WO2005097940A1 - 有機エレクトロルミネッセンス素子材料、有機エレクトロルミネッセンス素子、表示装置及び照明装置 - Google Patents
有機エレクトロルミネッセンス素子材料、有機エレクトロルミネッセンス素子、表示装置及び照明装置 Download PDFInfo
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Definitions
- Organic electroluminescent device organic electroluminescent device
- the present invention relates to a material for an organic electroluminescent device, a device for an organic electroluminescent device, a display device, and a lighting device.
- ELD electroluminescent display
- examples of ELD components include an inorganic electroluminescent device and an organic electroluminescent device (hereinafter, referred to as an organic EL device).
- Inorganic electroluminescent devices have been used as flat light sources, but high voltage AC is required to drive the light emitting devices.
- An organic EL device has a configuration in which a light-emitting layer containing a compound that emits light is sandwiched between a cathode and an anode. Electrons and holes are injected into the light-emitting layer and recombined to generate excitons (excitons).
- an element having an organic light-emitting layer obtained by using an 8-hydroxyquinoline aluminum complex as a host conjugate and adding a small amount of a phosphor thereto for example, JP-A-63-264692
- a device having an organic light emitting layer in which a quinoline aluminum complex is used as a host conjugate and doped with a quinacridone dye for example, JP-A-3-255190
- the upper limit of the internal quantum efficiency is 100%, so that the luminous efficiency is twice as high as that of the excited singlet, and performance almost equivalent to that of a cold cathode tube is not obtained. Because of the possibility that it may be used, it is attracting attention as a lighting application.
- the light emission luminance and the light emission efficiency of the light emitting element are greatly improved as compared with the conventional element because the emitted light is derived from phosphorescence. There is a problem that the light lifetime is shorter than that of the conventional device.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-332291
- Patent Document 2 JP-A-2002-332292
- Patent Document 3 JP-A-2002-338588
- Patent Document 4 JP 2002-226495 A
- Patent Document 5 Japanese Patent Application Laid-Open No. 2002-234894
- Patent Document 6 International Publication No. 02Z15645 pamphlet
- Patent Document 7 Japanese Patent Application Laid-Open No. 2003-123982
- Patent Document 8 Japanese Patent Application Laid-Open No. 2002-117978
- Non-Patent Document 1 Inorganic Chemistry, Vol. 41, No. 12, pp. 3055-3066 (2002)
- Non-Patent Document 2 Ap Physics Letters., Vol. 79, page 2082 (2001)
- Non-Patent Document 3 Applied Physics Letters., Vol. 83, page 3818 (2003)
- Non-Patent Document 4 New Journal of Chemistry. , Vol. 26, p. 1171 (2002)
- the present invention has been made in view of the above problems, and an object of the present invention is to provide an organic EL device material which is a metal complex having a specific ligand and a high luminous efficiency using the device material. And an organic EL element, a lighting device, and a display device having a long emission life.
- a material for an organic EL device comprising a metal complex having a ligand represented by the following general formula (1).
- X, X, X and X each independently represent a carbon atom or a nitrogen atom;
- 1 2 3 4 1 2 represents an elemental atom
- Z1 is with C, X, X
- ⁇ 2 is with C, X, X It represents an atomic group necessary to form a hydrogen ring or an aromatic heterocyclic ring.
- A is a nitrogen atom
- Item 3 The organic electroluminescent device material according to Item 1, wherein 36- ⁇ : 1 R-1 in the general formula (1) is an aromatic hydrocarbon group or an aromatic heterocyclic group.
- C, C, C, C, and C each represent a carbon atom, and ⁇ 3 is aromatic together with C, C, and C.
- C, ⁇ represents an atomic group necessary for forming an aromatic heterocyclic ring.
- ⁇ is a nitrogen atom
- R represents a substituent
- M represents group 8 in the periodic table.
- the bond between C and N represents a single bond or a double bond.
- R in the general formula (2) is an aromatic hydrocarbon group or an aromatic heterocyclic group.
- Item 5 The organic electroluminescent material according to item 3 or 4, wherein the metal complex is a metal complex having the following general formula (3) or a tautomer thereof as a partial structure. -General formula (3)
- A represents a nitrogen atom or a boron atom
- R represents a substituent
- nl and n2 each represent an integer of 0-3.
- M is group 8 in the periodic table
- Organic electroluminescent material for organic electroluminescence for organic electroluminescence.
- Item 18 An organic electroluminescent device comprising the organic electroluminescent device according to any one of Items 117 to 127.
- Item 10 The organic electret according to Item 8, which has at least one light-emitting layer as a constituent layer, and wherein the light-emitting layer contains the organic electroluminescent device material according to any one of Items 117 to 17. Mouth luminescence element.
- the hole-blocking layer contains the organic electroluminescent device material according to Item 1-17.
- Item 10 The organic electroluminescent device according to Item 8 or 9, wherein:
- FIG. 11 A display device comprising the organic electroluminescent device according to any one of Items 8 to 10.
- Item 11 An illuminating device comprising the organic electroluminescent device according to any one of Items 8 to 10.
- an organic EL device material which is a metal complex having a specific ligand and an organic EL device having high luminous efficiency and a long luminescent life, a lighting device, A display device could be provided.
- FIG. 1 is a schematic view showing an example of a display device configured with an organic EL element.
- FIG. 2 is a schematic diagram of a display unit A.
- FIG. 3 is an equivalent circuit diagram of a driving circuit constituting a pixel.
- FIG. 4 is a schematic diagram of a display device using a passive matrix method.
- FIG. 5 is a schematic diagram of a sealing structure of an organic EL element OLED1-1.
- FIG. 6 (a) is a schematic plan view of a lighting device including an organic EL element.
