WO2006073072A1 - 有機エレクトロルミネッセンス素子 - Google Patents
有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2006073072A1 WO2006073072A1 PCT/JP2005/023721 JP2005023721W WO2006073072A1 WO 2006073072 A1 WO2006073072 A1 WO 2006073072A1 JP 2005023721 W JP2005023721 W JP 2005023721W WO 2006073072 A1 WO2006073072 A1 WO 2006073072A1
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- Prior art keywords
- organic
- light emitting
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- emitting layer
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- 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 radiating surfaces
- H05B33/20—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- 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 radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1003—Carbocyclic compounds
- C09K2211/1011—Condensed systems
-
- 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]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
- H10K85/1135—Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/115—Polyfluorene; Derivatives thereof
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/151—Copolymers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/626—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
Definitions
- the present invention relates to an organic electroluminescent device, and in particular, a hole injection and transport layer and a light emitting layer are formed by a wet method, the hole injection and transport layer are made of a polymer material, and the light emitting layer is made of a low molecular weight material.
- the present invention relates to an organic electoluminescence device formed of a light emitting material.
- electroluminescence organic electroluminescence devices
- Organic EL devices have the advantages of not only a wide viewing angle and excellent contrast, but also a quick response time as a spontaneous emission type display device.
- Organic thin film layers such as a light-emitting layer forming an organic EL element are formed by a dry method such as a vacuum evaporation method or a wet method such as spin coating or ink jet.
- the dry method has an advantage in that it is not necessary to remove the solvent after film formation without having to dissolve the material for forming the organic thin film layer in the solvent.
- the vacuum deposition method is a high-vacuum process that requires large-scale equipment, it has disadvantages such as high manufacturing costs, inability to apply to large screen substrates, and difficulty in mass production. .
- a high-molecular material such as a soluble PPV (poly (p_phenylenevinylene)) into which a functional group that improves the solubility characteristics in an organic solvent is introduced is used.
- a soluble PPV poly (p_phenylenevinylene)
- the film was generally formed by a dry method.
- an organic EL device formed by a spin coating method is disclosed in which the hole injection layer and the light emitting layer are both made of a polymer material. (For example, see Patent Document 1).
- the polymer material has a molecular weight distribution and is difficult to purify and is not easily purified. As a result, it has a problem that when used in an organic EL device, the color purity, luminous efficiency, luminance, etc. of the emitted color are low.
- a light emitting layer using a low molecular weight compound has a shorter synthesis route than the PPV and can be easily manufactured, and can be purified to a high purity by a known technique such as column chromatography or recrystallization. For this reason, when used in organic EL devices, it has the advantages of excellent luminous efficiency and half life of luminance, and abundant nourishment of colors with high color purity.
- Patent Document 1 International Publication No. 2004/84260 Pamphlet
- the present invention has been made in view of the above-described problems, and an object thereof is to provide an organic EL element in which a light emitting layer using a low molecular light emitting material is formed by a wet method.
- the present inventor has found a compound that is soluble in an organic solvent even if it is a low-molecular light-emitting material. Further, by forming a layer formed before the formation of the light emitting layer, specifically, a hole injection / transport layer with a polymer compound, it was found that both layers can be formed by a wet method, and the present invention was completed. It was.
- the following organic EL device is provided.
- An anode, a hole injecting / transporting layer, a light emitting layer, and a cathode are laminated in this order, and the light emitting layer is obtained by depositing a low molecular light emitting material by a wet method.
- An organic electoluminescence device, which is a molecular light-emitting layer, and the hole injection / transport layer is a polymer hole injection / transport layer obtained by forming a polymer material by a wet method.
- a 1 to A 5 are aryl groups having 6 to 50 nuclear carbon atoms which may have a substituent or heteroaryl groups having 5 to 50 nucleus atoms which may have a substituent.
- a 6 to A 8 are hydrogen, an aryl group having 6 to 50 nuclear carbon atoms which may have a substituent, or a heteroaryl group having 5 to 50 nuclear atoms which may have a substituent. It is.
- a 1 and A 2 are not identical
- a 7 and A 8 are not identical.
