WO2004107822A1 - 有機電界発光素子 - Google Patents
有機電界発光素子 Download PDFInfo
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- WO2004107822A1 WO2004107822A1 PCT/JP2004/007444 JP2004007444W WO2004107822A1 WO 2004107822 A1 WO2004107822 A1 WO 2004107822A1 JP 2004007444 W JP2004007444 W JP 2004007444W WO 2004107822 A1 WO2004107822 A1 WO 2004107822A1
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/654—Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom
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- C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
- C09K11/06—Luminescent materials, e.g. electroluminescent or chemiluminescent containing organic luminescent materials
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- H—ELECTRICITY
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional [2D] radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional [2D] radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H10K50/18—Carrier blocking layers
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/656—Aromatic compounds comprising a hetero atom comprising two or more different heteroatoms per ring
- H10K85/6565—Oxadiazole compounds
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1044—Heterocyclic compounds characterised by ligands containing two nitrogen atoms as heteroatoms
- C09K2211/1048—Heterocyclic compounds characterised by ligands containing two nitrogen atoms as heteroatoms with oxygen
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1059—Heterocyclic compounds characterised by ligands containing three nitrogen atoms as heteroatoms
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
Definitions
- the present invention relates to an organic electroluminescent device, and more particularly, to a thin film device which emits light by applying an electric field to a light emitting layer made of an organic compound.
- organic EL devices electroluminescent devices
- anode Z hole injection layer / hole transport layer / light emitting layer Z cathode In order to further improve the efficiency of such an organic EL device, the structure of the anode Z hole transport layer / light emitting layer cathode is basically used, and a hole injection layer, an electron injection layer, and an electron transport layer are appropriately provided thereon.
- Known structures include a hole injection layer / a light emitting layer, an electron transport layer, an electron injection layer, and a cathode.
- the hole transport layer has a function of transmitting holes injected from the hole injection layer to the light emitting layer
- the electron transport layer has a function of transmitting electrons injected from the cathode to the light emitting layer.
- many devices such as devices provided with the above-described hole transport layer composed of an aromatic diamine and a light-emitting layer composed of an aluminum complex of 8-hydroxyquinoline, utilize fluorescence. If phosphorescence is used, that is, if light emission from a triplet excited state is used, an efficiency improvement of about three times is expected as compared with a device using conventional fluorescence (singlet). For this purpose, the use of a coumarin derivative or a benzophenone derivative in the light-emitting layer has been studied, but an extremely low luminance was obtained. Later, as an attempt to use the triplet state, the use of a europium complex was examined, but this did not lead to highly efficient light emission.
- the main causes of the above drive deterioration are: substrate / anode / hole transport layer / light-emitting layer Z hole blocking layer / electron transport layer Z cathode or substrate / anode Z hole transport layer / light-emitting layer electron transport layer Z
- This is presumed to be due to deterioration of the thin film shape of the light emitting layer in the element structure composed of the cathode.
- This deterioration of the thin film shape is attributed to the crystallization (or aggregation) of the organic amorphous thin film due to heat generated during element driving, etc.
- the low heat resistance is attributed to the low glass transition temperature (Tg) of the material. It is thought to be derived.
- the light emitting layer is made of a carbazole compound (CBP) or a triazole compound (TAZ), and the hole blocking layer is made of a phenanthroline derivative (HB-1).
- CBP carbazole compound
- TTZ triazole compound
- HB-1 phenanthroline derivative
- these compounds have good symmetry and low molecular weight, so they easily crystallize and agglomerate to deteriorate the shape of the thin film, and Tg is difficult to observe even due to the high crystallinity.
- Such inconsistency in the shape of the thin film in the light emitting layer has the adverse effect of shortening the driving life of the device and reducing the heat resistance.
- the organic EL device using phosphorescence actually has a large problem in the driving stability of the device.
