WO2007043495A9 - 共重合体およびそれを用いた高分子発光素子 - Google Patents
共重合体およびそれを用いた高分子発光素子Info
- Publication number
- WO2007043495A9 WO2007043495A9 PCT/JP2006/320156 JP2006320156W WO2007043495A9 WO 2007043495 A9 WO2007043495 A9 WO 2007043495A9 JP 2006320156 W JP2006320156 W JP 2006320156W WO 2007043495 A9 WO2007043495 A9 WO 2007043495A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- group
- polymer
- layer
- light
- copolymer
- Prior art date
Links
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Definitions
- the present invention relates to a copolymer and a polymer light emitting device (polymer LED) using the copolymer.
- An object of the present invention is to provide a copolymer which is useful as a light-emitting material or a charge transport material and has excellent device characteristics such as a low light emission starting voltage.
- the present invention provides a copolymer comprising a repeating unit represented by the following formula (1) and a repeating unit represented by the following formula (2).
- a ring and B ring each independently represents an aromatic ring optionally having a substituent.
- R represents a substituent.
- R represents a substituent.
- Af represents an aryl group optionally having a substituent or a monovalent heterocyclic group optionally having a substituent, and among the atoms constituting the ring of Ar, In the formula, a substituent is not bonded to the atom adjacent to or positioned to the atom bonded to the nitrogen atom.
- R 2 represents a substituent, and n represents an integer of 0 to 3. When a plurality of R 2 are present, they may be the same or different.
- the copolymer of the present invention contains a repeating unit represented by the formula (1).
- the A ring and the B ring each independently represent an aromatic ring which may have a substituent, and examples of the aromatic ring include an aromatic hydrocarbon ring and an aromatic heterocyclic ring.
- aromatic hydrocarbon rings include aromatic hydrocarbon rings such as benzene ring, naphthalene ring, anthracene ring, tetracene ring, penyucene ring, pyrene ring, and phenanthrene ring.
- the ring include a thiophene ring and a pyridine ring.
- a benzene ring, a naphthenic ring, an anthracene ring, and a phenanthrene ring are preferable, and a benzene ring and a naphthalene ring are more preferable.
- R is an alkyl group, an alkoxy group, an alkylthio group, an aryl group, an aryl group, an aryl group, an aryl group, an aryl group, an aryl group, an aryl group, an aryl group, an amino group , Substituted amino group, silyl group, substituted silyl group, halogen atom, acyl group, acyloxy group, imine residue, amide group, acid imide group, monovalent heterocyclic group, carboxyl group, substituted carboxyl group, bicyclic group And those selected from cyan groups. Included in these substituents The hydrogen atom may be replaced with a fluorine atom.
- the alkyl group may be linear, branched or cyclic, and usually has about 1 to 20 carbon atoms, preferably 3 to 20 carbon atoms. Specific examples thereof include a methyl group and an ethyl group. , Propyl group, i-propyl group, n-butyl group, i-butyl group, t-butyl group, pentyl group, isoamyl group, hexyl group, cyclohexyl group, heptyl group, octyl group, 2-to-ethyl Xyl group, nonyl group, decyl group, 3,7-dimethyloctyl group, lauryl group, trifluoromethyl group, pentafluoroethyl group, perfluorobutyl group, perfluorohexyl group, perfluoro group From the viewpoint of solubility in organic solvents, device characteristics, ease of monomer synthesis, and heat resistance, pent
- the alkoxy group may be linear, branched or cyclic, and usually has about 1 to 20 carbon atoms, preferably 3 to 20 carbon atoms. Specific examples thereof include a methoxy group and an ethoxy group. , Propyloxy, i-propyloxy, butoxy, i-butoxy, t-butoxy, pentyloxy, hexyloxy, cyclohexyloxy, heptyloxy, octyloxy, 2-ethylhexyloxy, nonyloxy Group, decyloxy group, 3,7-dimethyloctyloxy group, lauryloxy group, trifluoromethoxy group, penafluorofluoroethoxy group, perfluorobutoxy group, perfluorinated hexyl group, perfluorooctyl Group, methoxymethyloxy group, 2-methoxyethyloxy group, etc., solubility in organic solvents From the viewpoint of heat resistance
- the alkylthio group may be linear, branched or cyclic, and usually has about 1 to 20 carbon atoms, preferably 3 to 20 carbon atoms. Specific examples thereof include a methylthio group, an ethylthio group, and a propylthio group.
- the aryl group is an atomic group obtained by removing one hydrogen atom from an aromatic hydrocarbon, having a condensed ring, two or more independent benzene rings or condensed rings bonded directly or through a group such as vinylene. Also included.
- the aryl group usually has about 6 to 60 carbon atoms, preferably '7 to 48.
- phenyl groups C, to Ci 2 alkoxyphenyl groups (C, to C I 2 are carbon The same applies to the following:), C, ⁇ C I 2 alkylphenyl group, 1-naphthyl group 2-naphthyl group, 1-anthracenyl group, 2-anthracenyl group, 9 anthracenyl group, such as a pen evening fluorophenyl group and the like, solubility in organic solvents, from the viewpoint of easiness in element characteristics, a monomer of the synthesis, ⁇ , C 12 alkoxy-phenylalanine group, C, ⁇ .C alkylphenyl group Shi favored ⁇ C, specifically as -C 12 7 alkoxy, main Bok alkoxy, Kishiruokishi ethoxy, Puropiruokishi, i- Puropiruoki shea, butoxy, i- butoxy, t-butoxy, Penchiruokishi to
- alkylphenyl groups they are methylphenyl, ethylphenyl, dimethylphenyl, propylphenyl, mesityl, methylethylphenyl, i-propylphenyl, butylphenyl, i-butylphenyl, Examples include t-butylphenyl group, pentylphenyl group, isoamylphenyl group, hexylphenyl group, heptylphenyl group, octylphenyl group, nonylphenyl group, decylphenyl group, dodecylphenyl group and the like.
- the aryloxy group usually has about 6 to 60 carbon atoms, preferably 7 to 48. Specific examples thereof include a phenoxy group, a C, to C 1 2 alkoxyphenoxy group, and a C, to C, 2 alkylphenoxy group.
- C, ⁇ C I 2 alkoxy include methoxy, ethoxy, propyloxy, i-propyloxy, butoxy, i-butoxy, t-butoxy, pentyloxy, hexyloxy, cyclohexyloxy, heptyloxy, octyloxy, 2 —Ethylhexyloxy, nonyloxy, decyloxy, 3,7-dimethyloctyloxy, lauryloxy and the like are exemplified.
