WO2004003105A1 - 燐光発光剤およびその製造方法、発光性組成物並びに有機エレクトロルミネッセンス素子およびその製造方法 - Google Patents
燐光発光剤およびその製造方法、発光性組成物並びに有機エレクトロルミネッセンス素子およびその製造方法 Download PDFInfo
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Definitions
- the present invention provides a phosphorescent agent which can be suitably used as a material for an organic electroluminescent device, a method for producing the same, a luminescent composition containing the phosphorescent agent, and a light-emitting layer containing the phosphorescent agent.
- the present invention relates to an organic electroluminescent element having the same and a method for manufacturing the same. Background technology
- the organic electroluminescent device can be thinned, can be driven by a DC power supply or an AC power supply, and has a wide viewing angle because it is a self-luminous element. It is expected to be a next-generation display device because of its excellent characteristics such as high display speed and high response speed, and its research is being actively conducted.
- Such an organic electroluminescent device has a single-layer structure in which a light emitting layer made of an organic material is formed between an anode and a cathode, and has a structure having a hole transport layer between the anode and the light emitting layer.
- a multilayer structure having an electron transport layer between a cathode and a light-emitting layer is known. All of these organic electroluminescence elements are composed of an electron injected from a cathode and an anode. Light is emitted by recombination with holes injected from the light emitting layer in the light emitting layer.
- an organic electroluminescence device as a method of forming an organic material layer such as a light emitting layer and a hole transport layer, a dry method of forming an organic material by vacuum deposition, or a method of applying a solution in which an organic material is dissolved is applied.
- a wet method of forming by drying is known.
- the process is complicated and it is difficult to cope with mass production, and there is a limit in forming a layer having a large area. You.
- the wet method the process is relatively simple and it is possible to cope with mass production. For example, by using an ink-jet method, a large-area organic material layer can be easily formed with high accuracy. In these respects, the wet method is more advantageous than the dry method.
- an organic material layer constituting an organic electroluminescence element is required to have a high emission luminance.
- various kinds of materials are known.
- An organic material layer containing an organic iridium compound or an organic osmium compound as a light-emitting molecule has been proposed (see International Publication No. 00/77065 Pamphlet).
- This organic material layer may be composed of only a low molecular organic iridium compound or an organic osmium compound, or a combination of these compounds and 4,4,1-N, N'-dicarbazolebiphenyl ⁇ 4,4,1- Bis [N _ (1 -naphthyl) 1 N-furuamino] Biphenyl and other hole transport materials.
- the present invention has been made in view of the above circumstances.
- the first object of the present invention is to enable a thin film to be easily formed by a wet method such as a printing method or an ink jet method, and
- Another object of the present invention is to provide a phosphorescent agent from which an organic electroluminescent device having high emission luminance can be obtained.
- a second object of the present invention is to provide a method by which the above-mentioned phosphorescent agent can be advantageously produced.
- a third object of the present invention is to provide a luminescent composition which can easily form a thin film, has a high luminous luminance, and can provide an organic-selective luminescent device.
- a fourth object of the present invention is to provide an organic electroluminescent device having a light emitting layer which has a light emitting layer which can be easily formed by a wet method such as a printing method and an ink jet method, and has a high light emission luminance.
- a fifth object of the present invention is to provide a method capable of easily forming a light emitting layer by a wet method such as a printing method or an ink jet method and producing an organic electroluminescent element having a high light emission luminance. Is to provide.
- the phosphorescent agent of the present invention is characterized by comprising a polymer compound containing a structural unit represented by the following general formula (1) in a molecule.
- General formula (1) a polymer compound containing a structural unit represented by the following general formula (1) in a molecule.
- M is a divalent to tetravalent metal atom
- R 1 and R 2 are each selected from a hydrogen atom, a halogen atom, or an alkyl group, a cycloalkyl group, an aryl group, and a heterocyclic group.
- R ′ and R 2 may be the same or different.
- X 1 represents a phenylene group or a carbonyloxy group
- X 2 represents an alkylene group.
- L represents an organic ligand.
- p is an integer of 1 to 3, and q is 0 or 1.
- the polymer compound preferably contains a structural unit derived from a hole transporting monomer in the molecule thereof.
- a structural unit derived from an electron transporting monomer Preferably contains a structural unit derived from an electron transporting monomer.
- the hole-transporting monomer is a force rubazole compound having a Bier group, and that the hole-transporting monomer is a force rubazole compound having a vinyl group.
- the electron transporting monomer is preferably an oxaziazole compound having a vial group.
- the method for producing a phosphorescent agent of the present invention comprises reacting a polymer containing a structural unit represented by the following general formula (2) in a molecule with an organometallic complex to obtain the above-mentioned general formula (1) Characterized by comprising a step of synthesizing a polymer compound containing a structural unit represented by in a molecule.
- General formula (2)
- R 1 and R 2 represents a hydrogen atom, a halogen atom or an alkyl group, a cycloalkyl group, a monovalent organic group selected from Ariru group Contact Yopi heterocyclic group, R 1 And R 2 may be the same or different.
- X ′ represents a phenylene group or a carbonyldioxy group, X 2 represents an alkylene group, and q is 0 or 1.
