WO2019177043A1 - アニリン誘導体およびその利用 - Google Patents
アニリン誘導体およびその利用 Download PDFInfo
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- WO2019177043A1 WO2019177043A1 PCT/JP2019/010345 JP2019010345W WO2019177043A1 WO 2019177043 A1 WO2019177043 A1 WO 2019177043A1 JP 2019010345 W JP2019010345 W JP 2019010345W WO 2019177043 A1 WO2019177043 A1 WO 2019177043A1
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- 0 CC1(*)C=CC(c2c(*3N(*)*)cccc2)=C3C=C1 Chemical compound CC1(*)C=CC(c2c(*3N(*)*)cccc2)=C3C=C1 0.000 description 6
- QZHXKQKKEBXYRG-UHFFFAOYSA-N Nc(cc1)ccc1Nc(cc1)ccc1N Chemical compound Nc(cc1)ccc1Nc(cc1)ccc1N QZHXKQKKEBXYRG-UHFFFAOYSA-N 0.000 description 1
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- H10K50/16—Electron transporting layers
- H10K50/165—Electron transporting layers comprising dopants
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- H10K85/633—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
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- H10K85/636—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
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Definitions
- the present invention relates to an aniline derivative and use thereof.
- a charge transporting thin film made of an organic compound is used as a light emitting layer or a charge injection layer.
- the hole injection layer is responsible for charge transfer between the anode and the hole transport layer or the light emitting layer, and plays an important function to achieve low voltage driving and high luminance of the organic EL element.
- the method of forming the hole injection layer is roughly divided into a dry process typified by vapor deposition and a wet process typified by spin coating. Compared with these processes, the wet process is flatter in a larger area. A highly efficient thin film can be produced efficiently.
- the present invention as well as the technology of the above-mentioned patent document that has been developed so far, exhibits good solubility in organic solvents and has excellent luminance characteristics when applied to a hole injection layer after being thinned.
- An object is to provide a novel aniline derivative capable of realizing an EL element.
- an aniline derivative having a predetermined silyl group on the nitrogen atom of the carbazole group has excellent solubility in an organic solvent.
- a thin film exhibiting high charge transportability can be obtained from a varnish prepared by dissolving in an organic solvent, and that a high brightness element can be obtained when the thin film is applied to a hole injection layer of an organic EL element.
- the headline and the present invention were completed.
- R 1 to R 5 are, independently of one another, a hydrogen atom, formula (2) or formula (3)
- Ar 1 and Ar 2 each independently represent an aryl group having 6 to 20 carbon atoms
- Ar 3 represents an arylene group having 6 to 20 carbon atoms
- any one of Ar 1 to Ar 3 Or two of them may be bonded to each other to form a ring together with the nitrogen atom
- R 6 to R 8 independently of one another, may be substituted with W 1 , an alkyl group having 1 to 20 carbon atoms or carbon Represents an aryl group of 6 to 20,
- W 1 represents a halogen atom, a nitro group, an alkoxy group of 1 to 20 carbon atoms or a cyano group.
- at least one of R 1 to R 5 is a group represented by the formula (3).
- a charge transport material comprising any one of aniline derivatives 1 to 4, 6).
- a charge transporting material comprising 5 charge transporting substances, 7).
- a charge transporting varnish comprising 5 charge transporting substances and an organic solvent; 8). 7 charge transporting varnishes further comprising a dopant, 9.
- R 1 ′ to R 5 ′ each independently represent a hydrogen atom or a compound represented by the formula (2) (In the formula, Ar 1 and Ar 2 each independently represent an aryl group having 6 to 20 carbon atoms, Ar 3 represents an arylene group having 6 to 20 carbon atoms, and any one of Ar 1 to Ar 3 Or two of them may be bonded to each other to form a ring together with the nitrogen atom.) In which at least one of R 1 ′ to R 5 ′ is a hydrogen atom.
- R 1 to R 5 are, independently of one another, a hydrogen atom, formula (2) or formula (3) (In the formula, Ar 1 to Ar 3 and R 6 to R 8 have the same meaning as described above.) Wherein at least one of R 1 to R 5 is a group represented by the formula (3). ]
- the manufacturing method of the aniline derivative represented by these is provided.
- the aniline derivative of the present invention is easily soluble in an organic solvent, and the charge transporting varnish can be easily prepared by dissolving it in an organic solvent together with a dopant. Since the thin film produced from the charge transport varnish of the present invention exhibits high charge transport properties, it can be suitably used as a thin film for electronic devices including organic EL elements. In particular, by applying this thin film to a hole injection layer of an organic EL element, an organic EL element having excellent luminance characteristics can be obtained.
- the charge transporting varnish of the present invention can produce a thin film excellent in charge transporting properties with good reproducibility even when using various wet processes capable of forming a large area such as a spin coating method and a slit coating method, It can sufficiently cope with recent progress in the field of organic EL elements.
- the aniline derivative according to the present invention is represented by the formula (1).
- R 1 to R 5 are each independently a hydrogen atom, a group represented by the formula (2) or the formula (3), and at least one of R 1 to R 5 is a formula It is group represented by (3).
- Ar 1 and Ar 2 each independently represent an aryl group having 6 to 20 carbon atoms
- Ar 3 represents an arylene group having 6 to 20 carbon atoms
- Ar 1 to Ar 3 Any two of these may be bonded to each other to form a ring together with the nitrogen atom.
- aryl group having 6 to 20 carbon atoms include phenyl group, 1-naphthyl group, 2-naphthyl group, 1-anthryl group, 2-anthryl group, 9-anthryl group, 1-phenanthryl group, 2-phenanthryl group. Group, 3-phenanthryl group, 4-phenanthryl group, 9-phenanthryl group and the like.
- arylene group having 6 to 20 carbon atoms include benzene-1,2-diyl (o-phenylene) group, benzene-1,3-diyl (m-phenylene) group, benzene-1,4-diyl ( p-phenylene) group, naphthalene-1,2-diyl group, naphthalene-1,3-diyl group, naphthalene-1,4-diyl group, naphthalene-1,5-diyl group, naphthalene-1,6-diyl group , Naphthalene-1,7-diyl group, naphthalene-1,8-diyl group and the like.
- Examples of the ring formed by combining any two of Ar 1 to Ar 3 together with the nitrogen atom include a carbazole ring.
- Ar 1 and Ar 2 are preferably a phenyl group, a 1-naphthyl group, and a 2-naphthyl group, and more preferably a phenyl group.
- Ar 3 is preferably a benzene-1,2-diyl group, a benzene-1,3-diyl group, or a benzene-1,4-diyl group, and more preferably a benzene-1,4-diyl group.
- the group represented by the formula (2) is preferably a group represented by the formula (2A), and more preferably a group represented by the formula (2A-1).
- R 6 ⁇ R 8 are independently of each other, may be substituted with W 1, represents an alkyl group or an aryl group having 6 to 20 carbon atoms having 1 to 20 carbon atoms, W 1 is Represents an alkoxy group having 1 to 20 carbon atoms, a halogen atom, a nitro group or a cyano group.
- the alkyl group having 1 to 20 carbon atoms may be linear, branched, or cyclic.
- the aryl group having 6 to 20 carbon atoms is the same as described above.
- the alkyl group therein may be linear, branched, or cyclic.
- Examples thereof include a chain or branched alkoxy group, a cyclic alkyloxy group having 3 to 20 carbon atoms such as cyclopentyloxy and cyclohexyloxy groups.
- halogen atom examples include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- R 6 to R 8 are preferably an alkyl group having 1 to 10 carbon atoms and an aryl group having 6 to 10 carbon atoms, and more preferably an alkyl group having 1 to 5 carbon atoms. More specifically, two of R 6 to R 8 are methyl groups, the remaining one is a combination of t-butyl groups, two of R 6 to R 8 are phenyl groups, and the remaining one is a t-butyl group. The combination wherein R 6 to R 8 are all isopropyl groups is preferred, and two of R 6 to R 8 are methyl groups, and the other one is more preferably a t-butyl group.
- the group represented by the formula (3) is preferably a group represented by the following formula (3A), and more preferably a group represented by the following formula (3A-1).
- the aniline derivative represented by the formula (1) preferably has symmetry from the viewpoint of ease of synthesis.
- Specific examples thereof include a compound represented by the following formula (1A) in which all of R 1 to R 5 are groups represented by the above formula (3A-1), R 1 , R 3 and R 5 are hydrogen atoms.
- the aniline derivative represented by the formula (1) of the present invention is prepared by coupling an amine compound represented by the following formula (1 ′) with a carbazole compound represented by the following formula (3 ′) in the presence of a catalyst and a base. It can be produced by ring reaction.
- the compound represented by the formula (3 ′) can be obtained by a known method in which the corresponding carbazole is reacted with a triorgano halide such as trialkylsilyl chloride in the presence of a base such as NaH.
- R 1 ′ to R 5 ′ are each independently a hydrogen atom or a group represented by the formula (2), and at least one of R 1 ′ to R 5 ′ is a hydrogen atom It is.
- R 6 to R 8 are the same as those described in the formula (3), and X represents a halogen atom or a pseudohalogen atom.
- Ar 1 to Ar 3 are the same as described above.
- halogen atom examples include (fluoro) alkylsulfonyloxy groups such as methanesulfonyloxy group, trifluoromethanesulfonyloxy group, and nonafluorobutanesulfonyloxy group; aromatic sulfonyloxy groups such as benzenesulfonyloxy group and toluenesulfonyloxy group Is mentioned.
- X is preferably a halogen atom, more preferably a bromine atom or an iodine atom, considering availability of raw materials, reactivity, and the like. Further, the substitution position of X is not particularly limited, but the para position is preferred with respect to the nitrogen atom of carbazole.
- the amine compound represented by the formula (1 ′) and the formula (3 ′) The charging ratio with the carbazole compound is preferably about 1 to 5 and more preferably about 1.1 to 2 with respect to the NH group 1 of the amine compound in terms of substance amount (mol).
- Examples of the catalyst used in the reaction include copper catalysts such as copper chloride, copper bromide, and copper iodide; Pd (PPh 3 ) 4 (tetrakis (triphenylphosphine) palladium), Pd (PPh 3 ) 2 Cl 2 (bis (triphenylphosphine) dichloropalladium), Pd (dba) 2 (bis (dibenzylideneacetone) palladium), Pd 2 (dba) 3 (tris (dibenzylideneacetone) dipalladium), Pd (Pt Examples thereof include palladium catalysts such as —Bu 3 ) 2 (bis (tri (t-butylphosphine)) palladium) and Pd (OAc) 2 (palladium acetate). These catalysts may be used alone or in combination of two or more.
- catalysts may be used together with a known appropriate ligand.
- ligands include triphenylphosphine, tri-o-tolylphosphine, diphenylmethylphosphine, phenyldimethylphosphine, trimethylphosphine, triethylphosphine, tributylphosphine, tri-t-butylphosphine.
- di-t-butyl (phenyl) phosphine di-t-butyl (4-dimethylaminophenyl) phosphine
- 1,2-bis (diphenylphosphino) ethane 1,3-bis (diphenylphosphino) propane
- Tertiary phosphines such as 1,4-bis (diphenylphosphino) butane and 1,1′-bis (diphenylphosphino) ferrocene
- tertiary phosphites such as trimethyl phosphite, triethyl phosphite and triphenyl phosphite Be mentioned
- di-t-butyl (phenyl) phosphine is preferably used.
- the amount of the catalyst used can be about 0.001 to 1 mol with respect to 1 mol of the target NH group to be reacted with the amine compound represented by the formula (1 ′). About 0.1 mol is preferable, about 0.02 to 0.05 mol is more preferable, and about 0.02 mol is even more preferable. When a ligand is used, the amount used can be 0.1 to 5 equivalents relative to the metal complex to be used, but 1 to 2 equivalents is preferred.
- Examples of the base include lithium, sodium, potassium, lithium hydride, sodium hydride, potassium hydroxide, t-butoxy lithium, t-butoxy sodium, t-butoxy potassium, lithium hydroxide, sodium hydroxide, potassium hydroxide.
- Alkali metal simple substance such as sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, alkali metal hydroxide, alkoxy alkali metal, alkali metal carbonate, alkali metal hydrogen carbonate; alkaline earth metal carbonate such as calcium carbonate, etc.
- sodium t-butoxy is preferred.
- the amount of the base used is preferably about 1 to 2 equivalents, more preferably about 1.2 to 1.5 equivalents with respect to the target NH group to be reacted with the amine compound represented by the formula (1 ′). preferable.
- the reaction is carried out in a solvent in the case where all the raw material compounds are solid or from the viewpoint of efficiently obtaining the target coupling product.
- a solvent the type is not particularly limited as long as it does not adversely affect the reaction.
- Specific examples include aliphatic hydrocarbons (pentane, n-hexane, n-octane, n-decane, decalin, etc.), halogenated aliphatic hydrocarbons (chloroform, dichloromethane, dichloroethane, carbon tetrachloride, etc.), aromatic Group hydrocarbons (benzene, nitrobenzene, toluene, o-xylene, m-xylene, p-xylene, mesitylene, etc.), halogenated aromatic hydrocarbons (chlorobenzene, bromobenzene, o-dichlorobenzene, m-dichlorobenzene, p-dichlorobenzene
- the reaction temperature may be appropriately set within the range from the melting point to the boiling point of the solvent used, but is preferably about 0 to 200 ° C., more preferably about 20 to 150 ° C., and further increases the yield of the coupling product. Considering this, the temperature is more preferably about 40 to 100 ° C.
- post-treatment can be performed according to a conventional method to obtain the desired aniline derivative (coupling product).
- the charge transporting varnish of the present invention includes a charge transporting substance composed of the aniline derivative represented by the formula (1) and an organic solvent. Depending on the use of the obtained thin film, the charge transporting ability is improved. It may contain a dopant substance for the purpose.
- the dopant substance is not particularly limited as long as it dissolves in at least one solvent used for the varnish, and any of inorganic dopant substances and organic dopant substances can be used.
- a heteropolyacid is preferable, and specific examples thereof include phosphomolybdic acid, silicomolybdic acid, phosphotungstic acid, phosphotungstomolybdic acid, and silicotungstic acid.