- JP2002-352957A discloses that a compound having an oxaziazol group is used as a host agent in an organic EL device in which a light emitting layer contains a host agent and a dopant that emits phosphorescence.
- TP2001-230079A discloses an organic EL device having a thiazole or pyrazole structure in an organic layer.
- JP2001-313178A discloses an organic EL device having a light-emitting layer containing a phosphorescent iridium complex compound and a carpasol compound.
- JP2003-4561 1A discloses an organic EL device having a light emitting layer containing a sorbazole compound (PVK), a compound having an oxaziazol group (PBD) and Ir (Ppy) 3 Have been.
- PVK sorbazole compound
- PPD oxaziazol group
- Ir Ir 3 Have been.
- TP200-230079A does not disclose an organic EL device utilizing phosphorescence.
- DISCLOSURE OF THE INVENTION Improvement of the driving stability and heat resistance of an organic EL device using phosphorescence is an essential requirement when considering applications such as a display device such as a flat panel display and lighting, and the present invention. In view of such circumstances, an object of the present invention is to provide an organic EL device having high efficiency and high driving stability.
- the present inventors have found that the above problems can be solved by using a specific compound for the light emitting layer, the electron transporting layer, or the hole blocking layer. Reached.
- the present invention relates to an organic electroluminescent device in which an anode, an organic layer, and a cathode are laminated on a substrate, wherein at least one organic layer has the same molecule represented by the following formula I in the same molecule.
- An azole-based compound having both a monomolecular structure and a triazole structure represented by the following formula II is present.
- Ars each independently represents an aromatic hydrocarbon ring group or an aromatic heterocyclic group which may have a substituent, but when the structure of the formula I is a divalent group, Ar! Is a single bond, and when the structure of Formula II is a divalent or trivalent group, one or both of Ar 2 ⁇ Ar 3 is a single bond.
- azole compound a compound represented by any of the following general formulas ⁇ to ⁇ is preferably exemplified.
- the present invention also provides an organic light-emitting device, wherein at least one organic layer is a light-emitting layer containing a host agent and a dopant, and the azole compound is used as the host agent. It is an electroluminescent element.
- Preferred examples of the dopant include those containing at least one selected from a phosphorescent orthometalated metal complex and a porphyrin metal complex. Further, as a central metal of the metal complex, a metal complex containing an organometallic complex containing at least one metal selected from Groups 7 to 11 of the periodic table is preferably mentioned.
- the present invention is an organic EL device characterized in that the azole compound is present in a hole blocking layer or an electron transporting layer.
- the organic electroluminescent device (organic EL device) of the present invention has at least one organic layer disposed on a substrate and between an anode and a cathode. It contains a metal compound.
- Preferred examples of the layer containing the azole compound include a light emitting layer, a hole blocking layer, and an electron transporting layer.
- the azole compound When present in the light emitting layer, the azole compound is present as a host agent, and contains a dopant emitting phosphorescence.
- a host agent is used as a main component, and a dopant is used as an auxiliary component.
- the main component means a material occupying 50% by weight or more of the material forming the layer, and the auxiliary component means other components.
- the compound serving as the host agent has an excited triplet level in an energy state higher than the excited triplet level of the phosphorescent dopant. Less than, The case where this azole compound is present as a host agent will be described.
- the host agent used in the light-emitting layer in the present invention is a compound that gives a stable thin film shape, has a high glass transition temperature (Tg), and can efficiently transport holes, Z, or electrons. is necessary. Further, the compound is required to be a compound which is electrochemically and chemically stable, and hardly generates impurities which become traps or quench light emission during production or use.
- Tg glass transition temperature
- a compound satisfying such a requirement a compound having both a 1,3,4-oxaziazole structure and a 1,2,4-triazole structure represented by the general formulas I and II (hereinafter referred to as an azole compound). use.
- Ar! A has the above-mentioned meaning, and preferred groups include the following groups.
- Ai Ar 2 and Ar 3 may be the same or different from each other.
