 1 or two or more compounds represented by the following formula (11) or formula (12).

In the organic EL element having the hole transport layer of the 3-layer structure of the present invention, it is preferable that one or both of the 1 st hole transport layer and the 2 nd hole transport layer contain 1 or two or more compounds represented by the following formula (11) or (12).

In the organic EL element having the hole transport layer of the n-layer structure (n is an integer of 4 or more) of the present invention, it is preferable that at least 1 layer of the 1 st hole transport layer to the (n-1) th hole transport layer contains 1 or two or more compounds represented by the following formula (11) or formula (12).

[ Chemical formula 181]

[ In the above-mentioned formula (11) and formula (12),

L ^A1、L^B1、L^C1、L^A2、L^B2、L^C2 and L ^D2 are each independently a single bond, a substituted or unsubstituted arylene group having 6 to 50 ring-forming carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring-forming carbon atoms,

K is 1, 2, 3 or 4,

When k is 1, L ^E2 is a substituted or unsubstituted arylene group having 6 to 50 ring-forming carbon atoms or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring-forming carbon atoms,

In the case where k is 2, 3 or 4, 2, 3 or 4L ^E2 are identical to or different from each other,

In the case where k is 2,3 or 4, a plurality of L ^E2 are bonded to each other to form a substituted or unsubstituted monocyclic ring, are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,

L ^E2 which does not form the single ring and does not form the condensed ring is a substituted or unsubstituted arylene group having 6 to 50 ring-forming carbon atoms or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring-forming carbon atoms,

A ¹、B¹、C¹、A²、B²、C² and D ² are each independently a substituted or unsubstituted aryl group having 6 to 50 ring-forming carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, or-Si (R' ₉₀₁)(R'₉₀₂)(R'₉₀₃),

R '₉₀₁、R'₉₀₂ and R' ₉₀₃ are each independently a substituted or unsubstituted aryl group having 6 to 50 ring-forming carbon atoms,

Where there are plural R '₉₀₁, plural R' ₉₀₁ are the same or different from each other,

Where there are plural R '₉₀₂, plural R' ₉₀₂ are the same or different from each other,

Where there are plural R '₉₀₃, plural R' ₉₀₃ are the same or different from each other. ]

In the formula (11) and the formula (12), it is preferable that a ¹、B¹、C¹、A²、B²、C² and D ² are each independently selected from a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothienyl group, and a substituted or unsubstituted carbazolyl group.

In addition, more preferably, at least one of a ¹、B¹ and C ¹ in formula (11), and at least one of A2, B ²、C², and D ² in formula (12) is a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, or a substituted or unsubstituted carbazolyl group.

The fluorenyl group selected from A ¹、B¹、C¹、A²、B²、C² and D ² may have a substituent at the 9-position, and may be, for example, 9-dimethylfluorenyl or 9, 9-diphenylfluorenyl. In addition, a ring may be formed by substituents at the 9-position with each other, and for example, a fluorene skeleton or a xanthene skeleton may be formed by substituents at the 9-position with each other.

L ^A1、L^B1、L^C1、L^A2、L^B2、L^C2 and L ^D2 are preferably each independently a single bond, a substituted or unsubstituted arylene group having 6 to 12 ring-forming carbon atoms.

Specific examples of the compounds represented by the formulas (11) and (12) include the following compounds.

[ Chemical formula 182]

Dopant material of light emitting layer

The light-emitting layer is a layer containing a material having high light-emitting properties (dopant material), and various materials can be used. For example, a fluorescent light-emitting material, a phosphorescent light-emitting material may be used as the dopant material. The fluorescent light-emitting material is a compound that emits light in a singlet excited state, and the phosphorescent light-emitting material is a compound that emits light in a triplet excited state.

In one embodiment of the organic EL element according to the present invention, the light-emitting layer is a single layer.

In another embodiment of the organic EL element according to the present invention, the light-emitting layer includes a1 st light-emitting layer and a 2 nd light-emitting layer.

As a blue-based fluorescent light-emitting material which can be used for the light-emitting layer, a pyrene derivative, a styrylamine derivative, a,Derivatives, fluoranthene derivatives, fluorene derivatives, diamine derivatives, triarylamine derivatives, and the like. Specifically, N ' -bis [4- (9H-carbazol-9-yl) phenyl ] -N, N ' -diphenylstilbene-4, 4' -diamine (abbreviated as YGA 2S), 4- (9H-carbazol-9-yl) -4' - (10-phenyl-9-anthryl) triphenylamine (abbreviated as YGAPA), 4- (10-phenyl-9-anthryl) -4' - (9-phenyl-9H-carbazol-3-yl) triphenylamine (abbreviated as PCBAPA) and the like can be mentioned.

As a green-based fluorescent light-emitting material that can be used for the light-emitting layer, an aromatic amine derivative or the like can be used. Specifically, N- (9, 10-diphenyl-2-anthryl) -N, 9-diphenyl-9H-carbazol-3-amine (abbreviated as: 2 PCAPA), N- [9, 10-bis (1, 1' -biphenyl-2-yl) -2-anthryl ] -N, 9-diphenyl-9H-carbazol-3-amine (abbreviated as: 2 PCABPhA), N- (9, 10-diphenyl-2-anthryl) -N, N ', N ' -triphenyl-1, 4-phenylenediamine (abbreviated as: 2 DPAPA), N- [9, 10-bis (1, 1' -biphenyl-2-yl) -2-anthryl ] -N, N ', N ' -triphenyl-1, 4-phenylenediamine (abbreviated as: 2 DPABPhA), N- [9, 10-bis (1, 1' -biphenyl-2-yl) ] -N- [4- (9H-carbazol-9-yl) phenyl ] -N-phenylanthracene-2-amine (abbreviated as: 2 YGABPhA), N, 9-triphenylanthracene-9-amine (abbreviated as: 34) and the like can be cited.

As a red-based fluorescent light-emitting material that can be used for the light-emitting layer, a naphthacene derivative, a diamine derivative, or the like can be used. Specifically, N, N, N ', N' -tetrakis (4-methylphenyl) naphthacene-5, 11-diamine (abbreviated as p-mPhTD), 7, 14-diphenyl-N, N, N ', N' -tetrakis (4-methylphenyl) acenaphtho [1,2-a ] fluoranthene-3, 10-diamine (abbreviated as p-mPhAFD), and the like are exemplified.

In one aspect of the present invention, it is preferable that the light emitting layer contains a fluorescent light emitting material (fluorescent dopant material).

As a blue-based phosphorescent light-emitting material that can be used for the light-emitting layer, a metal complex such as an iridium complex, an osmium complex, or a platinum complex can be used. Specifically, bis [2- (4 ',6' -difluorophenyl) pyridine-N, C2'] iridium (III) tetrakis (1-pyrazolyl) borate (abbreviated as FIr 6), bis [2- (4', 6 '-difluorophenyl) pyridine-N, C2' ] iridium (III) pyridine formate (abbreviated as FIrpic), bis [2- (3 ',5' -bistrifluoromethylphenyl) pyridine-N, C2'] iridium (III) pyridine formate (abbreviated as Ir (CF 3 ppy) 2 (pic)), bis [2- (4', 6 '-difluorophenyl) pyridine-N, C2' ] iridium (III) acetylacetonate (abbreviated as FIracac) and the like can be cited.

As a green-based phosphorescent light-emitting material that can be used for the light-emitting layer, iridium complex or the like can be used. Examples thereof include tris (2-phenylpyridine-N, C2 ') iridium (III) (abbreviated as Ir (ppy) 3), bis (2-phenylpyridine-N, C2') iridium (III) acetylacetonate (abbreviated as Ir (ppy) 2 (acac)), bis (1, 2-diphenyl-1H-benzimidazole) iridium (III) acetylacetonate (abbreviated as Ir (pbi) 2 (acac)), and bis (benzo [ H ] quinoline) iridium (III) acetylacetonate (abbreviated as Ir (bzq) 2 (acac)).

As a red-based phosphorescent material that can be used for the light-emitting layer, a metal complex such as iridium complex, platinum complex, terbium complex, or europium complex can be used. Specifically, there may be mentioned organometallic complexes such as bis [2- (2 ' -benzo [4,5- α ] thienyl) pyridine-N, C3' ] iridium (III) acetylacetonate (abbreviated as Ir (btp) 2 (acac)), bis (1-phenylisoquinoline-N, C2 ') iridium (III) acetylacetonate (abbreviated as Ir (piq) 2 (acac)), (acetylacetonate) bis [2, 3-bis (4-fluorophenyl) quinoxaline ] iridium (III) (abbreviated as Ir (Fdpq) 2 (acac)), and 2,3,7,8,12,13,17, 18-octaethyl-21H, 23H-porphyrin platinum (II) (abbreviated as PtOEP).