- FIG. 6 (b) is a schematic sectional view of a lighting device including an organic EL element.
- an organic EL device material which is a metal complex having a specific ligand is obtained by adopting the constitution defined in any one of claims 17 to 17. I was able to do it.
- an organic EL device material By using the organic EL device material, an organic EL device having high luminous efficiency and a long luminescent life can be obtained.
- the display device according to claim 11 and the lighting device according to claim 12 which exhibit high luminance and high durability, respectively.
- the present inventors have conducted intensive studies in view of the above problems, and as a result, have found that a metal complex having a ligand represented by the general formula (1) and a metal complex having a ligand represented by the general formula (2) Metal complex with structure
- a metal complex having a specific ligand such as a complex or a metal complex having a partial structure represented by the general formula (3)
- the effects described in the present invention can be achieved immediately. In other words, it was found that an organic EL device exhibiting high luminous efficiency and having a long luminous life was obtained.
- the "metal complex having a specific ligand" used in the present invention means that when a metal complex is formed from a ligand and a central metal, the central metal of the metal complex and the ligand Of the ligand molecules located on the side opposite to the side where the complex is formed (that is, the side opposite to the side where a coordination bond is formed between the ligand and the central metal). Have a molecular structure linked by one nitrogen atom or one boron atom.
- an organic EL device manufactured using a conventional organic EL device material containing a metal complex can be used. It was found that the short emission lifetime, which was a problem of the device, was greatly improved.
- a layer containing the metal complex in the device a light emitting layer and Z or a hole blocking layer are preferable, and when the metal complex is contained in the light emitting layer, it is used as a light emitting dopant in the light emitting layer.
- the effect described in the present invention that is, a longer luminescent lifetime of the organic EL element, was achieved.
- the metal complex having a ligand represented by the general formula (1) according to the present invention will be described.
- Z forms together with C, X, and X
- Z forms together with C, X, and X, respectively.
- aromatic hydrocarbon ring examples include a benzene ring, a biphenyl ring, a naphthalene ring, an azulene ring, an anthracene ring, a phenanthrene ring, a pyrene ring, a thalicene ring, a naphthacene ring, a triphenylene ring, and o-tenolene phenol.
- Ring m-tenorpheninole ring, p-tenolefeninole ring, acenaphthene ring, coronene ring, fluorene ring, fluoranthrene ring, naphthacene ring, pentacene ring, perylene ring, pentaphene ring, picene ring, pyrene ring, pyrantrene And an anthra anthrene ring.
- a benzene ring is preferably used.
- the aromatic hydrocarbon ring is represented by the following general formula (1):
- Z forms together with C, X, and X
- Z forms together with C, X, and X, respectively.
- aromatic heterocyclic ring examples include, for example, a furan ring, a thiophene ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, a benzimidazole ring, an oxadiazole ring, a triazole ring, an imidazole ring, a pyrazole ring, a thiazole ring, and an indole.
- a pyridine ring is preferable.
- the aromatic heterocyclic ring may have a substituent represented by R in the above-mentioned general formula (1) described later.
- examples of the substituent represented by R include an alkyl group (for example,
- At least one of the groups represented by R is an aromatic carbon
- It is preferably a hydride group or an aromatic heterocyclic group.
- a coordination bond is formed between the ligand represented by the general formula (1) and the central metal (which may be a metal or an ion) (also complex formation!) To form a metal complex. You.
- the formation of the coordination bond between the ligand and the central metal is caused by the formation of the ligand constituting the ligand represented by the general formula (1).
- the ligand constituting the ligand represented by the general formula (1) In, between X and between
- a coordination bond or a covalent bond is formed.
- Z has the same meaning as an aromatic hydrocarbon ring formed together with C, X, and X.
- Z has the same meaning as C, X, and an aromatic heterocyclic ring formed together with X.
- the aromatic heterocyclic ring formed by Z together with C, C, and N is a pyridine ring
- it may be a metal or an ion.
- the metal complex having the general formula (3) or a tautomer thereof as a partial structure according to the present invention will be described.
- it may be a metal or an ion.
- organic EL device material of the present invention it is preferable to use the organic EL device as a light emitting layer or a hole blocking layer among constituent layers of the organic EL device (details will be described later).
- the light emitting layer as described above, it is preferably used as a light emitting dopant.
- the mixing ratio of the light-emitting dopant to the light-emitting host, which is the main component in the light-emitting layer, is preferably adjusted to a range of 0.1% by mass to less than 30% by mass.
- the light-emitting dopant may be a mixture of a plurality of types of compounds, and the mixing partner may have a different structure.
- Other metal complexes or phosphorescent dopants or fluorescent dopants having other structures may be used.
- dopants phosphorescent dopants, fluorescent dopants, and the like
- metal complex used as the luminescent dopant
- the light-emitting dopant is roughly classified into two types, a fluorescent dopant that emits fluorescence and a phosphorescent dopant that emits phosphorescence.
- fluorescent dopant include coumarin dyes, pyran dyes, cyanine dyes, croconium dyes, squarium dyes, oxobenzanthracene dyes, fluorescein dyes, and rhodamines Dyes, pyrylium dyes, perylene dyes, styrven dyes, polythione dyes, and rare earth complex fluorescent materials.
- a typical example of the latter is preferably a complex compound containing a metal belonging to Groups 8, 9, or 10 of the periodic table of the elements, and more preferably an iridium compound or an iridium compound. Sumidium compounds are the most preferred, and iridium compounds are the most preferred.