- Ar! Is preferably an aromatic hydrocarbon group having 1 to 3 rings, and may have a substituent.
- the substituent is preferably a lower alkyl group having 1 to 5 carbon atoms.
- the number of substituents is preferably in the range of 0 to 3.
- the following aromatic hydrocarbon ring groups are preferred. Phenyl, 2-methylphenyl, 3_methylphenyl, 4-methylphenyl, 2,4-dimethylphenyl, 3,4-dimethylphenyl, 4-ethylphenyl, 2,4,5-to Limethylphenyl, 4-tert-butylphenyl, trinaphthyl, 9-anthracese, 9-phenanthrenyl and the like.
- Ar 2 is preferably a one- to three-ring aromatic hydrocarbon ring group, and may have a substituent.
- the substituent is preferably a lower alkyl group having 1 to 5 carbon atoms.
- the number of substituents is preferably in the range of 0 to 3. Specifically, the following aromatic hydrocarbon ring groups are preferred.
- Phenyl group 2-me Tylphenyl group, 3-methylphenyl group, 4-methylphenyl group, 2,4-dimethylphenyl group, 3,4-dimethylphenyl group, 2,3-dimethylphenyl group, 2,5-dimethylphenyl group, 2,6-dimethylphenyl group, 3,5-dimethylphenyl group, 4-ethylphenyl group, 2-sec-butylphenyl group, 2-tert-butylphenyl group, 4-n-butylphenyl group, 4- sec-butylphenyl group, 4_tert-butylphenyl group, trinaphthyl group, 2-naphthyl group, trianthracenyl group, 2-anthracenyl group, 9-phenanthrenyl group and the like.
- Ar 3 is preferably a one- to three-ring aromatic hydrocarbon ring group, and may have a substituent.
- the substituent is preferably a lower alkyl group having 1 to 5 carbon atoms.
- the number of substituents is preferably in the range of 0 to 3. Specifically, the following aromatic hydrocarbon ring groups are preferred.
- the azole compound used in the present invention is a compound having a 1,3,4-oxdiazole structure and a 1, I 4-triazole structure in combination.
- Each structure may have at least one or more structures.
- Each structure is preferably in the range of 1 to 2, and preferably in the range of 2 to 4 in total.
- Preferred azo compounds include compounds represented by the above general formulas IV to VIII.
- ⁇ ] ⁇ is the same group as described in the general formulas I and II, but is not a single bond.
- X! Is a divalent linking group, and comprises a divalent aromatic hydrocarbon ring group.
- the divalent linking group a monocyclic or bicyclic aromatic hydrocarbon ring group is preferable. Specifically, the following divalent aromatic hydrocarbon ring groups are preferred. 1,4-phenylene group, 1,3-phenylene group, 1,4-naphthylene group, 2,6-naphthylene group, 4,4′-biphenylene group and the like.
- the azole compound used in the present invention is characterized by having both an oxadiazole structure and a triazole structure.
- compounds having an oxaziazole structure or a triazole structure alone for example, PBD and TAZ
- PBD and TAZ have high crystallinity, and therefore have poor thin film stability and are not practical as organic EL device materials.
- This high crystallinity is thought to be due to strong intermolecular interactions due to the presence of relatively polar functional groups such as oxaziazole and triazole groups.
- the organic EL device of the present invention contains the host material in the light-emitting layer
- the light-emitting layer contains a minor component, that is, a phosphorescent dopant.
- a phosphorescent dopant known phosphorescent metal complex compounds described in the above-mentioned literatures can be used, and the central metal of those metal complexes preferably contains a metal selected from Groups 7 to 11 of the periodic table. It is a phosphorescent organometallic complex.
- the metal is a metal selected from ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum and gold.
- the doping agent and the metal may be one kind or two or more kinds.