In addition, rare earth metal complexes such as tris (acetylacetonato) (Shan Feige in) terbium (III) (abbreviated as Tb (acac) 3 (Phen)), tris (1, 3-diphenyl-1, 3-acetonyl) (Shan Feige in) europium (III) (abbreviated as Eu (DBM) 3 (Phen)), tris [1- (2-thenoyl) -3, 3-trifluoroacetonyl ] (Shan Feige in) europium (III) (abbreviated as Eu (TTA) 3 (Phen)) are useful as phosphorescent materials because they are luminescent (electron transitions between different multiple degrees) from rare earth metal ions.

Host material for light-emitting layer

The light-emitting layer may be formed by dispersing the dopant material in another material (host material). Preferably, a material is used that has a lowest unoccupied orbital level (LUMO level) higher than the dopant material and a highest occupied orbital level (HOMO level) lower than the dopant material.

As the host material, for example, there is used

(1) Metal complexes such as aluminum complexes, beryllium complexes, and zinc complexes,

(2) Heterocyclic compounds such as oxadiazole derivatives, benzimidazole derivatives, or phenanthroline derivatives,

(3) Carbazole derivative, anthracene derivative, phenanthrene derivative, pyrene derivative, orCondensed aromatic compounds such as derivatives,

(4) Aromatic amine compounds such as triarylamine derivatives and condensed polycyclic aromatic amine derivatives.

For example, metal complexes such as tris (8-hydroxyquinoline) aluminum (III) (abbreviated as Alq), tris (4-methyl-8-hydroxyquinoline) aluminum (III) (abbreviated as Almq 3), bis (10-hydroxybenzo [ h ] quinoline) beryllium (II) (abbreviated as BeBq 2), bis (2-methyl-8-hydroxyquinoline) (4-phenylphenol) aluminum (III) (abbreviated as BAlq), bis (8-hydroxyquinoline) zinc (II) (abbreviated as Znq), bis [2- (2-benzoxazolyl) phenol ] zinc (II) (abbreviated as ZnPBO), and bis [2- (2-benzothiazolyl) phenol ] zinc (II) (abbreviated as ZnBTZ) can be used;

heterocyclic compounds such as 2- (4-biphenyl) -5- (4-tert-butylphenyl) -1,3, 4-oxadiazole (abbreviated as PBD), 1, 3-bis [5- (p-tert-butylphenyl) -1,3, 4-oxadiazol-2-yl ] benzene (abbreviated as OXD-7), 3- (4-biphenyl) -4-phenyl-5- (4-tert-butylphenyl) -1,2, 4-triazole (abbreviated as TAZ), 2' - (1, 3, 5-trimethoyl) tris (1-phenyl-1H-benzimidazole) (abbreviated as TPBI), bathophenanthroline (abbreviated as BPhen), bathocuproine (abbreviated as BCP);

9- [4- (10-phenyl-9-anthryl) phenyl ] -9H-carbazole (abbreviation: czPA), 3, 6-diphenyl-9- [4- (10-phenyl-9-anthryl) phenyl ] -9H-carbazole (abbreviation: DPCzPA), 9, 10-bis (3, 5-diphenylphenyl) anthracene (abbreviation: DPPA), 9, 10-bis (2-naphthyl) anthracene (abbreviated as DNA), 2-tert-butyl-9, 10-bis (2-naphthyl) anthracene (abbreviated as t-BuDNA), 9 '-dianthracene (abbreviated as BANT), 9' - (stilbene-3, 3 '-diyl) diphenanthrene (abbreviated as DPNS), 9' - (stilbene-4, 4 '-diyl) diphenanthrene (abbreviated as DPNS 2), 3' - (benzene-1, 3, 5-diyl) tripyrene (abbreviated as TPB 3), 9, 10-diphenylanthracene (abbreviated as DPAnth), 6, 12-dimethoxy-5, 11-diphenyl And an isosdensed aromatic compound

N, N-diphenyl-9- [4- (10-phenyl-9-anthryl) phenyl ] -9H-carbazol-3-amine (abbreviation: czA PA), 4- (10-phenyl-9-anthryl) triphenylamine (abbreviation: DPhPA), N, 9-diphenyl-N- [4- (10-phenyl-9-anthryl) phenyl ] -9H-carbazol-3-amine (abbreviation: PCAPA), N, 9-diphenyl-N- {4- [4- (10-phenyl-9-anthryl) phenyl ] phenyl } -9H-carbazol-3-amine (abbreviation: PCAPBA), N- (9, 10-diphenyl-2-anthryl) -N, 9-diphenyl-9H-carbazol-3-amine (abbreviation: 2 PCAPA), 4' -bis [ N- (1-naphthyl) -N-phenylamino ] biphenyl (abbreviation: NPB or alpha-NPD), N ' -bis (3-methylphenyl) -N, N ' -diphenyl- [1,1' -biphenyl ] -4,4' -diamine (abbreviation: PCAPBA), N- (9, 10-diphenyl-2-anthryl) -N, 4' -bis [ N- (1-naphthyl) -N-phenylamino ] biphenyl (abbreviation: NPB or alpha-NPD), 4' -bis [4, 4' -methyl ] fluorene (LDI) -2-diphenyl (P-N, 9' -diphenyl-9-L-3-amine (abbreviation: DFI) Aromatic amine compounds such as 4,4 '-bis [ N- (spiro-9, 9' -bifluorene-2-yl) -N-phenylamino ] biphenyl (BSPB). Two or more kinds of host materials may be used.

In particular, in the case of a blue fluorescent element, the anthracene compound described below is preferably used as a host material.

[ Chemical formula 183]

[ Chemical formula 184]

[ Chemical formula 185]

In one embodiment of the organic EL element according to the present invention, when the light-emitting layer includes the 1 st light-emitting layer and the 2 nd light-emitting layer, at least one of the components constituting the 1 st light-emitting layer is different from the component constituting the 2 nd light-emitting layer. For example, the dopant material contained in the 1 st light-emitting layer is different from the dopant material contained in the 2 nd light-emitting layer, and the host material contained in the 1 st light-emitting layer is different from the host material contained in the 2 nd light-emitting layer.

In the organic EL element of the present invention, the light-emitting layer may contain a luminescent compound (hereinafter, may be simply referred to as "luminescent compound") that emits fluorescence having a main peak wavelength of 500nm or less.

The main peak to peak wavelength of the compound was measured as follows. A5. Mu. Mol/L toluene solution of the compound to be measured was prepared and placed in a quartz cuvette, and the luminescence spectrum of the sample was measured at room temperature (300K) (the vertical axis represents the luminescence intensity, and the horizontal axis represents the wavelength). The luminescence spectrum can be measured by a spectrophotometer (apparatus name: F-7000) manufactured by Hitachi, inc. of Hitachi, new technology. The light emission spectrum measuring device is not limited to the device used herein.

In the emission spectrum, the peak wavelength of the emission spectrum at which the emission intensity reaches the maximum is set as the main peak-to-peak wavelength. In the present specification, the main peak-to-peak wavelength may be referred to as a fluorescence emission main peak-to-peak wavelength (FL-peak).

The fluorescent compound may be the dopant material or the host material.

In the case where the light-emitting layer is a single layer, only one of the dopant material and the host material may be the fluorescent compound, or both may be the fluorescent compound.

In the case where the light-emitting layer includes the 1 st light-emitting layer (anode side) and the 2 nd light-emitting layer (cathode side), only one of the 1 st light-emitting layer and the 2 nd light-emitting layer may include the fluorescent compound, or both of the light-emitting layers may include the fluorescent compound. When the 1 st light-emitting layer contains the above-mentioned fluorescent compound, only one of the dopant material and the host material contained in the 1 st light-emitting layer may be the above-mentioned fluorescent compound, or both may be the above-mentioned fluorescent compound. In the case where the 2 nd light-emitting layer contains the above-mentioned fluorescent compound, only one of the dopant material and the host material contained in the 2 nd light-emitting layer may be the above-mentioned fluorescent compound, or both may be the above-mentioned fluorescent compound.

Electron transport layer

The electron transport layer is a layer containing a material having high electron transport properties (electron transport material), and is formed between the light-emitting layer and the cathode, or between the electron injection layer and the light-emitting layer in the presence of the electron injection layer.