- JP 2002-280178 JP 2001-181616, JP 2002-280179, JP 2001-181617, JP 2002-280180, JP 2001-247859 JP, JP 2002-299060 JP, JP 2001-313178 JP, JP 2002-302671 JP, JP 2001-345183 JP, JP 2002-324679 JP, WO 02/15645 pamphlet, JP-A-2002-332291, JP-A-2002-50484, JP-A-2002-332292 JP, JP-A-2002-83684, JP-T-2002-540572, JP-A-2002-117978, JP-A-2002-338588, JP-A-2002-170684, JP-A-2002-352960 WO 01Z93642 pamphlet, JP-A-2002-50483, JP-A-2002-100, JP-A-2002-173674, JP-A-2002-359
- a light-emitting host (also referred to simply as a host!) Means a compound having the highest mixing ratio (mass) in a light-emitting layer composed of two or more compounds, and the other compounds are referred to as “do”.
- One panto compound also simply referred to as a dopant
- the light emitting layer is composed of three types of compound A, compound B, and compound C, and if the mixing ratio is 8: 5: 5: 10: 85, compound A, Compound B is a dopant compound, and compound C is a hostile conjugate.
- the luminescent host used in the present invention a compound having a shorter wavelength than the phosphorescent 0-0 band of the luminescent dopant used in combination is preferable, and the luminescent dopant is preferably the phosphorescent 0-0 band.
- the emission host preferably has a phosphorescent 0-0 band power of 50 nm or less.
- the luminescent host of the present invention is not particularly limited in structure, but is typically a carbazole derivative, a triarylamine derivative, an aromatic borane derivative, a nitrogen-containing heterocyclic compound, a thiophene derivative, A compound having a basic skeleton such as a furan derivative or an oligoarylene compound and having the 0-0 band of 450 nm or less is a preferable compound.
- the luminescent host of the present invention may be a low-molecular compound, a high-molecular compound having a repeating unit, or a low-molecular compound having a polymerizable group such as a vinyl group or an epoxy group (a vapor-deposited polymerizable luminescent host). Good.
- the luminescent host a compound which has a hole transporting ability and an electron transporting ability, prevents a longer wavelength of light emission, and has a high Tg (glass transition temperature) is preferable.
- the blocking layer for example, an electron blocking layer and a hole blocking layer
- the organic EL device material of the present invention for the hole blocking layer, the electron blocking layer, and the like, and it is particularly preferable to use the organic EL device material for the hole blocking layer.
- the metal complex according to the present invention may be contained in a state of 100% by mass as a layer component of a hole blocking layer, an electron blocking layer, or the like, as described in any one of Items 1 to 17 above. However, it may be mixed with other organic compounds (for example, compounds used for the constituent layers of the organic EL device of the present invention) and the like.
- the thickness of the blocking layer according to the present invention is preferably from 3 nm to 100 nm, more preferably from 5 nm to 30 nm.
- the hole blocking layer has the function of an electron transporting layer in a broad sense, and has the ability to transport electrons and has a very small ability to transport holes, and thus blocks holes while transporting electrons. By doing so, the recombination probability of electrons and holes can be improved.
- hole blocking layer for example, JP-A Nos. 11-204258 and 11-204359, and “Organic EL Devices and Their Forefront of Industrialization” (November 30, 1998, published by N.T.S. )) On page 237 etc. can be applied as the hole blocking layer according to the present invention.
- the configuration of the electron transport layer described later may be changed according to necessity. It can be used as a hole blocking layer according to the present invention.
- Electron blocking layer >>
- an electron blocking layer has the function of a hole transporting layer in a broad sense, and has the ability to transport holes and has a very small ability to transport electrons. By blocking the electrons, the recombination probability of electrons and holes can be improved. Further, the configuration of the hole transport layer described later can be used as an electron blocking layer as needed.
- the above-mentioned organic EL device material of the present invention for the adjacent layer adjacent to the light emitting layer, ie, the hole blocking layer and the electron blocking layer, particularly It is preferably used for a blocking layer.
- the hole transport layer includes a material having a function of transporting holes.
- a hole injection layer and an electron blocking layer are also included in the hole transport layer.
- the hole transport layer may be provided as a single layer or a plurality of layers.
- the hole transport material is not particularly limited, and is conventionally used as a hole charge injection / transport material in photoconductive materials, and is used for a hole injection layer and a hole transport layer of an EL element. Any one of known ones used can be selected and used.
- the hole transporting material has any of hole injection or transport and electron barrier properties, and may be any of an organic substance and an inorganic substance.
- triazole derivatives oxazidazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, furylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styryl anthracene derivatives, fluorenone derivatives, hydrazone derivatives , Stilbene derivatives, silazane derivatives, aniline-based copolymers, and conductive polymer oligomers, particularly thiophene oligomers.
- the hole transporting material the above-mentioned materials can be used. It is preferable to use a porphyrin compound, an aromatic tertiary amine compound and a styrylamine compound, particularly an aromatic tertiary amine compound. ,.
- aromatic tertiary amyloid and the styryl amyloid include N, N, N
- N, -tetraphenyl-4,4,1-diaminophenol N, N, z-phenyl, N, N, bis (3 Methylphenyl)-[1,1, -biphenyl] 4,4, diamine (TPD); 2,2 bis (4-zy P-tolylaminophen) propane; 1,1, bis (4-zy p-tolylaminophen) N, N, ⁇ ', ⁇ , -tetra- ⁇ -tolyl 4,4, diaminobiphenyl; 1,1 bis (4-di ⁇ -tolylaminophenyl) 4-phenylcyclohexane; Bis (4-dimethylamino-2-methylphenyl) phenylmethane; bis (4-di ⁇ -tolylaminophenyl) phenylmethane; ⁇ , ⁇ , diphenyl- ⁇ , ⁇ , di (4-methoxyphenyl) 4, 4 —, ⁇ , ⁇ ', ⁇ ,
- a polymer material in which these materials are introduced into a polymer chain, or in which these materials are used as a polymer main chain, can also be used.