- a 3 to A 6 may be the same or different.
- I ⁇ to R 6 are substituents which may be the same or different.
- s 1 to s 3 , s 5 , and s 6 are integers of 0 to 4, which may be the same or different.
- s 4 is an integer from 0 to 3. If ss 6 is 2 or more, each! ⁇ ⁇ May be the same or different. ]
- R 7 to R 12 are substituents, which may be the same or different. Further, they may be bonded to each other to form a ring structure.
- Ar 1 , Ar 3 , Ar 4 , Ar 6 , Ar 8 and Ar 1Q are arylene groups having 6 to 50 nuclear carbon atoms which may have a substituent.
- Ar 2 , Ar 5 , Ar 7 , Ar 9 and Ar 11 are aryl groups having 6 to 50 nuclear carbon atoms which may have a substituent.
- n is an integer.
- the hole injection / transport layer and the light emitting layer can be formed by a wet method, a large-area organic EL display that cannot be realized by a dry method such as a vacuum evaporation method can be manufactured.
- an organic EL device with excellent light emission efficiency, brightness, and half-life with good color purity can be produced with high productivity.
- FIG. 1 is a cross-sectional view showing one embodiment of an organic EL device of the present invention.
- the organic EL device of the present invention includes an anode, a hole injection / transport layer, a light emitting layer, and a cathode laminated in this order.
- the light emitting layer is a low molecular light emitting layer obtained by depositing a low molecular light emitting material by a wet method, and the hole injection / transport layer is formed by a wet method. It is characterized in that it is a polymer hole injection / transport layer obtained by film formation.
- the hole injection / transport layer is a layer formed between the anode and the light emitting layer, which assists the injection of holes into the light emitting layer and transports it to the light emitting region, and has a single layer structure or hole injection.
- a layered structure in which the layer and the hole transport layer are separate layers is also included.
- at least one layer may be formed by depositing a polymer material by a wet method.
- the low-molecular light-emitting material used for the light-emitting layer is not particularly limited as long as it is soluble in an organic solvent and can be formed by a wet method, but it is not limited in the organic solvent of the light-emitting material.
- the solubility is preferably 0.1% by weight or more.
- the thickness of the light emitting layer of the organic EL device is usually 10 to 100 nm, and generally 50 nm in many cases. When this film thickness is formed by a wet method, it is desired that at least 0.1% by weight or more of the luminescent material is dissolved.
- the solubility of the luminescent material is preferably 0.5% by weight or more, particularly 1% by weight or more because a film thickness of 50 nm, which is a typical thickness, is formed.
- an asymmetric low molecular weight compound can be used because of its high solubility in an organic solvent.
- compounds represented by the following formulas (1) to (3) can be used.
- Ai ⁇ A 5 is an Ariru group or location heteroaryl group substituent optionally also to be 5 to 50 ring atoms of having the optionally ring carbon atoms which may 6-50 substituted A 6 to A 8 have hydrogen, an aryl group having 6 to 50 nuclear carbon atoms which may have a substituent, or a substituent. And a heteroaryl group having 5 to 50 nuclear atoms.
- a 1 and A 2 are not identical
- a 7 and A 8 are not identical.
- a 3 to A 6 may be the same or different.
- I ⁇ to R 6 are substituents which may be the same or different.
- s 1 to s 3 , s 5 , and s 6 are integers of 0 to 4, which may be the same or different.
- s 4 is an integer from 0 to 3. If ss 6 is 2 or more, each RR 6 may be the same or different. ]
- aryl group having 6 to 50 nuclear carbon atoms which may have a substituent which is Ai A 8 include phenyl, 2-biphenylyl, 3-biphenylyl, 4- Biphenylyl, terfelylinole, 2_ (1—naphthyl) phenyl, 2_ (2 naphthyl) phenyl, 3 _ (1 naphthyl) phenyl, 3_ (2 naphthyl) phenyl, 4- (1—naphthyl) phenyl, 4- (2 naphthyl) phenyl, 3,5-diphenylphenyl, 3,4-diphenylphenyl, 3,5-di (1-naphthyl) phenyl, 3,5-di (2naphthyl) phenyl, 6 _ 2-naphthylene 2-phenyl, 2- (1 naphthyl) naphthalene 2-yl,
- heteroaryl group having 5 to 50 nuclear atoms which may have a substituent include furan, thiophene, pyrrole, imidazole, pyrazole, triazonole, oxadiazoinole, pyridine, Examples include pyrazine, triazine, benzofuran, dibenzofuran, benzothiophene, dibenzothiophene, and power rubazole.