- the heteropolyacid has a structure in which a hetero atom is located at the center of a molecule, which is typically represented by a Keggin type represented by the formula (D1) or a Dawson type chemical structure represented by the formula (D2), and vanadium ( V), molybdenum (Mo), tungsten (W), and other polyacids such as isopolyacids that are oxygen acids and oxygenates of different elements are condensed.
- the oxygen acid of such a different element mainly include silicon (Si), phosphorus (P), and arsenic (As) oxygen acids.
- heteropolyacids include phosphomolybdic acid, silicomolybdic acid, phosphotungstic acid, silicotungstic acid, and lintongue molybdic acid. These may be used alone or in combination of two or more. Good.
- the heteropolyacid used by this invention is available as a commercial item, and can also be synthesize
- the one kind of heteropolyacid is preferably phosphotungstic acid or phosphomolybdic acid, and phosphotungstic acid is most suitable.
- one of the two or more types of heteropolyacids is preferably phosphotungstic acid or phosphomolybdic acid, and more preferably phosphotungstic acid.
- Heteropolyacids are those obtained as commercially available products or known syntheses even if the number of elements in the quantitative analysis such as elemental analysis is large or small from the structure represented by the general formula As long as it is appropriately synthesized according to the method, it can be used in the present invention.
- phosphotungstic acid is represented by the chemical formula H 3 (PW 12 O 40 ) ⁇ nH 2 O
- phosphomolybdic acid is represented by the chemical formula H 3 (PMo 12 O 40 ) ⁇ nH 2 O, respectively.
- P (phosphorus), O (oxygen), W (tungsten) or Mo (molybdenum) in this formula is large or small, it is obtained as a commercial product.
- W (tungsten) or Mo (molybdenum) in this formula is large or small, it is obtained as a commercial product.
- it can be used in the present invention.
- the mass of the heteropolyacid defined in the present invention is not the mass of pure phosphotungstic acid (phosphotungstic acid content) in the synthesized product or commercially available product, but a commercially available form and a known synthesis. In a form that can be isolated by the method, it means the total mass in a state containing hydration water and other impurities.
- the heteropolyacid contained in the charge transporting varnish of the present invention can be about 0.01 to 50 with respect to the charge transporting material 1 by mass ratio, preferably about 0.1 to 10 and more preferably. Is about 1.0 to 5.0
- examples of the organic dopant substance include aryl sulfonic acid, aryl sulfonic acid ester, ionic compound composed of a predetermined anion and its counter cation, tetracyanoquinodimethane derivative and benzoquinone derivative.
- arylsulfonic acid a compound represented by the following formula (4) or (5) can be preferably used.
- D 1 represents —O— or S—, preferably —O—.
- D 2 represents a naphthalene ring or an anthracene ring, and a naphthalene ring is preferable.
- D 3 represents a divalent to tetravalent perfluorobiphenyl group, j 1 represents the number of bonds between D 1 and D 3, is an integer satisfying 2 ⁇ j 1 ⁇ 4, D 3 is a divalent It is preferable that j 1 is 2.
- j 2 represents the number of sulfonic acid groups bonded to D 2 and is an integer satisfying 1 ⁇ j 2 ⁇ 4, but 2 is preferable.
- D 4 to D 8 are each independently a hydrogen atom, a halogen atom, a cyano group, an alkyl group having 1 to 20 carbon atoms, a halogenated alkyl group having 1 to 20 carbon atoms, or a carbon number of 2 -20 alkenyl halide groups, at least three of D 4 to D 8 are halogen atoms.
- i represents the number of sulfonic acid groups bonded to the naphthalene ring, and is an integer satisfying 1 ⁇ i ⁇ 4, preferably 2 to 4, and more preferably 2.
- Examples of the halogenated alkyl group having 1 to 20 carbon atoms include trifluoromethyl group, 2,2,2-trifluoroethyl group, perfluoroethyl group, 3,3,3-trifluoropropyl group, 2,2,3. , 3,3-pentafluoropropyl group, perfluoropropyl group, 4,4,4-trifluorobutyl group, 3,3,4,4,4-pentafluorobutyl group, 2,2,3,3,4 1,4,4-heptafluorobutyl group, perfluorobutyl group and the like.
- Examples of the halogenated alkenyl group having 2 to 20 carbon atoms include perfluorovinyl group, 1-perfluoropropenyl group, perfluoroallyl group, perfluorobutenyl group and the like.
- halogen atom and the alkyl group having 1 to 20 carbon atoms include the same ones as described above, but the halogen atom is preferably a fluorine atom.
- D 4 to D 8 are a hydrogen atom, a halogen atom, a cyano group, an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 10 carbon atoms, or a halogenated alkenyl group having 2 to 10 carbon atoms.
- at least three of D 4 to D 8 are preferably fluorine atoms, hydrogen atom, fluorine atom, cyano group, alkyl group having 1 to 5 carbon atoms, and alkyl fluoride having 1 to 5 carbon atoms.
- a alkenyl fluoride group having 2 to 5 carbon atoms, and at least three of D 4 to D 8 are more preferably fluorine atoms, such as a hydrogen atom, a fluorine atom, a cyano group, and 1 to 5 carbon atoms. It is even more preferable that the perfluoroalkyl group or a perfluoroalkenyl group having 1 to 5 carbon atoms and that D 4 , D 5 and D 8 are fluorine atoms.
- the perfluoroalkyl group is a group in which all hydrogen atoms of the alkyl group are substituted with fluorine atoms
- the perfluoroalkenyl group is a group in which all hydrogen atoms of the alkenyl group are substituted with fluorine atoms.
- Suitable aryl sulfonic acids include, but are not limited to, those shown below.
- the content thereof with respect to the charge transporting material 1 is preferably about 0.01 to 20.0, more preferably about 0.02 in molar ratio. It is about 4 to 5.0.
- aryl sulfonic acid ester compound a compound represented by the following formula (6) or (6 ′) can be preferably used.
- a 1 is an optionally substituted m-valent hydrocarbon group having 6 to 20 carbon atoms including one or more aromatic rings or the following formula (7 Or an m-valent group derived from the compound represented by (8).
- W 2 and W 3 independently of one another may have —O—, —S—, —S (O) — or —S (O 2 ) —, or a substituent). N-, -Si-, -P- or -P (O)-.
- the m-valent hydrocarbon group having 6 to 20 carbon atoms containing one or more aromatic rings can be obtained by removing m hydrogen atoms from a hydrocarbon having 6 to 20 carbon atoms containing one or more aromatic rings. It is a group.
- the hydrocarbon containing one or more aromatic rings include benzene, toluene, xylene, biphenyl, naphthalene, anthracene, and pyrene. Of these, the hydrocarbon group is preferably a group derived from benzene, biphenyl or the like.
- part or all of the hydrogen atoms may be further substituted with a substituent.
- substituents include fluorine atom, chlorine atom, bromine atom, iodine atom, nitro group, cyano group, hydroxy group, amino group, silanol group, thiol group, carboxy group, sulfonate group, phosphoric acid group, phosphoric acid It may be substituted with an ester group, ester group, thioester group, amide group, monovalent hydrocarbon group, organooxy group, organoamino group, organosilyl group, organothio group, acyl group, sulfo group or the like.
- examples of the monovalent hydrocarbon group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, and a cyclopentyl group.
- An alkyl group having 1 to 10 carbon atoms such as a group, n-hexyl group, cyclohexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group; vinyl group, 1-propenyl group, 2- An alkenyl group having 2 to 10 carbon atoms such as propenyl group, isopropenyl group, 1-methyl-2-propenyl group, 1-butenyl group, 2-butenyl group, 3-butenyl group, hexenyl group; phenyl group, xylyl group, Aryl groups having 6 to 20 carbon atoms such as a tolyl group, 1-naphthyl group and 2-naphthyl group; and aralkyl groups having 7 to 20 carbon atoms such as a benzyl group and a phenylethyl group. That.
- organooxy group examples include an alkoxy group, an alkenyloxy group, and an aryloxy group.
- alkyl group, alkenyl group and aryl group contained in these include the same groups as described above.
- organoamino group examples include methylamino group, ethylamino group, propylamino group, butylamino group, pentylamino group, hexylamino group, cyclohexylamino group, heptylamino group, octylamino group, nonylamino group, decylamino group, dodecyl group.
- alkylamino group having 1 to 12 carbon atoms such as amino group; dimethylamino group, diethylamino group, dipropylamino group, dibutylamino group, dipentylamino group, dihexylamino group, dicyclohexylamino group, diheptylamino group, dioctylamino group; A dialkylamino group in which each alkyl group such as dinonylamino group and didecylamino group is an alkyl group having 1 to 12 carbon atoms; a morpholino group and the like.
- organosilyl group examples include trimethylsilyl group, triethylsilyl group, tripropylsilyl group, tributylsilyl group, tripentylsilyl group, trihexylsilyl group, pentyldimethylsilyl group, hexyldimethylsilyl group, octyldimethylsilyl group, decyldimethyl group.
- organosilyl group examples include trimethylsilyl group, triethylsilyl group, tripropylsilyl group, tributylsilyl group, tripentylsilyl group, trihexylsilyl group, pentyldimethylsilyl group, hexyldimethylsilyl group, octyldimethylsilyl group, decyldimethyl group.
- trialkylsilyl groups in which each alkyl group such as a silyl group is an alkyl group
- organothio group examples include alkylthio groups having 1 to 12 carbon atoms such as methylthio group, ethylthio group, propylthio group, butylthio group, pentylthio group, hexylthio group, heptylthio group, octylthio group, nonylthio group, decylthio group and dodecylthio group. It is done.
- acyl group examples include C1-C10 acyl groups such as formyl group, acetyl group, propionyl group, butyryl group, isobutyryl group, valeryl group, isovaleryl group, and benzoyl group.
- the monovalent hydrocarbon group, organooxy group, organoamino group, organoamino group, organosilyl group, organothio group, and acyl group preferably have 1 to 8 carbon atoms.
- a fluorine atom, a sulfonic acid group, an alkyl group, an organooxy group, and an organosilyl group are more preferable.
- a 2 is —O—, —S— or NH—. Of these, —O— is preferable because of easy synthesis.
- a 3 is an (n + 1) -valent aromatic group having 6 to 20 carbon atoms.
- the aromatic group is a group obtained by removing (n + 1) hydrogen atoms on an aromatic ring from an aromatic compound having 6 to 20 carbon atoms.
- the aromatic compound means an aromatic hydrocarbon and an aromatic heterocyclic compound. Examples of the aromatic compound include benzene, toluene, xylene, biphenyl, naphthalene, anthracene, and pyrene.
- the aromatic group represented by A 3 is a group derived from naphthalene or anthracene. Is preferred.
- X 1 is an alkylene group having 2 to 5 carbon atoms, and the alkylene group has —O—, —S— or a carbonyl group between the carbon atoms. A part or all of the hydrogen atoms may be further substituted with an alkyl group having 1 to 20 carbon atoms.
- X 1 is preferably an ethylene group, a trimethylene group, a methyleneoxymethylene group, a methylenethiomethylene group or the like, and some or all of the hydrogen atoms of these groups are further substituted with an alkyl group having 1 to 20 carbon atoms. May be.
- alkyl group examples include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, cyclopentyl group, and n-hexyl group. Cyclohexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, bicyclohexyl group and the like.
- X 2 is a single bond, —O—, —S— or NR a —.
- R a is a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms.
- the monovalent hydrocarbon group is preferably an alkyl group such as a methyl group, an ethyl group, or an n-propyl group.
- X 2 is preferably a single bond, —O— or S—, and more preferably a single bond or O—.
- X 3 is an optionally substituted monovalent hydrocarbon group having 1 to 20 carbon atoms.
- the monovalent hydrocarbon group include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, cyclopentyl group, n Alkyl groups having 1 to 20 carbon atoms such as -hexyl group, cyclohexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, bicyclohexyl group A vinyl group, 1-propenyl group, 2-propenyl group, isopropenyl group, 1-methyl-2-propenyl group, 1-buten
- alkenyl groups phenyl group, xylyl group, tolyl group, 1-naphthyl group, 2-naphthyl group, 1-anthryl group, 2-anthryl group, 9-anthryl group, An aryl group having 6 to 20 carbon atoms such as phenanthryl group, 2-phenanthryl group, 3-phenanthryl group, 4-phenanthryl group, 9-phenanthryl group, 2-biphenylyl group, 3-biphenylyl group, 4-biphenylyl group; And aralkyl groups having 7 to 20 carbon atoms such as a phenyl group, a phenylethyl group, and a phenylcyclohexyl group.
- X 3 is preferably an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms.
- n is an integer satisfying 1 ⁇ n ⁇ 4, but 2 is preferable.
- the aryl sulfonic acid ester compound represented by the formula (6) or (6 ′) has high solubility in a wide range of solvents including a low polarity solvent, the physical properties of the solution are prepared using a wide variety of solvents.
- the coating properties are high. Therefore, it is preferable to apply in the state of sulfonic acid ester and generate sulfonic acid during drying or baking of the coating film.
- the temperature at which the sulfonic acid is generated from the sulfonic acid ester is preferably 40 to 260 ° C. because it is stable at room temperature and preferably equal to or lower than the firing temperature. Furthermore, considering the high stability in the varnish and the ease of desorption during firing, the temperature is preferably 80 to 230 ° C, more preferably 120 to 180 ° C.
- arylsulfonic acid ester compound represented by the formula (6) those represented by any of the following formulas (6-1) to (6-3) are preferable. (In the formula, m and n are the same as described above.)
- a 11 is an m-valent group derived from perfluorobiphenyl.
- a 12 is —O— or S—, preferably —O—.
- a 13 is an (n + 1) -valent group derived from naphthalene or anthracene, but is preferably a group derived from naphthalene.
- R s1 to R s4 are each independently a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms, and R s5 is a substituted group. It is also a monovalent hydrocarbon group having 2 to 20 carbon atoms.