- inorganic compounds such as p-type Si and p-type SiC can also be used as hole injection materials and hole transport materials.
- the hole transport material preferably has a high Tg.
- the hole transporting layer is formed by thinning the hole transporting material by a known method such as a vacuum evaporation method, a spin coating method, a casting method, an inkjet method, and an LB method. be able to.
- the thickness of the hole transport layer is not particularly limited, but is usually 5 nm—50 nm.
- the hole transport layer may have a single-layer structure composed of one or more of the above materials.
- the electron transport layer is a material having a function of transporting electrons.
- an electron injection layer and a hole blocking layer are also included in the electron transport layer.
- the electron transport layer may be a single layer or multiple layers. Can be opened.
- the electron transporting material also serving as a hole blocking material used for the electron transporting layer having a single layer and the electron transporting layer adjacent to the light emitting layer on the cathode side with respect to the light emitting layer includes the following.
- the above materials are known.
- the electron transporting layer may be any material selected from conventionally known compounds as long as it has a function of transmitting electrons injected from the cathode to the light emitting layer. You can be there.
- Examples of the material used for the electron transporting layer include: -a substituted fluorene derivative, a difluoroquinone derivative, a thiopyrandioxide derivative, and a heterocyclic ring such as naphthaleneperylene.
- Examples include tetracarboxylic anhydride, carbodiimide, fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, and oxaziazole derivatives.
- a thiadiazole derivative in which the oxygen atom of the oxaziazole ring is substituted with a sulfur atom, and a quinoxaline derivative having a quinoxaline ring which is known as an electron-withdrawing group, can also be used as the electron transporting material.
- a polymer material in which these materials are introduced into a polymer chain, or in which these materials are used as a polymer main chain, can also be used.
- metal complexes of 8-quinolinol derivatives for example, tris (8-quinolinol) aluminum- (Alq), tris (5,7-dicrochloride-8-quinolinol) aluminum, tris (5,7-dibumodium) — 8- (quinolinol) aluminum, tris (2-methyl-8-quinolinol) aluminum, tris (5-methyl-8-quinolinol) aluminum, bis (8-quinolinol) zinc (Znq), etc.
- Metal complexes replaced by Mg, Cu, Ca, Sn, Ga or Pb can also be used as electron transport materials.
- metal-free or metal phthalocyanine or those whose terminals are substituted with an alkyl group ⁇ sulfonic acid group or the like can be preferably used as the electron transporting material.
- the distyryl virazine derivative exemplified as a material for the light emitting layer can be used as an electron transporting material, and like the hole injection layer and the hole transporting layer, n-type Si, n-type SiC, etc.
- Inorganic semiconductors can also be used as electron transport materials.
- the electron transporting layer can be formed by thinning the electron transporting material by a known method such as a vacuum evaporation method, a spin coating method, a casting method, an inkjet method, and an LB method. it can.
- the thickness of the electron transport layer is not particularly limited, but is usually about 5 to 5000 nm.
- the electron transport layer may have a single-layer structure made of one or more of the above materials.
- Injection layer >>: electron injection layer, hole injection layer
- the injection layer is provided as needed, and has an electron injection layer and a hole injection layer. As described above, the injection layer exists between the anode and the light emitting layer or the hole transport layer, and between the cathode and the light emitting layer or the electron transport layer. May be present.
- the injection layer is a layer provided between the electrode and the organic layer for lowering the driving voltage and improving the light emission luminance, and is referred to as "the organic EL device and its industrial frontier (November 30, 1998, The details are described in Chapter 2, Chapter 2, “Electrode Materials” (pages 123-166) of Vol. 2, No. 2, pp. 123-166, and the hole injection layer (anode buffer layer) and the electron injection layer (cathode buffer). One).
- the anode buffer layer (hole injection layer) is described in detail in JP-A-9-45479, JP-A-9-260062, JP-A-8-288069 and the like.
- Copper phthalate One layer of phthalocyanine buffer typified by cyanine, one layer of oxide buffer typified by vanadium oxide, one layer of amorphous carbon buffer, polymer buffer using conductive polymer such as polyaline (emeraldine) or polythiophene And one layer.
- the thickness of the buffer layer is preferably in the range of 0.1 nm to 100 nm, although it depends on the desired material.
- This injection layer can be formed by applying a thin film to the above-mentioned material by a known method such as a vacuum evaporation method, a spin coating method, a casting method, an ink jet method, and an LB method.
- the thickness of the injection layer is not particularly limited, but is usually about 5 to 5000 nm.
- the injection layer may have a single-layer structure in which one or more of the above-mentioned materials are used.
- anode for the organic EL device of the present invention a material having a large work function (4 eV or more), such as a metal, an alloy, an electrically conductive compound, and a mixture thereof is preferably used.
- a metal, an alloy, an electrically conductive compound, and a mixture thereof is preferably used.
- an electrode substance include metals such as Au, and conductive transparent materials such as Cul, indium tin oxide (ITO), SnO, and ZnO.
- ITO indium tin oxide
- SnO Tin Oxide
- ZnO ZnO
- IDIXO In O-
- a material capable of forming an amorphous transparent conductive film such as ZnO may be used.
- the anode is used to form a thin film by depositing these electrode materials by vapor deposition or sputtering, etc., and to form a pattern of a desired shape by one photolithography method. m or more), a pattern may be formed through a mask having a desired shape at the time of vapor deposition or sputtering of the electrode material.
- the transmittance be greater than 10%
- the sheet resistance of the anode is preferably several hundred ⁇ / square or less.
- the film thickness is selected in the range of usually 10 to 1000 nm, preferably 10 to 200 nm, depending on the material.
- a metal having a low work function (4 eV or less) (referred to as an electron injecting metal), an alloy, an electrically conductive compound, and a mixture thereof are used as an electrode material.