- the luminescent composition of the present invention is characterized in that the above-mentioned phosphorescent agent is dissolved in an organic solvent.
- the organic electroluminescent device of the present invention is characterized by comprising a light emitting layer containing the above-mentioned phosphorescent agent.
- the above-mentioned luminescent composition is applied to the surface of a substrate on which a luminescent layer is to be formed, and the obtained coating film is subjected to an organic solvent removal treatment. Characterized by having a step of forming a light emitting layer BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is an explanatory cross-sectional view showing a configuration of an example of an organic electroluminescence device having a light-emitting layer formed of a light-emitting composition of the present invention.
- FIG. 2 is an explanatory cross-sectional view showing the configuration of another example of an organic electroluminescent device having a light-emitting layer formed of the light-emitting composition of the present invention.
- the phosphorescent agent of the present invention comprises a polymer compound containing a structural unit represented by the above general formula (1) in a molecule (hereinafter, referred to as a “specific polymer compound”).
- the specific polymer compound may be composed of only the structural unit represented by the general formula (1) or may have other structural units. Is the structural unit represented by the general formula (1), whether it is at the terminal in the molecule or in the main chain, whether it is at the terminal or in the main chain. There may be.
- M is a divalent to tetravalent metal atom.
- the genus atom is preferably a transition metal atom from Groups 7 to 10 of the periodic table, and specific examples thereof include Pd, Pt, Rh, Ir, Ru, Os, and Re. Is mentioned. Among these, Ir, Os, and Pt are preferable in terms of a large work function.
- R 'and R 2 are a hydrogen atom, a halogen atom or an alkyl group, a monovalent organic group selected from Ariru group and heterocyclic group, R' and R 2 are also different from a same to be of the It may be.
- halogen atom examples include a chlorine atom and a fluorine atom.
- the alkyl group and the cycloalkyl group preferably have 1 to 12 carbon atoms.
- Specific examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a t-butyl group, a hexyl group, an octyl group, and a dodecyl group. These may have a side chain.
- the aryl group and the heterocyclic group preferably have 4 to 14 carbon atoms.
- Specific examples of the aryl group include a phenyl group, a naphthyl group, an anthracenyl group and a biphenyl group.
- Specific examples of the heterocyclic group include a chloro group, a pyrrolyl group, a furyl group, a pyridyl group, a pyrimidinyl group, a triazinyl group, an oxazolyl group, an oxdiazolyl group, a tetrahydrofuryl group, and a tetrahydrothiofuryl group. it can.
- X 1 is a phenylene group or an oxycarbonyl group
- X 2 is an alkylene group
- the anorealkylene group preferably has 1 to 8 carbon atoms.
- L is an organic ligand, and this organic ligand is formed by an organic compound having a coordination property with respect to a metal atom which is M in the general formula (1).
- the number p of the organic ligand is an integer of 1 to 3, and is selected in consideration of the valence of the metal atom used, the stable coordination number of the neutral complex by the metal atom, and the like. Specifically, the number p of the organic ligands is selected so that the number of outermost electrons in the metal atom is 16 or 18.
- organic compound forming the organic ligand examples include neutral monodentate organic ligands such as trialkylamine, triarylamine, pyridine, quinoline, oxazole, triarylquinolephosphine, and triarylphosphine.
- Organic compound Organic compounds that become monodentate organic ligands such as alkoxides such as methoxide, t-butoxide, and phenoxide; carboxylate such as acetate and trifluoroacetate; acetylaceton; hexafluoroacetylacetone; —Diketones such as dimethyl-2,4-hexadione; diamines such as ethylenediamine and dipyridyl; organic compounds that become polydentate organic ligands such as 9-hydroxyquinoline, picolinic acid and salicylic acid; and the following general formula:
- the phenylbilysine compound represented by (3) is exemplified. These compounds can be used alone or in combination of two or more.
- R 3 ⁇ R 1 Q are each independently a hydrogen atom, a halogen atom or a monovalent organic group, of R 3 ⁇ R l °, 2 two groups adjacent to each other It may combine to form a ring structure.
- the] -diketones and the fuel pyridine compound represented by the above general formula (3) are preferable in that they can easily form a chelate.
- phenylpyridine compound represented by the general formula (3) 2-phenylene 2-N-pyridine, 2-biphenylpyridine, 2- (4- (2,6-dimethylphenyl) phenyl) pyridine, 2-phenyl-2-41 (N, N-dimethinoleamino) pyridine, 2-phenyl 4-Pyrrolidinopyridine, 2-phenylenoyl 4- (N, N-diphenylamino) pyridine, 2-phenyl-4-methylpyridine, 2-phenyl-1,4-dimethylpyridine, 2- (2-fluorophenyl Pyridine, 2—
- the specific polymer compound constituting the phosphorescent agent of the present invention is composed of the structural unit represented by the general formula (1) and another structural unit, as the other structural unit.
- the other structural unit Those having a structural unit derived from a hole transporting monomer, or those having both a structural unit derived from a hole transporting monomer and a structural unit derived from an electron transporting monomer are preferable.
- a phorbazole derivative As the hole transporting monomer, it is preferable to use a phorbazole derivative.