The electron transport layer may have a single-layer structure or a multilayer structure including 2 or more layers. For example, the electron transport layer may be a 2-layer structure including a1 st electron transport layer (anode side) and a2 nd electron transport layer (cathode side). In one embodiment of the present invention, the electron transport layer of the single-layer structure is preferably adjacent to the light emitting layer, or the electron transport layer closest to the anode in the multi-layer structure, for example, the 1 st electron transport layer of the 2-layer structure is preferably adjacent to the light emitting layer. In another embodiment of the present invention, a hole blocking layer or the like described below may be interposed between the electron transport layer and the light emitting layer having the single-layer structure or between the electron transport layer and the light emitting layer closest to the light emitting layer in the multilayer structure.

The electron transport layer may be used, for example

(1) Metal complexes such as aluminum complex, beryllium complex, zinc complex, etc,

(2) Heteroaromatic compounds such as imidazole derivatives, benzimidazole derivatives, azine derivatives, carbazole derivatives, phenanthroline derivatives, and the like,

(3) A polymer compound.

Examples of the metal complex include tris (8-hydroxyquinoline) aluminum (III) (abbreviated as Alq), tris (4-methyl-8-hydroxyquinoline) aluminum (abbreviated as Almq 3), bis (10-hydroxybenzo [ h ] quinoline) beryllium (abbreviated as BeBq 2), bis (2-methyl-8-hydroxyquinoline) (4-phenylphenol) aluminum (III) (abbreviated as BAlq), bis (8-hydroxyquinoline) zinc (II) (abbreviated as Znq), bis [2- (2-benzoxazolyl) phenol ] zinc (II) (abbreviated as ZnPBO), and bis [2- (2-benzothiazolyl) phenol ] zinc (II) (abbreviated as ZnBTZ).

Examples of the heteroaromatic compound include 2- (4-biphenyl) -5- (4-tert-butylphenyl) -1,3, 4-oxadiazole (abbreviated as PBD), 1, 3-bis [5- (p-tert-butylphenyl) -1,3, 4-oxadiazol-2-yl ] benzene (abbreviated as OXD-7), 3- (4-tert-butylphenyl) -4-phenyl-5- (4-biphenyl) -1,2, 4-triazole (abbreviated as TAZ), 3- (4-tert-butylphenyl) -4- (4-ethylphenyl) -5- (4-biphenyl) -1,2, 4-triazole (abbreviated as p-ETAZ), bathophenanthroline (abbreviated as BPhen), bathocuproine (abbreviated as BCP), and 4,4' -bis (5-methylbenzoxazol-2-yl) stilbene (abbreviated as BzOs).

Examples of the polymer compound include poly [ (9, 9-dihexylfluorene-2, 7-diyl) -co- (pyridine-3, 5-diyl) ] (abbreviated as PF-Py), and poly [ (9, 9-dioctylfluorene-2, 7-diyl) -co- (2, 2 '-bipyridine-6, 6' -diyl) ] (abbreviated as PF-BPy).

The material has an electron mobility of 10 ^-6cm²/Vs or more. The electron transport layer may be made of a material other than the above materials as long as the electron transport property is higher than the hole transport property.

Electron injection layer

The electron injection layer is a layer containing a material having high electron injection properties. Examples of the electron injection layer include alkali metals such as lithium (Li) and cesium (Cs), alkaline earth metals such as magnesium (Mg), calcium (Ca) and strontium (Sr), rare earth metals such as europium (Eu) and ytterbium (Yb), and compounds containing these metals. Examples of such a compound include alkali metal oxides, alkali metal halides, alkali metal-containing organic complexes, alkaline earth metal oxides, alkaline earth metal halides, alkaline earth metal-containing organic complexes, rare earth metal oxides, rare earth metal halides, and rare earth metal-containing organic complexes. In addition, a plurality of these compounds may be used in combination.

In addition, a material containing an alkali metal, an alkaline earth metal, or a compound thereof in a material having electron-transporting property, specifically, a material containing magnesium (Mg) in Alq, or the like can be used. In this case, electron injection from the cathode can be performed more efficiently. Alternatively, a composite material in which an organic compound and an electron donor (donor) are mixed may be used for the electron injection layer. Such a composite material is excellent in electron injection property and electron transport property because the organic compound accepts electrons from the electron donor. In this case, the organic compound is preferably a material excellent in the transport of the received electrons, and specifically, for example, the above-mentioned material (metal complex, heteroaromatic compound, or the like) constituting the electron transport layer can be used. The electron donor may be any material that exhibits electron donating properties to an organic compound. Specifically, alkali metals, alkaline earth metals, and rare earth metals are preferable, and examples thereof include lithium, cesium, magnesium, calcium, erbium, ytterbium, and the like. The alkali metal oxide and alkaline earth metal oxide are preferable, and examples thereof include lithium oxide, calcium oxide, and barium oxide. In addition, a Lewis base such as magnesium oxide may be used. In addition, an organic compound such as tetrathiafulvalene (abbreviated as TTF) may be used.

Cathode electrode

The cathode preferably uses a metal, an alloy, a conductive compound, a mixture thereof, or the like having a small work function (specifically, 3.8eV or less). Specific examples of such cathode materials include alkali metals such as lithium (Li) and cesium (Cs), alkaline earth metals such as magnesium (Mg), calcium (Ca) and strontium (Sr), alloys containing the same (for example, mgAg and AlLi), rare earth metals such as europium (Eu) and ytterbium (Yb), alloys containing the same, and the like, which belong to the first group or the second group of the periodic table.

When forming a cathode using an alkali metal, an alkaline earth metal, or an alloy containing these metals, a vacuum vapor deposition method or a sputtering method may be used. In addition, when silver paste or the like is used, a coating method, an inkjet method, or the like may be used.

By providing the electron injection layer, the cathode can be formed using Al, ag, ITO, graphene, indium oxide-tin oxide containing silicon or silicon oxide, or other various conductive materials, regardless of the magnitude of the work function. These conductive materials may be formed into films by sputtering, inkjet, spin coating, or the like.

Insulating layer

Since an electric field is applied to an ultrathin film, a pixel defect due to leakage or short circuit is likely to occur in an organic EL element. In order to prevent this, an insulating layer formed of an insulating thin film layer may be interposed between the pair of electrodes.

Examples of materials that can be used for the insulating layer include aluminum oxide, lithium fluoride, lithium oxide, cesium fluoride, cesium oxide, magnesium fluoride, calcium oxide, calcium fluoride, aluminum nitride, titanium oxide, silicon oxide, germanium oxide, silicon nitride, boron nitride, molybdenum oxide, ruthenium oxide, and vanadium oxide. It is to be noted that a mixture or a laminate of these may be used.

Spacer layer

For example, when the fluorescent light-emitting layer and the phosphorescent light-emitting layer are laminated, the spacer layer is a layer provided between the fluorescent light-emitting layer and the phosphorescent light-emitting layer for the purpose of preventing excitons generated in the phosphorescent light-emitting layer from diffusing into the fluorescent light-emitting layer or adjusting carrier balance. In addition, a spacer layer may be disposed between the plurality of phosphorescent light emitting layers.

The spacer layer is preferably a material having both electron transport property and hole transport property because it is provided between the light emitting layers. In order to prevent diffusion of triplet energy in adjacent phosphorescent light emitting layers, the triplet energy is preferably 2.6eV or more. As a material for the spacer layer, the same materials as those described above for the hole transport layer can be mentioned.

Barrier layer

A blocking layer such as an electron blocking layer, a hole blocking layer, or an exciton blocking layer may be provided adjacent to the light emitting layer. The electron blocking layer refers to a layer that prevents electrons from leaking from the light emitting layer to the hole transporting layer, and the hole blocking layer refers to a layer that prevents holes from leaking from the light emitting layer to the electron transporting layer. The exciton blocking layer has a function of preventing excitons generated in the light emitting layer from diffusing to a peripheral layer, thereby blocking the excitons within the light emitting layer.

The layers of the organic EL element can be formed by a conventionally known vapor deposition method, a coating method, or the like. For example, the film can be formed by a vapor deposition method such as a vacuum vapor deposition method or a molecular beam vapor deposition method (MBE method), or a known method using a solution of a compound forming a layer, such as a coating method such as a dip coating method, a spin coating method, a casting method, a bar coating method, or a roll coating method.