- an electrode material include sodium, sodium monolithium alloy, magnesium, lithium, a mixture of magnesium and copper, a mixture of magnesium and silver, a mixture of magnesium and aluminum, a mixture of indium magnesium and a mixture of aluminum and aluminum, and a mixture of aluminum and zinc oxide. (Al 2 O 3) mixture, indium, lithium
- Examples include a 23Z aluminum mixture, a rare earth metal, and the like.
- a mixture of an electron-injection metal and a second metal which is a stable metal having a large work function, such as a magnesium Z-silver mixture, Magnesium Z aluminum mixture, Magnesium Z indium mixture, Aluminum Z oxidized aluminum (Al O) mixture , Lithium z-aluminum mixtures, aluminum and the like are preferred.
- the cathode can be manufactured by forming a thin film of these electrode materials by a method such as evaporation or sputtering.
- the sheet resistance as the cathode is preferably several hundreds ⁇ / square or less, and the preferred film thickness is usually selected in the range of lOnm-1000 nm, preferably 50 nm-200 nm.
- the preferred film thickness is usually selected in the range of lOnm-1000 nm, preferably 50 nm-200 nm.
- the substrate for the organic EL device of the present invention is not particularly limited in the type of glass, plastic, etc., and is not particularly limited as long as it is transparent. And a light-transmitting resin film.
- Particularly preferred V is a resin film that can provide flexibility to the organic EL device.
- Examples of the resin film include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyether sulfone (PES), polyether imide, polyether ether ketone, polyphenylene sulfide, polyarylate, polyimide, and polycarbonate (PC). And cellulose triacetate (TAC) and cellulose acetate propionate (CAP).
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PES polyether sulfone
- PES polyether imide
- polyether ether ketone polyphenylene sulfide
- PC polycarbonate
- TAC cellulose triacetate
- CAP cellulose acetate propionate
- the resin film is a high-nore film having a water vapor permeability of 0.01 gZm 2 'dayatm or less, regardless of whether an inorganic or organic coating or a hybrid coating of both is formed on the surface of the resin film. .
- the organic light-emitting device of the present invention has an emission efficiency at room temperature of preferably 1% or more, more preferably 2% or more.
- the quantum efficiency (%) extracted from the outside is the number of photons emitted to the outside of the organic EL element Z The number of electrons flowing to the organic EL element X 100.
- a hue improvement filter such as a color filter may be used in combination.
- a film having a roughened surface (such as an anti-glare film) may be used in combination to reduce uneven light emission.
- a method for producing an organic EL device of the present invention a method for producing an organic EL device comprising an anode / hole injection layer / hole transport layer Z light-emitting layer Z hole blocking layer Z electron transport layer Z cathode buffer layer Z cathode Will be described.
- a desired electrode material for example, a thin film as a material for an anode is formed on an appropriate substrate by a method such as evaporation or sputtering so as to have a thickness of 1 ⁇ m or less, preferably 10 nm to 200 nm.
- a thin film containing an organic compound such as a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, and an electron transport layer, which are element materials, is formed thereon.
- Examples of the method for forming a thin film containing an organic compound include a spin coating method, a casting method, an ink jet method, a vapor deposition method, and a printing method, as described above.
- the vacuum evaporation method or the spin coating method is particularly preferable in that pinholes are hardly generated. Further, a different film forming method may be applied to each layer. If you use the film adopts the deposition, the deposition conditions vary due to kinds of materials used, generally baud preparative heating temperature 50 ° C- 450 ° C, vacuum degree of 10- 6 Pa- 10- 2 It is desirable to select appropriate values within the range of Pa, deposition rate of 0. Olnm—50 nm / sec, substrate temperature of -50 ° C to 300 ° C, and film thickness of 0.1 nm to 5 m.
- a thin film also having a cathode material force is formed thereon by a method such as vapor deposition or sputtering so as to have a thickness of 1 ⁇ m or less, preferably 5 Onm-200 nm.
- a desired organic EL device can be obtained by forming and providing a cathode. In the production of this organic EL device, it is preferable to produce from the hole injection layer to the cathode consistently by one evacuation, but it is not tough to take it out and apply a different film forming method. At that time, consideration must be given to performing the work in a dry inert gas atmosphere.
- the display device of the present invention will be described.
- the display device of the present invention may be monochromatic or multicolored.
- a multicolored display device will be described.
- a shadow mask is provided only when the light-emitting layer is formed, and a film can be formed on one surface by an evaporation method, a casting method, a spin coating method, an inkjet method, a printing method, or the like.
- the method is not particularly limited, but is preferably an evaporation method, an inkjet method, or a printing method. In the case of using a vapor deposition method, a pattern Jung using a shadow mask is preferable.
- the multicolor display device can be used as a display device, a display, and various light emission light sources.
- full-color display can be achieved by using three types of organic EL elements that emit blue, red, and green light.
- Examples of the display device and display include a television, a computer, a monophonic device, an AV device, a character broadcast display, and an information display in a car.
- the driving method may be either a simple matrix (passive matrix) method or an active matrix method.
- Light-emitting sources include home lighting, car interior lighting, backlights for watches and LCDs, billboard advertisements, traffic lights, light sources for optical storage media, light sources for electrophotographic copiers, light sources for optical communication processors, and light sensors.
- a light source or the like may be mentioned, but the light source is not limited to this.
- the lighting device of the present invention will be described.
- the organic EL device of the present invention may be used as an organic EL device having a resonator structure.
- the organic EL device having such a resonator structure may be used as a light source for an optical storage medium, an electronic device, or the like.
- Light source of a photocopier, light source of an optical communication processor, light source of an optical sensor, etc. 1S is not limited to these.