- the linear or branched alkyl group is not particularly limited, but includes a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, an n-hexyl group, and the like. Is mentioned. Of these, alkyl groups having 1 to 3 carbon atoms are preferred.
- Examples of the monovalent hydrocarbon group having 2 to 20 carbon atoms include alkyl groups such as ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, and tert-butyl group, phenyl group, naphthyl group, and phenanthryl. And aryl groups such as groups.
- R s1 to R s4 is preferably a linear alkyl group having 1 to 3 carbon atoms, and the remainder is a hydrogen atom. Further, it is preferable that R s1 is a linear alkyl group having 1 to 3 carbon atoms, and R s2 to R s4 are hydrogen atoms.
- the linear alkyl group having 1 to 3 carbon atoms is preferably a methyl group.
- R s5 is preferably a linear alkyl group having 2 to 4 carbon atoms or a phenyl group.
- a 14 is an optionally substituted m-valent hydrocarbon group having 6 to 20 carbon atoms and containing one or more aromatic rings.
- the hydrocarbon group is a group obtained by removing m hydrogen atoms from an m-valent hydrocarbon having 6 to 20 carbon atoms and containing one or more aromatic rings.
- examples of the hydrocarbon include benzene, toluene, xylene, ethylbenzene, biphenyl, naphthalene, anthracene, phenanthrene and the like.
- part or all of the hydrogen atoms may be further substituted with a substituent, and examples of the substituent include the same as those described in the description of A 1.
- a 14 is preferably the same as that described as the preferred example of A 1 .
- a 15 is —O— or S—, preferably —O—.
- a 16 is an (n + 1) -valent aromatic group having 6 to 20 carbon atoms.
- the aromatic group is a group obtained by removing (n + 1) hydrogen atoms from the aromatic ring of an aromatic compound having 6 to 20 carbon atoms.
- the aromatic compound include benzene, toluene, xylene, biphenyl, naphthalene, anthracene, and pyrene.
- a 16 is preferably a group derived from naphthalene or anthracene, and more preferably a group derived from naphthalene.
- R s6 and R s7 are each independently a hydrogen atom or a linear or branched monovalent aliphatic hydrocarbon group.
- R s8 is a linear or branched monovalent aliphatic hydrocarbon group.
- the total number of carbon atoms of R s6 , R s7 and R s8 is 6 or more.
- the upper limit of the total number of carbon atoms of R s6 , R s7 and R s8 is not particularly limited, but is preferably 20 or less, and more preferably 10 or less.
- the linear or branched monovalent aliphatic hydrocarbon group is not particularly limited, but is a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, Alkyl groups having 1 to 20 carbon atoms such as n-hexyl group, n-octyl group, 2-ethylhexyl group, decyl group; vinyl group, 1-propenyl group, 2-propenyl group, isopropenyl group, 1-methyl-2 -An alkenyl group having 2 to 20 carbon atoms such as a propenyl group, a 1-butenyl group, a 2-butenyl group, a 3-butenyl group, and a hexenyl group.
- R s6 is preferably a hydrogen atom
- R s7 and R s8 are preferably alkyl groups having 1 to 6 carbon atoms. In this case, R s7 and R s8 may be the same or different.
- n is an integer satisfying 1 ⁇ n ⁇ 4, but 2 is preferable.
- R s9 to R s13 each independently represent a hydrogen atom, a nitro group, a cyano group, a halogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkyl halide having 1 to 10 carbon atoms. Or a halogenated alkenyl group having 2 to 10 carbon atoms.
- the alkyl group having 1 to 10 carbon atoms may be linear, branched or cyclic, and specific examples thereof include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl.
- the halogenated alkyl group having 1 to 10 carbon atoms is not particularly limited as long as a part or all of the hydrogen atoms of the alkyl group having 1 to 10 carbon atoms are substituted with halogen atoms.
- the halogenated alkyl group may be linear, branched or cyclic, and specific examples thereof include trifluoromethyl group, 2,2,2-trifluoroethyl group, 1,1,2,2, 2-pentafluoroethyl group, 3,3,3-trifluoropropyl group, 2,2,3,3,3-pentafluoropropyl group, 1,1,2,2,3,3,3-heptafluoropropyl group Group, 4,4,4-trifluorobutyl group, 3,3,4,4,4-pentafluorobutyl group, 2,2,3,3,4,4,4-heptafluorobutyl group, 1,1 2,2,3,3,4,4,4-nonafluorobutyl group and the like.
- the halogenated alkenyl group having 2 to 10 carbon atoms is not particularly limited as long as part or all of the hydrogen atoms of the alkenyl group having 2 to 10 carbon atoms are substituted with halogen atoms. Specific examples thereof include perfluorovinyl group, perfluoro-1-propenyl group, perfluoro-2-propenyl group, perfluoro-1-butenyl group, perfluoro-2-butenyl group, perfluoro-3-butenyl group. Etc.
- R s9 is preferably a nitro group, a cyano group, a halogenated alkyl group having 1 to 10 carbon atoms, a halogenated alkenyl group having 2 to 10 carbon atoms, or the like.
- 4 halogenated alkyl groups, C2-C4 halogenated alkenyl groups, and the like are more preferable, and nitro groups, cyano groups, trifluoromethyl groups, perfluoropropenyl groups, and the like are more preferable.
- R s10 to R s13 are preferably halogen atoms, and more preferably fluorine atoms.
- a 17 is —O—, —S— or NH—, preferably —O—.
- a 18 is an (n + 1) -valent aromatic group having 6 to 20 carbon atoms.
- the aromatic group is a group obtained by removing (n + 1) hydrogen atoms from the aromatic ring of an aromatic compound having 6 to 20 carbon atoms.
- the aromatic compound include benzene, toluene, xylene, biphenyl, naphthalene, anthracene, and pyrene.
- a 18 is preferably a group derived from naphthalene or anthracene, and more preferably a group derived from naphthalene.
- R s14 to R s17 are each independently a hydrogen atom or a linear or branched monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms.
- Examples of the monovalent aliphatic hydrocarbon group include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, and cyclopentyl group.
- Alkyl groups having 1 to 20 carbon atoms such as n-hexyl group, cyclohexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, etc .; vinyl Group, 1-propenyl group, 2-propenyl group, isopropenyl group, 1-methyl-2-propenyl group, 1-butenyl group, 2-butenyl group, 3-butenyl group, hexenyl group, etc.
- An alkenyl group etc. are mentioned. Of these, an alkyl group having 1 to 20 carbon atoms is preferable, an alkyl group having 1 to 10 carbon atoms is more preferable, and an alkyl group having 1 to 8 carbon atoms is more preferable.
- R s18 is a linear or branched monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms, or OR s19 .
- R s19 is an optionally substituted monovalent hydrocarbon group having 2 to 20 carbon atoms.
- R s18 examples include the same ones as described above.
- R s18 is a monovalent aliphatic hydrocarbon group
- R s18 is preferably an alkyl group having 1 to 20 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms, and an alkyl group having 1 to 8 carbon atoms. Is even more preferable.
- Examples of the monovalent hydrocarbon group having 2 to 20 carbon atoms represented by R s19 include aryl groups such as a phenyl group, a naphthyl group, and a phenanthryl group, in addition to the aforementioned monovalent aliphatic hydrocarbon groups other than a methyl group. Etc. Of these, R s19 is preferably a linear alkyl group having 2 to 4 carbon atoms or a phenyl group. Examples of the substituent that the monovalent hydrocarbon group may have include a fluoro group, an alkoxy group having 1 to 4 carbon atoms, a nitro group, and a cyano group.
- n is an integer satisfying 1 ⁇ n ⁇ 4, but 2 is preferable.
- arylsulfonic acid ester compound represented by the formula (6-3) those represented by the following formula (6-3-1) or (6-3-2) are particularly preferable.
- R s9 to R s17 , R s19 and n are the same as described above.
- R s20 is a linear or branched monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms, and specific examples thereof are the same as those described in the description of R s18 .
- R s14 or R s16 out of R s14 to R s17 is a linear alkyl group having 1 to 3 carbon atoms, and the rest is hydrogen An atom is preferred.
- R s14 is preferably a linear alkyl group having 1 to 3 carbon atoms
- R s15 to R s17 are preferably hydrogen atoms.
- the linear alkyl group having 1 to 3 carbon atoms is preferably a methyl group.
- R s19 is preferably a linear alkyl group having 2 to 4 carbon atoms or a phenyl group.
- the total number of carbon atoms of R s14 , R s16 and R s20 is preferably 6 or more.
- the upper limit of the total carbon number of R s14 , R s16 and R s20 is preferably 20 or less, and more preferably 10 or less.
- R s14 is preferably a hydrogen atom
- R s16 and R s20 are preferably alkyl groups having 1 to 6 carbon atoms.
- R s16 and R s20 may be the same as or different from each other.
- aryl sulfonic acid ester compounds represented by the formulas (6) and (6 ′) may be used singly or in combination of two or more.
- Suitable aryl sulfonates include, but are not limited to, those shown below.
- the content thereof is preferably about 0.01 to 20, more preferably about 0.05 to 15 with respect to the charge transport material 1 in terms of molar ratio. is there.
- the ionic compounds mention may be made of the anion represented by the following formula (9a) or Z a, a metal salt or an onium salt consisting of its counter cation.
- Ar a1 to Ar a4 are each independently an aromatic hydrocarbon group which may have a substituent or Represents an aromatic heterocyclic group which may have a substituent.
- E is preferably boron, gallium, phosphorus, or antimony among elements belonging to Group 13 or 15 of the long-period periodic table, and more preferably boron.
- examples of the aromatic hydrocarbon group and the aromatic heterocyclic group include monovalent groups derived from a 5- or 6-membered monocyclic ring or a 2-4 condensed ring.
- a monovalent group derived from a benzene ring, a naphthalene ring, a pyridine ring, a pyrazine ring, a pyridazine ring, a pyrimidine ring, a triazine ring, a quinoline ring, or an isoquinoline ring is preferable from the viewpoint of stability and heat resistance of the compound.
- At least one group out of Ar a1 to Ar a4 has one or more fluorine atoms or chlorine atoms as substituents.
- it is most preferably a perfluoroaryl group in which all hydrogen atoms of Ar a1 to Ar a4 are substituted with fluorine atoms.
- the perfluoroaryl group include a pentafluorophenyl group, a heptafluoro-2-naphthyl group, and a tetrafluoro-4-pyridyl group.
- the Z a ions represented by the following formula (9b), hydroxide ion, fluoride ion, chloride ion, bromide ion, iodide ion, cyanide ion, nitrate ion, nitrite ion, sulfate ion, Sulfite ion, perchlorate ion, perbromate ion, periodate ion, chlorate ion, chlorite ion, hypochlorite ion, phosphate ion, phosphite ion, hypophosphite ion, boric acid Ion, isocyanate ion, hydrosulfide ion, tetrafluoroborate ion, hexafluorophosphate ion, hexachloroantimonate ion; carboxylate ion such as acetate ion, trifluoroacetate ion, benzoate ion; me
- E 2 represents an element belonging to Group 15 of the long-period periodic table
- X a represents a halogen atom such as a fluorine atom, a chlorine atom, or a bromine atom.
- E 2 is preferably a phosphorus atom, an arsenic atom, or an antimony atom, and a phosphorus atom is preferable from the viewpoints of stability of the compound, ease of synthesis and purification, and toxicity.
- X a is preferably a fluorine atom or a chlorine atom, and most preferably a fluorine atom, from the viewpoint of stability of the compound, ease of synthesis and purification.
- metal ions and onium ions can be suitably used as counter cations.
- the metal ion is preferably a monovalent metal ion, and includes Li + , Na + , K +, Ag + and the like, and Ag + is particularly preferable.
- the onium ions include iodonium ions, sulfonium ions, ammonium ions, and phosphonium ions, and iodonium ions represented by the following formula (10) are particularly preferable.
- R 101 and R 102 are each independently an alkyl group having 1 to 12 carbon atoms, an alkenyl group having 2 to 12 carbon atoms, an alkynyl group having 2 to 12 carbon atoms, or 6 to 20 carbon atoms.
- An aryl group of 2 to 20 carbon atoms, a halogen atom, a cyano group, a nitro group, an alkyl group of 1 to 12 carbon atoms, an alkenyl group of 2 to 12 carbon atoms, an alkynyl group of 2 to 12 carbon atoms Group, an aryl group having 6 to 20 carbon atoms or a heteroaryl group having 2 to 20 carbon atoms may be substituted.
- an ion represented by the following formula (10 ′) can also be used.
- a 4 represents an element belonging to Group 16 of the long-period periodic table, which is an element after the third period (third to sixth periods) of the periodic table.
- elements before the fifth period (third to fifth periods) of the periodic table are preferable. That is, as A 4 , any of a sulfur atom, a selenium atom and a tellurium atom is preferable, and a sulfur atom is more preferable.
- R 103 represents an organic group bonded to A 4 through a carbon atom, and R 104 and R 105 independently represent an arbitrary substituent. Two or more adjacent groups of R 103 to R 105 may be bonded to each other to form a ring.
- R 103 is not particularly limited as long as it is an organic group having a carbon atom at the bond to A 4 , unless it is contrary to the spirit of the present invention.
- the molecular weight of R 103 is usually 1,000 or less, preferably 500 or less, including the substituents.
- Preferred examples of R 103 include alkyl groups, alkenyl groups, alkynyl groups, aromatic hydrocarbon groups, and aromatic heterocyclic groups from the viewpoint of delocalizing positive charges. Among them, an aromatic hydrocarbon or an aromatic heterocyclic group is preferable because it delocalizes positive charges and is thermally stable.
- aromatic hydrocarbon group examples include a monovalent group derived from a 5- or 6-membered monocyclic ring or a 2-5 condensed ring, and a positive charge can be delocalized on the group.
- Specific examples thereof include monovalent groups derived from a benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, perylene ring, tetracene ring, pyrene ring, benzpyrene ring, chrysene ring, triphenylene ring, acenaphthene ring, fluorene ring, and the like. Can be mentioned.
- aromatic heterocyclic group examples include a monovalent group derived from a 5- or 6-membered monocyclic ring or a 2-4 condensed ring, and a group capable of delocalizing a positive charge on the group.