The film thickness of each layer is not particularly limited, and in general, if the film thickness is too small, defects such as pinholes tend to occur, whereas if it is too large, high driving voltage is required and efficiency is deteriorated, so that it is usually 5nm to 10 μm, more preferably 10nm to 0.2 μm.

In the organic EL element having the hole transport layer having the 2-layer structure or the 3-layer structure of the present invention, the total thickness of the 1 st hole transport layer and the thickness of the 2 nd hole transport layer is preferably 30nm or more and 150nm or less, more preferably 40nm or more and 130nm or less.

In one embodiment of the present invention, the thickness of the 2 nd hole transport layer having a 2-layer structure or a 3-layer structure is preferably 5nm or more, more preferably 20nm or more, still more preferably 25nm or more, particularly preferably 35nm or more, and further preferably 100nm or less.

In one embodiment of the present invention, the thickness of the hole transport layer adjacent to the light-emitting layer is preferably 5nm or more, more preferably 20nm or more, still more preferably 25nm or more, particularly preferably 30nm or more, and further preferably 100nm or less.

In the organic EL element having the hole transport layer having the 2-layer structure or the 3-layer structure of the present invention, the ratio of the film thickness D2 of the 2 nd hole transport layer to the film thickness D1 of the 1 st hole transport layer is preferably 0.3< D2/D1<4.0, more preferably 0.5< D2/D1<3.5, still more preferably 0.75< D2/D1<3.0.

A preferred embodiment of the organic EL element of the present invention includes, for example:

(1) Organic EL element having hole transport layer of 2-layer structure

Embodiment 1 wherein the 2 nd hole transport layer contains an inventive compound and the 1 st hole transport layer does not contain an inventive compound;

embodiment 2 wherein the 1 st hole transport layer and the 2 nd hole transport layer each contain the inventive compound;

Embodiment 3 wherein the 1 st hole transport layer contains an inventive compound and the 2 nd hole transport layer does not contain an inventive compound;

(2) Organic EL element having hole transport layer of 3-layer structure

Embodiment 4 wherein the 1 st hole transport layer contains an inventive compound, the 2 nd hole transport layer, and the 3 rd hole transport layer do not contain an inventive compound;

embodiment 5 wherein the 2 nd hole transport layer contains an inventive compound, the 1 st hole transport layer, and the 3 rd hole transport layer do not contain an inventive compound;

Embodiment 6 wherein the 3 rd hole transport layer contains an inventive compound, the 1 st hole transport layer, and the 2 nd hole transport layer do not contain an inventive compound;

embodiment 7 wherein the 1 st hole transport layer and the 2 nd hole transport layer contain an inventive compound and the 3 rd hole transport layer does not contain an inventive compound;

embodiment 8 wherein the 1 st hole transport layer and the 3 rd hole transport layer contain an inventive compound and the 2 nd hole transport layer does not contain an inventive compound;

embodiment 10 wherein the 2 nd hole transport layer and the 3 rd hole transport layer contain an inventive compound and the 1 st hole transport layer does not contain an inventive compound;

the 1 st to 3 rd hole transport layers each include embodiment 10 of the compound of the present invention, and the like.

Electronic equipment

The organic EL element according to one embodiment of the present invention can be used for electronic devices such as a display device and a light-emitting device. Examples of the display device include a display member such as an organic EL panel module, a television, a mobile phone, a tablet pc, and a personal computer. Examples of the light emitting device include illumination and a vehicle lamp.

The organic EL element can be used for electronic devices such as display members such as organic EL panel modules, display devices such as televisions, mobile phones, and personal computers, and light emitting devices for lighting and vehicle lighting.

Examples

The present invention will be described in further detail with reference to the following examples, which are not intended to limit the scope of the invention.

Inventive Compounds used in the production of organic EL elements (I) of examples 1-3

[ Chemical formula 186]

Comparative compound used in production of organic EL element (I) of comparative examples 1 and 2

[ Chemical formula 187]

Other Compounds used in the production of organic EL elements (I) of examples 1 to 3 and comparative examples 1 and 2

[ Chemical formula 188]

Production of organic EL element (I)

Example 1 ]

A glass substrate (Geomatec Co., ltd.) having an ITO transparent electrode (anode) of 25 mm. Times.75 mm. Times.1.1 mm was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, and then to UV ozone cleaning for 30 minutes. The film thickness of ITO was 130nm.

The cleaned glass substrate with ITO transparent electrode was mounted on a substrate holder of a vacuum vapor deposition apparatus, and first, a hole injection layer having a film thickness of 10nm was formed by co-vapor deposition of a compound HT-1 and a compound HA so as to cover the transparent electrode on the surface on which the transparent electrode was formed. The mass ratio of compound HT-1 to compound HA (HT-1: HA) was 97:3.

Then, a1 st hole transport layer having a film thickness of 40nm was formed by vapor deposition of the compound HT-1 on the hole injection layer.

Next, the compound Inv-1 was vapor deposited on the 1 st hole transport layer to form a2 nd hole transport layer having a film thickness of 40 nm.

Then, a3 rd hole transport layer having a film thickness of 5nm was formed by vapor deposition of a compound HT-2 on the 2 nd hole transport layer.

Next, a 1 st light-emitting layer having a film thickness of 20nm was formed by co-vapor deposition of a compound BH-1 (host material) and a compound BD-1 (dopant material) on the 3 rd hole transport layer. The mass ratio of the compound BH-1 to the compound BD-1 (BH-1: BD-1) was 99:1.

Then, a1 st electron transport layer having a film thickness of 5nm was formed by vapor deposition of the compound ET-1 on the light-emitting layer.

Then, the 2 nd electron transport layer having a film thickness of 25nm was formed by co-depositing the compounds ET-2 and Liq on the 1 st electron transport layer. The mass ratio of the compound ET-2 to Liq (ET-2: liq) was 50:50.

Next, yb was deposited on the 2 nd electron transport layer to form an electron-injecting electrode having a film thickness of 1 nm.

Then, metal Al was deposited on the electron-injecting electrode to form a metal cathode having a film thickness of 50 nm.

The layer configuration of the organic EL element of example 1 thus obtained is shown below.

ITO(130)/HT-1：HA＝97：3(10)/HT-1(40)/Inv-1(40)/HT-2(5)/BH-1：BD-1＝99：1(20)/ET-1(5)/ET-2：Liq＝50：50(25)/Yb(1)/Al(50)

In the above layer structure, the numbers in brackets are film thickness (nm), and the ratio is the mass ratio.

< Examples 2 and 3>

An organic EL element (I) was produced in the same manner as in example 1, except that compound Inv-4 was used in example 2 in place of compound Inv-1, and compound Inv-5 was used in example 3 in place of compound Inv-1.

Comparative examples 1 and 2]

An organic EL element (I) was produced in the same manner as in example 1, except that a comparative compound Ref-1 was used in comparative example 1 in place of the compound Inv-1 and a comparative compound Ref-2 was used in comparative example 2 in place of the compound Inv-1.

Evaluation of organic EL element (I)

The driving voltage and external quantum efficiency of the obtained organic EL element (I) were measured.

(1) Measurement of drive Voltage

A voltage was applied to the organic EL element (I) so that the current density was 10mA/cm ², and the voltage (unit: V) at that time was measured. The results are shown in Table 1.

(2) Determination of External Quantum Efficiency (EQE)

The obtained organic EL element (I) was subjected to DC constant current driving at room temperature at a current density of 10mA/cm ². The luminance was measured by a luminance meter (a spectroluminance radiometer CS-1000 manufactured by Minolta corporation), and the external quantum efficiency (%) was measured from the result. The results are shown in Table 1.

TABLE 1

Inventive Compounds used in the production of organic EL elements (II) of examples 4 to 7

[ Chemical formula 189]

Comparative compound used for producing organic EL element (II) of comparative example 2

[ Chemical formula 190]

Other Compounds used in the production of organic EL elements (II) of examples 4 to 7 and comparative example 3

[ Chemical formula 191]

Production of organic EL element (II)

Example 4 ]

The glass substrate with the ITO transparent electrode after cleaning was mounted on a substrate holder of a vacuum vapor deposition apparatus, and first, a hole injection layer having a film thickness of 10nm was formed by co-vapor deposition of a compound Inv-1 and a compound HA so as to cover the transparent electrode on the surface on which the transparent electrode was formed. The mass ratio of compound Inv-1 to compound HA (Inv-1: HA) was 97:3.

Next, the compound Inv-1 was vapor deposited on the hole injection layer to form a1 st hole transport layer having a film thickness of 80 nm.