- Phosphorescent dopants are known as described in JP2002-352957A and the like. You. Further, the phosphorescent dopant is preferably a phosphorescent ortho-metalated metal complex or a polyphyllin metal complex. Such an ortho-metalated metal complex or a porphyrin metal complex is described in JP2002-15809 and the like. Is known. Therefore, these known phosphorescent doping agents can be widely used.
- Preferred organometallic complexes include complexes (formula A) such as Ir (Ppy) 3 having a noble metal element such as Ir as a central metal, complexes (formula B) such as Ir (bt) 2'acac3, and PtOEt3. (Formula C).
- the azo compound may be present in a layer other than the light emitting layer.
- the compound to be present in the light emitting layer may be a known light emitting material or may not include a dopant.
- it is preferably present in the hole-blocking layer or the electron-transporting layer.
- it may be present in another layer, or together with other compounds or in combination with other compounds. May be present in the same layer.
- an anode 2 a hole injection layer 3, a hole transport layer 4, a light emitting layer 5, a hole blocking layer 6, an electron transport layer 7, and a cathode 8 are stacked on a substrate 1.
- BEST MODE FOR CARRYING OUT THE INVENTION an example of an organic EL device of the present invention will be described with reference to the drawings. You. FIG.
- FIG. 1 is a cross-sectional view schematically showing an example of the structure of a general organic EL device used in the present invention, wherein 1 is a substrate, 2 is an anode, 3 is a hole injection layer, 4 is a hole transport layer, 5 represents a light emitting layer, 6 represents a hole blocking layer, 7 represents an electron transport layer, and 8 represents a cathode.
- the hole injection layer 3 to the electron transport layer 7 are organic layers
- the organic EL device of the present invention has one or more organic layers including the light emitting layer 5. It is advantageous to have three or more, more preferably five or more organic layers including the light emitting layer 5.
- FIG. 1 is an example, and in addition to this, one or more layers can be provided, and one or more layers can be omitted.
- the substrate 1 serves as a support for the organic EL element, and may be a quartz or glass plate, a metal plate or metal foil, a plastic film or sheet, or the like.
- a glass plate or a plate made of a transparent synthetic resin such as polyester, polymethacrylate, polyacrylonitrile, polysulfone or the like is preferable.
- a synthetic resin substrate it is necessary to pay attention to gas barrier properties. If the gas barrier property of the substrate is too small, the organic EL element may be deteriorated by outside air passing through the substrate, which is not preferable. Therefore, a method of providing a dense silicon oxide film or the like on at least one surface of the synthetic resin substrate to secure gas barrier properties is also one of the preferable methods.
- An anode 2 is provided on the substrate 1, and the anode 2 plays a role of injecting holes into the hole transport layer.
- the anode is typically made of a metal such as aluminum, gold, silver, nickel, palladium, platinum, a metal oxide such as indium and oxides of Z or tin, a metal halide such as copper iodide, carbon black, or poly. It is composed of conductive polymers such as (3-methylthiophene), polypyrrol and polyaniline.
- the formation of the anode 2 is usually performed by a sputtering method, a vacuum evaporation method, or the like in many cases.
- the anode is dispersed in an appropriate binder resin solution and applied to the substrate 1 to form an anode. 2 can also be formed.
- a conductive polymer a thin film can be formed directly on the substrate 1 by electrolytic polymerization, or the conductive polymer can be applied on the substrate 1 to form the anode 2.
- the anode 2 can be formed by laminating different materials. The thickness of the anode 2 depends on the required transparency. When transparency is required, it is desirable that the visible light transmittance is usually 60% or more, preferably 80% or more. In this case, the thickness is usually 5 to 1000 nm, preferably It is about 10 to 500 nm. If opaque, the anode 2 may be the same as the substrate 1. Further, it is also possible to laminate a different conductive material on the anode 2.
- a hole injection layer 3 may be inserted between the hole transport layer 4 and the anode 2. ing.