- C, ⁇ C, 2 alkylphenoxy groups include methylphenoxy group, ethylphenoxy group, dimethylphenoxy group, propylphenoxy group, 1,3,5-trimethylphenoxy group, methylethyl Phenoxy group, i-propyl phenoxy group, butyl phenoxy group, i-butyl phenoxy group, tert-butyl phenoxy group, pentyl phenoxy group, isoamyl phenoxy group, hexyl phenoxy group, heptyl phenoxy group, octyl phenoxy group, Examples include a sonylphenoxy group, a decylphenoxy group, and a dodecylphenoxy group.
- Ariruchio group has a carbon number of usually about 3 to 60, and specific examples thereof include phenylene group, a heteroarylthio group, C, -C I2 Arukokishifue two thio groups, C, -C Arukirufue two thio group, a 1-naphthylthio group , 2-naphthylthio group, pendefluorofluorothio group and the like. From the viewpoints of solubility in organic solvents, device characteristics, ease of monomer synthesis, etc., C, ⁇ C, 2 alkoxyphenylthio The group C, ⁇ C, 2 alkylphenylthio is preferred.
- the arylalkyl group usually has about 7 to 60 carbon atoms, preferably 7 to 48, and specific examples thereof include phenyl— ⁇ ⁇
- 2 alkyl groups are preferred.
- aryl alkoxy groups usually carbon About 60, preferably 7 to 48 carbon atoms. Specific examples thereof include a phenylmethoxy group, a phenylethoxy group, and a phenylbutene. Phenyl, C, ⁇ C I 2 alkoxy groups, C, ⁇ C, ' 2 alkoxyphenyl, such as xy group, phenyl pentyloxy S, phenyl hexyloxy group, phenyl heptoxy group, phenyloctyloxy group, etc.
- the arylalkyl group usually has about 7 to 60 carbon atoms, preferably 7 to 48 carbon atoms. Specific examples thereof include phenyl-C, -C, 2 alkylthio groups, and alkoxyphene. Illustrative examples include two- roof C, ⁇ C I 2 alkylthio groups, ⁇ ⁇ dialkylthiol--dialkylthio groups, 1-naphthyl- 2- alkylthio groups, 2-naphthyl-C, ⁇ 'C I 2 7 alkylthio groups, organic solubility in solvents, device properties, from the viewpoint of easiness of monomer synthesis, C, -C 12 alkoxy phenylalanine - ⁇ ⁇ . , 2 alkylthio groups, C 1, ⁇ C, 2 alkylphenol C, ⁇ C, 2 alkylthio groups are preferred.
- the aryl alkenyl group usually has about 860 carbon atoms, specifically, a phenyl C 2 -C I 2 alkenyl group,.
- Arukokishifue two Lou C 2 -C I 2 alkenyl groups, C, -C 12 alkylphenyl - C 2 ⁇ C I 2 alkenyl group, 1-Nafuchiru C 2 ⁇ C, 2 alkenyl groups, 2-naphthyl - C 2 -C, 2 alkenyl groups and the like are exemplified.
- C, -C I 2 alkoxyphenyl-C 2 -C 12 alkenyl groups C 2 -C I 2 alkylphenyl-C, -C 12 alkenyl group is preferred.
- the aryl alkynyl group usually has about 8 to 60 carbon atoms. Specific examples thereof include phenyl C 2 -C, 2 alkynyl groups, C, -C, 2 alkoxy phenyl C 2 -C, 2 alkynyl group, ⁇ 12 Aruki irreiru - Ji 2 ⁇ .
- substituted amino group examples include an alkyl group, an aryl group, an aryl group, an arylalkyl group or an amino group substituted with one or two groups selected from a monovalent heterocyclic group.
- the group, arylalkyl group or monovalent heterocyclic group may have a substituent.
- the carbon number of the substituted amino group is usually about 1 to 60, preferably 2 to 48, not including the carbon number of the substituent.
- Pentylamino group, hexylamino group Pentylamino group, hexylamino group,.
- Examples of the substituted silyl group include silyl groups substituted with 1, 2 or 3 groups selected from an alkyl group, aryl group, aryl alkyl group or monovalent heterocyclic group.
- the substituted silyl group usually has about 1 to 60 carbon atoms, preferably 3 to 48 carbon atoms.
- the alkyl group, aryl group, aryl alkyl group or monovalent heterocyclic group may have a substituent.
- trimethylsilyl group triethylsilyl group, triprovirsilyl group, Li i monopropyl silyl group, ditylui i -propyl silyl group, jetyl i monopropylsilyl group, t-butyldimethylsilyl group, pentyldimethylsilyl group, hexyldimethylsilyl group, heptyldimethylsilyl group, octyldimethylsilyl group, 2 —Ethylhexyl-dimethylsilyl group, nonyldimethylsilyl group, decyldimethylsilyl group, 3,7-dimethyloctylmonodimethylsilyl group, lauryl.dimethylsilyl group, phenyl-C 1 , ⁇ C 1 2 alkylsilyl group, C 1, ⁇ C I 2 alkoxyphenyl — C 1, ⁇ C I
- halogen atom examples include: a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- the acyl group usually has about 2 to 20 carbon atoms, preferably 2 to 18 carbon atoms.
- examples of the acetyl group include a acetyl group, propionyl group, propylyl group, isoptylyl group, valolyl group, benzoyl group, trifluoroacetyl group, and pendefluorofluorobenzoyl group.
- the acyloxy group usually has about 2 to 20 carbon atoms, preferably 2 to 18 carbon atoms. Specific examples thereof include an acetoxy group, a propionyloxy group, a petityloxy group, an isoptiyloxy group, a bivalyloxy group. A benzoyloxy group, a trifluoroacetyloxy group, a pendefluorofluorooxy group, and the like.
- the amide group usually has about 2 to 20 carbon atoms, preferably 2 to 18 carbon atoms.
- Examples of the amide group include a formamide group, a acetoamide group, a propioamide group, a ptylamide group, a benzamide group, a trifluoro group.
- Examples include an acetamido group, a penufluorene benzamide group, a diformamide group, a diacetoamide group, a dipropioamide group, a dibutyroamide group, a dibenzamide group, a ditrifluoroacetamide group, a dipentafluorine benzamide group, and the like.
- Examples of the acid imide group include residues obtained by removing a hydrogen atom bonded to the nitrogen atom from an acid imide, and have about 4 to 20 carbon atoms. Illustrated.