- Specific examples thereof include furan ring, benzofuran ring, thiophene ring, benzothiophene ring, pyrrole ring, pyrazole ring, triazole ring, imidazole ring, oxadiazole ring, indole ring, carbazole ring, pyrroloimidazole ring, pyrrolopyrazole ring, Pyrrolopyrrole ring, thienopyrrole ring, thienothiophene ring, furopyrrole ring, furofuran ring, thienofuran ring, benzisoxazole ring, benzisothiazole ring, benzimidazole ring, pyridine ring, pyra
- the alkyl group may be linear, branched or cyclic, and includes those having usually 1 or more carbon atoms and usually 12 or less, preferably 6 or less. Specific examples include a methyl group, an ethyl group, an n-propyl group, a 2-propyl group, an n-butyl group, an isobutyl group, a tert-butyl group, and a cyclohexyl group.
- alkenyl group examples include those having usually 2 or more, usually 12 or less, preferably 6 or less carbon atoms. Specific examples include a vinyl group, an allyl group, and a 1-butenyl group.
- alkynyl group examples include those having usually 2 or more, usually 12 or less, preferably 6 or less. Specific examples include an ethynyl group and a propargyl group.
- R 104 and R 105 are not particularly limited as long as they do not contradict the spirit of the present invention.
- the molecular weights of R 104 and R 105 are each a value including the substituent, and are usually 1,000 or less, preferably 500 or less.
- R 104 and R 105 include alkyl group, alkenyl group, alkynyl group, aromatic hydrocarbon group, aromatic heterocyclic group, amino group, alkoxy group, aryloxy group, acyl group, alkoxycarbonyl group, aryloxy Examples include carbonyl group, alkylcarbonyloxy group, alkylthio group, arylthio group, sulfonyl group, alkylsulfonyl group, arylsulfonyl group, cyano group, hydroxyl group, thiol group, silyl group and the like.
- an organic group having a carbon atom at the bond portion with A 4 is preferable because of its high electron accepting property, such as an alkyl group, an alkenyl group, an alkynyl group, an aromatic hydrocarbon group, and an aromatic group.
- Heterocyclic groups are preferred.
- an aromatic hydrocarbon group or an aromatic heterocyclic group is preferable because it has a large electron accepting property and is thermally stable.
- alkyl group examples include alkenyl group, alkynyl group, aromatic hydrocarbon group, and aromatic heterocyclic group.
- Examples of the amino group include an alkylamino group, an arylamino group, and an acylamino group.
- Examples of the alkylamino group include alkylamino groups having one or more alkyl groups usually having 1 or more carbon atoms and usually 12 or less, preferably 6 or less carbon atoms. Specific examples include a methylamino group, a dimethylamino group, a diethylamino group, and a dibenzylamino group.
- arylamino group examples include arylamino groups having at least one aromatic hydrocarbon group or aromatic heterocyclic group having usually 3 or more, preferably 4 or more, and usually 25 or less, preferably 15 or less. It is done. Specific examples include a phenylamino group, a diphenylamino group, a tolylamino group, a pyridylamino group, and a thienylamino group.
- acylamino group examples include an acylamino group having at least one acyl group having 2 or more carbon atoms and usually 25 or less, preferably 15 or less carbon atoms. Specific examples include an acetylamino group and a benzoylamino group.
- alkoxy group examples include an alkoxy group having usually 1 or more carbon atoms and usually 12 or less, preferably 6 or less. Specific examples include a methoxy group, an ethoxy group, and a butoxy group.
- aryloxy group examples include an aryloxy group having an aromatic hydrocarbon group or an aromatic heterocyclic group having usually 3 or more, preferably 4 or more, and usually 25 or less, preferably 15 or less. Specific examples include a phenyloxy group, a naphthyloxy group, a pyridyloxy group, and a thienyloxy group.
- acyl group examples include acyl groups having usually 1 or more carbon atoms and usually 25 or less, preferably 15 or less. Specific examples include formyl group, acetyl group, and benzoyl group.
- alkoxycarbonyl group examples include alkoxycarbonyl groups having usually 2 or more carbon atoms and usually 10 or less, preferably 7 or less. Specific examples include a methoxycarbonyl group and an ethoxycarbonyl group.
- aryloxycarbonyl group examples include those having an aromatic hydrocarbon group or an aromatic heterocyclic group having usually 3 or more, preferably 4 or more, and usually 25 or less, preferably 15 or less. Specific examples include a phenoxycarbonyl group and a pyridyloxycarbonyl group.
- alkylcarbonyloxy group examples include alkylcarbonyloxy groups having usually 2 or more carbon atoms and usually 10 or less, preferably 7 or less. Specific examples include an acetoxy group and a trifluoroacetoxy group.
- alkylthio group examples include alkylthio groups having usually 1 or more carbon atoms and usually 12 or less, preferably 6 or less. Specific examples include a methylthio group and an ethylthio group.
- arylthio group examples include arylthio groups having usually 3 or more, preferably 4 or more, and usually 25 or less, preferably 14 or less. Specific examples include a phenylthio group, a naphthylthio group, and a pyridylthio group.
- alkylsulfonyl group and arylsulfonyl group include a mesyl group and a tosyl group.
- sulfonyloxy group examples include a mesyloxy group and a tosyloxy group.
- silyl group examples include a trimethylsilyl group and a triphenylsilyl group.
- the groups exemplified as R 103 , R 104 and R 105 may be further substituted with other substituents as long as not departing from the spirit of the present invention.
- the type of the substituent is not particularly limited, and examples thereof include a halogen atom, a cyano group, a thiocyano group, and a nitro group in addition to the groups exemplified as R 103 , R 104 and R 105 .
- an alkyl group an alkenyl group, an alkynyl group, an alkoxy group, an aryloxy group, an aromatic hydrocarbon group, or an aromatic complex.
- a cyclic group is preferred.
- an ionic compound (see Japanese Patent No. 5381931) which is a combination of an anion and a cation represented by the following formulas (11) to (14) can be preferably used.
- an onium borate salt (however, an electrically neutral salt) comprising a monovalent or divalent anion represented by the formula (a1) and a counter cation represented by the formulas (c1) to (c5) It can be used suitably.
- Ar represents an aryl group which may have a substituent or a heteroaryl group which may have a substituent, independently of each other, and L represents an alkylene group, —NH—, oxygen atom, sulfur Represents an atom or —CN + —;
- aryl group examples include aryl groups having 6 to 20 carbon atoms. Specific examples thereof include phenyl group, tolyl group, 1-naphthyl group, 2-naphthyl group, 1-anthryl group, 2-anthryl group, 9-anthryl group, 1-phenanthryl group, 2-phenanthryl group, 3-phenanthryl group. Group, 4-phenanthryl group, 9-phenanthryl group and the like, and phenyl group, tolyl group and naphthyl group are preferable.
- substituents examples include a halogen atom, a nitro group, a cyano group, an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, and an alkynyl group having 2 to 20 carbon atoms.
- halogen atom examples include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, and a fluorine atom is preferable.
- the alkyl group having 1 to 20 carbon atoms may be linear, branched or cyclic, and specific examples thereof include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, Isobutyl, s-butyl, t-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n- Examples include dodecyl group, n-tridecyl group, n-tetradecyl group, n-pentadecyl group, n-hexadecyl group, n-heptadecyl group, n-octadecyl group, n-nonadecyl group, n-eicosanyl group, etc
- alkenyl group having 2 to 20 carbon atoms include ethenyl group, n-1-propenyl group, n-2-propenyl group, 1-methylethenyl group, n-1-butenyl group, n-2-butenyl group, n-3-butenyl group, 2-methyl-1-propenyl group, 2-methyl-2-propenyl group, 1-ethylethenyl group, 1-methyl-1-propenyl group, 1-methyl-2-propenyl group, n- Examples thereof include a 1-pentenyl group, an n-1-decenyl group, and an n-1-eicosenyl group.
- alkynyl group having 2 to 20 carbon atoms examples include ethynyl group, n-1-propynyl group, n-2-propynyl group, n-1-butynyl group, n-2-butynyl group, and n-3-butynyl.
- the aryl group preferably has one or more electron withdrawing groups among the above-described substituents.
- the electron-withdrawing group include a halogen atom, a nitro group, and a cyano group.
- a halogen atom is preferable, and a fluorine atom is particularly preferable.
- the heteroaryl group is preferably a heteroaryl group having 2 to 20 carbon atoms. Specific examples thereof include 2-thienyl group, 3-thienyl group, 2-furanyl group, 3-furanyl group, 2-oxazolyl group, 4-oxazolyl group, 5-oxazolyl group, 3-isoxazolyl group, 4-isoxazolyl group.
- Oxygen-containing heteroaryl groups such as 5-isoxazolyl group, sulfur-containing heteroaryl groups such as 2-thiazolyl group, 4-thiazolyl group, 5-thiazolyl group, 3-isothiazolyl group, 4-isothiazolyl group, 5-isothiazolyl group, 2-imidazolyl group, 4-imidazolyl group, 2-pyridyl group, 3-pyridyl group, 4-pyridyl group, 2-pyrazyl group, 3-pyrazyl group, 5-pyrazyl group, 6-pyrazyl group, 2-pyrimidyl group, 4-pyrimidyl group, 5-pyrimidyl group, 6-pyrimidyl group, 3-pyridazyl group, 4-pyridazyl group, 5-pyridazyl group, -Pyridazyl group, 1,2,3-triazin-4-yl group, 1,2,3-triazin-5-yl group, 1,2,4-triazin-3-yl group, 1,
- Examples of the substituent that the heteroaryl group has include the same substituents as those exemplified for the aryl group.
- L represents an alkylene group, —NH—, an oxygen atom, a sulfur atom or —CN + —, preferably —CN + —.
- the alkylene group may be linear, branched or cyclic, and examples thereof include an alkylene group having 1 to 20 carbon atoms, preferably 1 to 10 carbon atoms. Specific examples thereof include a methylene group, a methylmethylene group, a dimethylmethylene group, an ethylene group, a trimethylene group, a propylene group, a tetramethylene group, a pentamethylene group, and a hexamethylene group.
- Examples of the anion of the formula (a1) that can be suitably used in the present invention include those represented by the formula (a2), but are not limited thereto.
- examples of the counter cation include those represented by the formulas (c1) to (c5).
- the onium borate salts may be used singly or in combination of two or more. Moreover, you may use together other well-known onium borate salts as needed.
- the onium borate salt can be synthesized with reference to a known method described in, for example, JP-A-2005-314682.
- the onium borate salt may be previously dissolved in an organic solvent in order to facilitate dissolution in the charge transporting varnish.
- organic solvents include carbonates such as propylene carbonate, ethylene carbonate, 1,2-butylene carbonate, dimethyl carbonate, and diethyl carbonate; ketones such as acetone, methyl ethyl ketone, cyclohexanone, methyl isoamyl ketone, and 2-heptanone; ethylene Glycol, ethylene glycol monoacetate, diethylene glycol, diethylene glycol monoacetate, propylene glycol, propylene glycol monoacetate, dipropylene glycol, monomethyl ether, monoethyl ether, monopropyl ether, monobutyl ether or monophenyl ether of dipropylene glycol monoacetate, etc.
- cyclic ethers such as dioxane Class: ethyl formate, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate, butyl acetate, methyl pyruvate, methyl acetoacetate, ethyl acetoacetate, ethyl pyruvate, ethyl ethoxyacetate, methyl methoxypropionate, ethyl ethoxypropionate, Methyl 2-hydroxypropionate, ethyl 2-hydroxypropionate, ethyl 2-hydroxy-2-methylpropionate, methyl 2-hydroxy-3-methylbutanoate, 3-methoxybutyl acetate, 3-methyl-3-methoxybutyl acetate Esters such as toluene; xylene, 3-phenoxytoluene, 4-methoxytoluene, methyl benzoate, cyclohexane Class: ethy
- tetracyanoquinodimethane derivative examples include 7,7,8,8-tetracyanoquinodimethane (TCNQ), 2-fluoro-7,7,8,8-tetracyanoquinodimethane, 2,5 -Tetracyanoquinodimethanes such as difluoro-7,7,8,8-tetracyanoquinodimethane, halotetracyanoquinodimethanes such as tetrafluoro-7,7,8,8-tetracyanoquinodimethane ( HaloTCNQ) and the like.
- TCNQ 7,7,8,8-tetracyanoquinodimethane
- 2-fluoro-7,7,8,8-tetracyanoquinodimethane 2,5 -Tetracyanoquinodimethanes
- difluoro-7,7,8,8-tetracyanoquinodimethane halotetracyanoquinodimethanes
- benzoquinone derivatives include tetrafluoro-1,4-benzoquinone, tetrachloro-1,4-benzoquinone (chloranil), 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), and the like. Is mentioned. These inorganic and organic dopant materials may be used alone or in combination of two or more.
- halotetracyanoquinodimethane compound examples include compounds represented by the formula (15).
- R 10 to R 13 each independently represent a hydrogen atom or a halogen atom, but at least one is a halogen atom, preferably at least two are halogen atoms, and at least three are halogen atoms. More preferably, all are most preferably halogen atoms.
- a halogen atom A fluorine atom or a chlorine atom is preferable and a fluorine atom is more preferable.
- halotetracyanoquinodimethane compound examples include tetrafluorotetracyanoquinodimethane (F4TCNQ), tetrachlorotetracyanoquinodimethane, 2-fluorotetracyanoquinodimethane, 2-chlorotetracyanoquinodimethane, 2,5-Difluorotetracyanoquinodimethane, 2,5-dichlorotetracyanoquinodimethane, and the like can be mentioned.
- F4TCNQ is optimal.
- the content of the halotetracyanoquinodimethane compound in the charge transporting varnish of the present invention is preferably 0.0001 to 50 equivalents, more preferably 0.001 to 20 equivalents, still more preferably 0.001 equivalents relative to the aniline derivative. 01 to 10 equivalents.
- the charge transporting varnish of the present invention contains an organosilane compound in consideration of obtaining a long-life device with good reproducibility.