- examples of the substituent represented by RR 6 include methinole, ethyl, 1_propyl, 2-propinole, 1-butyl, 2-butyl, sec-butyl, tert-butyl, pentyl, and the like.
- Alkyl group butyl, propenyl, butyr, pentul, oleinole, eicosapentaenyl, docosahexaenyl, 2,2-diphenylvinyl, 1,2,2-triphenylvinyl, 2-phenyl-2-propenyl
- Alkenyl groups such as ethynyl, methylethynyl, phenylethyl, etc., methoxy, ethoxy, 1_propyloxy, 2_propoxy, 1-butyloxy, 2-butyloxy, sec-butyloxy, tert_butyloxy, pentyloxy, hexyloxy , Octyloxy, Decyloxy, Dodecyloxy, 2-Ethylhexyloxy, 3,7-Dimethyloctyloxy, Cyclopropynoxy, Cyclopentyloxy, Cyclohexyloxy, 1-Adamantyloxy, 2
- Examples of the polymer material that forms the hole injection / transport layer include light-emitting materials that are soluble in organic solvents, such as polyvinylcarbazole and its derivatives, polyfluorene and its derivatives, Polyaniline and derivatives thereof, polysilane and derivatives thereof, polysiloxane derivatives having an aromatic amine in the side chain or main chain, polythiophene and derivatives thereof, polypyrrole and the like can be used.
- organic solvents such as polyvinylcarbazole and its derivatives, polyfluorene and its derivatives, Polyaniline and derivatives thereof, polysilane and derivatives thereof, polysiloxane derivatives having an aromatic amine in the side chain or main chain, polythiophene and derivatives thereof, polypyrrole and the like can be used.
- the weight average molecular weight (Mw) of the polymer material is preferably 50,000 to 300,000, and more preferably 100,000 to 200,000. If the Mw is less than 50,000, when the light emitting layer is formed, the low molecular component in the polymer material is dropped and dots are generated in the hole injecting / transporting layer. There is a risk of deteriorating the element. On the other hand, if it exceeds 300,000, the material will be gelled, which may make film formation difficult.
- the weight average molecular weight (Mw) is a value obtained by calculating a polystyrene equivalent weight average molecular weight by gel permeation chromatography (GPC) using tetrahydrofuran as a solvent.
- a polymer material having a fluorene skeleton can be preferably used.
- polymer materials represented by the following formulas (4) to (6) are preferable.
- R 7 to R 12 are substituents, which may be the same or different. Further, they may be bonded to each other to form a ring structure.
- Ar 1 , Ar 3 , Ar 4 , Ar 6 , Ar 8 and Ar 1Q are arylene groups having 6 to 50 nuclear carbon atoms which may have a substituent.
- Ar 2 , Ar 5 , Ar 7 , Ar 9 and And Ar 11 is an aryl group having 6 to 50 nuclear carbon atoms which may have a substituent.
- n is an integer.
- the substituent is R 7 to R 12, for example, Mechinore, Echiru, 1-flop Ropinore, 2 Puropinore, 1-butyl, 2-butyl, sec- butyl, tert- butyl, Alkyl groups such as pentynol, hexyl, 2-ethylhexyl, octyl, decyl, dodecinole, 2_ethylhexyl, 3,7-dimethyloctyl, butyl, propenyl, butyr, pentenyl, oleyl, eicosa Alkenyl groups such as pentaenyl and docosahexaenyl, methoxy, ethoxy, 1_propyloxy, 2_propyloxy, 1-butyloxy, 2-butynoleoxy, sec-butinoreoxy, tert-butinoreoxy, pentinoreoxy, hexenor
- Examples of the ring structure formed by R 7 to R 12 include fluorene, cyclopentane, cyclohexane, and indane.