- a carbazole derivative include alkenyl compounds, (meth) acryl compounds, and styryl compounds having a substituted or unsubstituted carbazolyl group such as a carbazolyl group, an alkylcarbazolyl group or an arylcarbazolyl group. Saturated compounds can be used.
- ⁇ -vinyl carbazole ⁇ - ( ⁇ -vinylinolephenyl) carbazole, 3,6-dimethyl-1-9-vinyl canole / solanol, 3,6-methinole nin-vinylinolecarbazo-1 And 3-methyl-9-vinylcarbazole, 3-ethyl-9-vinylcarbazole, and the like.
- the electron transporting monomer it is preferable to use an oxadiazole derivative.
- Examples of powerful oxadiazole derivatives include alkenyl compounds, (meth) acrylinole compounds, and styryl compounds having a substituted or unsubstituted oxadiazolyl group such as an oxadiazolyl group, an alkyloxadiazolyl group, or an aryloxdiazolyl group.
- Q 3-unsaturated compounds can be used.
- the proportion of the structural unit represented by the general formula (1) in the specific polymer compound constituting the phosphorescent agent of the present invention is preferably 0.1 mol% or more, more preferably 1 mol% or more of all the structural units. Mol% or more. If this ratio is too small, both the luminous brightness and the luminous efficiency may be low.
- the specific polymer compound constituting the phosphorescent agent of the present invention has a weight-average molecular weight in terms of polystyrene of 500 to 1.0, as measured by gel permeation chromatography (hereinafter abbreviated as “GPC”). It is preferably 0000, more preferably 50,000 to 500,000. If the weight-average molecular weight is less than 50,000 or more than 1,000, 0000, the coating property of the luminescent composition described below decreases, which is not preferable.
- the specific polymer compound constituting the phosphorescent agent of the present invention includes a polymer having a structural unit represented by the general formula (2) (hereinafter, referred to as a “specific precursor polymer compound”), and an organic metal. It is obtained by reacting with a complex.
- the specific precursor polymer compound is a monomer component containing a compound represented by the following general formula (4), specifically, a monomer component consisting of only a compound represented by the following general formula (4);
- a monomer component comprising the compound represented by the general formula (4) and the aforementioned carbazole derivative, or a monomer comprising the compound represented by the following general formula (4), the aforementioned carbazole derivative and the aforementioned oxaziazole derivative It is obtained by subjecting a body component to a polymerization treatment.
- R 1 and R 2 are a hydrogen atom, a halogen atom or an alkyl group, consequent opening alkyl group, a monovalent organic group selected from Ariru group and heterocyclic group, R 1 and R 2 may be the same or different.
- X 1 represents a phenylene group or a carbonyldioxy group, X 2 represents an alkylene group, and q is 0 or 1.
- —Preferred specific examples of the compound represented by the general formula (4) include 3- (p-vinylphenylmethylene) -pentane-1,2,4-dione and 3-1 () represented by the following formula (4-1). (Vinylcarbonyloxy) -pentane-1,4-dione; and compounds represented by the following formulas (4-2) to (4-1-4). Equation (4_1) Equation (4-1-2)
- a known polymerization method for example, a radical polymerization method, a cationic polymerization method, an anion polymerization method, or a limbing polymerization method thereof can be used.
- a radical polymerization catalyst is used.
- Catalysts such as azobisisobutyronitrile, azobis-1-1-acetoxy-111-phenylethane, peroxides, and 4-methylsulfonyloxy-2,2,2,6,6'-tetramethyl-1-piperidine-1N Combination with N-oxy radicals such as —oxide, 3,3,5,5-tetramethyl-l-pyrroline-l-N-oxide, 4-oxo-l, 2,2,, 6,6'-tetramethyl-l-piperidine-l-N-oxide And a sulfide-based catalyst can be used, and the use ratio is 0.0001 to 0.5 mol per 1 mol of all monomers.
- polymerization solvent examples include amide solvents such as dimethylformamide, dimethylacetamide, N-methylpyrrolidone, benzene, toluene, xylene, and hexane.
- Hydrocarbon solvents such as sun and cyclohexane, esters such as "y-petit mouth ratatone and ethyl lactate, and ketone solvents such as cyclohexylbenzophenone and cyclohexanone can be used.
- the reaction temperature is, for example, 60 to 200 ° C.
- HI—Zn I 2 , I 2 , I 2 —HI and the like can be used as the cationic polymerization catalyst, and in addition, a metal halide complex such as a metal halide ether complex can be used.
- a catalyst comprising a combination of a Lewis acid and a base can also be used. The use ratio is 0.0001 to 0.5 monol per 1 mol of all monomers.
- polymerization solvent examples include halogenated hydrocarbons represented by methylene chloride and benzene, ether solvents such as dibutyl ether, diphenyl ether, dioxane, and tetrahydrofuran; and highly polar solvents such as acetonitrile and nitrobenzene. Can be used.
- the reaction temperature is, for example, 150 to 50 ° C.
- an alkali metal compound such as naphthalene potassium or alkyl lithium, or an alkaline earth metal compound such as an artate complex of barium and aluminum can be used.
- the use ratio is 0.001 to 0.5 mol per 1 mol of all monomers.