- organosilane compound include dialkoxysilane compounds, trialkoxysilane compounds, and tetraalkoxysilane compounds, which may be used alone or in combination of two or more.
- a dialkoxysilane compound or a trialkoxysilane compound is preferable, and a trialkoxysilane compound is more preferable.
- alkoxysilane compounds include those represented by the formulas (16) to (18).
- Si (OR) 4 (16) SiR ′ (OR) 3 (17) Si (R ′) 2 (OR) 2 (18)
- an alkyl group of Z 1 is 1 carbon atoms which may be ⁇ 20 substituted with an alkenyl group are optionally 2-20 carbon atoms substituted with Z 1
- an optionally substituted alkynyl group having 2 to 20 carbon atoms is also hetero Z 2 carbon atoms which may be substituted with 6-20 aryl or carbon atoms and optionally substituted by Z 2 2-20
- an alkenyl group of Z 3 is 1-2 carbon atoms which may be 20 substituted with, Z 3-substituted-2 carbon atoms which may be 20 alkynyl group, Z 4 with an aryl group which have 6 to carbon atoms which may be 20 substituted or Z 4 2 carbon atoms which may be substituted with ⁇
- Z 1 represents a heteroaryl group halogen atom, Z 5-substituted of not having 6 to carbon atoms which may be 20 aryl group, or Z 5 is optionally 2-20 carbon atoms substituted with,
- Z 2 is , halogen atom, optionally substituted by Z 5 in alkyl group having 1 carbon atoms which may be 20 substituted
- alkenyl group Z 5 is 1-2 carbon atoms which may be 20 substituted by or Z 5
- An alkynyl group having 2 to 20 carbon atoms is represented.
- Z 3 is a heteroaryl group of a halogen atom, Z 5 aryl groups which do carbon atoms 6 to be 20 substituted, Z 5 is 1-2 carbon atoms which may be 20 substituted with an epoxy cyclohexyl group, glycidoxy group Methacryloxy group, acryloxy group, ureido group (—NHCONH 2 ), thiol group, isocyanate group (—NCO), amino group, —NHY 1 group, or —NY 2 Y 3 group, and Z 4 represents a halogen atom, Z 5 in the optionally substituted alkyl group having 1 to 20 carbon atoms, Z 5-substituted-2 carbon atoms which may be 20 alkenyl group, Z 5 1-2 carbon atoms which may be substituted with 20 alkynyl group, an epoxycyclohexyl group, a glycidoxy group, a methacryloxy group, an acryloxy group, a ureido group (-NHCONH
- a halogen atom an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, and Examples of the heteroaryl group having 2 to 20 carbon atoms include those similar to those exemplified in the description of the formula (a1).
- the alkyl group, alkenyl group and alkynyl group preferably have 10 or less carbon atoms, more preferably 6 or less, and still more preferably 4 or less.
- the carbon number of the aryl group and heteroaryl group is preferably 14 or less, more preferably 10 or less, and even more preferably 6 or less.
- R represents an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms which may be substituted with Z 1 , or an aryl group having 6 to 20 carbon atoms which may be substituted with Z 2.
- optionally substituted with Z 1 alkyl group or alkenyl group having 2 to 6 carbon atoms having 1 to 6 carbon atoms, or more preferably a phenyl group which may be substituted with Z 2, with Z 2
- An optionally substituted alkyl group having 1 to 4 carbon atoms or a phenyl group optionally substituted with Z 2 is more preferred, and a methyl group or ethyl group optionally substituted with Z 1 is further preferred.
- an aryl group which may having 6 to 20 carbon atoms substituted with an alkyl group or Z 4 of is 1 carbon atoms which may be ⁇ 20 substituted by Z 3, substituted by Z 3 More preferably an alkyl group having 1 to 10 carbon atoms which may be substituted or an aryl group having 6 to 14 carbon atoms which may be substituted with Z 4 , and an alkyl having 1 to 6 carbon atoms which may be substituted with Z 3 group, or more preferably more aryl group Z 4 are carbon atoms 6 also be ⁇ 10 substituted with, be substituted with an alkyl group or Z 4 of Z 3 - 1 carbon atoms which may be substituted with 4 More preferred is a phenyl group.
- a plurality of R may be all the same or different, and a plurality of R ′ may all be the same or different.
- Z 1 is preferably a halogen atom or an aryl group having 6 to 20 carbon atoms which may be substituted with Z 5 , more preferably a fluorine atom or a phenyl group which may be substituted with Z 5 , and not present ( That is, it is optimal to be unsubstituted.
- Z as a 2 a halogen atom or an alkyl group Z 5 are carbon atoms 6 also be ⁇ 20 substituted by preferably, a fluorine atom or Z 5 substituted by - 1 carbon atoms which may be 10 alkyl group More preferably, not present (ie, unsubstituted) is optimal.
- a halogen atom, Z 5 carbon atoms which may be substituted with 1 to 20 alkyl group, Z 5 in an optionally substituted furanyl group, an epoxycyclohexyl group, a glycidoxy group, a methacryloxy group, acryloxy group, ureido group, a thiol group, an isocyanate group, an amino group, an optionally substituted phenylamino group Z 5 or Z 5 may diphenylamino group are preferable optionally substituted with,, more preferably a halogen atom, It is even more preferable that the fluorine atom or not exist (that is, unsubstituted).
- Z 5 is preferably a halogen atom, more preferably a fluorine atom or not (that is, unsubstituted).
- dialkoxysilane compounds include dimethyldimethoxysilane, dimethyldiethoxysilane, methylethyldimethoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, methylpropyldimethoxysilane, methylpropyldiethoxysilane, diisopropyldimethoxysilane, and phenylmethyl.
- Dimethoxysilane vinylmethyldimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3- (3,4-epoxycyclohexyl) ethylmethyldimethoxysilane, 3-methacryloxy Propylmethyldimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-mercaptopropylmethyldimethoxysilane, ⁇ -aminopropyl Chill diethoxy silane, N- (2- aminoethyl) aminopropyl methyl dimethoxy silane, 3,3,3-trifluoropropyl methyl dimethoxy silane, and the like.
- trialkoxysilane compounds include methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, butyltrimethoxysilane, butyltriethoxysilane, Pentyltrimethoxysilane, pentyltriethoxysilane, heptyltrimethoxysilane, heptyltriethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, hexadecyltrimethoxysilane, hexadecyltriethoxy Silane, octadecyltrimethoxysilane, o
- tetraalkoxysilane compound examples include tetraethoxysilane, tetramethoxysilane, tetrapropoxysilane and the like.
- the content thereof is usually about 0.1 to 50% by mass with respect to the total mass of the charge transporting material and the dopant material.
- it is preferably 0.5 to 40. It is about mass%, more preferably about 0.8 to 30 mass%, still more preferably about 1 to 20 mass%.
- the charge transporting varnish of the present invention may use other known charge transporting materials in addition to the above-described charge transporting material comprising an aniline derivative.
- a highly soluble solvent that can dissolve the aniline derivative of the present invention well can be used.
- An aniline derivative having a silyl group can be dissolved in a solvent regardless of the polarity of the solvent.
- a low polarity solvent is defined as one having a relative dielectric constant of less than 7 at a frequency of 100 kHz
- a high polarity solvent is defined as one having a relative dielectric constant of 7 or more at a frequency of 100 kHz.
- Chlorinated solvents such as chloroform and chlorobenzene
- Aromatic hydrocarbon solvents such as toluene, xylene, tetralin, cyclohexylbenzene, decylbenzene
- Aliphatic alcohol solvents such as 1-octanol, 1-nonanol, 1-decanol
- Ether solvents such as tetrahydrofuran, dioxane, anisole, 4-methoxytoluene, 3-phenoxytoluene, dibenzyl ether, diethylene glycol dimethyl ether, diethylene glycol butyl methyl ether, triethylene glycol dimethyl ether, triethylene glycol butyl methyl ether
- Esters such as methyl benzoate, ethyl benzoate, butyl benzoate, isoamyl benzoate, bis (2-ethylhexyl) phthalate, dibutyl maleate, dibutyl maleate, dibut
- Amide solvents such as N, N-dimethylformamide, N, N-dimethylacetamide, N, N-dimethylisobutyramide, N-methylpyrrolidone, 1,3-dimethyl-2-imidazolidinone; Ketone solvents such as ethyl methyl ketone, isophorone, cyclohexanone; Cyano solvents such as acetonitrile and 3-methoxypropionitrile; Polyhydric alcohol solvents such as ethylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, 1,3-butanediol, 2,3-butanediol; Other than aliphatic alcohols such as diethylene glycol monomethyl ether, diethylene glycol monophenyl ether, triethylene glycol monomethyl ether, dipropylene glycol monomethyl ether, benzyl alcohol, 2-phenoxyethanol, 2-benzyloxyethanol, 3-phenoxy
- a charge transporting thin film can be formed on a base material by applying the charge transporting varnish described above onto the base material and baking it.
- the method for applying the varnish is not particularly limited, and examples thereof include a dipping method, a spin coating method, a transfer printing method, a roll coating method, a brush coating, an ink jet method, and a spray method. It is preferable to adjust the viscosity and surface tension.
- the firing atmosphere is not particularly limited, and a thin film having a uniform film formation surface and a high charge transport property not only in the air atmosphere but also in an inert gas such as nitrogen or in a vacuum. Obtainable.
- the firing temperature is appropriately set within a range of about 100 to 260 ° C. in consideration of the intended use of the obtained thin film, the degree of charge transportability imparted to the obtained thin film, the type and boiling point of the solvent, and the like.
- the obtained thin film is used as a hole injection layer of an organic EL device, it is preferably about 140 to 250 ° C., more preferably about 145 to 240 ° C.
- a temperature change of two or more steps may be applied for the purpose of developing a higher uniform film forming property or causing the reaction to proceed on the substrate. What is necessary is just to perform using suitable apparatuses, such as oven.
- the thickness of the charge transporting thin film is not particularly limited, but is preferably 5 to 200 nm when used as a hole injection layer in an organic EL device.
- a method of changing the film thickness there are methods such as changing the solid content concentration in the varnish and changing the amount of the solution on the substrate during coating.
- Examples of materials used and methods for producing an OLED element using the charge transporting varnish of the present invention include the following, but are not limited thereto.
- the electrode substrate to be used is preferably cleaned in advance by liquid cleaning with a detergent, alcohol, pure water or the like.
- the anode substrate is subjected to surface treatment such as UV ozone treatment or oxygen-plasma treatment immediately before use. It is preferable.
- the anode material is mainly composed of an organic material, the surface treatment may not be performed.
- the example of the manufacturing method of the OLED element which has a positive hole injection layer which consists of a thin film obtained from the charge transportable varnish of this invention is as follows.
- the charge transporting varnish of the present invention is applied onto the anode substrate and baked to produce a hole injection layer on the electrode.
- This is introduced into a vacuum deposition apparatus, and a hole transport layer, a light emitting layer, an electron transport layer, an electron transport layer / hole block layer, and a cathode metal are sequentially deposited to form an OLED element.
- an electron blocking layer may be provided between the light emitting layer and the hole transport layer.
- anode material examples include transparent electrodes typified by indium tin oxide (ITO) and indium zinc oxide (IZO), metal anodes typified by aluminum, alloys thereof, and the like. What performed the chemical conversion process is preferable. Polythiophene derivatives and polyaniline derivatives having high charge transporting properties can also be used. Other metals constituting the metal anode include scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, yttrium, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, and cadmium.
- Materials for forming the hole transport layer include (triphenylamine) dimer derivative, [(triphenylamine) dimer] spirodimer, N, N′-bis (naphthalen-1-yl) -N, N′-bis (Phenyl) -benzidine ( ⁇ -NPD), N, N′-bis (naphthalen-2-yl) -N, N′-bis (phenyl) -benzidine, N, N′-bis (3-methylphenyl)- N, N′-bis (phenyl) -benzidine, N, N′-bis (3-methylphenyl) -N, N′-bis (phenyl) -9,9-spirobifluorene, N, N′-bis ( Naphthalen-1-yl) -N, N′-bis (phenyl) -9,9-spirobifluorene, N, N′-bis (3-methylphenyl) -N, N′-bis (phenyl) -9,9-spir
- Materials for forming the light emitting layer include tris (8-quinolinolato) aluminum (III) (Alq 3 ), bis (8-quinolinolato) zinc (II) (Znq 2 ), bis (2-methyl-8-quinolinolato) ( p-phenylphenolate) aluminum (III) (BAlq), 4,4′-bis (2,2-diphenylvinyl) biphenyl, 9,10-di (naphthalen-2-yl) anthracene, 2-t-butyl- 9,10-di (naphthalen-2-yl) anthracene, 2,7-bis [9,9-di (4-methylphenyl) -fluoren-2-yl] -9,9-di (4-methylphenyl) Fluorene, 2-methyl-9,10-bis (naphthalen-2-yl) anthracene, 2- (9,9-spirobifluoren-2-yl) -9,9-spirobifluore 2,
- luminescent dopants examples include 3- (2-benzothiazolyl) -7- (diethylamino) coumarin, 2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H, 5H, 11H-10-.
- Materials for forming the electron transport layer / hole block layer include 8-hydroxyquinolinolate-lithium, 2,2 ′, 2 ′′-(1,3,5-benztolyl) -tris (1-phenyl-1- H-benzimidazole), 2- (4-biphenyl) 5- (4-t-butylphenyl) -1,3,4-oxadiazole, 2,9-dimethyl-4,7-diphenyl-1,10- Phenanthroline, 4,7-diphenyl-1,10-phenanthroline, bis (2-methyl-8-quinolinolate) -4- (phenylphenolato) aluminum, 1,3-bis [2- (2,2′-bipyridine- 6-yl) -1,3,4-oxadiazo-5-yl] benzene, 6,6′-bis [5- (biphenyl-4-yl) -1,3,4-oxadiazo-2-yl] -2 , 2'- Pyridine, 3- (4-bi
- Materials for forming the electron injection layer include lithium oxide (Li 2 O), magnesium oxide (MgO), alumina (Al 2 O 3 ), lithium fluoride (LiF), sodium fluoride (NaF), magnesium fluoride ( MgF 2 ), cesium fluoride (CsF), strontium fluoride (SrF 2 ), molybdenum trioxide (MoO 3 ), aluminum, Li (acac), lithium acetate, lithium benzoate and the like.