- the monovalent heterocyclic group means a remaining atomic group obtained by removing one hydrogen atom from a heterocyclic compound, and usually has about 4 to 60 carbon atoms, preferably 4 to 20 carbon atoms.
- the carbon number of the heterocyclic group does not include the carbon number of the substituent.
- heterocyclic compounds are 'organic compounds with a cyclic structure.
- the elements constituting the ring are not only carbon atoms, but also oxygen, sulfur, nitrogen, phosphorus, boron, silicon' and other heteroatoms. Is included in the ring. Specifically, Cenyl group, ' ⁇ , ⁇ .
- a 2-alkylphenyl group, a pyridyl group, and a 2- alkylpyridyl group are preferred.
- substituted carboxyl group examples include an alkyl group, an aryl group, an aryl alkyl group or a carboxyl group substituted with a monovalent heterocyclic group, and usually has about 2 to 60 carbon atoms, preferably 2 to 4 carbon atoms.
- Specific examples thereof include methoxycarbonyl group, ethoxycarbonyl group, propoxycarbonyl group, i-propoxycarbonyl group, butoxycarbonyl group, i-butoxycarbonyl group, t-butoxycarbonyl group, pentyloxycarbonyl group, Hexyloxycarbonyl group, Cyclohexyloxycarbonyl group, Heptyloxycarbonyl group, Octyloxycarbonyl group, 2-Ethylhexyloxycar Ponyl group, Nonyloxycarbonyl group, Decyloxycarbonyl group, 3, '7-Dimethyloctyloxycarbonyl group, Dodecyloxycarbonyl group, Trifluoromethoxycarbonyl group, Pentafluoroethoxy Carbonyl group, perfluorobutoxycarbonyl group, perfluorohexoxycarbonyl group, perfluorooctyloxycarbonyl group, phenoxycarbonyl group, naphth
- repeating unit represented by the above formula (1) include the structures represented by the following formulas (11-4) to (1-5 9).
- the following formulas (1-4) to (1-5 9) may have a substituent, and preferably have one or more substituents from the viewpoint of solubility. It is more preferable to have one or more.
- R i has the same meaning as described above.
- X represents the same meaning as described above, and R 3 represents a substituent.
- ml represents an integer of 0 to 3
- m2 represents an integer of 0 to 5.
- Each of the plurality of ml and m 2 may be the same or different, if R 3 is present a plurality, they may be different even in the same 0]
- repeating units represented by the above formulas (1-1), (1-2), (1-3), from the viewpoint of ease of synthesis of monomer monomers, device characteristics, fluorescence intensity, and the like 1)
- the repeating units represented by A), (1-B), and (1-C) are preferred.
- R 3 of the formulas (1-1) to (1-3.) And (1—A) to (1—C) are From the viewpoints of solubility in organic solvents, device characteristics, and ease of monomer synthesis, alkyl groups, alkoxy groups, alkylthio groups, aryl groups, aryloxy groups, arylthio groups, arylalkyls.
- ml and m2 are preferably the sum of ml and m2 of 1 or more from the viewpoint of solubility. 2 or more is more preferable.
- the copolymer of the present invention contains a repeating unit of the above formula (2) in addition to the repeating unit of the above formula (1).
- Y 10— or 1 S— is preferable from the viewpoint of the fluorescence intensity of the polymer compound.
- Ar Represents an optionally substituted reel group or an optionally substituted monovalent complex ring group, and among the atoms constituting the ring of A r, The substituent is not bonded to the atom adjacent to the atom bonded to the nitrogen atom in the formula.
- R 2 represents a substituent, and n represents an integer of 0 to 3.
- a plurality of n may be the same or different. When a plurality of R 2 are present, they may be the same or different.
- R 2 includes an alkyl group, an alkoxy group, an alkylthio group, an aryl group, an aryloxy group, an arylthio group, an arylalkyl group, an arylalkyl group, an arylalkylthio group, an arylalkenyl group, Aryl alkynyl group, amino group, substituted ⁇ , mino group, silyl group, substituted silyl group, halogen atom, acyl group, acyloxy group, imine residue, amide group, acid imide group, monovalent heterocyclic group, force group It is preferably one selected from a group, a substitution force lpoxyl group, a nitro group and a cyano group.
- the hydrogen atom contained in these substituents may be replaced with a fluorine atom.
- a valent heterocyclic group is preferable, and an alkyl group, an alkoxy group, and an aryl group are more preferable.
- n is preferably 0 or 1 from the viewpoint of ease of monomer synthesis.
- Specific structures of the repeating unit represented by the formula (2) include structures represented by the following formulas (2-2) to (2-15).
- the aryl group or heteroaryl group bonded to the nitrogen atom may have a substituent.
- the substituent is not bonded to the atom adjacent to the atom bonded to the nitrogen atom in the formula. Specifically, in the figure below, there is no substituent at the position marked with *.
- the aryl group or heteroaryl group preferably has one or more substituents.
- R 2 and n in the formula have the same meaning as described above.
- R 4 includes an alkyl group, an alkoxy group, an alkyl group, an aryl group, an aryl group, an aryl group, an aryl group, an aryl group, an aryl group, an aryl group, an aryl group, an aryl group, an aryl group, an amino group, an amino group.
- the hydrogen atom contained in these substituents may be replaced with a fluorine atom.
- Specific examples of amino groups, substituted silyl groups, halogen atoms, acyl groups, acyloxy groups, imine residues, amide groups, acid imide groups, monovalent heterocyclic groups, and substitution force lpoxyl groups are specific examples of R, The above-mentioned groups mentioned as are exemplified.
- the heterocyclic group is preferably an alkyl group or an alkoxy group, more preferably an alkyl group.
- the repeating unit represented by the formula (1) is preferably 10 mol% or more of all repeating units, and 30 mol% or more. More preferably, it is more preferably 50 mol% or more, 60 mol It is more preferable to be at least le%.
- the repeating unit represented by the formula (2) is preferably 1 mol% or more, more preferably 10 mol% or more of all repeating units. .
- the ratio of the repeating unit represented by the formula (1) to the total repeating unit represented by the formula (1) and the repeating unit represented by the formula (2) is 40 from the viewpoint of device characteristics. -99% by weight is preferred, and 60-90% by mole is more preferred.
- the copolymer of the present invention may contain a repeating unit other than the repeating units represented by the formulas (1) and (2).
- Examples of the repeating unit other than the repeating unit represented by the formulas (1) and (2) include the repeating unit represented by the following formula (3).