- aryl group having 6 to 50 nuclear carbon atoms which may have a substituent which is Ar 2 , Ar 5 , Ar 7 , Ar 9 and Ar "include phenyl, 2-biphenyl Ril, 3-biphenylyl, 4-biphenylyl, terfenylyl, 3,5-diphenylphenyl, 3,4-diphenylphenyl, 3,5-di (1-naphthyl) phenyl, 3 , 5-di (2-naphthyl) phenyl, fluorenyl, 1-naphthynole, 2-naphthinole, 9-one linole, 2-anthrinole, 9-1-phenane-linole, 1_hylenenole, chrycenyl, naphthacenyl, coronyl, etc. Can be mentioned.
- the light emitting layer and the hole injecting / transporting layer are formed by a wet method using the low molecular light emitting material and the polymer material described above. Specifically, the material for forming each layer is dissolved in an organic solvent, and the film is formed by applying and drying the layer at the formation site.
- Organic solvents that dissolve the above materials include alcohols such as methanol, ethanol, propanol, isopropanol, n-butanol, t-butanol, pentanol, hexanol, cyclohexanol, methyl sequestration solve, ethethyl sequestration solve, and ethylene glycol.
- alcohols such as methanol, ethanol, propanol, isopropanol, n-butanol, t-butanol, pentanol, hexanol, cyclohexanol, methyl sequestration solve, ethethyl sequestration solve, and ethylene glycol.
- a light emitting layer and a hole injection / transport layer are formed by a wet method.
- the wet method uses a solution in which a specific compound is dissolved in a solvent, such as spin coating method, ink jet method, coating method, dielectric method, spray method, dipping coating method, screen printing method, roll coater method, LB method, etc. This is a method for forming a film.
- a solvent such as spin coating method, ink jet method, coating method, dielectric method, spray method, dipping coating method, screen printing method, roll coater method, LB method, etc.
- the organic EL device of the present invention may employ known configurations for other configurations as long as it has the above-described light emitting layer and hole injection / transport layer.
- embodiments of the organic EL device of the present invention will be described.
- FIG. 1 is a cross-sectional view showing one embodiment of the organic EL element of the present invention.
- This organic EL device has a structure in which a hole injection / transport layer 22, a light emitting layer 24, and an electron injection layer 26 are laminated in this order between an anode 10 and a cathode 30.
- the anode of the organic EL device of the present invention plays a role of injecting holes into the hole transport layer or the light emitting layer, and it is effective to have a work function of 4.5 eV or more.
- Specific examples of the anode material used in the present invention include tin-doped indium oxide alloy (ITO), tin oxide (NESA), gold, silver, platinum, copper, and the like.
- the cathode is preferably made of a material having a low work function for the purpose of injecting electrons into the electron transport layer or the light emitting layer.
- the anode is a thin film formed from these electrode materials by vapor deposition or sputtering. It is possible to produce power S.
- the transmittance of the light emitted from the anode is preferably greater than 10%.
- the sheet resistance of the anode is preferably several hundred ⁇ / mouth or less.
- the film thickness of the anode is a force depending on the material, and is usually selected in the range of 10 nm to l z m, preferably 10 to 200 nm.
- the hole injecting / transporting layer has the above-described function, and has a high ion mobility and a low ionization energy of 5.5 eV or less.
- a material that transports holes to the light emitting layer with lower electric field strength is preferable.
- the mobility of holes for example, an electric field of 10 4 to: 10 6 V / cm
- at least lCT 4 cm 2 / V ′ second is preferable.
- the light emitting layer of the organic EL device of the present invention has the following functions.
- injection function a function capable of injecting holes from the anode or hole injection layer when an electric field is applied and a function of injecting electrons from the negative electrode or electron injection layer;
- Transport function function to move injected charges (electrons and holes) by the force of electric field
- light emission function function to provide a field for recombination of electrons and holes and connect this to light emission
- the content of the above-mentioned low-molecular light emitting material of the emission layer is 10 to: more preferably 100 molar% is preferred instrument 50-99 mol 0/0.