- Examples of the cathode material include aluminum, magnesium-silver alloy, aluminum-lithium alloy, lithium, sodium, potassium, cesium and the like.
- Examples of the material for forming the electron blocking layer include tris (phenylpyrazole) iridium.
- the manufacturing method of the PLED element using the charge transportable varnish of this invention is not specifically limited, The following methods are mentioned.
- the hole transport polymer layer and the light emitting polymer layer are sequentially formed.
- a PLED element having a charge transporting thin film formed by the charge transporting varnish of the invention can be produced.
- the charge transporting varnish of the present invention is applied on the anode substrate to produce a hole injection layer by the above-described method, and a hole transporting polymer layer and a light emitting polymer layer are sequentially formed thereon. Then, a cathode is vapor-deposited to obtain a PLED element.
- the hole transporting polymer layer and the light emitting polymer layer can be formed by adding a solvent to a hole transporting polymer material or a light emitting polymer material, or a material obtained by adding a dopant substance to the hole transporting polymer material. And a method of forming a film by uniformly dispersing and coating the film on a hole injection layer or a hole transporting polymer layer and then firing the respective layers.
- Examples of the light-emitting polymer material include polyfluorene derivatives such as poly (9,9-dialkylfluorene) (PDAF), poly (2-methoxy-5- (2′-ethylhexoxy) -1,4-phenylenevinylene) (MEH). And polyphenylene vinylene derivatives such as -PPV), polythiophene derivatives such as poly (3-alkylthiophene) (PAT), and polyvinylcarbazole (PVCz).
- polyfluorene derivatives such as poly (9,9-dialkylfluorene) (PDAF), poly (2-methoxy-5- (2′-ethylhexoxy) -1,4-phenylenevinylene) (MEH).
- polyphenylene vinylene derivatives such as -PPV
- polythiophene derivatives such as poly (3-alkylthiophene) (PAT)
- PVCz polyvinylcarbazole
- Examples of the solvent include toluene, xylene, chloroform, and the like.
- Examples of the dissolution or uniform dispersion method include methods such as stirring, heating and stirring, and ultrasonic dispersion.
- the application method is not particularly limited, and examples thereof include an inkjet method, a spray method, a dip method, a spin coating method, a transfer printing method, a roll coating method, and a brush coating method.
- the application is preferably performed under an inert gas such as nitrogen or argon.
- Examples of the firing method include a method of heating in an oven or a hot plate under an inert gas or in a vacuum.
- the vapor deposition film obtained from the aniline derivative of the present invention is also excellent in charge transportability.
- a conductive thin film may be used.
- the charge transporting varnish of the present invention is suitably used for forming a hole injection layer or a hole transport layer of an organic EL device as described above.
- an organic photoelectric conversion device, an organic thin film solar cell, an organic perovskite Photoelectric conversion device, organic integrated circuit, organic field effect transistor, organic thin film transistor, organic light emitting transistor, organic optical inspection device, organic photoreceptor, organic electric field quenching device, light emitting electrochemical cell, quantum dot light emitting diode, quantum laser, organic laser It can also be used to form charge transporting thin films in electronic devices such as diodes and organic plasmon light emitting devices.
- a flask was charged with 2.65 g of TBSCZ3, 3.74 g of TPA-Br, 121 mg of Pd (dba) 2 and 1.42 g of sodium t-butoxy, and the atmosphere in the flask was replaced with nitrogen.
- 80 mL of toluene and 1.6 mL (concentration: 60 g / L) of a toluene solution of di-t-butyl (phenyl) phosphine prepared in advance were added and stirred at 90 ° C. After 4 hours, the reaction solution was cooled to room temperature, and 100 mL of ion exchange water was mixed to perform a liquid separation treatment.
- the organic layer was washed with an aqueous solution of 5% sodium N, N-diethyldithiocarbamate trihydrate, ion-exchanged water and saturated saline, and 0.1 g of Shirakaba P activated carbon (manufactured by Osaka Gas Chemical) was added at room temperature. After stirring for 1 hour, silica gel filtration was performed, and the cake was washed with toluene. After concentrating the filtrate, the obtained crude product was dissolved in 50 mL of toluene, added dropwise to a premixed solution of 375 mL of methanol and 125 mL of ethyl acetate, and the resulting slurry was stirred at room temperature. After 3 days, the slurry was filtered, and the filtrate was dried to obtain 3TPA-TBSCz3 (yield: 4.80 g, yield: 92%).
- the measurement result of 1 H-NMR is shown below.
- the raw material TBSCZ3 was obtained as follows.
- Example 2-2 In a mixed solvent consisting of 3-phenoxytoluene (1.5 g) and butyl benzoate (3.5 g), the aniline derivative TBSCz5 (0.064 g), the aniline derivative 21F-3TCz-TRI3 (0.018 g), and aryl sulfonic acid Ester (0.126 g) was added and stirred to prepare a charge transporting varnish A-2.
- Example 2-3 After dissolving arylsulfonic acid (0.099 g) in a mixed solvent consisting of DMI (1.65 g), 2,3-butanediol (2 g) and DPM (1.35 g), the aniline derivative 3TBSCz-TRI3 (0.056 g) And TEMPO (0.012 g) were added and stirred with heating to prepare a charge transporting varnish B-1.
- Example 2-4 An aniline derivative 3TBSCz-TRI3 (0.062 g), 21F-3TCz-TRI3 (0.019 g), and arylsulfonic acid in a mixed solvent consisting of 3-phenoxytoluene (1.5 g) and butyl benzoate (3.5 g) Ester (0.127 g) was added and stirred to prepare a charge transporting varnish B-2.
- Example 2-5 After dissolving arylsulfonic acid (0.100 g) in a mixed solvent consisting of DMI (1.65 g), 2,3-butanediol (2 g) and DPM (1.35 g), the aniline derivative 3TPA-TBSCz3 (0.055 g) And TEMPO (0.012 g) were added and stirred with heating to prepare a charge transporting varnish C-1.
- Example 2-6 In a mixed solvent consisting of 3-phenoxytoluene (1.5 g) and butyl benzoate (3.5 g), the aniline derivative 3TPA-TBSCz3 (0.061 g), 21F-3TCz-TRI3 (0.019 g), and aryl sulfonic acid Ester (0.128 g) was added and stirred to prepare a charge transporting varnish C-2.
- the aniline derivative 3Cz-TRI3 was synthesized by the following method.
- Example 3-1 After the charge transporting varnish A-1 was applied to the ITO substrate using a spin coater, it was pre-fired at 120 ° C. for 1 minute in the atmosphere, and then main-baked at 230 ° C. for 15 minutes to form on the ITO substrate. A 50 nm thin film was formed. On top of that, ⁇ -NPD and an aluminum thin film were sequentially laminated using a vapor deposition apparatus (vacuum degree: 2.0 ⁇ 10 ⁇ 5 Pa) to obtain HOD. Vapor deposition was performed at a deposition rate of 0.2 nm / second. The film thicknesses of the ⁇ -NPD and aluminum thin films were 30 nm and 80 nm, respectively.
- the characteristic was evaluated. Sealing was performed according to the following procedure. In a nitrogen atmosphere with an oxygen concentration of 10 ppm or less and a dew point of -75 ° C or less, the HOD is placed between the sealing substrates, and the sealing substrate is bonded with an adhesive (MORESCO's Mores Moisture Cut WB90US (P)). It was. At this time, a water catching agent (HD-071010W-40 manufactured by Dynic Co., Ltd.) was placed in a sealing substrate together with HOD. The bonded sealing substrate was irradiated with UV light (wavelength 365 nm, irradiation amount 6,000 mJ / cm 2 ), and then annealed at 80 ° C. for 1 hour to cure the adhesive.
- UV light wavelength 365 nm, irradiation amount 6,000 mJ / cm 2
- Example 3-2 A HOD was produced in the same manner as in Example 3-1, except that the charge transporting varnish A-2 was used instead of the charge transporting varnish A-1.
- Example 3-3 A HOD was produced in the same manner as in Example 3-1, except that the charge transporting varnish B-1 was used instead of the charge transporting varnish A-1.
- Example 3-4 A HOD was produced in the same manner as in Example 3-1, except that the charge transporting varnish B-2 was used instead of the charge transporting varnish A-1.
- Example 3-5 A HOD was produced in the same manner as in Example 3-1, except that the charge transporting varnish C-1 was used instead of the charge transporting varnish A-1.
- the HOD prepared using the polar solvent varnish containing the aniline derivative of the present invention and the non-polar solvent varnish is the same as the HOD prepared using the polar solvent varnish containing the aniline derivative of the comparative example.
- the current characteristics are equivalent or better.
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Abstract
Description
正孔注入層の形成方法は、蒸着法に代表されるドライプロセスと、スピンコート法に代表されるウェットプロセスとに大別され、これら各プロセスを比べると、ウェットプロセスの方が大面積に平坦性の高い薄膜を効率的に製造できる。それゆえ、有機ELディスプレイの大面積化が進められている現在、ウェットプロセスで形成可能な正孔注入層が望まれている。
このような事情に鑑み、本発明者らは、各種ウェットプロセスに適用可能であるとともに、有機EL素子の正孔注入層に適用した場合に優れたEL素子特性を実現できる薄膜を与える電荷輸送性材料や、それに用いる有機溶媒に対する溶解性の良好な化合物を開発してきている(例えば特許文献1~4参照)。