- Ar 2 represents an arylene group, a divalent heterocyclic group, a divalent aromatic amine group, or a divalent group having a metal complex structure.
- the arylene group is an atomic group obtained by removing two hydrogen atoms from an aromatic hydrocarbon, having a condensed ring, two or more independent benzene rings or condensed rings being directly or a group such as pinylene.
- bonded through is also included.
- the arylene group may have a substituent.
- the number of carbon atoms in the arylene group excluding substituents is usually about 6 to 60, preferably 6 to 20.
- the total number of carbon atoms including the substituent of the arylene group is usually about 6 to 100.
- the arylene group includes a phenylene group (for example, the following formulas 1 to 3), a naphthalene diyl group (the following formulas 4 to 13), an anthracene-zyl group (the following formulas 14 to 19), a biphenyl group (the following formula 20-25), terphenyl-diyl group (formula 26-28), condensed ring compound group (formula 29-35), fluorene-zyl group (formula 36-38), stilbene-diyl (formula 39- 42), distilbene-zyl (the following formulas 43 and 44).
- a phenylene group for example, the following formulas 1 to 3
- a naphthalene diyl group the following formulas 4 to 13
- an anthracene-zyl group the following formulas 14 to 19
- a biphenyl group the following formula 20-25
- terphenyl-diyl group formula 26-28
- R represents a hydrogen atom or a substituent, and examples of the substituent include an alkyl group, an alkoxy group, an alkylthio group, an aryl group, an aryloxy group, an arylthio group, an arylalkyl group, an arylalkyl group.
- arylalkylthio group arylene alkenyl group, arylene alkynyl group, amino group, substituted amino group, silyl group, substituted silyl group, halogen atom, acyl group, acyloxy group, imine residue, amide group, acid imide Group, monovalent heterocyclic group, carboxyl group, substituted carboxyl group, and cyano group.
- the hydrogen atom contained in these substituents may be replaced with a fluorine atom.
- Specific examples of the group, the halogen atom, the acyl group, the acyloxy group, the imine residue, the amide group, the acid imide group, the monovalent heterocyclic group, and the substituted carboxy group include the same groups as the specific examples of the aforementioned R, can give. From the viewpoint of solubility and device characteristics, at least one R is preferably other than a hydrogen atom.
- the substituent group is preferably an alkyl group, an alkoxy group, an alkylthio group, an aryl group, an aryloxy group, an aryl group, an aryl alkyl group, an aryl alkyl group, or a monovalent heterocyclic group, and an alkyl group or an alkoxy group.
- An aryl group is more preferred.
- the divalent heterocyclic group means a remaining atomic group obtained by removing two hydrogen atoms from a heterocyclic I compound, and the group may have a substituent.
- a heterocyclic compound is an organic compound having a cyclic structure in which not only carbon atoms but also hetero atoms such as oxygen, sulfur, nitrogen, phosphorus, boron, and arsenic are included in the ring.
- an aromatic complex ring group is preferred.
- the number of carbon atoms in the portion excluding substituents is usually about 3 to 60. Further, the total number of carbon atoms including the substituents of the divalent heterocyclic group is usually about 3 to 100.
- divalent heterocyclic group examples include the following.
- Divalent heterocyclic group containing nitrogen as a hetero atom Divalent heterocyclic group containing nitrogen as a hetero atom; pyridine monodyl group (formula 45 to 50), diazaphenylene group (formula 51 to 54), quinoline diyl group (formula 55 to 69), quinoxaline Diyl group (Formula 70 to 74), Acridine diyl group (Formula 75 to Ma 8), Bibilidyl diyl group (Formula 79 to 81), Phenyl lindyl group (Formula 82 to 8)
- a group having a strong rubazole structure (the following formulas 85 to 87). .
- Examples include groups in which a 5-membered condensed heterocyclic group containing oxygen, nitrogen, sulfur, etc. as a hetero atom is substituted with a phenyl group, a furyl group, or a chenyl group: (Formula 1 13 to 1 18).
- divalent aromatic amine group examples include an atomic group obtained by removing two hydrogen atoms from the aromatic ring of a compound derived from an aromatic tertiary amine.
- the repeating unit represented by the following formula (4) is preferable from the viewpoint of changing the emission wavelength, improving the luminous efficiency, and improving the heat resistance.
- Ar 3 , Ar 4 , Ar 5 and Ar 6 each independently represent an arylene group or a divalent heterocyclic group.
- Ar 7 , A r 8 and A r 9 each independently represent an aryl group or a monovalent heterocyclic group.
- Ar 3 , Ar 4 , Ar Ar 6 , Ar 7 , Ar 8 and Ar 9 may have a substituent.
- X and y each independently represents a positive or positive integer.
- X is preferably 0 to 2, more preferably 0 or 1, in view of device characteristics such as lifetime and ease of monomer synthesis.
- y is preferably 0 to 2, more preferably 0 or 1, from the standpoint of device characteristics such as lifetime and ease of monomer synthesis.
- a divalent group having a metal complex structure is a remaining divalent group obtained by removing two hydrogen atoms from an organic ligand of a metal complex having an organic ligand.
- the organic ligand usually has about 4 to 60 carbon atoms.
- Examples thereof include 8-quinolinol and derivatives thereof, benzoquinolinol and derivatives thereof, 2-phenyl-pyridin and derivatives thereof, 2 -Phenyl benzothiazole and derivatives thereof, 2-phenylene benzoxazole and derivatives thereof, porphyrin and derivatives thereof, and the like.
- Examples of the central metal of the complex include aluminum, zinc, beryllium, iridium, platinum, gold, europium, and terbium.
- Examples of the metal complex having an organic ligand include a low-molecular fluorescent material, a metal complex known as a phosphorescent material, and a triplet light-emitting complex.
- divalent group having a metal complex structure examples include the following (1 2 7 to 1 3 3)
- the definition and specific examples of R in the formula are the same as described above.
- the copolymer of the present invention may further contain a repeating unit represented by the following formula (5). 1
- R 5 and R 6 each independently represent a hydrogen atom, an alkyl group, an aryl group, a monovalent heterocyclic group, a strong loxyl group, a substituted carboxy group or a cyano group.
- Specific examples of the alkyl group, aryl group, monovalent heterocyclic group and substituted carboxyl group are the same groups as the specific examples of R 1 described above.
- the copolymer of the present invention may contain a repeating unit other than the repeating units represented by the formulas (1) to (5) as long as the light emitting characteristics and the charge transporting characteristics are not impaired.
- these repeating units and other repeating units may be linked by non-conjugated units, or the repeating units may contain those non-conjugated parts.