- polymerization solvent examples include aromatic hydrocarbons such as toluene and benzene, aliphatic hydrocarbons such as hexane and heptane, and ethereal compounds such as tetrahydrofuran.
- the reaction temperature is, for example, 0 to 10 ° C.
- the specific precursor polymer compound When the specific precursor polymer compound has a structural unit represented by the above general formula (2) and another structural unit, it may be a random copolymer or a block copolymer.
- a block copolymer a polymer composed of the structural unit represented by the above general formula (2) and a polymer composed of other structural units are prepared in advance. It can also be produced by combining polymers
- a compound represented by the following general formula (5) is preferably used as an organometallic complex for obtaining a specific polymer compound.
- M is a divalent to tetravalent metal atom
- L is an organic ligand
- Q is a ligand formed by a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group or a carboxyl compound. Is shown.
- X is an integer from 1 to 4.
- M indicating a divalent to tetravalent metal atom and L indicating an organic ligand correspond to M and L in the general formula (1).
- specific examples of the carbonyl compound include acetylaceton.
- M in the general formula (5) are Ir, ⁇ s, and Pt, and preferred as L is a phenylpyridine compound represented by the general formula (3), and preferred as Q Is a halogen atom such as a chlorine atom.
- Specific examples of the compound represented by the general formula (5) include Clos bis (2-phenylpyridine) iridium or a dimer thereof, Clos bis (2- ⁇ p- (2,6-xylyl) phenyl) -Pyridine) iridium or its dimer, bis-bis (2- (2,4-difluoro) pheninole _ 4-methylpyridine) iridium or its dimer, bis-bis (2-furquinoline) iridium or Its dimer, chlorobis (2-phenyrubyridine) osmium or its dimer, its clos bis (2- ⁇ p- (2,6-xylyl) phenyl ⁇ pyridine) osmium or its dimer, Clos bis (2- (2,4-difluoro) phenyl-4-methylpyridine) osmium or its dimer, Clos bis (2-phenylquinoline) osmium or its dimer, Clos bis (2-phenyl
- M is Ir
- L is an organic ligand composed of the phenylpyridine compound represented by the general formula (3)
- Q is a chlorine atom.
- X is 2, y is 4, and z is 2.
- the iridium trichloride is reacted with the fuel pyridine compound represented by the general formula (3) in an appropriate reaction solvent. Obtained by:
- a polar solvent such as glycerin, an ethylene dalicol derivative and a propylene glycol derivative, or a mixture of these polar solvents and water can be used.
- ethylene glycol ethylene glycol monomethine And ethylene glycol monobutoxy ether, and ethylene glycol monobutoxy ether.
- the proportion of the reaction solvent used is usually 100 to 1000 parts by weight based on 100 parts by weight of the total of iridium trichloride and the phenylpyridine compound represented by the general formula (3).
- the use ratio of iridium trichloride to the pyridine compound represented by the general formula (3) is preferably 1: 2 to 1:10 in molar ratio.
- the reaction temperature is, for example, 30 to 200 ° C., and the reaction time is 2 to 48 hours.
- the reaction between the specific precursor polymer compound and the organometallic complex is preferably performed in an appropriate organic solvent under an inert gas atmosphere.
- the inert I 1 raw gas it is possible to use argon gas, nitrogen gas or the like.
- the organic solvent an organic compound having a boiling point at atmospheric pressure of 50 to 300 ° C. is preferably used, and specific examples thereof include tetrahydrofuran, dioxane, dimethylformamide, tonoleene, and ethylene. Glycol monoethyl ether and the like can be mentioned.
- the reaction conditions include a reaction temperature of, for example, 0 to 300 ° C. and a reaction time of, for example, 1 to 48 hours.
- the ratio of the specific precursor polymer compound and the organometallic complex to be used is preferably 0.1 to L: 100 parts by weight of the organometallic complex per 100 parts by weight of the specific precursor polymer compound. . If the proportion of the organometallic complex is too small, The efficiency of the reaction between the compound and the organometallic complex may decrease. On the other hand, if the proportion of the organometallic complex is excessive, the uniformity of each component in the reaction system may decrease.
- the proportion of the organic solvent used is preferably such that the solid content concentration becomes 1 to 50% by weight. This ratio is 1 weight. /. If the ratio is less than the above, the efficiency of the polymerization of the specific precursor polymer and the reaction between the compound and the organometallic complex may decrease. On the other hand, if this proportion exceeds 50% by weight, solid contents are liable to precipitate, which is not preferable.
- the phosphorescent light-emitting agent thus obtained has a peak wavelength of phosphorescence in the range of, for example, 450 to 700 nm, and is therefore suitable as a material for a light-emitting layer in an organic electroluminescence device.
- the phosphorescent agent since the phosphorescent agent itself is formed of a polymer compound, a thin film can be easily formed by a wet method such as a printing method or an ink-jet method. As is clear from the above, it is possible to obtain an organic EL device having high emission luminance.
- the luminescent composition of the present invention is obtained by dissolving the above-mentioned phosphorescent agent in an organic solvent.
- organic solvents can be used as long as they can dissolve the phosphorescent agent to be used.
- organic solvents include butanol, octanol, ethylene glycolone, propylene glycolone, and ethylene glycolone.