- the insertion of the hole injection layer 3 has the effect of reducing the initial drive voltage of the device and suppressing the voltage rise when the device is continuously driven with a constant current.
- the conditions required for the material used for the hole injection layer are that the contact with the anode is good, a uniform thin film can be formed, and the film is thermally stable, that is, the melting point and the glass transition temperature are high. 300 or more, and glass transition temperature of 100 ° C or more is required. Furthermore, the ionization potential is low, holes can be easily injected from the anode, and the hole mobility is high.
- phthalocyanine compounds such as copper phthalocyanine, organic compounds such as polyaniline and polythiophene, and sputter-carbon films, vanadium oxide, ruthenium oxide, molybdenum oxide, etc. Metal oxides have been reported.
- a thin film can be formed in the same manner as the hole transport layer, but in the case of an inorganic substance, a sputtering method, an electron beam evaporation method, or a plasma CVD method is further used.
- the thickness of the hole injection layer 3 formed as described above is usually 3 to 100 nm, preferably 5 to 50 nm.
- a hole transport layer 4 is provided on the hole injection layer 3.
- the conditions required for the material used in the hole transport layer are a material that has a high hole injection efficiency from the hole injection layer 3 and that can efficiently transport the injected holes. is necessary. For this purpose, it is required that the ionization potential is low, the transparency to visible light is high, the hole mobility is high, the stability is high, and impurities serving as traps are hardly generated during manufacturing and use. You. Further, it is required that the light emitted from the light emitting layer is not quenched in order to come into contact with the light emitting layer 5 or that an exciplex is formed between the light emitting layer and the light emitting layer so that the efficiency is not reduced. In addition to the above general requirements, when considering applications for in-vehicle display, the element is required to have further heat resistance. Therefore, a material having a Tg of 90 ° C. or more is desirable.
- Examples of such a hole transport material include, for example, two or more condensed aromatic compounds containing two or more tertiary amines represented by 4,4'-bis [N- (tonaphthyl) -N-phenylamino] biphenyl. Diamines in which the aromatic ring is substituted with a nitrogen atom, 4,4 ', 4 "-tris U-naphthylphenylamino) triphenylamine, an aromatic amine compound having a starburst structure, and triphenylamine And aromatic compounds such as 2,2 ', 7,7'-tetrakis- (diphenylamino) -9,9'-spirobifluorene, etc. These compounds may be used alone.
- examples of the material of the hole transport layer 4 include polymer materials such as polyvinyl carbazole, polyvinyl triphenylamine, and polyarylene ether sulfone containing tetraphenylbenzidine.
- the coating method one or more hole transport materials and, if necessary, additives such as a binder resin which does not trap holes and a coating improver are added and dissolved to form a coating solution. It is prepared, applied on the anode 2 or the hole injection layer 3 by a method such as spin coating, and dried to form the hole transport layer 4.
- examples of the binder resin include polycarbonate, polyarylate, and polyester. If the amount of the binder resin is large, the hole mobility decreases, so the smaller the amount, the better.
- vacuum deposition method it puts a hole transporting material Rutsupo placed in a vacuum vessel, after evacuating to about 10- 4 P a with a suitable vacuum pump vacuum vessel, and heating the Rutsupo Then, the hole transporting material is evaporated, and the hole transporting layer 4 is formed on the substrate 1 on which the anode is formed, which is placed facing the crucible.
- the thickness of the hole transport layer 4 is usually 5 to 300 nm, preferably 10 to 10 O Onm. In order to uniformly form such a thin film, a vacuum deposition method is generally used.
- the light emitting layer 5 is provided on the hole transport layer 4.
- the light-emitting layer 5 contains the host agent and a dopant that emits phosphorescence. Between the electrodes to which an electric field is applied, holes that are injected from the anode and move through the hole transport layer, and electrons that are injected from the cathode and are injected from the cathode. It is excited by recombination with electrons moving through the transport layer 7 (or the hole blocking layer 6), and emits strong light.