- Examples of the binding structure include those shown below, and combinations of two or more of the following.
- R is a group selected from the same substituents as described above
- Ar is a hetero atom (oxygen, sulfur, nitrogen, silicon, boron, phosphorus, selenium) which may contain 6 carbon atoms. Shows ⁇ 60 hydrocarbon groups.
- the copolymer of the present invention may be a random, block or graft copolymer, or a polymer having an intermediate structure thereof, for example, a random copolymer having a block property. Also good. From the viewpoint of obtaining a polymer light emitter having a high quantum yield of fluorescence or phosphorescence, $ is preferably a random copolymer or a block or graft copolymer having a block property rather than a complete random copolymer. This includes cases where the main chain is branched and there are 3 or more end parts, and dendrimers.
- the polystyrene equivalent number average molecular weight of the copolymer of the present invention is a normally 1 0 3 about to 1 Fei 8, preferably 1 0 4 to 1 0 6.
- the weight average molecular weight in terms of polystyrene is usually 3
- X 10 3 to 10 8 or so preferably 5 X 10 4 or more, and more preferably 1.0 5 or more, from the viewpoint of film formability and the effect when used as an element.
- solubility it is preferred that 1 0 5 ⁇ 5 X 1 0 6 .
- a preferred range of copolymers is highly efficient when used alone in a device, or when two or more types are used in a device.
- the degree of dispersion is preferably 3 or less.
- the terminal group of the copolymer of the present invention is protected with a stable group, because if the polymerization active group remains as it is, there is a possibility that the light emission characteristics and life of the device will be reduced. Is preferred. Those having a conjugated bond continuous with the conjugated structure of the main chain are preferred, and examples thereof include a structure bonded to an aryl group or a heterocyclic group via a carbon-carbon bond.
- the copolymer of the present invention at least one of the molecular chain ends is a monovalent heterocyclic group, a monovalent aromatic amine group, a monovalent group or an aryl group derived from a heterocyclic coordination metal complex. It is expected that various properties will be added to the copolymer by sealing with aromatic end groups selected from Specifically, the effect of increasing the time to decrease the luminance of the element, the effect of increasing the charge injection property, the charge transport property, the light emission property, etc., the effect of increasing the compatibility and interaction between the copolymers, the anchor type The effect etc. are given.
- Examples of the good solvent for the copolymer of the present invention include black mouth form, methylene chloride, dichloroethane, tetrahydrofuran, toluene, xylene, mesitylene, tedraline, decalin, and n-butylbenzene. Although depending on the structure and molecular weight of the polymer compound, it can usually be dissolved in these solvents by 0.1% by weight or more.
- the copolymer of the present invention preferably has a fluorescence quantum yield of 50% or more, more preferably ⁇ 0% or more, and even more preferably 7.0% or more from the viewpoint of fluorescence intensity, device characteristics, and the like. 1 Next, a method for producing the copolymer of the present invention will be described.
- the polymer compound having a repeating unit represented by the formula (1) can be produced, for example, by polymerizing a compound represented by the formula (6) and a compound represented by the formula (7) as raw materials. Can do.
- Y 2 represents a leaving group involved in polymerization, and is bonded to the ring and / or ring.
- a ring, B ring and X are the same as described above.
- (6) includes compounds of the formulas (6-1), (6-2), (6-3)
- ⁇ 3 , ⁇ 4 , ⁇ 5 , ⁇ 6 , ⁇ 7 and ⁇ 8 represent leaving groups involved in the polymerization.
- X, R 3 , ml and m 2 are the same as described above.
- a copolymer having a repeating unit represented by the formula (2-1) can be obtained by using the compound of the formula (7-1).
- YH and Y 12 represent the involvement cheat leaving group in the polymerization.
- Y, R 2 , n, and R 4 are the same as described above. ] It can manufacture by polymerizing using the compound shown by one as a raw material.
- the two polymerizations that become a repeating unit other than the above formulas (1) and (2) may be performed in the presence of a compound having a substituent involved.
- the end-capped copolymers are represented by, for example, the above formulas (6), (6-1) to (6-3), (7), (7 — 1).
- it can be produced by polymerization using compounds represented by the following formulas (8) and (9) as raw materials.
- E 1 and E 2 represent a monovalent heterocyclic ring, a substituted aryl group, a monovalent aromatic amine group, and a monovalent group derived from a bicyclic coordination metal complex
- Y, 3 , Y l4 each independently represents a leaving group that can participate in the polymerization.
- the leaving group that participates in the polymerization ⁇ and ⁇ can be a halogen atom, an alkylsulfonyloxy, a silyl group, an arylsulfonyloxy group.
- B (OR,,) 2 wherein RH is a hydrogen atom or an alkyl group).
- examples of the halogen atom include a chlorine atom, a bromine atom, and an iodine atom, a chlorine atom and a bromine atom are preferable, and a bromine atom is most preferable.
- the argylsulfonyloxy group may be substituted with a fluorine atom, and examples thereof include a trifluoromethanesulfonyloxy group.
- the arylsulfonyloxy group may be substituted with an alkyl group, and examples thereof include a phenylsulfonyloxy group and a trisulfonyloxy group.
- R U is a hydrogen atom or an alkyl group.
- the alkyl group generally has about 1 to 20 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, an octyl group, and a dodecyl group.
- alkyl groups may be connected to form a ring.
- the total amount of monomers charged is the sum of the general formulas (6), (6— :!) to. (• 6—3), (7), (7-1) Generally, it is 0.1 to 20 mol%, preferably 0.2 to 10 mol%, based on the total amount of monomers charged.
- a method for producing the copolymer of the present invention for example, a method in which the above-mentioned corresponding monomer is used and then polymerized by a Suzuki reaction (Chem. Rev. 95, 2457 (1995) )) Polymerization by Grignard reaction (Kyoritsu Shuppan, Polymer Functional Materials Series 2, Polymer Synthesis and Reaction (2), 432-3), Polymerization by Yamamoto Polymerization (progressive) Polymer Science (Prog. Po.lym. Sci.), Vol.
- Y and Y 2 are each independently a group represented by —B (OR M ) 2 (where R M is a hydrogen atom or an alkyl group), and Y 3 and Y 4 are each independently a halogen atom, an alkylsulfonyl Niruokishi group or ⁇ Li one Le sulfonyl O alkoxy group, Upsilon 7 is - B (oR ,,) 2 (wherein, R u is hydrogen atom or an alkyl group) represented by And a monomer in which Y 8 is a halogen atom, an alkylsulfonyloxy group or an arylsulfonyloxy group, and these monomers are reacted in the presence of a Pd (0) catalyst.