- the organic EL element of the present invention may be used as a kind of lamp such as an illumination light source or an exposure light source, a projection device of an image projection type, or a still image or a moving image. You may use it as a display device (display) of the type which can be visually recognized directly.
- the driving method may be either a simple matrix (passive matrix) method or an active matrix method.
- a full-color display device can be manufactured by using two or more kinds of the organic EL elements of the present invention having different emission colors.
- FIG. 1 is a schematic diagram showing an example of a display device configured with an organic EL element.
- FIG. 2 is a schematic view of a display such as a mobile phone for displaying image information by light emission of an organic EL element.
- the display 1 also includes a display unit A having a plurality of pixels and a control unit B that performs image scanning of the display unit A based on image information.
- the control unit B is electrically connected to the display unit A, sends a scan signal and an image data signal to each of a plurality of pixels based on image information from the outside, and controls the pixels for each scan line by the scan signal. , Sequentially emit light according to the image data signal, perform image scanning, and display image information on the display unit A.
- FIG. 2 is a schematic diagram of the display unit A.
- the display section A has a wiring section including a plurality of scanning lines 5 and data lines 6 and a plurality of pixels 3 and the like on a substrate.
- the main members of the display unit A will be described below.
- the figure shows a case where the light power emitted by the pixel 3 is extracted in the direction of the white arrow (downward).
- the scanning lines 5 and the plurality of data lines 6 of the wiring portion are each made of a conductive material, and the scanning lines 5 and the data lines 6 are orthogonal to each other in a grid pattern and are connected to the pixels 3 at orthogonal positions ( Details are not shown).
- the pixel 3 When a scanning signal is applied from the scanning line 5, the pixel 3 outputs an image data signal from the data line 6. Receiving and emitting light according to the received image data. By properly arranging pixels in the red, green, and blue light emission regions on the same substrate, full color display is possible.
- FIG. 3 is a schematic diagram of a pixel.
- the pixel includes an organic EL element 10, a switching transistor 11, a driving transistor 12, a capacitor 13, and the like.
- a full-color display can be performed by using red, green, and blue light emitting organic EL elements as the organic EL elements 10 for a plurality of pixels and juxtaposing them on the same substrate.
- an image data signal is applied to the drain of the switching transistor 11 via the data line 6 in the control unit B.
- a scanning signal is applied to the gate of the switching transistor 11 via the control unit B scanning line 5
- the driving of the switching transistor 11 is turned on, and the image data signal applied to the drain is transferred to the capacitor 13 and the driving transistor. It is transmitted to the gate of star 12.
- the capacitor 13 is charged according to the potential of the image data signal, and the driving of the drive transistor 12 is turned on.
- the drive transistor 12 has a drain connected to the power supply line 7, a source connected to the electrode of the organic EL element 10, and an organic EL element connected from the power supply line 7 according to the potential of the image data signal applied to the gate. Element 10 is supplied with current.
- the driving of the switching transistor 11 is turned off. However, even if the driving of the switching transistor 11 is turned off, the capacitor 13 holds the potential of the charged image data signal, so that the driving of the driving transistor 12 is kept on and the next scanning signal is applied.
- the organic EL element 10 continues to emit light until the light is emitted.
- the driving transistor 12 is driven according to the potential of the next image data signal synchronized with the scanning signal, and the organic EL element 10 emits light.
- light emission of the organic EL element 10 is provided by providing a switching transistor 11 and a driving transistor 12 as active elements for the organic EL element 10 of each of a plurality of pixels.
- the organic EL element 10 of each of the plurality of pixels 3 emits light.
- Such a light emitting method is called an active matrix method.
- the light emission of the organic EL element 10 may be a light emission of a plurality of gradations by a multi-valued image data signal having a plurality of gradation potentials, or a predetermined light emission amount by a binary image data signal. No, it's a talent! /.
- the potential of the capacitor 13 may be maintained until the next scan signal is applied, or may be discharged immediately before the next scan signal is applied.
- the present invention is not limited to the active matrix method described above, but may be a passive matrix light emission drive in which an organic EL element emits light in accordance with a data signal only when a scanning signal is scanned.
- FIG. 4 is a schematic diagram of a display device using a noisy matrix system.
- a plurality of scanning lines 5 and a plurality of image data lines 6 are provided in a grid pattern facing each other with the pixel 3 interposed therebetween.
- the pixels 3 connected to the applied scanning line 5 emit light according to the image data signal.
- the organic EL device material of the present invention can also be applied to an organic EL device that emits substantially white light as a lighting device.
- a plurality of light-emitting materials emit light of a plurality of colors at the same time, and white light is obtained by mixing colors.
- a combination of a plurality of emission colors a combination containing three emission maximum wavelengths of the three primary colors of blue, green, and blue may be used, or a combination of complementary colors such as blue and yellow, or blue-green and orange may be used.
- One containing two emission maximum wavelengths is acceptable.
- the combination of light-emitting materials for obtaining a plurality of light-emitting colors is a combination of a plurality of materials that emit light by phosphorescence or fluorescence, a light-emitting material that emits light by fluorescence or phosphorescence, and a light-emitting material. Any combination of a dye material that emits the above-mentioned light as excitation light may be used. However, in the white organic electroluminescent device according to the present invention, it is only necessary to mix and combine a plurality of light-emitting dopants. A mask is provided only when a light emitting layer, a hole transport layer, an electron transport layer, or the like is formed, and the mask is separately applied by using a mask.
- an electrode film can be formed on one surface by vapor deposition, casting, spin coating, ink jet, printing, etc. , Productivity also improves. According to this method, the element itself emits white light, unlike a white organic EL device in which light-emitting elements of a plurality of colors are arranged in parallel in an array.
- the light emitting material used for the light emitting layer is not particularly limited.