- Alcohols such as methisolate ether, propylene glycol monoethyl ether, ethylene glycol monoethyl ether, propylene glycol monoethyl ether, ethylene glycol monobutyl ether, and propylene glycol monobutyl ether
- Aromatic hydrocarbons such as toluene, xylene, cyclohexylbenzene, mesitylene, etc., esters such as ethyl acetate, butyl acetate, ethyl lactate, ethoxypropylene glycol acetate, propylene glycol monomethyl acetate, ⁇ -butyrolactone, Amides such as dong, formamide, dimethylformamide, dimethylacetamide, ethylene glycol dimethyl ether And ethers such as diethylene glycol dimethyl ether, tetrahydrofuran, and 1,4-dioxane, and ketones such as cyclohexanone, methyl amyl ketone, and methinoleisobutyl ketone.
- aromatic hydrocarbons amides, ethers, and ketones are preferably used, and particularly preferred are ethyl lactate, propylene glycol monomethinoleate, propylene glycol monomethyl acetate. , Hexahexanone, cyclohexynolebenzene, mesitylene and the like.
- the proportion of the organic solvent to be used is appropriately selected depending on the kind of the phosphorescent agent or the like, and is usually a proportion at which the solid content concentration is 0.05 to 10% by weight.
- the luminescent composition of the present invention may contain, for example, a polymer compound having a hole transporting ability, in addition to the above-mentioned phosphorescent agent.
- a polymer compound having a strong hole transporting ability a copolymer of the above-described sorbazole derivative and the above-described oxadiazole derivative can be used.
- the luminescent layer in the organic electroluminescent device is applied by applying the luminescent layer to the surface of the substrate on which the luminescent layer is to be formed, and performing an organic solvent removal treatment on the obtained coating film. Can be formed.
- a spin coating method As a method for applying the luminescent composition, a spin coating method, a dive method, an oral coating method, an ink jet method, a printing method, or the like can be used.
- FIG. 1 is an explanatory cross-sectional view illustrating a configuration of an example of an organic electroluminescence device (hereinafter, also referred to as “organic EL device”) having a light-emitting layer formed by the light-emitting composition of the present invention.
- organic EL device organic electroluminescence device
- an anode layer 2 is provided on a transparent substrate 1, a hole transport layer 3 is provided on the anode layer 2, and a light emitting layer 5 is provided on the hole transport layer 3.
- An electron injection layer 6 is provided on the light emitting layer 5, and a cathode layer 7 is provided on the electron injection layer 6.
- the anode layer 2 and the cathode layer 7 are electrically connected to a DC power supply 8.
- the transparent substrate 1 is a glass substrate, a transparent resin A substrate, a quartz glass substrate, or the like can be used.
- the anode layer 2 is also referred to as a hole injection electrode layer.
- a material forming the anode layer 2 a material having a large work function, for example, 4 eV or more is preferably used.
- the work function is the minimum work required to extract electrons from a solid into a vacuum.
- an anode layer 2 for example, ITO (Indium Tin Oxide) film, a tin oxide (S N_ ⁇ 2) film, copper oxide (C u O) film may Rukoto using zinc oxide (Z n O) film or the like .
- a vacuum evaporation method, a sputtering method, or the like can be used as a method for forming the anode layer 2.
- a commercially available material in which, for example, an ITO film is formed on the surface of a transparent substrate such as a glass substrate can also be used.
- the hole transport layer 3 is also referred to as a hole injection layer, and is provided for efficiently supplying holes to the light emitting layer 5.
- the hole transport layer 3 receives holes from the anode layer 2 to generate holes. It has a function of transporting to the optical layer 5.
- an aromatic polymer As a material constituting the hole transport layer 3, it is preferable to use an aromatic polymer.
- polydioxythiophene and polystyrene sulfonic acid which are commercially available as PEDOT (trade name “Baytron” (manufactured by Bayer AG)).
- PEDOT trade name “Baytron” (manufactured by Bayer AG)
- Complex with Poly (3, 4)-ethylenedioxythiophene-polystyrenesulfonate j Other materials include 1,1-bis (4-di-p-aminophenyl) cyclohexane, triphenylamine derivatives, and carbazole derivatives. Etc. can also be used.
- Such a hole transport layer 3 is applied by a dry method such as a vacuum deposition method or the like, after dissolving a hole transport material in an appropriate solvent, and then applying the solution by a spin coating method, a dip method, an inkjet method, a printing method, or the like. And dried by a wet method.
- the thickness of the hole transport layer 3 is, for example, 10 to 200 nm.
- the light emitting layer 5 has a function of combining electrons and holes and emitting the bond energy as light.
- the light emitting layer 5 contains the phosphorescent agent of the present invention.
- the light emitting composition of the present invention is applied by a spin coating method, a dip method, an ink jet method, a printing method, or the like, and dried to form the light emitting layer 5. be able to.
- the thickness of the light emitting layer 5 is, for example, 1 to 200 nm.
- the electron injection layer 6 has a function of receiving electrons from the cathode layer 7 and transporting the electrons to the light emitting layer 5.