- R M is a hydrogen atom or an alkyl group
- Y 3 and Y 4 are each independently a halogen atom, an alkylsulfonyl Niruokishi group or ⁇ Li
- At least one of the two or more monomers having two leaving groups used for the reaction is —B (OR ,,) 2 (where R,, are hydrogen atoms) Or at least one of them is a monomer having two halogen atoms, alkylsulfonyloxy groups or arylsulfonyloxy groups.
- the reaction is usually carried out by reacting the monomers represented by the formulas (6), (6-1)-(6-3), (7), (7-1) for about 1 to 100 hours, The monomer (9) is added to the system and allowed to react for about 0.5 to 50 hours, and then the monomer (8) is added to the system and reacted for about 0.5 to 50 hours. Make it.
- the Pd (0) catalyst for example, palladium [tetrakis (triphenylphosphine)], palladium acetates (for example, a catalyst system obtained by reducing palladium acetate with a triphenylphosphine derivative), etc., potassium carbonate, sodium carbonate, water
- An inorganic base such as barium oxide, an organic base such as triethylamine, and an inorganic salt such as cesium fluoride are added in an equivalent amount, preferably 1 to 10 equivalents, relative to the monomer.
- the inorganic salt may be reacted in a two-phase system as an aqueous solution.
- the solvent examples include N, N-dimethylformamide, toluene, dimethoxyethane, and tetrahydrofuran.
- a temperature of about 50 to 160 is preferably used. The temperature may be raised to near the boiling point of the solvent and refluxed.
- the reaction time is about 1 to 200 hours.
- the polymerization reaction is usually carried out in a reaction system in which the Pd (0) catalyst is not deadly activated in an inert gas atmosphere such as argon or nitrogen.
- ⁇ ,, ⁇ 2, . ⁇ 3 , ⁇ 4 ',', ⁇ 7 and Upsilon 8 are each independently a halogen atom, monomer alkylsulfonyl O alkoxy group or ⁇ 'reel sulfonyl O alkoxy group Can be produced by reacting these monomers in the presence of Ni (0) complex; The reaction is usually carried out by mixing all monomers (6), (6-1) to (6-3), (7), (7-1), (8), (9).
- the reaction is usually carried out by mixing all monomers (6), (6-1) to (6-3), (7), (7-1), (8), (9).
- Ni (0) complex zero-valent nickel complex
- nickel complexes There are two types of nickel complexes: a method using zero-valent nickel as it is, and a method in which a nickel salt is reacted in the presence of a reducing agent to produce a zero-valent dike and react in the system.
- zero-valent nickel complexes include bis (1,5-cyclooctagen) nickel (0), (ethylene) bis (triphenylphosphine) nickel (0), tetrakis (triphenylphosphine) nickel, Of these, bis (1,5-cyclohexane) nickel (0) is preferred from the viewpoint of versatility and low cost.
- the neutral ligand is a ligand that does not have an anion cation, such as 2, 2'-pipyridyl, 1,10-phenantine phosphorus, methylenebisoxazoline, N, N'-tetramethyl.
- Nitrogen-containing ligands such as ethylenediamine; triphenylphosphine, tritolylphosphine, tributylphosphine, ⁇ phenoxyphosphine 3rd phosphine ligands such as tin are preferred, nitrogen-containing ligands are preferred in terms of versatility and low cost, and 2,2'-bibilidyl is particularly high in terms of high reactivity and high yield. preferable.
- a system in which 2,2′-bibilidyl is added as a neutral ligand to a system containing bis (1,5-cyclooctagen) nickel (0) Good.
- nickel chloride, nickel acetate, etc. can be cited as nickel salts.
- the reducing agent include zinc, sodium hydride, hydrazine and its derivatives, lithium aluminum hydride, etc., and if necessary, iodine iodide, ammonium iodide, lithium iodide, potassium iodide, etc. are used as T additives.
- the polymerization solvent is not particularly limited as long as it does not inhibit the polymerization, but preferably includes one or more aromatic hydrocarbon solvents and / or ether solvents.
- examples of the aromatic hydrocarbon solvent include benzene, toluene, xylene, trimethylbenzene, tetramethylbenzene, butylbenzene, naphthalene, tetralin, and the like. Toluene, ticilene, tetralin, tetramethyl Benzene is preferred.
- examples of ether solvents include diisopropyl ether, tetrahydrofuran, 1,4-dioxane, diphenyl ether, ethylene glycol dimethyl ether, tert-butyl methyl ether, and the like, which are good solvents for polymer compounds.
- the solvent may be an aromatic hydrocarbon solvent, a Z- or Edel solvent and an aromatic hydrocarbon solvent, as long as it does not inhibit the polymerization reaction.
- a mixed solvent with a solvent other than the ether solvent may be used.
- the reaction operation and the like can be performed, for example, according to the method described in Japanese Patent Application Laid-Open No. 2 00-4 45 4 44.
- the polymerization reaction is usually carried out in an inert gas atmosphere such as argon or nitrogen, in a tetrahydrofuran solvent at a temperature of 60, and in the presence of a zero-valent nickel complex or a neutral ligand.
- the polymerization time is usually about 0.5 to 100 hours, but is preferably within 10 hours from the viewpoint of production cost.
- the polymerization temperature is usually about 0 to 20 but is preferably 20 to 100 from the viewpoint of high yield and low heating cost.
- the amount used is preferably about 0.5 to 10 moles per mole of zerovalent nickel complex in terms of reaction yield and cost. 0. 8 -1.5 mol is more preferable, and 0.9-1.1 mol is more preferable.
- the amount of the zero-valent nickel complex used is not particularly limited as long as it does not inhibit the polymerization reaction. However, if the amount used is too small, the molecular weight tends to be low. There is a tendency to become complicated. Therefore, 0.1 to 10 mol is preferable, 1 to 5 mol is more preferable, and 1.7 to 3.5 mol is more preferable with respect to 1 mol of the monomer.
- the purity affects the device performance such as light emission characteristics, so the monomer before polymerization is distilled, sublimation purified, recrystallization, etc. However, it is preferable to polymerize afterwards. Further, after the polymerization, it is preferable to perform purification treatment such as reprecipitation purification and fractionation by chromatography.