- the conditions required for the material used for the light-emitting layer host agent are that the hole injection efficiency from the hole transport layer 4 is high, and The charge from the electron transport layer 7 (or the hole blocking layer 6) It is necessary that the electron injection efficiency is high.
- the ionization potential has an appropriate value, the mobility of holes and electrons is large, the electrical stability is excellent, and impurities serving as traps are hardly generated during production or use. You.
- exciplexes are not formed between the adjacent hole transport layer 4 and the electron transport layer 7 (or the hole blocking layer 6) so that the efficiency is not reduced.
- the element when considering applications for in-vehicle display, the element is required to have further heat resistance. Therefore, a material having a Tg value of 90 ° C or more is desirable.
- the light emitting layer may contain other components such as a host material and a fluorescent dye other than the azo compound as long as the performance of the present invention is not impaired.
- the light-emitting layer may be made of any known compound such as a known host material and a dopant material. It is also possible to use a single light emitting material that does not depend on the combination of the host material and the guest material. In this case, the azole compound is present in the hole blocking layer or the electron transport layer.
- the amount contained in the light emitting layer is preferably in the range of 0.1 to 30% by weight. If it is less than 0.1% by weight, it cannot contribute to the improvement of the luminous efficiency of the device. If it exceeds 30% by weight, concentration quenching such as formation of a dimer between organometallic complexes occurs, leading to a decrease in luminous efficiency. In a device using conventional fluorescence (singlet), a slightly larger amount of the fluorescent dye (dopant) contained in the light emitting layer tends to be preferable.
- the organometallic complex may be partially contained in the light emitting layer in the thickness direction or may be unevenly distributed.
- the thickness of the light emitting layer 5 is usually 10 to 200 nm, preferably 20 to 100 nm.
- a thin film is formed in the same manner as the hole transport layer 4.
- the light emitting layer 5 is advantageously formed by a vacuum deposition method. Host agent, put both doping agent Rutsupo placed in a vacuum vessel, after evacuating to a 10-about 4 Pa vacuum vessel with an appropriate vacuum pump, heating the Rutsupo, host agent, dough Both the masking agents are co-evaporated to form on the hole transport layer 4. At this time, the content of the doping agent in the host agent is controlled while monitoring the deposition rate separately for the host agent and the doping agent.
- the hole blocking layer 6 is laminated on the light emitting layer 5 so as to be in contact with the interface of the light emitting layer 5 on the cathode side, and prevents holes moving from the hole transport layer from reaching the cathode. It is made of a compound capable of efficiently transporting electrons injected from the cathode toward the light emitting layer.
- the physical properties required of the material constituting the hole blocking layer require high electron mobility and low hole mobility.
- the hole blocking layer 6 has a function of confining holes and electrons in the light emitting layer and improving luminous efficiency.
- the electron transport layer 7 is formed of a compound capable of efficiently transporting electrons injected from the cathode between the electrodes to which an electric field is applied in the direction of the hole blocking layer 6.
- the electron-transporting compound used in the electron-transporting layer 7 should be a compound that has a high electron injection efficiency from the cathode 8 and has a high electron mobility and can efficiently transport injected electrons. is necessary.
- Materials satisfying such conditions include metal complexes such as aluminum complexes of 8-hydroxyquinoline, metal complexes of 10-hydroxybenzo [h] quinoline, oxazidazole derivatives, distyrylbiphenyl derivatives, silole derivatives, and the like.
- metal complexes such as aluminum complexes of 8-hydroxyquinoline, metal complexes of 10-hydroxybenzo [h] quinoline, oxazidazole derivatives, distyrylbiphenyl derivatives, silole derivatives, and the like.