Then, a compound HT-4 was deposited on the 1 st hole transport layer to form a 2 nd hole transport layer having a film thickness of 10 nm.

Next, a light-emitting layer having a film thickness of 25nm was formed by co-vapor deposition of a compound BH-2 (host material) and a compound BD-2 (dopant material) on the 2 nd hole transport layer. The mass ratio of the compound BH-2 to the compound BD-2 (BH-2: BD-2) was 96:4.

Then, a1 st electron transport layer having a film thickness of 10nm was formed by vapor deposition of compound ET-3 on the light-emitting layer.

Then, a compound ET-4 was deposited on the 1 st electron transport layer to form a 2 nd electron transport layer having a film thickness of 15nm.

Next, liF was deposited on the 2 nd electron transport layer to form an electron injecting electrode having a film thickness of 1 nm.

The layer constitution of the organic EL element (II) of example 4 thus obtained is shown below.

ITO(130)/Inv-1:HA=97:3(10)/Inv-1(80)/HT-4(10)/BH-2:BD-2=96:4(25)/ET-3(10)/ET-4(15)/LiF(1)/Al(50)

< Examples 5 to 7>

An organic EL element (II) was produced in the same manner as in example 4, except that compound Inv-6 was used in example 5 in place of compound Inv-1, compound Inv-7 was used in example 6 in place of compound Inv-1, and compound Inv-8 was used in example 7 in place of compound Inv-1.

Comparative example 3 ]

An organic EL element (II) was produced in the same manner as in example 4, except that the comparative compound Ref-2 was used in place of the inventive compound Inv-1.

Evaluation of organic EL element (II)

The driving voltage and external quantum efficiency of the obtained organic EL element (II) were measured by the same method as in the organic EL element (I). The results are shown in Table 2.

TABLE 2

Inventive Compounds used in the production of organic EL elements (III) of examples 8 to 17

[ Chemical formula 192]

Comparative compounds used in the production of organic EL elements (III) of comparative examples 4 and 5

[ Chemical formula 193]

Other Compounds used in the manufacture of organic EL elements of examples 8 to 17 and comparative examples 4 and 5

[ Chemical formula 194]

[ Chemical formula 195]

Fabrication of organic EL element (III)

Example 8 ]

Next, a compound Inv-2 was vapor deposited on the 1 st hole transport layer to form a2 nd hole transport layer having a film thickness of 45 nm.

Then, a3 rd hole transport layer having a film thickness of 5nm was formed by vapor deposition of a compound HT-6 on the 2 nd hole transport layer.

Next, a 1 st light-emitting layer having a film thickness of 5nm was formed by co-vapor deposition of a compound BH-1 (host material) and a compound BD-3 (dopant material) on the 3 rd hole transport layer. The mass ratio of the compound BH-1 to the compound BD-3 (BH-1: BD-3) was 99:1.

Then, a 2 nd light-emitting layer having a film thickness of 20nm was formed by co-vapor deposition of a compound BH-5 (host material) and a compound BD-3 (dopant material) on the 1 st light-emitting layer. The mass ratio of the compound BH-5 to the compound BD-3 (BH-5: BD-3) was 99:1.

Then, a1 st electron transport layer having a film thickness of 5nm was formed by vapor deposition of a compound ET-1 on the 2 nd light-emitting layer.

Then, the 2 nd electron transport layer having a film thickness of 31nm was formed by co-depositing the compounds ET-2 and Liq on the 1 st electron transport layer. The mass ratio of the compound ET-2 to Liq (ET-2: liq) was 50:50.

Subsequently, liq was deposited on the 2 nd electron transport layer to form an electron-injecting electrode having a film thickness of 1 nm.

Then, metal Al was deposited on the electron-injecting electrode to form a metal cathode having a film thickness of 80 nm.

The layer constitution of the organic EL element (IH) of example 8 thus obtained is shown below.

ITO(130)/HT-1：HA＝97：3(10)/HT-1(40)/Inv-2(45)/HT-6(5)/BH-1：BD-3＝99：1(5)/BH-5：BD-3＝99：1(20)/ET-1(5)/ET-2：Liq＝50：50(31)/Liq(1)/Al(80)

Example 9 ]

An organic EL element (III) was produced in the same manner as in example 8, except that the compound Inv-3 was used in place of the compound Inv-2.

Example 10 ]

An organic EL element (III) was produced in the same manner as in example 8, except that the compound Inv-9 was used in place of the compound Inv-2.

Example 11 ]

An organic EL element (III) was produced in the same manner as in example 8, except that the compound BD-4 was used instead of the compound BD-3.

Example 12 ]

An organic EL element (III) was produced in the same manner as in example 8 except that compound BH-4 (host material), compound BH-7 (host material) and compound BD-3 (dopant material) were co-deposited on the 1 st light-emitting layer to form a2 nd light-emitting layer having a film thickness of 20nm, instead of co-depositing compound BH-5 (host material) and compound BD-3 (dopant material) to form a2 nd light-emitting layer having a film thickness of 20 nm. The mass ratio of the compound BH-4 to the compound BH-7 (BH-4: BH-7) was 70:30, and the concentration of the compound BD-3 was 1% by mass with respect to the entire 2 nd light-emitting layer.

Example 13 ]

An organic EL element (III) was produced in the same manner as in example 12 except that the mass ratio of the compound BH-4 to the compound BH-7 (BH-4: BH-7) was set to 50:50.

Example 14 ]

An organic EL element (III) was produced in the same manner as in example 12 except that the mass ratio of the compound BH-4 to the compound BH-7 (BH-4: BH-7) was set to 30:70.

Example 15 ]

An organic EL element (IH) was fabricated in the same manner as in example 12 except that the mass ratio of the compound BH-4 to the compound BH-7 (BH-4: BH-7) was set to 20:80.

Example 16 ]

Next, a1 st light-emitting layer having a film thickness of 5nm was formed by co-vapor deposition of a compound BH-3 (host material) and a compound BD-5 (dopant material) on the 3 rd hole transport layer. The mass ratio of the compound BH-3 to the compound BD-5 (BH-3: BD-5) was 99:1.

Then, a 2 nd light-emitting layer having a film thickness of 20nm was formed by co-vapor deposition of a compound BH-6 (host material) and a compound BD-5 (dopant material) on the 1 st light-emitting layer. The mass ratio of the compound BH-6 to the compound BD-5 (BH-6: BD-5) was 99:1.

Then, a1 st electron transport layer having a film thickness of 10nm was formed by vapor deposition of a compound ET-3 on the 2 nd light-emitting layer.

The layer constitution of the organic EL element (III) of example 16 thus obtained is shown below.

ITO(130)/HT-1：HA＝97：3(10)/HT-1(40)/Inv-2(45)/HT-2(5)/BH-3：BD-5＝99：1(5)/BH-6：BD-5＝99：1(20)/ET-3(10)/ET-4(15)/Al(80)

< Example 17>

An organic EL element (III) was produced in the same manner as in example 8, except that the compound HT-5 was used in place of the compound HT-1 and the compound Inv-1 was used in place of the compound Inv-2.

Comparative examples 4 and 5 ]

An organic EL element (III) was produced in the same manner as in example 8, except that the comparative compound Ref-3 or the comparative compound Ref-4 was used in place of the compound Inv-2.

Evaluation of organic EL element (III)

The external quantum efficiency of the obtained organic EL element (III) was measured by the same method as that of the organic EL element (I). The results are shown in Table 3.

(3) 95% Lifetime (LT 95)

The obtained organic EL element (III) was subjected to dc constant current driving at a current density of 50mA/cm ², and the time until the luminance was reduced to 95% of the initial luminance was measured and was regarded as 95% lifetime (LT 95). The results are shown in Table 3.

TABLE 3

Inventive Compounds used in the production of organic EL elements (IV) of examples 18 to 34

[ Chemical formula 196]

Comparative compound used for producing organic EL element (IV) of comparative example 6

[ Chemical formula 197]

Other compounds used in the production of the organic EL elements of examples 18 to 34 and comparative example 6

[ Chemical formula 198]

[ Chemical formula 199]

Fabrication of organic EL element (IV)

Example 18 ]

The glass substrate with the ITO transparent electrode after cleaning was mounted on a substrate holder of a vacuum vapor deposition apparatus, and first, a hole injection layer having a film thickness of 10nm was formed by co-vapor deposition of the compound Inv-2 and the compound HA so as to cover the transparent electrode on the surface on which the transparent electrode was formed. The mass ratio of compound Inv-2 to compound HA (Inv-2: HA) was 97:3.