- the polymer compounds of the present invention those produced by a method of polymerizing with a nickel zero-valent complex are the device characteristics such as polymer LED lifetime, light emission starting voltage, current density, and voltage rise during driving, or Preferred from the viewpoint of heat resistance and the like
- the polymer composition of the present invention is characterized by containing at least one material selected from a hole transport material, an electron transport material and a light emitting material and the copolymer of the present invention.
- the content ratio of at least one material selected from a hole transport material, an electron transport material, and an optical material and the polymer compound of the present invention may be determined according to the application.
- hole transporting material W 099/13692 WO99Z48160, GB2340304A, WOO 0/53 656, WO 01/19834, W00 / 55927, GB 2348316, WO 0 / 46321, WO 00/06665, W0 99 54943, WO 99/5438 5, US 5777070, WO 98 06773, W0 97 05184, WO 00/35987, W0 00/53655, W0 01/34722, WO 99 / 24526, W00 / 22027, W00 / 22026, W098 / 27136, US573636, WO98 / 21262, US574192
- 'As low-molecular-weight fluorescent materials for example, naphthalene derivatives, anthracene or derivatives thereof, perylene or derivatives thereof, polymethine-based, xanthene-based, coumarin-based, cyanine-based pigments, etc. Hydroxyquinoline or its!
- a metal complex of a conductor, an aromatic amine, a chitra fuel cyclopentene or a derivative thereof, or a tetraphenyl butadiene or a derivative thereof can be used. .
- triplet light-emitting complexes examples include I r (ppy) 3 with iridium as the central metal, B t tp 2 Ir (acac) P t OE P with platinum as the central metal scrap, and E with europium as the central metal.
- triplet light-emitting complexes include N ature, (1998),. 395, 1 51, Ap 1. Phy s. Let t. (1999), 75 (1), 4, P r oc SPIE— Int. Soc. O t. Eng. (2001), 4105 (Organic Li-G-t—Emit ng Materials and Devices IV), 119, J. Am. C h em. So c., (2001), 123, 4304, A ppl. Phy s. Let t., (1997), 71 (18), 2596, Syn. M et., (1998), 94 (1), 103, Syn. Met., (1999), 99 (2), 1361, Adv. Mater., (1999), 1 1 (10), 852, J pn. J. Ap p 1. Phy s , 34, 1883 (1995).
- a thin film for a high molecular weight LED can be formed by a printing method or the like.
- the solution of the present invention only needs to contain at least one type of the copolymer of the present invention.
- a hole transport material, an electron transport material, a light emitting material, a solvent, Additives such as stabilizers may be included.
- the proportion of the copolymer of the present invention in the ink composition is the total weight of the composition excluding the solvent. On the other hand, it is usually 20 wt% to 100 wt%, preferably 40 wt% to 10 O wt%.
- the ratio of the solvent in the ink composition is 1 wt% to 99.9 wt%, preferably 60 wt% to 99.5 wt%, more preferably based on the total weight of the composition. 8 0 wt% to 9.9. O wt% T.
- the viscosity of the ink composition varies depending on the printing method.However, when the ink composition passes through the discharge device, such as the ink jet print method, the viscosity is used to prevent clogging and flight bending during discharge. Is preferably in the range of 2 to 2 O m Pa ⁇ s at 25, more preferably in the range of 5 to 2 O m Pa ⁇ s, and 7 to 2 O m Pa ⁇ s. More preferably, it is in the range of s.
- the solution of the present invention may contain an additive for adjusting viscosity and Z or surface tension.
- the additives include high molecular weight compounds (thickeners) for increasing viscosity, poor solvents, low molecular weight compounds for decreasing viscosity, and surfactants for decreasing surface tension as appropriate. And use it.
- the high molecular weight polymer compound may be any compound that is soluble in the same solvent as the polymer compound of the present invention and does not inhibit light emission or charge transport.
- high molecular weight polystyrene, polymethyl methacrylate, or a polymer compound of the present invention having a high molecular weight can be used.
- a poor solvent can be used as a thickener. In other words, the viscosity can be increased by adding a small amount of a poor solvent for the solid content in the solution.
- the solvent type and addition amount may be selected within a range in which the solid content in the solution does not precipitate.
- the amount of the poor solvent is preferably 50 wt% or less, more preferably 30 wt% or less with respect to the entire solution.
- the solution of the present invention may contain an antioxidant in addition to the copolymer of the present invention in order to improve storage stability.
- the antioxidant is not particularly limited as long as it is soluble in the same solvent as the copolymer of the present invention and does not inhibit light emission or charge transport, and examples thereof include phenolic antioxidants and phosphorus antioxidants.
- the copolymer of the present invention can be dissolved or uniformly dispersed. What can be done is preferable.
- the solvent include chlorine solvents such as chloroform, methylene chloride, 1,2-dichloroethane, 1,1,2-trichloroethane, chloroform, o-dichlorobenzene, tetrahydrofuran, dioxane, etc.
- Ether solvents aromatic hydrocarbon solvents such as toluene, xylene, cyclohexane, methylcyclohexane, n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n-decane, etc.
- Aliphatic hydrocarbon solvents such as acetone, methyl ethyl ketone, cyclohexanone, ester solvents such as ethyl acetate, butyl acetate, ethyl cellosolve acetate, ethylene glycol, ethylene glycol monobutyl ether, Ethylene glycol monoethyl ether — ter, ethylene glycol monomethyl ether, dimeth Shetan, Propylene diol, Diethoxymethane, Triethylene glycol monoethyl ether, Glycerin, Polyhydric alcohol such as 1,2-hexanediol and its derivatives, Methanol; Ethanol, propanol, Isopropanol, Cyclohexanol, etc.
- ketone solvents such as acetone, methyl ethyl ketone, cyclohexanone
- ester solvents such as ethyl acetate, butyl acetate
- Examples include alcohol solvents, sulfoxide solvents such as dimethyl sulfoxide, and amide solvents such as N-methyl-2-pyrrolidone and N, N-dimethylformamide. These solvents can be used alone or in combination. Among the above solvents, it is preferable to include one or more organic solvents having a structure containing at least one benzene ring, a melting point of 0 ° C. or less, and a boiling point of 100 or more.
- aromatic hydrocarbon solvents aromatic hydrocarbon solvents, aliphatic hydrocarbon solvents, ester solvents, and ketone solvents are preferable from the viewpoints of solubility in organic solvents, uniformity during film formation, and viscosity characteristics. Good.
- the type of solvent in the solution is preferably two or more from the viewpoints of film formability and device characteristics.
- the polymer compound of the present invention contained in the solution may be one type or two or more types, and may contain a polymer compound other than the polymer compound of the present invention as long as the device characteristics and the like are not impaired.