- a material constituting the electron injection layer 6 it is preferable to use a batho-Nant-phosphorus-based material (BPCs), and as other materials, lithium fluoride, magnesium fluoride, strontium oxide, A quinodimethane derivative, a diphenylquinone derivative, an oxadiazole derivative, a perylenetetracarboxylic acid derivative, or the like can also be used.
- BPCs batho-Nant-phosphorus-based material
- Such an electron injection layer 6 is formed by a dry method such as a vacuum evaporation method or the like, after dissolving an electron injection material in an appropriate solvent, and applying this solution by a spin coating method, a dipping method, an inkjet method, a printing method, or the like. It can be formed by a wet method of drying.
- the thickness of the electron injection layer 6 is, for example, 0.1 to 100 nm.
- the cathode layer 7 is also called an electron injection electrode layer, and a material having a small work function, for example, 4 eV or less is used as a material constituting the cathode layer 7.
- a metal film made of an anoremium, calcium, magnesium, indium, or the like, or an alloy film of these metals can be used.
- Such a cathode layer 7 can be formed by a vacuum evaporation method, a sputtering method, or the like.
- the light emitting layer 5 emits light. And radiated through the transparent substrate 1.
- the organic EL device having such a configuration, since the light-emitting layer 5 contains the phosphorescent agent of the present invention, a high light-emitting luminance is obtained, and the light-emitting composition of the present invention also has a high power. Thereby, the light emitting layer 5 can be easily formed by a wet method.
- a structure having a light-emitting function is distributed in the light-emitting agent on the order of molecules, and there is no self-dissipation due to association or the like. As well as excellent durability.
- the organic EL device using the luminescent composition of the present invention is not limited to the above configuration, Various changes can be made.
- a copper phthalocyanine layer 4 can be provided between the hole transport layer 3 and the light emitting layer 5.
- the copper phthalocyanine layer 4 By providing the copper phthalocyanine layer 4 between the hole transport layer 3 and the light emitting layer 5, the energy P between the hole transport layer 3 and the light emitting layer 5 is reduced. As a result, holes are more smoothly injected into the light emitting layer 5, and energy matching between the hole transport layer 3 and the light emitting layer 5 is facilitated. By providing such a copper phthalocyanine layer 4, an organic EL device having a long service life, high luminous efficiency, and excellent durability can be obtained.
- the copper phthalocyanine layer 4 is formed by a dry method such as a vacuum evaporation method or a sputtering method, or a wet method in which a solution containing copper phthalocyanine is applied by a spin coating method, a dip method, an inkjet method, a printing method, or the like, and dried. can do.
- the thickness of the copper phthalocyanine layer 4 is, for example, 0.5 to 50 nm.
- the power of explaining specific examples of the present invention The present invention is not limited to these.
- This product has 91 moles of structural units derived from N-vinylcarbazole. /. And 3 - (p-vinyl phenylalanine methylene) Single pentane one 2, a copolymer consisting of structural units 9 mole 0/0 derived from 4-dione, Gerupa one permeation chromatography Chillon chromatographic I over (GPC) The weight average molecular weight in terms of polystyrene measured by 00 H. This is designated as “precursor polymer compound (1)”. on
- step 1 0.466 g (1.44 mmol) of 2- (p-vinylphenyl) -5-biphenyl-1,3,4-oxadiazole was added as a monomer. A white to pale yellow powder was obtained in the same manner except for the following.
- the resulting product was composed of 80 mol% of structural units derived from N-vinylcarbazole, 8 mol% of structural units derived from 3- (p-vinylphenylmethylene) -pentane-2,4-dione and (P-Bielphenyl) — 5-cophenyl_1,3,4-copolymer consisting of 12 mol% of monooxadiazole,
- the weight average molecular weight in terms of polystyrene measured by Ge permeation chromatography (GPC) was 28,000. This is designated as “precursor polymer compound (3)”.
- GPC gel permeation chromatography
- the obtained polystyrene-equivalent weight average molecular weight was 13,000. This is referred to as “precursor polymer compound (5)”.
- Example 1 2.0 g of the precursor polymer compound (1), 0.15 g of the organometallic complex (1), 0.1 g of sodium carbonate and 50 milliliters of hydrated tetrahydrofuran were stirred at room temperature under a nitrogen stream for 1 hour. After that, the mixture was stirred at 80 ° C for 16 hours. Next, the reaction solution is cooled and purified by reprecipitation using methanol to give a structural unit represented by the following formula (a-1) and a structural unit represented by the following formula (a-2) (N-bi (Structural unit derived from nitrocarbazole). When the obtained specific polymer compound was dissolved in black-mouthed form, this solution showed a green phosphorescent spectrum. This specific polymer compound is referred to as “phosphorescent agent (1) J”.
- a luminescent composition was prepared by adding 5 parts by weight of this phosphorescent agent (1) to 95 parts by weight of cyclohexanone and mixing the mixture to form a melting angle. This is referred to as “luminescent composition (1)”. Equation (a— 1) Equation (a—
- PEDOT trade name: Baytron P8000, Bayer Corporation
- the above-described luminescent composition (1) is applied to the surface of the hole transport layer by a spin coater, and heated at 150 ° C. for 10 minutes to form a 55-nm thick luminescent layer. Was formed.