- 5-hydroxyflavone metal complex benzoxazole metal complex
- benzothiazole metal complex trisbenzimidazolylbenzene
- quinoxaline compound quinoxaline compound
- phenanthroline derivative 2- 1-butyl-9, 10-N
- ⁇ '-Jisianoa Examples include nthraquinone dimine, n-type hydrogenated amorphous silicon carbide, n-type zinc sulf
- the electron transport layer 7 is formed by laminating on the hole blocking layer 6 by a coating method or a vacuum deposition method in the same manner as the hole transport layer 4. Usually, a vacuum evaporation method is used.
- the cathode 8 plays a role of injecting electrons into the light emitting layer 5.
- the material used for the cathode 8 can be used, but for efficient electron injection, a metal having a low work function is preferable, and tin, magnesium, indium, calcium, Suitable metals such as aluminum and silver or alloys thereof are used. Specific examples include low work function alloy electrodes such as magnesium-silver alloy, magnesium-indium alloy, and aluminum-lithium alloy.
- the interface L iF the cathode and the electron transport layer by also, effective method for on improvement of efficiency of the device for inserting the MgF 2, L i 2 0 such ultrathin insulating film (0. l ⁇ 5nm) is there.
- the thickness of the cathode 8 is usually the same as that of the anode 2.
- an additional layer of a metal having a high work function and being stable to the atmosphere increases the stability of the device.
- metals such as aluminum, silver, copper, nickel, chromium, gold and platinum are used.
- a cathode 8 a hole blocking layer 6, a light emitting layer 5, a hole transport layer 4, and an anode 2 are arranged on the substrate 1 in this order, or the substrate 1 has a cathode 8 and an electron transport layer 7 Z
- a hole blocking layer 6 / a light-emitting layer 5Z a hole transport layer 4 / a hole injection layer 3 / anode 2 can be stacked in this order.
- 3,4-BP0T is the compound of No.55 in Table 8.
- an organic EL device having a layer structure in which the hole injection layer 3 and the hole blocking layer 6 were omitted was produced as follows.
- Electrode area 2X2 Dragon 2 on a cleaned glass substrate with IT0 electrodes (manufactured by Sanyo Vacuum), while controlling the evaporation rate with a ULVAC quartz crystal type film thickness controller using a resistance heating type vacuum evaporation system.
- the 4,4′-bis [ ⁇ , ⁇ ′-(3-tolyl) amino is deposited on the IT0 layer (anode 2) of the glass substrate 1 with IT0 under a condition of a vacuum degree of 7 to 9 XlO— 4 Pa during vapor deposition. ] -3,3, -Dimethylbiphenyl (hereinafter, HMTPD) was formed to a thickness of 60 ⁇ to form the hole transport layer 4.
- Ir (Ppy) 3 tris (2-phenylpyridine) iridium complex
- the light emitting layer 5 was formed in a thickness of 25 ⁇ from different evaporation sources by a dual simultaneous evaporation method. At this time, the concentration of Ir (Ppy) 3 was 7% by weight.
- a 50 nm-thick film of tris (8-hydroxyquinoline) aluminum (hereinafter, A1Q 3 ) was formed thereon in the same vacuum evaporation apparatus without breaking the vacuum to obtain an electron transporting layer 7. Furthermore, while maintaining the vacuum condition, lithium fluoride (hereinafter referred to as LiF) Aluminum was deposited to a thickness of ⁇ to form a cathode 8.
- LiF lithium fluoride
- Example 3 An organic EL device was prepared in the same manner as in Example 1, except that 3,4-BPOT was used as the main component of the light emitting layer 5. Table 15 shows the device characteristics.
- Example 3 An organic EL device was prepared in the same manner as in Example 1, except that 3,4-BPOT was used as the main component of the light emitting layer 5. Table 15 shows the device characteristics.
- Example 3 An organic EL device was prepared in the same manner as in Example 1, except that 3,4-BPOT was used as the main component of the light emitting layer 5. Table 15 shows the device characteristics.