- the light emitting layer may further contain a fluorescent or phosphorescent dopant.
- a styrylamine compound represented by the following formula (7) or an arylamine compound represented by the formula (8) can be preferably used.
- Ar 15 and Ar lb are each a hydrogen atom or an aromatic group having 6 to 20 carbon atoms, and Ar ′′ to Ar 16 may be substituted. It is an integer of 4. More preferably, Ar 15 and / or Ar 16 is substituted with a styryl group.
- the aromatic group having 6 to 20 carbon atoms is preferably a phenyl group, a naphthyl group, an anthranyl group, a phenanthryl group, a terphenyl group, or the like.
- Ar to Ar are aryl groups having 5 to 40 nuclear atoms which may be substituted.
- Q is an integer of:! To 4
- aryl groups having 5 to 40 nuclear atoms include phenyl, naphthyl, anthranyl, phenanthryl, pyreninole, coloninole, biphenylinole, terfeninole, pyrrolylyl, furaninole, thiophenyl, and benzothiol.
- aryl group having 5 to 40 nucleus atoms may be substituted with a substituent.
- Preferred substituents are alkyl groups having 6 to 6 carbon atoms (ethyl group, methyl group, i_propyl group).
- aryl group having 5 to 40 nuclear atoms nucleus An amino group substituted with an aryl group having 5 to 40 atoms, an ester group having an aryl group having 5 to 40 nuclear atoms, an ester group having an alkyl group having 1 to 6 carbon atoms, a cyano group, a nitro group, a halogen Atom (chlorine, bromine, iodine, etc. ).
- the phosphorescent dopant is selected from iridium (Ir), ruthenium (Ru), palladium (Pd), platinum (Pt), osmium (Os) and rhenium (Re).
- Preferred ligands that are metal complexes containing at least one metal include phenylpyridine. It preferably has at least one skeleton selected from the group consisting of a skeleton, a bibilidyl skeleton, and a phenantorin skeleton.
- Such a metal complex include, for example, tris (2-phenylenepyridine) iridium, tris (2-phenylenepyridine) ruthenium, tris (2-phenylenediamine) palladium, bis (2-phenylenepyridine).
- Powers that include platinum, tris (2-phenylpyridine) osmium, tris (2-phenylpyridine) rhenium, otaethyl platinum porphyrin, octaphenyl platinum porphyrin, otaethyl palladium porphyrin, octaphenyl palladium porphyrin, etc.
- the appropriate complex is selected based on the required emission color, device performance, and hostig compound.
- a binder such as a resin and the above-described low molecular weight light emitting material are dissolved in a solvent to form a solution, which is then spun.
- the light emitting layer can also be formed by reducing the thickness by a coating method or the like.
- the light emitting layer may contain other known light emitting materials as desired, or a light emitting layer containing other known light emitting materials may be laminated. ,.
- a cathode having a work function (usually 4 eV or less) metal, alloy, electrically conductive compound, or a mixture thereof is used as the cathode of the organic EL device of the present invention.
- a work function usually 4 eV or less
- electrode materials include sodium, sodium-potassium alloy, magnesium, lithium, magnesium'silver alloy, aluminum / aluminum oxide, aluminum'lithium alloy, indium, rare earth metal, and the like.
- the cathode can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering.
- a method such as vapor deposition or sputtering.
- the transmittance of the cathode for light emission is greater than 10%.
- the sheet resistance as the cathode is preferably several hundred ⁇ or less, and the preferred film thickness is usually 10 nm to l x m, preferably 50 to 2 OOnm.
- an organic EL element is manufactured on a light-transmitting substrate.
- the translucent substrate is a substrate that supports the organic EL element, and is preferably a smooth substrate having a light transmittance in the visible region of 400 to 700 nm of 50% or more.
- a glass plate, a polymer plate, etc. are mentioned.
- the glass plate include soda lime glass, glass containing strontium, lead glass, aluminosilicate glass, borosilicate glass, borosilicate glass, and quartz.