- an electron injection layer having a thickness of 25 nm was formed on the surface of the light emitting layer by vacuum vapor deposition of phosphorus phosphatide at a molar ratio of 1: 3.
- an aluminum film having a thickness of 100 nm was laminated on the surface of the electron injection layer, and then sealed with a glass material to produce an organic EL device.
- the organic EL device was caused to emit light by applying a DC voltage of 10 V using the as an anode layer and the anode layer as a cathode layer, and the emission color and emission luminance were examined. As a result, the emission color was green and the emission luminance was 25000 cd / m 2 .
- a solution consisting of 2.0 g of the precursor polymer compound (2), 0.2 g of the organometallic complex (2), 0.1 g of sodium carbonate and 50 milliliters of hydrous tetrahydrofuran was stirred at room temperature under a nitrogen stream for 1 hour. Thereafter, the mixture was stirred at 50 ° C. for 18 hours. Next, the reaction solution is cooled and reprecipitated and purified using methanol to obtain a structural unit represented by the following formula (b-1) and a structural unit represented by the following formula (b-2) (N-vinylkaline).
- a luminescent composition was prepared by adding and dissolving 5 parts by weight of this phosphorescent agent (2) to 95 parts by weight of cyclohexanone. This is referred to as “luminescent composition (2)”. Equation (b-1)
- An organic EL device was manufactured in the same manner as in Example 1 except that the luminescent composition (2) was used in place of the luminescent composition (1), and the emission color and the emission luminance were examined. As a result, the emission color was green and the emission luminance was 35000 cd / m 2 .
- a solution consisting of 2.0 g of the precursor polymer compound (3), 0.18 g of the organometallic complex (3), 0.1 g of sodium carbonate, and 50 milliliters of hydrated tetrahydrofuran was placed under a nitrogen stream at 50 ° C for 48 hours. Reacted.
- a luminescent composition was prepared by adding 5 parts by weight of this phosphorescent agent (3) to 95 parts by weight of cyclohexanone and dissolving the mixture. This is referred to as “luminescent composition (3)”. Equation (c-1 1) Equation (c-1 2)
- An organic EL device was manufactured in the same manner as in Example 1 except that the light-emitting composition (3) was used instead of the light-emitting 'I-raw composition (1), and the emission color and emission luminance were examined. .
- the emission color was blue and the emission luminance was 2000 cd / m 2 .
- a solution consisting of 2.0 g of the precursor polymer compound (4), 0.18 g of the organometallic complex (4), 0.1 g of sodium carbonate and 50 milliliters of hydrated tetrahydrofuran was heated at 80 ° C for 6 hours under a nitrogen stream. Stirred.
- a luminescent composition was prepared by adding and dissolving 5 parts by weight of this phosphorescent agent (4) to 95 parts by weight of cyclohexanone. This is referred to as “luminescent composition (4)”.
- An organic EL device was manufactured in the same manner as in Example 1 except that the luminescent composition (4) was used instead of the luminescent composition (1), and the luminescent color and luminescent brightness thereof were examined. As a result, the emission color was red and the emission luminance was 13000 cd / m 2 .
- Example 2 the precursor polymer (5) was used instead of the precursor polymer (2). )), And a structural unit represented by the following formula (e-1) and a structural unit represented by the following formula (e-2) (N- (p-vinylphenyl) Specific polymer consisting of a structural unit represented by the following formula (e-3) and a structural unit derived from 2-fuunyl-5- (p-bierphenyl) 1-1,3,4-oxadiazole The compound was obtained. When the obtained specific polymer compound was dissolved in clog form, this solution showed a green phosphorescence spectrum. This particular polymer compound is referred to as “phosphorescent agent (5)”.
- a luminescent composition was prepared by adding 5 parts by weight of this phosphorescent agent (5) to 95 parts by weight of cyclohexanone and dissolving the mixture. This is referred to as “luminescent composition (5)”. Equation (e-1) Equation (e-2)
- a comparative luminescent composition was prepared by dissolving 2 g of the precursor polymer compound (1) and 0.15 g of the organometallic complex (1) in 40 g of cyclohexanone.
- An organic EL device was manufactured in the same manner as in Example 1 except that the comparative luminescent composition was used instead of the luminescent composition (1), and the luminescent color and luminescent brightness were examined. As a result, the emission color was blue and the emission luminance was 50 cd / m 2 .
- the invention's effect was obtained by dissolving 2 g of the precursor polymer compound (1) and 0.15 g of the organometallic complex (1) in 40 g of cyclohexanone.
- An organic EL device was manufactured in the same manner as in Example 1 except that the comparative luminescent composition was used instead of the luminescent composition (1), and the luminescent color and luminescent brightness were examined. As a result, the emission color was blue and the emission luminance was 50 cd / m 2 .
- a thin film can be easily formed by a wet method such as a printing method or an ink-jet method, and an organic electroluminescent element having high emission luminance can be obtained.
- the above-mentioned phosphorescent agent can be advantageously produced.
- the luminescent composition of this invention According to the luminescent composition of this invention, a thin film can be formed easily, and moreover, the luminous brightness is high and an organic EL device is obtained.
- the organic electroluminescent device of the present invention has a light-emitting layer that can be easily formed by a wet method such as a printing method and an ink-jet method, and has a high light emission luminance.