Next, the compound Inv-2 was vapor deposited on the hole injection layer to form a1 st hole transport layer having a film thickness of 85 nm.

Then, a compound HT-6 was deposited on the 1 st hole transport layer to form a 2 nd hole transport layer having a film thickness of 5 nm.

Next, a1 st light-emitting layer having a film thickness of 5nm was formed by co-vapor deposition of a compound BH-1 (host material) and a compound BD-3 (dopant material) on the 2 nd hole transport layer. The mass ratio of the compound BH-1 to the compound BD-3 (BH-1: BD-3) was 99:1.

Then, a 2 nd light-emitting layer having a film thickness of 15nm was formed by co-vapor deposition of compound BH-5 (host material) and compound BD-3 (dopant material) on the 1 st light-emitting layer. The mass ratio of the compound BH-5 to the compound BD-3 (BH-5: BD-3) was 99:1.

The layer constitution of the organic EL element (IV) of example 18 thus obtained is shown below.

ITO(130)/Inv-2：HA＝97：3(10)/Inv-2(85)/HT-6(5)/BH-1：BD-3＝99：1(5)/BH-5：BD-3＝99：1(15)/ET-1(5)/ET-2：Liq＝50：50(31)/Liq(1)/Al(80)

< Examples 19 to 21>

An organic EL element (IV) was produced in the same manner as in example 18, except that compound Inv-4 was used in example 19 in place of compound Inv-2, compound Inv-3 was used in example 20 in place of compound Inv-2, and compound Inv-9 was used in example 21 in place of compound Inv-2.

Example 22 ]

An organic EL element (IV) was produced in the same manner as in example 18, except that the compound HT-7 was used instead of the compound HT-6.

Example 23 ]

An organic EL element (IV) was produced in the same manner as in example 18, except that the compound BH-9 was used instead of the compound BH-5.

Example 24 ]

An organic EL element (IV) was produced in the same manner as in example 18, except that the compound BH-3 was used in place of the compound BH-1, the compound BH-6 was used in place of the compound BH-5, and the compound BD-4 was used in place of the compound BD-3.

Example 25 ]

The cleaned glass substrate with the ITO transparent electrode was mounted on a substrate holder of a vacuum vapor deposition apparatus, and first, a hole injection layer having a film thickness of 10nm was formed by co-vapor deposition of the compound Inv-2 and the compound HA so as to cover the transparent electrode on the surface on which the transparent electrode was formed. The mass ratio of compound Inv-2 to compound HA (Inv-2: HA) was 97:3.

Next, the 1 st hole transport layer having a film thickness of 85nm was formed by vapor deposition of the inventive compound Inv-2 on the hole injection layer.

Then, a compound HT-8 was deposited on the 1 st hole transport layer to form a 2 nd hole transport layer having a film thickness of 5 nm.

Next, a1 st light-emitting layer having a film thickness of 5nm was formed by co-vapor deposition of a compound BH-3 (host material) and a compound BD-5 (dopant material) on the 2 nd hole transport layer. The mass ratio of the compound BH-3 to the compound BD-5 (BH-3: BD-5) was 99:1.

Then, a 2 nd light-emitting layer having a film thickness of 15nm was formed by co-vapor deposition of a compound BH-6 (host material) and a compound BD-5 (dopant material) on the 1 st light-emitting layer. The mass ratio of the compound BH-6 to the compound BD-5 (BH-6: BD-5) was 99:1.

Then, metal Al was deposited on the 2 nd electron transport layer to form a metal cathode having a film thickness of 80 nm.

The layer constitution of the organic EL element (IV) of example 25 thus obtained is shown below.

ITO(130)/Inv-2：HA＝97：3(10)/Inv-2(85)/HT-8(5)/BH-3：BD-5＝99：1(5)/BH-6：BD-5＝99：1(15)/ET-3(10)/ET-4(15)/Al(80)

Example 26 ]

An organic EL element (IV) was produced in the same manner as in example 18, except that the compound HT-9 was used instead of the compound HT-6.

Example 27 ]

An organic EL element (IV) was produced in the same manner as in example 18, except that the compound HT-10 was used instead of the compound HT-6.

Example 28 ]

An organic EL element (IV) was fabricated in the same manner as in example 18, except that compound BH-4 (host material), compound BH-7 (host material), and compound BD-3 (dopant material) were co-deposited on the 1 st light-emitting layer to form a 2 nd light-emitting layer having a film thickness of 20nm, instead of co-depositing compound BH-5 (host material) and compound BD-3 (dopant material) to form a 2 nd light-emitting layer having a film thickness of 15 nm. The mass ratio of the compound BH-4 to the compound BH-7 (BH-4: BH-7) was 70:30, and the concentration of the compound BD-3 was 1% by mass with respect to the entire 2 nd light-emitting layer.

< Example 29>

An organic EL element (IV) was produced in the same manner as in example 28 except that compound HT-7 was used instead of compound HT-6, and the mass ratio of compound BH-4 to compound BH-7 (BH-4: BH-7) was set at 60:40.

Example 30 ]

An organic EL element (IV) was fabricated in the same manner as in example 18 except that compound BH-8 (host material), compound BH-5 (host material), and compound BD-3 (dopant material) were co-deposited on the 1 st light-emitting layer to form a 2 nd light-emitting layer having a film thickness of 20nm, instead of co-depositing compound BH-5 (host material) and compound BD-3 (dopant material) to form a 2 nd light-emitting layer having a film thickness of 15 nm. The mass ratio of the compound BH-8 to the compound BH-5 (BH-8: BH-5) was 70:30, and the concentration of the compound BD-3 was 1% by mass with respect to the entire 2 nd light-emitting layer.

< Examples 31 to 34>

An organic EL element (IV) was produced in the same manner as in example 18, except that compound HT-6 was replaced with compound HT-11 in example 31, compound HT-4 in example 32, compound HT-6 was replaced with compound HT-12 in example 33, and compound HT-13 in example 34, respectively, was replaced with compound HT-6.

Comparative example 6 ]

An organic EL element (IV) was produced in the same manner as in example 17, except that Ref-5 was used instead of Inv-2 and HT-13 was used instead of HT-6.

Evaluation of organic EL element (IV)

The external quantum efficiency of the obtained organic EL element (IV) was measured by the same method as the organic EL element (I), and the lifetime of the organic EL element (IV) was measured by the same method as the organic EL element (III). The results are shown in Table 4.

TABLE 4

As is clear from the results of tables 1 to 4, the compounds Inv-1 to Inv-9 provide organic EL elements having a low driving voltage and a high external quantum efficiency as compared with the comparative compounds Ref-1 to Ref-5.

The inventive compounds Inv-1 to Inv-9 synthesized in the Synthesis examples

[ Chemical formula 200]

Synthesis of intermediate example 1 Synthesis of intermediate A

[ Chemical formula 201]

A mixture of 7.40g (22.1 mmol) of 2-bromo-9-phenyl-9-methyl-9H-fluorene, 5.08g (23.2 mmol) of 2- (4, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) aniline, 0.404g (0.441 mmol) of tris (dibenzylideneacetone) dipalladium (0), 0.845g (1.77 mmol) of 2-dicyclohexylphosphino (phosphino) -2',4',6' -triisopropylbiphenyl (XPhos), 33mL of 2M potassium phosphate in water and 110mL of 1, 4-dioxane was stirred at 80℃for 7 hours. The reaction mixture was cooled to room temperature, and then concentrated under reduced pressure. The obtained solid was purified by silica gel column chromatography to obtain 7.67g of a white solid (intermediate A-1). The yield was 99%.

A mixture of 7.67g (22.1 mmol) of intermediate A-1, 5.15g (22.1 mmol) of 2-bromobiphenyl, 0.406g (0.443 mmol) of tris (dibenzylideneacetone) dipalladium (0), 0.552g (0.886 mmol) of BINAP, 2.343g (24.4 mmol) of sodium tert-butoxide, and 111mL of toluene was stirred at 100℃for 30 hours under argon. The reaction mixture was cooled to room temperature, and then concentrated under reduced pressure. The obtained solid was purified by silica gel column chromatography to obtain 6.93g of a white solid. The yield thereof was found to be 63%.