- the polymer plate include polycarbonate, acrylic, polyethylene terephthalate, polyethersulfide, and polysulfone.
- an organic semiconductor layer In the organic EL device of the present invention, an organic semiconductor layer, an electron injection layer, an insulating layer, and the like may be formed as necessary.
- the organic semiconductor layer is formed between the anode and the light emitting layer, a layer for helping the injection of holes or electrons into the emitting layer, is preferably one having a conductivity of more than 10_ 1Q S / cm.
- Examples of the material for such an organic semiconductor layer include thiophene oligomers, conductive oligomers such as allylamin oligomers disclosed in JP-A-8-193191, and conductive materials such as arylamine amine dendrimers. Sex dendrimers and the like can be used.
- the electron injection layer is a layer that assists the injection of electrons into the light emitting layer, and has a high electron mobility
- the adhesion improving layer is a material that has particularly good adhesion to the cathode among the electron injection layers. It is a layer made up of.
- As a material used for the electron injection layer 8-hydroxyquinoline and its derivative, a metal complex, oxadiazole derivative are preferable.
- metal complex of 8-hydroxyquinoline or a derivative thereof include metal chelate oxinoid compounds containing a chelate of oxine (generally 8-quinolinol or 8-hydroxyquinoline).
- metal chelate oxinoid compounds containing a chelate of oxine generally 8-quinolinol or 8-hydroxyquinoline.
- tris (8-quinolinol) aluminum (Alq) can be used for the electron injection layer.
- examples of the oxadiazole derivative include an electron transfer compound represented by the following formula.
- Ar 1 ′, Ar 2 ′, Ar 3 ′, Ar 5 ′, Ar 6 ′, Ar 9 ′ each represents a substituted or unsubstituted aryl group, and each is the same or different from each other.
- Ar 4 ′, Ar 7 ′, Ar 8 ′ are substituted or unsubstituted arylene groups, which may be the same or different.
- the aryl group includes a phenyl group, a biphenyl group, an anthranyl group, a perylenyl group, a pyrenyl group, and the like.
- the arylene group include a phenylene group, a naphthylene group, a biphenylene group, an anthranylene group, a peryleneylene group, and a pyrenylene group.
- examples of the substituent include an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, and a cyan group.
- This electron transfer compound is preferably a thin film-forming compound.
- electron transfer compound include the following.
- Me represents a methyl group
- Bu represents a butyl group
- a preferred form of the organic EL device of the present invention is a device containing a reducing dopant in an electron transporting region or an interface region between the cathode and the organic layer.
- the reducing dopant is defined as a substance capable of reducing the electron transporting compound. Accordingly, various materials can be used as long as they have a certain reducibility, such as alkali metals, alkaline earth metals, rare earth metals, alkali metal oxides, alkali metal halides, alkaline earth metals.
- preferable reducing dopants include Na (work function: 2.36 eV), K (work function: 2.28 eV), Rb (work function: 2.16 eV) and Cs (work Function: 1. 95 eV) Force At least one alkali metal selected from the group consisting of Ca (work function: 2.9 eV), Sr (work function: 2.0 to 2.5 eV) and Ba (work function: 2 52eV) at least one alkaline earth metal selected from the group that also has a force, with a work function of 2.9 eV or less being particularly preferred.
- a more preferred reducing dopant is at least one alkali metal selected from the group consisting of K, Rb and Cs, more preferably Rb or Cs, most preferably Cs.
- alkali metals can improve emission brightness and extend the life of organic EL devices by adding a relatively small amount to the electron injection region, which has a particularly high reducing ability.
- a reducing dopant having a work function of 2.9 eV or less a combination of these two or more alkali metals is also preferred. Particularly, combinations containing Cs, for example, Cs and Na, Cs and K, Cs and A combination of Rb or Cs, Na and ⁇ is preferred. By including Cs in combination, the reduction ability can be efficiently demonstrated, and by adding to the electron injection region, the luminance of the organic EL element can be improved and the lifetime can be extended.
- the organic EL device of the present invention it is possible to effectively prevent leakage of current, which can be effectively provided with an electron injection layer composed of an insulator or a semiconductor between the cathode and the organic layer, thereby improving the electron injection property. Can be improved.