1. 式(1)で表されるアニリン誘導体、
で表される基であり、R1~R5の少なくとも1つは式(3)で表される基である。〕
2. 前記R1~R5が、全て式(3)で表される基である1のアニリン誘導体、
3. 前記R6~R8が、炭素数1~10のアルキル基または炭素数6~10のアリール基である1または2のアニリン誘導体、
4. 前記R6~R8の2つがメチル基で、残り1つがt-ブチル基である3のアニリン誘導体、
5. 1~4のいずれかのアニリン誘導体からなる電荷輸送性物質、
6. 5の電荷輸送性物質を含む電荷輸送性材料、
7. 5の電荷輸送性物質と、有機溶媒とを含む電荷輸送性ワニス、
8. 更にドーパントを含む7の電荷輸送性ワニス、
9. 前記ドーパントが、アリールスルホン酸およびアリールスルホン酸エステルから選ばれる少なくとも1種である8の電荷輸送性ワニス、
10. 7~9のいずれかの電荷輸送性用ワニスを用いて作製される電荷輸送性薄膜、
11. 10の電荷輸送性薄膜を有する電子素子、
12. 10の電荷輸送性薄膜を有する有機エレクトロルミネッセンス素子、
13. 前記電荷輸送性薄膜が、正孔注入層または正孔輸送層である12の有機エレクトロルミネッセンス素子、
14. 式(1’)
で表される基であるが、R1'~R5'の少なくとも1つは水素原子である。〕
で表されるアミン化合物を、触媒および塩基の存在下、式(3’)
で表されるカルバゾール化合物とカップリング反応させることを特徴とする式(1)
で表される基であるが、R1~R5の少なくとも1つは式(3)で表される基である。〕
で表されるアニリン誘導体の製造方法
を提供する。
本発明の電荷輸送性ワニスから作製した薄膜は高い電荷輸送性を示すため、有機EL素子をはじめとした電子デバイス用薄膜として好適に用いることができる。特に、この薄膜を有機EL素子の正孔注入層に適用することで、輝度特性に優れた有機EL素子を得ることができる。
また、本発明の電荷輸送性ワニスは、スピンコート法やスリットコート法等、大面積に成膜可能な各種ウェットプロセスを用いた場合でも電荷輸送性に優れた薄膜を再現性よく製造できるため、近年の有機EL素子の分野における進展にも十分対応できる。
本発明に係るアニリン誘導体は、式(1)で表される。
また、Ar3は、ベンゼン-1,2-ジイル基、ベンゼン-1,3-ジイル基、ベンゼン-1,4-ジイル基が好ましく、ベンゼン-1,4-ジイル基がより好ましい。
したがって、式(2)で表される基は、式(2A)で表される基が好ましく、式(2A-1)で表される基がより好ましい。
より具体的には、R6~R8の2つがメチル基で、残りの1つがt-ブチル基の組み合わせ、R6~R8の2つがフェニル基で、残りの1つがt-ブチル基の組み合わせ、R6~R8がすべてイソプロピル基のものが好ましく、R6~R8の2つがメチル基で、残りの1つがt-ブチル基の組み合わせがより好ましい。
なお、式(3’)で表される化合物は、対応するカルバゾールを、NaH等の塩基存在下、トリアルキルシリルクロライド等のトリオルガノハライドと反応させる公知の手法によって得ることができる。
式(3’)において、R6~R8は、前記式(3)で説明したものと同様であり、Xは、ハロゲン原子または擬ハロゲン原子を表す。
擬ハロゲン基としては、メタンスルホニルオキシ基、トリフルオロメタンスルホニルオキシ基、ノナフルオロブタンスルホニルオキシ基等の(フルオロ)アルキルスルホニルオキシ基;ベンゼンスルホニルオキシ基、トルエンスルホニルオキシ基等の芳香族スルホニルオキシ基等が挙げられる。
これらの中でも、原料の入手性や反応性等を考慮すると、Xは、ハロゲン原子が好ましく、臭素原子、ヨウ素原子がより好ましい。
また、Xの置換位置は特に限定されるものではないが、カルバゾールの窒素原子に対してパラ位が好ましい。
このような配位子としては、トリフェニルフォスフィン、トリ-o-トリルフォスフィン、ジフェニルメチルフォスフィン、フェニルジメチルフォスフィン、トリメチルフォスフィン、トリエチルフォスフィン、トリブチルフォスフィン、トリ-t-ブチルフォスフィン、ジ-t-ブチル(フェニル)フォスフィン、ジ-t-ブチル(4-ジメチルアミノフェニル)フォスフィン、1,2-ビス(ジフェニルフォスフィノ)エタン、1,3-ビス(ジフェニルフォスフィノ)プロパン、1,4-ビス(ジフェニルフォスフィノ)ブタン、1,1’-ビス(ジフェニルフォスフィノ)フェロセン等の3級フォスフィン、トリメチルフォスファイト、トリエチルフォスファイト、トリフェニルフォスファイト等の3級フォスファイト等が挙げられるが、本発明では、ジ-t-ブチル(フェニル)フォスフィンが好適に用いられる。
また、配位子を用いる場合、その使用量は、使用する金属錯体に対し0.1~5当量とすることができるが、1~2当量が好適である。
これらの中でも、特に、芳香族炭化水素類が好ましく、トルエンがより好ましい。
反応終了後は、常法にしたがって後処理をし、目的とするアニリン誘導体(カップリング生成物)を得ることができる。
ドーパント物質としては、ワニスに使用する少なくとも一種の溶媒に溶解するものであれば特に限定されず、無機系のドーパント物質、有機系のドーパント物質のいずれも使用できる。
特に、1種類のヘテロポリ酸を用いる場合、その1種類のヘテロポリ酸は、リンタングステン酸またはリンモリブデン酸が好ましく、リンタングステン酸が最適である。また、2種類以上のヘテロポリ酸を用いる場合、その2種類以上のヘテロポリ酸の1つは、リンタングステン酸またはリンモリブデン酸が好ましく、リンタングステン酸がより好ましい。
なお、ヘテロポリ酸は、元素分析等の定量分析において、一般式で示される構造から元素の数が多いもの、または少ないものであっても、それが市販品として入手したもの、あるいは、公知の合成方法にしたがって適切に合成したものである限り、本発明において用いることができる。
すなわち、例えば、一般的には、リンタングステン酸は化学式H3(PW12O40)・nH2Oで、リンモリブデン酸は化学式H3(PMo12O40)・nH2Oでそれぞれ示されるが、定量分析において、この式中のP(リン)、O(酸素)またはW(タングステン)もしくはMo(モリブデン)の数が多いもの、または少ないものであっても、それが市販品として入手したもの、あるいは、公知の合成方法にしたがって適切に合成したものである限り、本発明において用いることができる。この場合、本発明に規定されるヘテロポリ酸の質量とは、合成物や市販品中における純粋なリンタングステン酸の質量(リンタングステン酸含量)ではなく、市販品として入手可能な形態および公知の合成法にて単離可能な形態において、水和水やその他の不純物等を含んだ状態での全質量を意味する。
更に、Ara1~Ara4のうち少なくとも1つの基が、フッ素原子または塩素原子を置換基として1つまたは2つ以上有することがより好ましい。特に、Ara1~Ara4の水素原子がすべてフッ素原子で置換されたパーフルオロアリール基であることが最も好ましい。パーフルオロアリール基の具体例としては、ペンタフルオロフェニル基、ヘプタフルオロ-2-ナフチル基、テトラフルオロ-4-ピリジル基等が挙げられる。
Xaは化合物の安定性、合成および精製のし易さの点からフッ素原子、塩素原子であることが好ましく、フッ素原子であることが最も好ましい。
前記金属イオンとしては、1価の金属イオンが好ましく、Li+、Na+、K+およびAg+等が挙げられるが、特に、Ag+が好ましい。
前記オニウムイオンとしては、ヨードニウムイオン、スルホニウムイオン、アンモニウムイオンおよびホスホニウムイオン等が挙げられるが、特に、下記式(10)で表されるヨードニウムイオンが好ましい。
また、必要に応じて公知のその他のオニウムボレート塩を併用してもよい。
なお、前記オニウムボレート塩は、例えば、特開2005-314682号公報等に記載された公知の方法を参考に合成することができる。
このような有機溶媒としては、プロピレンカーボネート、エチレンカーボネート、1,2-ブチレンカーボネート、ジメチルカーボネート、ジエチルカーボネート等のカーボネート類;アセトン、メチルエチルケトン、シクロヘキサノン、メチルイソアミルケトン、2-ヘプタノン等のケトン類;エチレングリコール、エチレングリコールモノアセテート、ジエチレングリコール、ジエチレングリコールモノアセテート、プロピレングリコール、プロピレングリコールモノアセテート、ジプロピレングリコール、ジプロピレングリコールモノアセテートのモノメチルエーテル、モノエチルエーテル、モノプロピルエーテル、モノブチルエーテルまたはモノフェニルエーテル等の多価アルコールおよびその誘導体類;ジオキサン等の環式エーテル類;蟻酸エチル、乳酸メチル、乳酸エチル、酢酸メチル、酢酸エチル、酢酸ブチル、ピルビン酸メチル、アセト酢酸メチル、アセト酢酸エチル、ピルビン酸エチル、エトキシ酢酸エチル、メトキシプロピオン酸メチル、エトキシプロピオン酸エチル、2-ヒドロキシプロピオン酸メチル、2-ヒドロキシプロピオン酸エチル、2-ヒドロキシ-2-メチルプロピオン酸エチル、2-ヒドロキシ-3-メチルブタン酸メチル、3-メトキシブチルアセテート、3-メチル-3-メトキシブチルアセテート等のエステル類;トルエン、キシレン、3-フェノキシトルエン、4-メトキシトルエン、安息香酸メチル、シクロヘキシルベンゼン、テトラリン、イソホロン等の芳香族炭化水素類等が挙げられ、これらは単独で用いても、2種以上組み合わせて用いてもよい。
有機溶媒を使用する場合、その使用割合は、前記オニウムボレート塩100質量部に対して、15~1,000質量部が好ましく、30~500質量部がより好ましい。
ベンゾキノン誘導体の具体例としては、テトラフルオロ-1,4-ベンゾキノン、テトラクロロ-1,4-ベンゾキノン(クロラニル)、2,3-ジクロロ-5,6-ジシアノ-1,4-ベンゾキノン(DDQ)等が挙げられる。
これら無機系および有機系のドーパント物質は、1種類単独で用いてもよく、2種類以上組み合わせて用いてもよい。
ハロゲン原子としては前記と同じものが挙げられるが、フッ素原子または塩素原子が好ましく、フッ素原子がより好ましい。
有機シラン化合物としては、ジアルコキシシラン化合物、トリアルコキシシラン化合物またはテトラアルコキシシラン化合物が挙げられ、これらは単独で用いても、2種以上組み合わせて用いてもよい。
とりわけ、有機シラン化合物としては、ジアルコキシシラン化合物またはトリアルコキシシラン化合物が好ましく、トリアルコキシシラン化合物がより好ましい。
Si(OR)4 (16)
SiR′(OR)3 (17)
Si(R′)2(OR)2 (18)
Z5は、ハロゲン原子、アミノ基、ニトロ基、シアノ基またはチオール基を表す。
RおよびR′において、アルキル基、アルケニル基およびアルキニル基の炭素数は、好ましくは10以下であり、より好ましくは6以下であり、より一層好ましくは4以下である。
また、アリール基およびヘテロアリール基の炭素数は、好ましくは14以下であり、より好ましくは10以下であり、より一層好ましくは6以下である。
Rとしては、Z1で置換されていてもよい、炭素数1~20のアルキル基もしくは炭素数2~20のアルケニル基、またはZ2で置換されていてもよい炭素数6~20のアリール基が好ましく、Z1で置換されていてもよい、炭素数1~6のアルキル基もしくは炭素数2~6のアルケニル基、またはZ2で置換されていてもよいフェニル基がより好ましく、Z2で置換されていてもよい炭素数1~4のアルキル基またはZ2で置換されていてもよいフェニル基がより一層好ましく、Z1で置換されていてもよい、メチル基またはエチル基が更に好ましい。
また、R′としては、Z3で置換されていてもよい炭素数1~20のアルキル基またはZ4で置換されていてもよい炭素数6~20のアリール基が好ましく、Z3で置換されていてもよい炭素数1~10のアルキル基またはZ4で置換されていてもよい炭素数6~14のアリール基がより好ましく、Z3で置換されていてもよい炭素数1~6のアルキル基、またはZ4で置換されていてもよい炭素数6~10のアリール基がより一層好ましく、Z3で置換されていてもよい炭素数1~4のアルキル基またはZ4で置換されていてもよいフェニル基が更に好ましい。
なお、複数のRは、すべて同一でも異なっていてもよく、複数のR′も、すべて同一でも異なっていてもよい。
また、Z2としては、ハロゲン原子またはZ5で置換されていてもよい炭素数6~20のアルキル基が好ましく、フッ素原子またはZ5で置換されていてもよい炭素数1~10アルキル基がより好ましく、存在しないこと(すなわち、非置換であること)が最適である。
また、Z4としては、ハロゲン原子、Z5で置換されていてもよい炭素数1~20のアルキル基、Z5で置換されていてもよいフラニル基、エポキシシクロヘキシル基、グリシドキシ基、メタクリロキシ基、アクリロキシ基、ウレイド基、チオール基、イソシアネート基、アミノ基、Z5で置換されていてもよいフェニルアミノ基、またはZ5で置換されていてもよいジフェニルアミノ基が好ましく、ハロゲン原子がより好ましく、フッ素原子、または存在しないこと(すなわち、非置換であること)がより一層好ましい。
そして、Z5としては、ハロゲン原子が好ましく、フッ素原子または存在しないこと(すなわち、非置換であること)がより好ましい。
ジアルコキシシラン化合物の具体例としては、ジメチルジメトキシシラン、ジメチルジエトキシシラン、メチルエチルジメトキシシラン、ジエチルジメトキシシラン、ジエチルジエトキシシラン、メチルプロピルジメトキシシラン、メチルプロピルジエトキシシラン、ジイソプロピルジメトキシシラン、フェニルメチルジメトキシシラン、ビニルメチルジメトキシシラン、3-グリシドキシプロピルメチルジメトキシシシラン、3-グリシドキシプロピルメチルジエトキシシシラン、3-(3,4-エポキシシクロヘキシル)エチルメチルジメトキシシラン、3-メタクリロキシプロピルメチルジメトキシシラン、3-メタクリロキシプロピルメチルジエトキシシラン、3-メルカプトプロピルメチルジメトキシシラン、γ-アミノプロピルメチルジエトキシシラン、N-(2-アミノエチル)アミノプロピルメチルジメトキシシラン、3,3,3-トリフルオロプロピルメチルジメトキシシラン等が挙げられる。
クロロホルム、クロロベンゼン等の塩素系溶媒;
トルエン、キシレン、テトラリン、シクロヘキシルベンゼン、デシルベンゼン等の芳香族炭化水素系溶媒;
1-オクタノール、1-ノナノール、1-デカノール等の脂肪族アルコール系溶媒;
テトラヒドロフラン、ジオキサン、アニソール、4-メトキシトルエン、3-フェノキシトルエン、ジベンジルエーテル、ジエチレングリコールジメチルエーテル、ジエチレングリコールブチルメチルエーテル、トリエチレングリコールジメチルエーテル、トリエチレングリコールブチルメチルエーテル等のエーテル系溶媒;
安息香酸メチル、安息香酸エチル、安息香酸ブチル、安息香酸イソアミル、フタル酸ビス(2-エチルヘキシル)、マレイン酸ジブチル、シュウ酸ジブチル、酢酸ヘキシル、ジエチレングリコールモノエチルエーテルアセテート、ジエチレングリコールモノブチルエーテルアセテート等のエステル系溶媒
等が挙げられる。
N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド、N,N-ジメチルイソブチルアミド、N-メチルピロリドン、1,3-ジメチル-2-イミダゾリジノン等のアミド系溶媒;
エチルメチルケトン、イソホロン、シクロヘキサノン等のケトン系溶媒;
アセトニトリル、3-メトキシプロピオニトリル等のシアノ系溶媒;
エチレングリコール、ジエチレングリコール、トリエチレングリコール、ジプロピレングリコール、1,3-ブタンジオール、2,3-ブタンジオール等の多価アルコール系溶媒;
ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノフェニルエーテル、トリエチレングリコールモノメチルエーテル、ジプロピレングリコールモノメチルエーテル、ベンジルアルコール、2-フェノキシエタノール、2-ベンジルオキシエタノール、3-フェノキシベンジルアルコール、テトラヒドロフルフリルアルコール等の脂肪族アルコール以外の1価アルコール系溶媒;
ジメチルスルホキシド等のスルホキシド系溶媒
等が挙げられる。
ワニスの塗布方法としては、特に限定されるものではなく、ディップ法、スピンコート法、転写印刷法、ロールコート法、刷毛塗り、インクジェット法、スプレー法等が挙げられ、塗布方法に応じてワニスの粘度および表面張力を調節することが好ましい。
なお、焼成の際、より高い均一成膜性を発現させたり、基材上で反応を進行させたりする目的で、2段階以上の温度変化をつけてもよく、加熱は、例えば、ホットプレートやオーブン等、適当な機器を用いて行えばよい。
使用する電極基板は、洗剤、アルコール、純水等による液体洗浄を予め行って浄化しておくことが好ましく、例えば、陽極基板では使用直前にUVオゾン処理、酸素-プラズマ処理等の表面処理を行うことが好ましい。ただし陽極材料が有機物を主成分とする場合、表面処理を行わなくともよい。
前記の方法により、陽極基板上に本発明の電荷輸送性ワニスを塗布して焼成し、電極上に正孔注入層を作製する。これを真空蒸着装置内に導入し、正孔輸送層、発光層、電子輸送層、電子輸送層/ホールブロック層、陰極金属を順次蒸着してOLED素子とする。なお、必要に応じて、発光層と正孔輸送層との間に電子ブロック層を設けてよい。
陽極材料としては、インジウム錫酸化物(ITO)、インジウム亜鉛酸化物(IZO)に代表される透明電極や、アルミニウムに代表される金属やこれらの合金等から構成される金属陽極が挙げられ、平坦化処理を行ったものが好ましい。高電荷輸送性を有するポリチオフェン誘導体やポリアニリン誘導体を用いることもできる。
なお、金属陽極を構成するその他の金属としては、スカンジウム、チタン、バナジウム、クロム、マンガン、鉄、コバルト、ニッケル、銅、亜鉛、ガリウム、イットリウム、ジルコニウム、ニオブ、モリブデン、ルテニウム、ロジウム、パラジウム、カドニウム、インジウム、スカンジウム、ランタン、セリウム、プラセオジム、ネオジム、プロメチウム、サマリウム、ユウロピウム、ガドリニウム、テルビウム、ジスプロシウム、ホルミウム、エルビウム、ツリウム、イッテルビウム、ハフニウム、タリウム、タングステン、レニウム、オスミウム、イリジウム、プラチナ、金、チタン、鉛、ビスマスやこれらの合金等が挙げられるが、これらに限定されるわけではない。
陰極材料としては、アルミニウム、マグネシウム-銀合金、アルミニウム-リチウム合金、リチウム、ナトリウム、カリウム、セシウム等が挙げられる。
電子ブロック層を形成する材料としては、トリス(フェニルピラゾール)イリジウム等が挙げられる。
前記OLED素子作製において、正孔輸送層、発光層、電子輸送層、電子注入層の真空蒸着操作を行う代わりに、正孔輸送性高分子層、発光性高分子層を順次形成することによって本発明の電荷輸送性ワニスによって形成される電荷輸送性薄膜を有するPLED素子を作製することができる。
具体的には、陽極基板上に本発明の電荷輸送性ワニスを塗布して前記の方法により正孔注入層を作製し、その上に正孔輸送性高分子層、発光性高分子層を順次形成し、更に陰極を蒸着してPLED素子とする。
正孔輸送性高分子層および発光性高分子層の形成法としては、正孔輸送性高分子材料もしくは発光性高分子材料、またはこれらにドーパント物質を加えた材料に溶媒を加えて溶解するか、均一に分散し、正孔注入層または正孔輸送性高分子層の上に塗布した後、それぞれ焼成することで成膜する方法が挙げられる。
塗布方法としては、特に限定されるものではなく、インクジェット法、スプレー法、ディップ法、スピンコート法、転写印刷法、ロールコート法、刷毛塗り等が挙げられる。なお、塗布は、窒素、アルゴン等の不活性ガス下で行うことが好ましい。
焼成する方法としては、不活性ガス下または真空中、オーブンまたはホットプレートで加熱する方法が挙げられる。
(1)1H-NMR:ブルカー・バイオスピン(株)製 核磁気共鳴分光計 AVANCE III HD 500MHz
(2)基板洗浄:長州産業(株)製 基板洗浄装置(減圧プラズマ方式)
(3)ワニスの塗布:ミカサ(株)製 スピンコーターMS-A100
(4)膜厚測定:(株)小坂研究所製 微細形状測定機サーフコーダET-4000
(5)EL素子の作製:長州産業(株)製 多機能蒸着装置システムC-E2L1G1-N
(6)EL素子の輝度等の測定:(有)テック・ワールド製 I-V-L測定システム
下記式で示されるTBSCZ-BrをChemistry of Materials (2015), 27(19), 6535-6542.に従って合成した(以下、同様)。
8.31-8.01(m,8H),7.95(d,J=2.3Hz,2H),7.65(t,J=7.6Hz,4H),7.55-7.12(m,30H),7.04-6.90(m,14H),1.00(s,18H),0.74(s,12H).