- the platinum complex according to the present invention is adjusted so as to conform to a wavelength range corresponding to CF (color filter) characteristics. Also, it is only necessary to select and combine arbitrary materials from known light emitting materials to whiten them.
- the white light-emitting organic EL device of the present invention can be used as a kind of lamp such as a home light, a vehicle light, or an exposure light as various light-emitting light sources and lighting devices. Also, it is usefully used for display devices such as backlights of liquid crystal display devices.
- a backlight such as a clock, a signboard advertisement, a traffic light, a light source such as an optical storage medium, a light source of an electronic photocopier, a light source of an optical communication processor, a light source of an optical sensor, and a display device are required.
- a wide range of applications such as general household electric appliances.
- the luminescent host material the luminescent dopant, and the materials used for forming the hole blocking layer and the like used in any one of Examples 1 to 6 are shown.
- the transparent support substrate provided with the ITO transparent electrodes was ultrasonically irradiated with iso-propyl alcohol. After washing, drying with dry nitrogen gas, UV ozone washing was performed for 5 minutes.
- the transparent support substrate was fixed to a substrate holder of a commercially available vacuum vapor deposition apparatus, while five tantalum-made resistance boats were coated with ⁇ -NPD, CBP, Ir-10, BCP, and Alq, respectively. Entering
- lithium fluoride was placed in a tantalum resistance heating boat, and aluminum was placed in a tungsten resistance heating boat, and they were attached to a second vacuum tank of a vacuum evaporation apparatus.
- the heating boat containing the BCP was energized and heated to provide a hole blocking layer having a thickness of lOnm at a deposition rate of 0.2 InmZ seconds to 0.2 nmZ seconds. Further, the heating containing Alq
- the boat was energized and heated, and a 40 nm-thick electron transport layer was provided at a deposition rate of 0.2 InmZ seconds to 0.2 nmZ seconds.
- a cathode buffer steam Chakusokudo 0. OlnmZ seconds thickness 0. 5 nm in one 0. 02NmZ seconds by supplying an electric current to the boat lithium fluoride-containing One layer was provided, and then a boat containing aluminum was energized to apply a 150 nm-thick cathode at a deposition rate of 1 nmZ second to 12 nmZ second.
- the organic EL element was transferred to a glove box (a glove box replaced with a high-purity nitrogen gas having a purity of 99.999% or more) in a nitrogen atmosphere without being brought into contact with the atmosphere.
- OL ED1-1 was produced with the sealing structure replaced with.
- barium oxide 105 as a water trapping agent is obtained by sealing a high-purity barium oxide powder manufactured by Aldrich Co. with a fluororesin semi-permeable membrane (Microtex SN TF8031Q manufactured by Nitto Denko) with an adhesive. What was pasted on was prepared and used in advance. The sealing can was bonded to the organic EL element using an ultraviolet-curing adhesive 107, and the two were bonded by irradiating an ultraviolet lamp to produce a sealing element.
- a fluororesin semi-permeable membrane Microtex SN TF8031Q manufactured by Nitto Denko
- reference numeral 101 denotes a glass substrate provided with a transparent electrode
- 102 denotes an organic EL layer composed of a hole injection Z transport layer, a light emitting layer, a hole blocking layer, an electron transport layer and the like
- 103 denotes a cathode.
- Organic EL elements OLED1-2-1-17 were produced in the same manner as above, except that the emission dopant was changed as described in Table 1 in the production of OLED1-1.
- the external extraction quantum efficiency was expressed as a relative value when the organic EL element OLED1-1 was set to 100.
- each element of the organic EL element OLED1-1- 1-18 performs continuous lighting by constant current conditions 2.5mAZcm 2, the time required to becomes half of the initial luminance (tau
- the light emission lifetime was expressed as a relative value when the organic EL element OLED1-1 was set to 100.
- OLED1-18 1-68 129 220 The present invention [0202] From Table 1, it can be seen that the organic EL device manufactured using the metal complex according to the present invention as the organic EL device material achieved higher luminous efficiency and longer luminescent life than the comparative device. Is evident. The emission colors of the devices of the present invention were all blue.
- An organic EL device OLED2-1-2-17 was produced in the same manner as in Example 1 except that the luminescent dopant was changed as shown in Table 2.
- OLED2-1 In the preparation of OLED2-1, the organic light-emitting host was changed from CBP to AZ1, and the light-emitting dopant used was the metal complex of the present invention (indicated by the compound No. in the table).
- EL device OLED2-18 was fabricated.
- An organic EL device OLED3-1-3-9 was prepared in the same manner as in Example 1 except that the luminescent dopant was changed as shown in Table 3.
- OLED3-1 was prepared in the same manner as OLED3-1 except that the light emitting host was changed from CBP to AZ1 and the light emitting dopant was the metal complex of the present invention (indicated by compound No. in the table).
- EL device OLED3-10 was fabricated.
- An organic EL element OLED4-1 was produced in exactly the same manner as the organic EL element OLED2-1 of Example 2. Next, in the production of the organic EL element OLED4-1, the organic EL element OLED4-2-3-13 was produced in the same manner except that the hole blocking material was changed as shown in Table 4. did.
- Table 4 shows that the device of the present invention has higher luminous efficiency and luminous life than the comparative device.
- the emission colors of the organic EL devices of the present invention were all green.
- the organic EL element OLED 1-5 of Example 1 was used as a blue light emitting element.
- the organic EL element OLED2-7 of Example 2 was used as a green light emitting element.
- the organic EL element OLED3-6 of Example 3 was used as a red light emitting element.
- FIG. 1 An active matrix type full-color display device having the form as shown in FIG. 1 was manufactured, and FIG. 2 shows only a schematic diagram of a display portion A of the manufactured display device.
- a wiring portion including a plurality of scanning lines 5 and data lines 6 and a plurality of juxtaposed pixels 3 (pixels in a red region, pixels in a green region, pixels in a blue region, etc.)