- an insulator it is preferable to use at least one metal compound selected from the group consisting of alkali metal chalcogenides, alkaline earth metal chalcogenides, alkali metal halides and alkaline earth metal halides. . Electron injection layer force S It is preferable that the material is composed of these alkali metal chalcogenides and the like because the electron injection property can be further improved.
- preferable alkali metal chalcogenides include, for example, LiO, LiO, Na S, Na Se and NaO.
- potash earth metal chalcogenide examples include CaO, BaO, SrO, BeO, BaS, and CaSe.
- preferable alkali metal halides include, for example, LiF, NaF, KF, LiCl, KC1, and NaCl.
- Preferred alkaline earth metal halides include fluorides such as CaF, BaF, SrF, MgF, and BeF.
- the semiconductor Ba, Ca, Sr, Yb, Al, Ga, In, Li, Na, Cd, Mg, Si, Ta,
- the inorganic compound constituting the electron transport layer is preferably a microcrystalline or amorphous insulating thin film. If the electron transport layer is composed of these insulating thin films, a more uniform thin film is formed. Pixel defects such as spots can be reduced. Examples of such inorganic compounds include the aforementioned alkali metal chalcogenides, alkaline earth metal chalcogenides, alkali metal halides, and alkaline earth metal halides.
- an insulating layer is formed in order to prevent pixel defects due to leakage or short-circuiting in order to apply an electric field to an ultrathin film. Specifically, it is preferable to insert an insulating thin film layer between a pair of electrodes.
- Examples of the material used for the insulating layer include aluminum oxide, lithium fluoride, lithium oxide, cesium fluoride, cesium oxide, magnesium oxide, magnesium fluoride, oxidizing power, subsequentlyium, calcium fluoride, aluminum nitride, titanium oxide, Examples thereof include silicon oxide, germanium oxide, silicon nitride, boron nitride, molybdenum oxide, ruthenium oxide, and vanadium oxide. Moreover, you may use these mixtures and laminates.
- each layer of the organic EL device of the present invention is not particularly limited, but in general, if the film thickness is too thin, defects such as pinholes occur, and conversely, if it is too thick, a high applied voltage is required and efficiency is increased. Usually, the range of several nm to 1 ⁇ is preferable.
- An organic EL device can be produced by forming an anode, a hole injection / transport layer, a light emitting layer, and an electron injection layer as required, and further forming a cathode by the materials and methods exemplified above. .
- the organic EL element can be fabricated in the reverse order to the cathode power anode.
- a glass substrate with a 25 mm ⁇ 75 mm ⁇ l. 1 mm thick IT ⁇ transparent electrode was ultrasonically cleaned in isopropyl alcohol for 5 minutes, followed by UV ozone cleaning for 30 minutes.
- a hole-injecting / transporting layer having a laminated structure was formed on this substrate.
- a film of polyethylene dioxythiophene * polystyrene sulfonic acid (PEDOT 'PSS) with a film thickness of lOOnm was formed by spin coating.
- a Tolenene solution (0.6 wt%) of Polymer 1 (Mw: 145000) shown below was formed into a film with a thickness of 20 nm by spin coating, and dried at 170 ° C. for 30 minutes.
- the film was formed by spin coating using a toluene solution containing 2 wt% of 2 (wt / wt)).
- the thickness of this light emitting layer was 50 nm.
- Alq film A tris (8-quinolinol) aluminum film (hereinafter abbreviated as “Alq film”) having a thickness of 10 nm was formed on the light emitting layer. This Alq film functions as an electron transport layer.
- Li Li source: manufactured by SAES Getter Co., Ltd.
- Alq Alq
- metal A1 was deposited to form a metal cathode, and an organic EL device was formed.
- This device emitted blue light, and the light emitting surface was uniform.
- the luminous efficiency at this time was 5.2 cd / A.
- the organic EL device of the present invention can be used for flat light emitters such as flat panel displays, copying machines, printers, backlights of liquid crystal displays or light sources such as instruments, display boards, indicator lamps, and the like.