[実施例2-1]
1,3-ジメチル-2-イミダゾリジノン(DMI)(1.65g)、2,3-ブタンジオール(2g)およびジプロピレングリコールモノメチルエーテル(DPM)(1.35g)からなる混合溶媒にアリールスルホン酸(0.097g)を溶解後、アニリン誘導体TBSCz5(0.057g)と、2,2,6,6-テトラメチルピペリジン-N-オキシル(TEMPO)(東京化成工業(株)製)(0.012g)とを加え加熱撹拌し、電荷輸送性ワニスA-1を調製した。
3-フェノキシトルエン(1.5g)および安息香酸ブチル(3.5g)からなる混合溶媒にアニリン誘導体TBSCz5(0.064g)と、アニリン誘導体21F-3TCz-TRI3(0.018g)と、アリールスルホン酸エステル(0.126g)とを加え撹拌し、電荷輸送性ワニスA-2を調製した。
DMI(1.65g)、2,3-ブタンジオール(2g)およびDPM(1.35g)からなる混合溶媒にアリールスルホン酸(0.099g)を溶解後、アニリン誘導体3TBSCz-TRI3(0.056g)と、TEMPO(0.012g)とを加え加熱撹拌し、電荷輸送性ワニスB-1を調製した。
3-フェノキシトルエン(1.5g)および安息香酸ブチル(3.5g)からなる混合溶媒にアニリン誘導体3TBSCz-TRI3(0.062g)と、21F-3TCz-TRI3(0.019g)と、アリールスルホン酸エステル(0.127g)とを加え撹拌し、電荷輸送性ワニスB-2を調製した。
DMI(1.65g)、2,3-ブタンジオール(2g)およびDPM(1.35g)からなる混合溶媒にアリールスルホン酸(0.100g)を溶解後、アニリン誘導体3TPA-TBSCz3(0.055g)と、TEMPO(0.012g)とを加え加熱撹拌し、電荷輸送性ワニスC-1を調製した。
3-フェノキシトルエン(1.5g)および安息香酸ブチル(3.5g)からなる混合溶媒にアニリン誘導体3TPA-TBSCz3(0.061g)と、21F-3TCz-TRI3(0.019g)と、アリールスルホン酸エステル(0.128g)とを加え撹拌し、電荷輸送性ワニスC-2を調製した。
DMI(1.65g)、2,3-ブタンジオール(2g)およびDPM(1.35g)からなる混合溶媒にアリールスルホン酸(0.108g)を溶解後、下記式で示されるアニリン誘導体3Cz-TRI3(0.047g)と、TEMPO(0.012g)とを加え加熱撹拌し、電荷輸送性ワニスD-1を調製した。
3-フェノキシトルエン(1.5g)および安息香酸ブチル(3.5g)からなる混合溶媒にアニリン誘導体3Cz-TRI3(0.052g)、21F-3TCz-TRI3(0.020g)と、アリールスルホン酸エステル(0.137g)とを加え撹拌し、電荷輸送性ワニスD-2を調製したが、完全溶解せず、薄膜の形成に使用し得るワニスは得られなかった。
以下の実施例および比較例において、ITO基板としては、ITOが表面上に膜厚150nmでパターニングされた25mm×25mm×0.7tのガラス基板を用い、使用前にO2プラズマ洗浄装置(150W、30秒間)によって表面上の不純物を除去したものを使用した。
電荷輸送性ワニスA-1を、スピンコーターを用いてITO基板に塗布した後、大気下で、120℃で1分間仮焼成をし、次いで230℃で15分間本焼成をし、ITO基板上に50nmの薄膜を形成した。
その上に、蒸着装置(真空度2.0×10-5Pa)を用いてα-NPDおよびアルミニウムの薄膜を順次積層し、HODを得た。蒸着は、蒸着レート0.2nm/秒の条件で行った。α-NPDおよびアルミニウムの薄膜の膜厚は、それぞれ30nmおよび80nmとした。
なお、空気中の酸素、水等の影響による特性劣化を防止するため、HODは封止基板により封止した後、その特性を評価した。封止は、以下の手順で行った。
酸素濃度10ppm以下、露点-75℃以下の窒素雰囲気中で、HODを封止基板の間に収め、封止基板を接着材((株)MORESCO製モレスコモイスチャーカットWB90US(P))により貼り合わせた。この際、捕水剤(ダイニック(株)製HD-071010W-40)をHODと共に封止基板内に収めた。貼り合わせた封止基板に対し、UV光を照射(波長365nm、照射量6,000mJ/cm2)した後、80℃で1時間、アニーリング処理して接着材を硬化させた。
電荷輸送性ワニスA-1のかわりに電荷輸送性ワニスA-2を用いた以外は、実施例3-1と同様の方法でHODを作製した。
電荷輸送性ワニスA-1のかわりに電荷輸送性ワニスB-1を用いた以外は、実施例3-1と同様の方法でHODを作製した。
電荷輸送性ワニスA-1のかわりに電荷輸送性ワニスB-2を用いた以外は、実施例3-1と同様の方法でHODを作製した。
電荷輸送性ワニスA-1のかわりに電荷輸送性ワニスC-1を用いた以外は、実施例3-1と同様の方法でHODを作製した。
電荷輸送性ワニスA-1のかわりに電荷輸送性ワニスD-1を用いた以外は、実施例3-1と同様の方法でHODを作製した。
Claims (14)
- 式(1)で表されるアニリン誘導体。
〔式中、R1~R5は、互いに独立して、水素原子、式(2)または式(3)
(式中、Ar1およびAr2は、互いに独立して、炭素数6~20のアリール基を表し、Ar3は、炭素数6~20のアリーレン基を表すが、Ar1~Ar3のいずれか2つが互いに結合して窒素原子とともに環を形成していてもよく、R6~R8は、互いに独立して、W1で置換されてもよい、炭素数1~20のアルキル基または炭素数6~20のアリール基を表し、W1は、ハロゲン原子、ニトロ基、炭素数1~20のアルコキシ基またはシアノ基を表す。)
で表される基であり、R1~R5の少なくとも1つは式(3)で表される基である。〕 - 前記R1~R5が、全て式(3)で表される基である請求項1記載のアニリン誘導体。
- 前記R6~R8が、炭素数1~10のアルキル基または炭素数6~10のアリール基である請求項1または2記載のアニリン誘導体。
- 前記R6~R8の2つがメチル基で、残り1つがt-ブチル基である請求項3記載のアニリン誘導体。
- 請求項1~4のいずれか1項記載のアニリン誘導体からなる電荷輸送性物質。
- 請求項5記載の電荷輸送性物質を含む電荷輸送性材料。
- 請求項5記載の電荷輸送性物質と、有機溶媒とを含む電荷輸送性ワニス。
- 更にドーパントを含む請求項7記載の電荷輸送性ワニス。
- 前記ドーパントが、アリールスルホン酸およびアリールスルホン酸エステルから選ばれる少なくとも1種である請求項8記載の電荷輸送性ワニス。
- 請求項7~9のいずれか1項記載の電荷輸送性用ワニスを用いて作製される電荷輸送性薄膜。
- 請求項10記載の電荷輸送性薄膜を有する電子素子。
- 請求項10記載の電荷輸送性薄膜を有する有機エレクトロルミネッセンス素子。
- 前記電荷輸送性薄膜が、正孔注入層または正孔輸送層である請求項12記載の有機エレクトロルミネッセンス素子。
- 式(1’)
〔式中、R1’~R5’は、互いに独立して、水素原子または式(2)
(式中、Ar1およびAr2は、互いに独立して、炭素数6~20のアリール基を表し、Ar3は、炭素数6~20のアリーレン基を表すが、Ar1~Ar3のいずれか2つが互いに結合して窒素原子とともに環を形成していてもよい。)
で表される基であるが、R1’~R5’の少なくとも1つは水素原子である。〕
で表されるアミン化合物を、触媒および塩基の存在下、式(3’)
(式中、Xは、ハロゲン原子または擬ハロゲン原子を表し、R6~R8は、互いに独立して、W1で置換されてもよい、炭素数1~20のアルキル基または炭素数6~20のアリール基を表し、W1は、炭素数1~20のアルコキシ基、ハロゲン原子、ニトロ基またはシアノ基を表す。)
で表されるカルバゾール化合物とカップリング反応させることを特徴とする式(1)
〔式中、R1~R5は、互いに独立して、水素原子、式(2)または式(3)
(式中、Ar1~Ar3およびR6~R8は、前記と同じ意味を表す。)
で表される基であるが、R1~R5の少なくとも1つは式(3)で表される基である。〕
で表されるアニリン誘導体の製造方法。
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| KR101493435B1 (ko) | 2006-09-13 | 2015-02-13 | 닛산 가가쿠 고교 가부시키 가이샤 | 올리고아닐린 화합물 |
| KR20110081274A (ko) * | 2008-11-07 | 2011-07-13 | 호도가야 가가쿠 고교 가부시키가이샤 | 트리페닐실릴기와 트리아릴아민 구조를 가진 화합물 및 유기 전기 루미네선스 소자 |
| EP2393819B9 (de) * | 2009-01-07 | 2017-12-27 | UDC Ireland Limited | Silyl- und heteroatom-substituierte verbindungen ausgewählt aus carbazolen, dibenzofuranen, dibenzothiophenen und dibenzophospholen und ihre anwendung in der organischen elektronik |
| WO2015114102A1 (en) * | 2014-02-03 | 2015-08-06 | Basf Se | Silyl substituted azadibenzofurans and azadibenzothiophenes |
| KR102715029B1 (ko) * | 2016-08-10 | 2024-10-10 | 삼성전자주식회사 | 실릴계 화합물 및 이를 포함하는 유기 발광 소자 |
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- 2019-03-13 KR KR1020207029140A patent/KR102786862B1/ko active Active
- 2019-03-13 JP JP2020506617A patent/JP7290149B2/ja active Active
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- 2019-03-13 CN CN201980018631.7A patent/CN111836816B/zh active Active
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Cited By (2)
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| US20210104686A1 (en) * | 2019-10-03 | 2021-04-08 | The University Of Toledo | Materials and Methods to Improve the Stability of Metal Halide Perovskites |
| WO2025197665A1 (ja) * | 2024-03-22 | 2025-09-25 | 日産化学株式会社 | 電荷輸送性組成物 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3766887A4 (en) | 2021-12-01 |
| US20210061825A1 (en) | 2021-03-04 |
| TW201943700A (zh) | 2019-11-16 |
| KR102786862B1 (ko) | 2025-03-26 |
| KR20200131858A (ko) | 2020-11-24 |
| EP3766887A1 (en) | 2021-01-20 |
| CN111836816A (zh) | 2020-10-27 |
| JP7290149B2 (ja) | 2023-06-13 |
| TWI799537B (zh) | 2023-04-21 |
| JPWO2019177043A1 (ja) | 2021-04-01 |
| CN111836816B (zh) | 2023-12-19 |
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