- a light emitting layer can be easily formed by a wet method such as a printing method or an ink jet method. Can be manufactured
Description
Claims
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US10/508,943 US20050145830A1 (en) | 2003-06-26 | 2003-06-26 | Phosphors and process for production thereof, luminescent compositions, and organic electroluminescent devices and processes for production thereof |
KR10-2004-7016362A KR20050005443A (ko) | 2002-06-27 | 2003-06-26 | 인광 발광제 및 그의 제조 방법, 발광성 조성물 및 유기전계 발광 소자 및 그의 제조 방법 |
EP03736256A EP1516901A4 (en) | 2002-06-27 | 2003-06-26 | PHOSPHORES AND PROCESS FOR PRODUCING THESE PHOSPHORES, LUMINESCENT COMPOSITIONS, ORGANIC ELECTROLUMINESCENT DEVICES, AND METHODS FOR PRODUCING THE SAME |
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JP2002187719A JP2004027088A (ja) | 2002-06-27 | 2002-06-27 | 燐光発光剤およびその製造方法並びに発光性組成物 |
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JP (1) | JP2004027088A (ja) |
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Cited By (6)
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WO2010149259A2 (en) | 2009-06-22 | 2010-12-29 | Merck Patent Gmbh | Conducting formulation |
WO2011076324A1 (en) | 2009-12-23 | 2011-06-30 | Merck Patent Gmbh | Compositions comprising organic semiconducting compounds |
WO2011128035A1 (en) | 2010-04-12 | 2011-10-20 | Merck Patent Gmbh | Composition and method for preparation of organic electronic devices |
WO2011147523A1 (en) | 2010-05-27 | 2011-12-01 | Merck Patent Gmbh | Formulation and method for preparation of organic electronic devices |
JP2012149083A (ja) * | 2004-07-07 | 2012-08-09 | Universal Display Corp | 安定で効率的なエレクトロルミネッセンス材料 |
US9203044B2 (en) | 2011-02-16 | 2015-12-01 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting body, light-emitting layer, and light-emitting device |
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GB0219253D0 (en) * | 2002-08-19 | 2002-09-25 | Elam T Ltd | Electroluminescent materials and device |
WO2006135076A1 (en) | 2005-06-14 | 2006-12-21 | Showa Denko K.K. | Light emitting polymer material, organic electroluminescence device and display device comprising light emitting polymer material |
JP5031276B2 (ja) * | 2005-06-14 | 2012-09-19 | 昭和電工株式会社 | 高分子発光材料、ならびに高分子発光材料を用いた有機エレクトロルミネッセンス素子および表示装置 |
JP2007305734A (ja) * | 2006-05-10 | 2007-11-22 | Showa Denko Kk | 表示素子及びその製造方法 |
US7851579B2 (en) * | 2006-12-11 | 2010-12-14 | General Electric Company | Carbazolyl polymers for organic electronic devices |
DE102007044872A1 (de) * | 2007-09-20 | 2009-04-02 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Polymere Licht-emittierende Diode und Verfahren zu deren Herstellung |
TW201127934A (en) * | 2009-07-01 | 2011-08-16 | Georgia Tech Res Inst | Phosphorescent platinum complexes, their monomers and copolymers, and uses in organic electronic devices |
WO2011147522A1 (en) * | 2010-05-27 | 2011-12-01 | Merck Patent Gmbh | Compositions comprising quantum dots |
DE102010045369A1 (de) * | 2010-09-14 | 2012-03-15 | Merck Patent Gmbh | Materialien für organische Elektrolumineszenzvorrichtungen |
JP2012195572A (ja) | 2011-02-28 | 2012-10-11 | Semiconductor Energy Lab Co Ltd | 発光層および発光素子 |
EP2543685A1 (de) * | 2011-07-08 | 2013-01-09 | cynora GmbH | Verfahren zur kovalenten Bindung eines Metallkomplexes an ein Polymer |
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- 2003-06-27 TW TW092117712A patent/TW200404881A/zh unknown
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Cited By (6)
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JP2012149083A (ja) * | 2004-07-07 | 2012-08-09 | Universal Display Corp | 安定で効率的なエレクトロルミネッセンス材料 |
WO2010149259A2 (en) | 2009-06-22 | 2010-12-29 | Merck Patent Gmbh | Conducting formulation |
WO2011076324A1 (en) | 2009-12-23 | 2011-06-30 | Merck Patent Gmbh | Compositions comprising organic semiconducting compounds |
WO2011128035A1 (en) | 2010-04-12 | 2011-10-20 | Merck Patent Gmbh | Composition and method for preparation of organic electronic devices |
WO2011147523A1 (en) | 2010-05-27 | 2011-12-01 | Merck Patent Gmbh | Formulation and method for preparation of organic electronic devices |
US9203044B2 (en) | 2011-02-16 | 2015-12-01 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting body, light-emitting layer, and light-emitting device |
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EP1516901A1 (en) | 2005-03-23 |
KR20050005443A (ko) | 2005-01-13 |
EP1516901A4 (en) | 2009-04-08 |
TW200404881A (en) | 2004-04-01 |
JP2004027088A (ja) | 2004-01-29 |
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