- the scanning lines 5 and the plurality of data lines 6 of the wiring portion are each made of a conductive material, and the scanning lines 5 and the data lines 6 are orthogonal to each other in a grid and are connected to the pixels 3 at orthogonal positions. (Details not shown).
- the plurality of pixels 3 are driven by an active matrix method provided with an organic EL element corresponding to each emission color, a switching transistor as an active element, and a driving transistor, and a scanning signal is applied from a scanning line 5. Then, an image data signal is received from the data line 6 and light is emitted according to the received image data.
- a full-color display device was manufactured by juxtaposing the red, green, and blue pixels as appropriate.
- the electrode of the transparent electrode substrate of Example 1 was patterned into 20 mm ⁇ 20 mm, and ⁇ -NPD was formed thereon as a hole injection / transport layer with a thickness of 25 nm as in Example 1, and further,
- the heating boat containing CBP, the boat containing I4, and the boat containing Ir9 are independently energized to deposit CBP as a light-emitting host and 1-4 and Ir-9 as light-emitting dopants, respectively.
- BCP was formed by lOnm to form a hole blocking layer.
- Alq was deposited at 40nm.
- An electron transport layer was provided.
- Example 2 a square perforated mask having substantially the same shape as the transparent electrode made of stainless steel was placed on the electron injection layer, and 0.5 nm of lithium fluoride and a cathode were formed as a cathode buffer layer.
- a cathode buffer layer was formed by vapor deposition of aluminum with a thickness of 150 nm.
- FIG. 6 shows a schematic diagram of a flat lamp.
- Fig. 6 (a) shows a schematic plan view, and
- Fig. 6 (b) Shows a schematic sectional view.
- an organic electroluminescent device material which is a metal complex having a specific ligand and an organic EL exhibiting high luminous efficiency and having a long luminous life, using the device material
- An element, a lighting device, and a display device can be provided.
- the electroluminescent device material comprises a metal complex having a ligand represented by the following general formula (1).
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Description
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/598,971 US7790890B2 (en) | 2004-03-31 | 2004-03-31 | Organic electroluminescence element material, organic electroluminescence element, display device and illumination device |
| EP05720929A EP1731584A1 (en) | 2004-03-31 | 2005-03-16 | Organic electroluminescent device material, organic electroluminescent device, display and illuminating device |
| JP2006511951A JPWO2005097940A1 (ja) | 2004-03-31 | 2005-03-16 | 有機エレクトロルミネッセンス素子材料、有機エレクトロルミネッセンス素子、表示装置及び照明装置 |
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| JP2004103247 | 2004-03-31 | ||
| JP2004-103247 | 2004-03-31 |
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|---|---|
| US (1) | US7790890B2 (ja) |
| EP (1) | EP1731584A1 (ja) |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| US7232618B2 (en) * | 2002-04-12 | 2007-06-19 | Canon Kabushiki Kaisha | Organic light-emitting device |
| US8133597B2 (en) * | 2005-09-06 | 2012-03-13 | Konica Minolta Holdings, Inc. | Organic electroluminescent device, display and illuminating device |
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| JP2009533850A (ja) * | 2006-04-13 | 2009-09-17 | メルク パテント ゲーエムベーハー | Oled用途のためのビフェニル−金属錯体−モノマー及びオリゴマー三重項エミッター |
| JP2009032989A (ja) * | 2007-07-27 | 2009-02-12 | Fujifilm Corp | 有機電界発光素子 |
| KR20120023810A (ko) * | 2009-05-20 | 2012-03-13 | 유니버셜 디스플레이 코포레이션 | 유기 발광 소자에 사용하기 위한 붕소-질소 복소환 함유 배위자와의 금속 착체 |
| JP2012527472A (ja) * | 2009-05-20 | 2012-11-08 | ユニバーサル ディスプレイ コーポレイション | ホウ素−窒素ヘテロ環を含む配位子をもつ金属錯体 |
| KR101714098B1 (ko) | 2009-05-20 | 2017-03-08 | 유니버셜 디스플레이 코포레이션 | 유기 발광 소자에 사용하기 위한 붕소-질소 복소환 함유 배위자와의 금속 착체 |
| WO2012005172A1 (ja) * | 2010-07-09 | 2012-01-12 | 富士フイルム株式会社 | 有機電界発光素子 |
| JP2012019171A (ja) * | 2010-07-09 | 2012-01-26 | Fujifilm Corp | 有機電界発光素子 |
| WO2015053463A1 (ko) * | 2013-10-08 | 2015-04-16 | 삼성에스디아이 주식회사 | 화합물, 이를 포함하는 유기광전자소자 및 표시장치 |
| KR20150041506A (ko) * | 2013-10-08 | 2015-04-16 | 제일모직주식회사 | 화합물, 이를 포함하는 유기 광전자 소자 및 표시장치 |
| KR101599965B1 (ko) | 2013-10-08 | 2016-03-04 | 제일모직 주식회사 | 화합물, 이를 포함하는 유기 광전자 소자 및 표시장치 |
| KR101759237B1 (ko) | 2013-10-08 | 2017-07-18 | 제일모직 주식회사 | 화합물, 이를 포함하는 유기광전자소자 및 표시장치 |
| US9812657B2 (en) | 2014-01-07 | 2017-11-07 | Samsung Electronics Co., Ltd. | Organometallic compound and organic light-emitting device including the same |
Also Published As
| Publication number | Publication date |
|---|---|
| US7790890B2 (en) | 2010-09-07 |
| US20070196687A1 (en) | 2007-08-23 |
| JPWO2005097940A1 (ja) | 2008-02-28 |
| EP1731584A1 (en) | 2006-12-13 |
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