- Example 3 An organic EL device was prepared in the same manner as in Example 1, except that 3,4-BPOT was used as the main component of the light emitting layer 5. Table 15 shows the device characteristics.
- Example 3 An organic EL device was prepared in the same manner as in Example 1, except that 3,4-BPOT was used as the main component of the light emitting layer 5. Table 15 shows the device characteristics.
- An organic EL device was prepared in the same manner as in Example 1, except that 3,5-BP0T was used as the main component of the light emitting layer 5. It was confirmed that light emission from Ir (Ppy) 3 was obtained from this organic EL device. Comparative Example 1
- Organic EL was prepared in the same manner as in Example 1 except that 3-phenyl-4- ( ⁇ -naphthyl) -5-phenyl-1,2,4-triazole (hereinafter, TAZ) was used as a main component of the light emitting layer 5. A device was created.
- TAZ 3-phenyl-4- ( ⁇ -naphthyl) -5-phenyl-1,2,4-triazole
- an organic EL device having a layer structure in which the hole injection layer 3 was omitted was manufactured as follows.
- An ITO layer (anode 2) was provided in the same manner as in Example 1, and N, N'-di A hole transport layer 4 was formed by forming naphthyl N, N'-diphenyl 4,4'-diaminobiphenyl (hereinafter referred to as NPD) with a thickness of 40 ⁇ .
- NPD naphthyl N, N'-diphenyl 4,4'-diaminobiphenyl
- CBP 4,4'- ⁇ , N'-dicarbazolediphenyl
- Ir Ppy 3
- the concentration of Ir (Ppy) 3 was 6 wt%.
- a POT was formed to a thickness of 6 nm in the same vacuum evaporation apparatus without breaking the vacuum to obtain a hole blocking layer 6.
- an electron transporting layer 7 A1Q 3 while maintaining the vacuum condition is formed with a thickness of 20 nm.
- a cathode 8 was formed thereon by depositing 0.6 nni of LiF and 150 ⁇ of aluminum while maintaining vacuum conditions.
- An organic EL device was prepared in the same manner as in Example 4, except that 3,5-BP0T was used as the hole blocking layer 6.
- Comparative Example 2 An organic EL device was fabricated in the same manner as in Example 4, except that 2,9-dimethyl_4,7-diphenyl-1,10-phenanthroline phosphorus (hereinafter, BCP) was used as the hole blocking layer 6.
- BCP 2,9-dimethyl_4,7-diphenyl-1,10-phenanthroline phosphorus
- Table 15 summarizes the device characteristics.
- Tg Glass transition temperature
- the organic EL device of the present invention may be any of a single device, a device having a structure arranged in an array, and a structure in which an anode and a cathode are arranged in an XY matrix shape. It can also be applied in By including a compound having a specific skeleton in the light-emitting layer and a phosphorescent metal complex in the organic EL device of the present invention, the luminous efficiency and driving are higher than those of a conventional device using light emission from a singlet state. A device with greatly improved stability can be obtained, and excellent performance can be achieved when applied to a full-color or multi-color panel.
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Abstract
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| JP2005506519A JP4673744B2 (ja) | 2003-05-29 | 2004-05-25 | 有機電界発光素子 |
| US10/557,595 US20060186791A1 (en) | 2003-05-29 | 2004-05-25 | Organic electroluminescent element |
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| JP2003-153195 | 2003-05-29 | ||
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Also Published As
| Publication number | Publication date |
|---|---|
| CN100483779C (zh) | 2009-04-29 |
| TW200504174A (en) | 2005-02-01 |
| KR20060016099A (ko) | 2006-02-21 |
| TWI341860B (ja) | 2011-05-11 |
| JPWO2004107822A1 (ja) | 2006-07-20 |
| US20060186791A1 (en) | 2006-08-24 |
| CN1765158A (zh) | 2006-04-26 |
| JP4673744B2 (ja) | 2011-04-20 |
| KR101032355B1 (ko) | 2011-05-03 |
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