Intermediate Synthesis example 2 Synthesis of intermediate B

[ Chemical formula 202]

A mixture of 9.05g (27.0 mmol) of 2-bromo-9-phenyl-9-methyl-9H-fluorene, 5.07g (32.4 mmol) of 2-chlorobenzeneboronic acid, [1,1' -bis (diphenylphosphino) ferrocene ] palladium (II) dichloride dichloromethane adduct 0.395g (0.540 mmol), 40.5mL of 2M aqueous sodium carbonate solution, and 135mL of DME was refluxed at the boiling point for 7 hours under argon. The reaction mixture was cooled to room temperature, and then concentrated under reduced pressure. The obtained solid was purified by silica gel column chromatography to obtain 9.82g of a white solid. The yield was 99%.

Intermediate Synthesis example 3 Synthesis of intermediate C

[ Chemical formula 203]

The same procedure was conducted except that bromobenzene was used instead of 2-bromobiphenyl in the synthesis of intermediate a, to obtain a white solid. The yield was 75%.

Synthesis example 1 Synthesis of Compound Inv-1

[ Chemical formula 204]

A mixture of 5.93g (11.9 mmol) of intermediate A, 3.89g (14.2 mmol) of 2-bromo-9, 9-dimethyl-9H-fluorene, 0.217g (0.237 mmol) of tris (dibenzylideneacetone) dipalladium (0), 0.275g (0.949 mmol) of tris (t-butylscaly tetrafluoroborate, 23.7mL of lithium bis (trimethylsilyl) amide (1M toluene solution) and 119mL of xylene was refluxed for 7 hours under argon. After cooling the reaction solution to room temperature, concentration was performed under reduced pressure. The obtained residue was purified by silica gel column chromatography and recrystallization to obtain 3.29g of a white solid. The yield was 40%.

Mass spectrometry analysis was performed on the obtained substance, which gave compound Inv-1, m/e=692 with respect to molecular weight 691.92.

Synthesis example 2 Synthesis of Compound Inv-2

[ Chemical formula 205]

A mixture of intermediate A-13.47g (10.0 mmol), 2-bromo-9, 9-dimethyl-9H-fluorene 6.28g (23.0 mmol), tris (dibenzylideneacetone) dipalladium (0) 0.366g (0.400 mmol), tris (t-butylscaly tetrafluoroborate 0.464g (1.60 mmol), sodium t-butoxide 2.69g (28.0 mmol) and xylene 100mL was stirred at 110℃for 7 hours under argon. The reaction mixture was cooled to room temperature, and then concentrated under reduced pressure. The obtained solid was purified by silica gel column chromatography to obtain 1.88g of a white solid. The yield was 26%.

Mass spectrometry analysis was performed on the obtained substance, which resulted in compound Inv-2, m/e=732 with respect to molecular weight 731.98.

Synthesis example 3 Synthesis of Compound Inv-3

[ Chemical formula 206]

The same operations were repeated except for using 4-bromobiphenyl instead of 2-bromo-9, 9-dimethyl-9H-fluorene in Synthesis example 2, to obtain 3.51g of a white solid. The yield was 54%.

Mass spectrometry analysis was performed on the obtained substance, which resulted in compound Inv-3, m/e=652 with respect to molecular weight 651.85.

Synthesis example 4 Synthesis of Compound Inv-4

[ Chemical formula 207]

A mixture of 2.43g (8.51 mmo 1), 3.44g (9.37 mmo 1) of intermediate B, 0.156g (0.170 mmo) of tris (dibenzylideneacetone) dipalladium (0), 0.280g (0.68mmo 1) of 2-dicyclohexylphosphino (phosphino) -2',6' -dimethoxybiphenyl (SPhos), 1.15g (11.9 mmo 1) of sodium t-butoxide and 85mL of xylene was stirred at 110℃for 7 hours under argon. The reaction mixture was cooled to room temperature, and then concentrated under reduced pressure. The obtained solid was purified by silica gel column chromatography to obtain 1.88g of a white solid. The yield was 35%.

Mass spectrometry analysis was performed on the obtained substance, which resulted in compound Inv-4, m/e=616 with respect to molecular weight 615.82.

Synthesis example 5 Synthesis of Compound Inv-5

[ Chemical formula 208]

The same procedure was repeated except for using intermediate D instead of intermediate B and intermediate C instead of 9, 9-dimethyl-N-phenyl-9H-fluoren-2-amine in synthesis example 4, to obtain a white solid. The yield was 62%.

Mass spectrometry analysis was performed on the obtained substance, which resulted in compound Inv-5, m/e=692 with respect to molecular weight 691.92.

Synthesis example 6 Synthesis of Compound Inv-6

[ Chemical formula 209]

The same procedure was repeated except for using N- [1,1' -biphenyl ] -4-yl-9, 9-dimethyl-9H-fluoren-2-amine instead of 9, 9-dimethyl-N-phenyl-9H-fluoren-2-amine in synthesis example 4, to obtain a white solid. The yield was 48%.

Mass spectrometry analysis was performed on the obtained substance, which resulted in compound Inv-6, m/e=692 with respect to molecular weight 691.92.

Synthesis example 7 Synthesis of Compound Inv-7

[ Chemical formula 210]

The same procedure was repeated except for using intermediate E instead of 9, 9-dimethyl-N-phenyl-9H-fluoren-2-amine in synthesis example 4, to obtain a white solid. The yield thereof was found to be 47%.

Mass spectrometry analysis was performed on the obtained substance, which resulted in compound Inv-7, m/e=754 with respect to molecular weight 753.99.

Synthesis example 8 Synthesis of Compound Inv-8

[ Chemical formula 211]

The same procedure was repeated except for using intermediate F instead of 9, 9-dimethyl-N-phenyl-9H-fluoren-2-amine in synthesis example 4, to obtain a white solid. The yield was 55%.

Mass spectrometry analysis was performed on the obtained substance, which resulted in compound Inv-8, m/e=768 with respect to molecular weight 767.97.

Synthesis example 9 Synthesis of Compound Inv-9

[ Chemical formula 212]

The same procedure was repeated except for using bis ([ 1,1' -biphenyl ] -4-yl-d 9) amine instead of 9, 9-dimethyl-N-phenyl-9H-fluoren-2-amine in synthesis example 4, to obtain a white solid. The yield was 65%.

Mass spectrometry analysis was performed on the obtained substance, which resulted in compound Inv-9, m/e=670 with respect to molecular weight 669.96.

Symbol description

1. 11, 12 Organic EL element

2. Substrate board

3. Anode

4. Cathode electrode

5. Light-emitting layer

5A 1 st light-emitting layer

5B No. 2 light-emitting layer

6. Hole transport region (hole transport layer)

6A hole injection layer

6B 1 st hole transport layer

6C No. 2 hole transport layer

6D 3 rd hole transport layer

7. Electron transport region (electron transport layer)

7A 1 st electron transport layer

7B 2 nd electron transport layer

10. 20, 30 Light emitting unit

Claims

1. A compound represented by the following formula (1),

In the formula (1), the components are as follows,

N ^＊ is a central nitrogen atom,

One of R ^a and R ^b is a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms and the other is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms or a substituted or unsubstituted heterocyclic group having 5 to 30 ring-forming atoms,

Wherein R ^a and R ^b are optionally bonded to each other to form a substituted or unsubstituted ring,

1 Selected from R ²、R³、R⁶ and R ⁷ is a single bond bonded to 1, R ¹、R⁴、R⁵、R⁸ and R ²、R³、R⁶ and R ⁷ which are not single bonds bonded to 1 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 15 ring-forming carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms or a substituted or unsubstituted heterocyclic group having 5 to 13 ring-forming carbon atoms,

Adjacent 2 selected from R ¹、R⁴、R⁵、R⁸ and R ²、R³、R⁶ and R ⁷ which are not the single bond are not bonded to each other and thus do not form a ring,

R ¹¹～R¹⁴ is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms or a substituted or unsubstituted aryl group having 6 to 18 ring-forming carbon atoms,

Adjacent 2 selected from R ¹¹～R¹⁴ are not bonded to each other and thus do not form a ring,

L ¹～L⁴ is independently a single bond or a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms,

Ar ¹ and Ar ² are groups represented by any one of the following formulas (1 a) to (1 g),

In the formula (1 a), the amino acid sequence of the formula (1 a),

*21 Is a bonding position with L ¹ or L ²,

1 Selected from R ¹⁰¹～R¹⁰⁵ is a single bond with x 22, 1 selected from R ¹⁰⁶～R¹¹⁰ is a single bond with x 23, 1 selected from R ¹¹¹～R¹¹⁵ is a single bond with x 24,