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Abstract
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Cited By (8)
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- 2005-12-26 CN CNA2005800456812A patent/CN101094904A/zh active Pending
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US7547563B2 (en) | 2001-07-06 | 2009-06-16 | Semicondutor Energy Laboratory Co., Ltd. | Method of manufacturing a light emitting device |
US7378291B2 (en) | 2001-07-06 | 2008-05-27 | Semiconductor Energy Laboratory Co., Ltd. | Method of manufacturing a light emitting device |
US8752940B2 (en) | 2001-07-06 | 2014-06-17 | Semiconductor Energy Laboratory Co., Ltd. | Method of manufacturing a light emitting device |
US8425016B2 (en) | 2001-07-06 | 2013-04-23 | Semiconductor Energy Laboratory Co., Ltd. | Method of manufacturing a light emitting device |
US8197052B2 (en) | 2001-07-06 | 2012-06-12 | Semiconductor Energy Laboratory Co., Ltd. | Method of manufacturing a light emitting device |
WO2008105471A1 (ja) * | 2007-02-28 | 2008-09-04 | Idemitsu Kosan Co., Ltd. | 有機el材料含有溶液、有機el薄膜形成方法および有機el素子 |
US9290691B2 (en) * | 2007-02-28 | 2016-03-22 | Idemitsu Kosan Co., Ltd. | Organic el material-containing solution, method for forming organic el thin film, organic el device comprising organic el thin film, and method for manufacturing organic el display panel |
US20100117028A1 (en) * | 2007-02-28 | 2010-05-13 | Idemitsu Kosan Co., Ltd. | Organic el material-containing solution, method for forming organic el thiin film, organic el device comprising organic el thin film, and method for manufacturing organic el display panel |
EP2173141A4 (en) * | 2007-05-30 | 2011-09-21 | Sumitomo Chemical Co | ORGANIC ELECTROLUMINESCENT DEVICE AND DISPLAY DEVICE USING THE DEVICE |
EP2173141A1 (en) * | 2007-05-30 | 2010-04-07 | Sumitomo Chemical Company, Limited | Organic electroluminescent device and display using the device |
EP2166585A1 (en) * | 2007-07-07 | 2010-03-24 | Idemitsu Kosan Co., Ltd. | Organic electroluminescent device and material for organic electroluminescent device |
US8154195B2 (en) | 2007-07-07 | 2012-04-10 | Idemitsu Kosan Co., Ltd. | Organic electroluminescence device and material for organic electroluminescence device |
EP2166585A4 (en) * | 2007-07-07 | 2011-06-15 | Idemitsu Kosan Co | ORGANIC ELECTROLUMINESCENCE ELEMENT AND MATERIAL FOR AN ORGANIC ELECTROLUMINESCENCE ELEMENT |
US8211552B2 (en) | 2007-07-07 | 2012-07-03 | Idemitsu Kosan Co., Ltd. | Organic electroluminescence device |
EP2166586A4 (en) * | 2007-07-07 | 2011-06-15 | Idemitsu Kosan Co | ORGANIC ELECTROLUMINESCENCE DEVICE |
US8587192B2 (en) | 2007-07-07 | 2013-11-19 | Idemitsu Kosan Co., Ltd. | Organic electroluminescence device and material for organic electroluminescence device |
EP2166586A1 (en) * | 2007-07-07 | 2010-03-24 | Idemitsu Kosan Co., Ltd. | Organic electroluminescent device |
JP2010209248A (ja) * | 2009-03-11 | 2010-09-24 | Mitsubishi Chemicals Corp | 有機電界発光素子用組成物、有機電界発光素子、有機elディスプレイおよび有機el照明 |
Also Published As
Publication number | Publication date |
---|---|
TW200626702A (en) | 2006-08-01 |
EP1835006A1 (en) | 2007-09-19 |
CN101094904A (zh) | 2007-12-26 |
KR20070091318A (ko) | 2007-09-10 |
US20080124570A1 (en) | 2008-05-29 |
EP1835006A4 (en) | 2009-06-24 |
JP2006190759A (ja) | 2006-07-20 |
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