R ¹⁰¹～R¹¹⁵ other than the single bond is each independently a hydrogen atom, an unsubstituted alkyl group having 1 to 10 carbon atoms or an unsubstituted aryl group having 6 to 12 ring-forming carbon atoms,

Adjacent 2 selected from R ¹⁰¹～R¹⁰⁵ which is not the single bond are not bonded to each other and thus do not form a ring,

Adjacent 2 selected from R ¹⁰⁶～R¹¹⁰ which is not the single bond are not bonded to each other and thus do not form a ring,

Adjacent 2 selected from R ¹¹¹～R¹¹⁵ which is not the single bond are not bonded to each other and thus do not form a ring,

M is 0 or 1, n is 0 or 1,1 is 0 or 1,

R ¹¹⁶～R¹²⁰ is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 13 ring-forming carbon atoms,

Adjacent 2 selected from R ¹¹⁶～R¹²⁰ are not bonded to each other and thus do not form a ring,

In the formula (1 b), the amino acid sequence,

*25 Is the bonding position with L ¹ or L ²,

1 Selected from R ¹²¹～R¹²⁸ is a single bond with 26,

R ¹²¹～R¹²⁸ other than the single bond is each independently a hydrogen atom, an unsubstituted alkyl group having 1 to 10 carbon atoms or an unsubstituted aryl group having 6 to 12 ring-forming carbon atoms,

Adjacent 2 selected from R ¹²¹～R¹²⁸ which is not the single bond are not bonded to each other and thus do not form a ring,

When L ² is p-phenylene and Ar ² is represented by formula (1 b), 1 selected from R ¹²¹、R¹²⁴、R¹²⁵ and R ¹²⁸ in the group represented by formula (1 b) bonded to the p-phenylene is a single bond bonded to 26,

In the formula (1 c), the amino acid sequence,

*27 Is the bonding position with L ¹ or L ²,

1 Selected from R ¹³¹～R¹⁴⁰ is a single bond to 28,

R ¹³¹～R¹⁴⁰ other than the single bond is each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms,

Adjacent 2 selected from R ¹³¹～R¹⁴⁰ which is not the single bond are not bonded to each other and thus do not form a ring,

In the formula (1 d), the amino acid sequence of the compound,

*29 Is the bonding position with L ¹ or L ²,

1 Selected from R ¹⁴¹～R¹⁵² is a single bond with 30,

R ¹⁴¹～R¹⁵² other than the single bond is each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms,

Adjacent 2 selected from R ¹⁴¹～R¹⁵² other than the single bond are not bonded to each other and thus do not form a ring structure,

In the formula (1 e), the amino acid sequence of the compound,

*31 Is the bonding position with L ¹ or L ²,

1 Selected from R ¹⁶¹～R¹⁶⁵ is a single bond with x 32, another 1 selected from R ¹⁶¹～R¹⁶⁵ is a single bond with x 33,

R ¹⁶¹～R¹⁶⁵ which is not the single bond with x 32 or the single bond with x 33 is independently hydrogen atom, unsubstituted alkyl group with 1-10 carbon atoms or unsubstituted phenyl group,

Adjacent 2 of R ¹⁶¹～R¹⁶⁵ selected from a single bond not bonded to x 32 nor a single bond not bonded to x 33 are not bonded to each other and thus do not form a ring,

R ¹⁷¹～R¹⁷⁵ and R ¹⁸¹～R¹⁸⁵ are each independently a hydrogen atom or an unsubstituted alkyl group having 1 to 10 carbon atoms,

Adjacent 2 selected from R ¹⁷¹～R¹⁷⁵ are optionally bonded to each other to form 1 or more unsubstituted benzene rings, or are not bonded to each other to form a ring,

Adjacent 2 selected from R ¹⁸¹～R¹⁸⁵ are optionally bonded to each other to form 1 or more unsubstituted benzene rings, or are not bonded to each other to form a ring,

In the formula (1 f), the amino acid sequence,

*34 Is the bonding position with L ¹ or L ²,

X is an oxygen atom, a sulfur atom or NR ^A,

1 Selected from R ¹⁹¹～R¹⁹⁸ and RA is a single bond to 35,

R ^A which is not the single bond is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms,

R ¹⁹¹～R¹⁹⁸ which is not a single bond is each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 13 ring-forming atoms,

Adjacent 2 selected from R ¹⁹¹～R¹⁹⁸ other than the single bond are optionally bonded to each other to form 1 or more unsubstituted benzene rings, or are not bonded to each other to form a ring,

In the formula (1 g), the components are as follows,

*36 Is the bonding position with L ¹ or L ²,

1 Selected from R ^B、R^C and R ²⁰¹～R²⁰⁸ is a single bond to 37,

R ^B and R ^C which are not single bonds are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms or a substituted or unsubstituted heterocyclic group having 5 to 13 ring-forming carbon atoms,

RB and RC which are not said single bond are optionally bonded to each other to form a substituted or unsubstituted ring,

R ²⁰¹～R²⁰⁸ which is not a single bond is each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 13 ring-forming atoms,

Adjacent 2 selected from R ²⁰¹～R²⁰⁸ which is not the single bond are not bonded to each other and thus do not form a ring.

2. The compound according to claim 1, wherein,

One of R ^a and R ^b is a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms and the other is a substituted or unsubstituted phenyl group.

3. The compound according to claim 1 or 2, wherein,

R ² or R ⁷ is a single bond to x 1.

4. A compound according to any one of claim 1 to 3,

L ³ is a single bond.

5. The compound according to any one of claim 1 to 4, wherein,

L ⁴ is a single bond.

6. The compound according to any one of claims 1 to 5, wherein,

At least one of Ar ¹ and Ar ² is a group represented by the formula (1 a) or (1 g).

7. The compound according to any one of claims 1 to 6, wherein,

Ar ¹ or Ar ² is a group represented by the formula (1 a), and the group represented by the formula (1 a) satisfies at least 1 item among the following (i) to (iii),

(I) R ¹⁰¹ or R ¹⁰⁵ is a single bond to 22

(Ii) R ¹⁰⁶ or R ¹¹⁰ is a single bond to 23

(Iii) R ¹¹¹ or R ¹¹⁵ is a single bond to x 24.

8. The compound according to any one of claims 1 to 7, wherein,

Ar ¹ or Ar ² is a group represented by the formula (1 g), and in the group represented by the formula (1 g), RB and R ^C are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms or a substituted or unsubstituted phenyl group.

9. The compound according to any one of claim 1 to 8, wherein,

Ar ¹ or Ar ² is a group represented by the formula (1 g), and in the group represented by the formula (1 g), R2 ⁰² or R2 ⁰⁷ is a single bond to 37.

10. The compound according to any one of claim 1 to 9, wherein,

L ¹ and L ² are each independently a single bond or an arylene group having 6 to 12 ring-forming carbon atoms.

11. The compound of any one of claims 1-10, comprising at least 1 deuterium atom.

12. A material for an organic electroluminescent element, comprising the compound according to any one of claims 1 to 11.

13. A hole transport layer material comprising the compound according to any one of claims 1 to 11.

14. An organic electroluminescent element having a cathode, an anode, and an organic layer between the cathode and the anode, the organic layer comprising a light-emitting layer, at least 1 layer of the organic layer comprising the compound of any one of claims 1 to 11.

15. The organic electroluminescent element according to claim 14, wherein,

The organic layer includes a hole transport region between the anode and the light emitting layer, the hole transport region including the compound.

16. The organic electroluminescent element according to claim 15, wherein,

The hole transport region includes a1 st hole transport layer on the anode side and a2 nd hole transport layer on the cathode side, one or both of the 1 st hole transport layer and the 2 nd hole transport layer including the compound.

17. The organic electroluminescent element according to claim 16, wherein,

The light-emitting layer is directly connected with the 2 nd hole transport layer.

18. The organic electroluminescent element as claimed in claim 16 or 17, wherein,

The total thickness of the 1 st hole transport layer and the thickness of the 2 nd hole transport layer is 30nm to 150 nm.

19. The organic electroluminescent device as claimed in any one of claims 14 to 18, wherein,

The light-emitting layer is a single layer.

20. The organic electroluminescent device as claimed in any one of claims 14 to 19, wherein,

The light-emitting layer contains a light-emitting compound that emits fluorescence having a main peak wavelength of 500nm or less.

21. The organic electroluminescent device as claimed in any one of claims 14 to 20, wherein,

The light emitting layer includes a fluorescent dopant material.

22. An electronic device comprising the organic electroluminescent element according to any one of claims 14 to 21.