- the solution of the present invention may contain water, a metal and a salt thereof in a range of 1 to 100 ppm.
- metals include lithium, sodium, calcium, potassium, iron, copper, nickel, aluminum, zinc, chromium, manganese, cobalt, platinum, and iridium. And so on.
- silicon / phosphorus, fluorine, chlorine, and bromine may be contained within a range of 1 to 100 ppm.
- the spin coating method, casting method, micro gravure coating method, gravure coating method, bar coating method, roll coating method, wire-barco coating method, dive coating method, spray coating method, screen Thin films can be produced by printing methods, flexographic printing methods, offset printing methods, ink-jet printing methods, and the like.
- the solution of the present invention is preferably used for a film forming method by a screen printing method, a flexographic printing method, an offset printing method, or an ink jet printing method, and more preferably used for a film forming by an ink jet method.
- the thin film of the present invention will be described.
- the thin film include a light-emitting thin film, a conductive thin film, and an organic semiconductor thin film.
- the light-emitting thin film has a quantum yield of light emission of preferably 50% or more, more preferably 60% or more, and more preferably 70% or more from the viewpoint of device brightness, light emission voltage, and the like. More preferably it is.
- the conductive thin film preferably has a surface resistance of 1 ⁇ / mouth or less.
- the electrical conductivity can be increased by doping the thin film with a Lewis acid, an ionic compound or the like.
- the surface resistance is more preferably 10 ⁇ or less and more preferably 10 ⁇ .
- the organic semiconductor thin film is preferably 1 0- 5 cm 2 / VZ seconds. More preferably, it is 10 ⁇ 3 cm 2 ZV / second or more, and further preferably 10 ⁇ 1 cm 2 ZV / second or more.
- An organic transistor can be formed by forming the organic semiconductor thin film on an Si substrate on which an insulating film such as Si02 and a gate electrode are formed, and forming a source electrode and a drain electrode with Au or the like. it can.
- An organic transistor can be formed using an organic semiconductor thin film.
- the copolymer of the present invention usually emits fluorescence or phosphorescence in a solid state, and can be used as a polymer light emitter (high molecular weight light emitting material). Further, the polymer compound has an excellent charge transporting ability and can be suitably used as a polymer LED material or a charge transport material.
- Polymer L ⁇ D using the polymer light emitter is a high performance polymer LED that can be driven with low voltage and high efficiency. Therefore, the polymer LED can be preferably used for a backlight of a liquid crystal display or a device such as a curved or flat light source for illumination, a segment type display element, a dot matrix flat panel display.
- the copolymer of the present invention can be used as a laser dye, an organic solar cell material, an organic semiconductor for an organic transistor, a conductive thin film, or a conductive film material such as an organic semiconductor thin film.
- it can also be used as a light-emitting thin film material that emits fluorescence or phosphorescence.
- the polymer LED of the present invention is characterized by having an organic layer between lightning electrodes composed of an anode and a cathode, and the organic layer contains the copolymer of the present invention.
- the organic layer (a layer containing an organic substance) may be any of a light emitting layer, a hole transport layer, an electron transport layer, and the like, but the organic layer is preferably a light emitting layer.
- the light emitting layer refers to a layer having a function of emitting light
- the hole transport layer refers to a layer having a function of transporting holes
- the electron transport layer is a layer having a function of transporting electrons.
- the electron transport layer and the hole transport layer are collectively referred to as a charge transport layer. Two or more light emitting layers, hole transport layers, and electron transport layers may be used independently.
- the light emitting layer that is an organic layer may further contain a hole transporting material, an electron transporting material, or a light emitting material.
- the light-emitting material refers to a material that exhibits fluorescence and / or phosphorescence.
- the mixing ratio of the hole transporting material is lw t% to 80 wt%, preferably 5 wt% to 60 wt% with respect to the entire mixture. wt%.
- the mixing ratio of the electron transporting material to the entire mixture is lw t% to 8 Ow t%, preferably 5 wt% to 6%. Ow t%.
- the mixing ratio of the luminescent material to the entire mixture is lw t% to 8 O w t%, Preferably, it is 5w t% to 6 Ow t.
- the mixing ratio of the light emitting material is 1 wt% to 5 Ow t with respect to the entire mixture.
- the total of the hole transport material and the electron transport material is 1 wt% to 5 O wt%, preferably 5 wt% to
- the content of the polymer compound of the present invention is 99 wt% to 20 wt%.
- the film thickness of the light-emitting layer of the polymer LED of the present invention may be selected so that the optimum value varies depending on the material used, and the drive voltage and light emission efficiency are appropriate. To 1 m, preferably 2 nm to 500 nm, more preferably 5 nm to 200 nm.
- Examples of the method for forming the light emitting layer include a method of forming a film from a solution.
- film formation methods from solution include spin coating method, casting method, micro gravure coating method, gravure coating method, bar coating method, roll coating method, wire bar coating method, drive coating method, spray coating method, Coating methods such as screen printing, flexographic printing, offset printing, and ink jet printing can be used.
- Printing methods such as a screen printing method, a flexographic printing method, an offset printing method, an inkjet printing method, and an ink jet printing method are preferable because pattern formation and multicolor coating are easy. '
- the polymer light-emitting device of the present invention preferably has a maximum external quantum yield of 1% or more when a voltage of 3.5 V or more is applied between the anode and the cathode from the viewpoint of device brightness and the like. 1.5% or more is more preferable.
- the polymer light emitting device of the present invention includes a polymer LED in which an electron transport layer is provided between the cathode and the light emitting layer, and a hole transport between the anode and the light emitting layer.
- Polymer LEDs having a layer polymer LEDs having an electron transport layer provided between a cathode and a light-emitting layer, and a hole transport layer provided between an anode and a light-emitting layer, and the like.
- the following structures a) to d) are specifically exemplified.
- the polymer compound of the present invention is contained in the hole transport layer and / or the electron transport layer. Including those that are.
- the polymer compound of the present invention is preferably a polymer compound containing a hole transporting group.
- examples thereof include a copolymer with an aromatic amine and a copolymer with stilbene.
- the polymer compound of the present invention is preferably a polymer compound containing an electron transporting group, and specific examples thereof include oxaziazole.
- the hole transporting material used is polyvinylcarbazole or a derivative thereof, polysilane or a derivative thereof, and an aromatic amine in the side chain or main chain.
- JP-A-6 3-7 0 25 57, JP-A-6 3-7 786, JP-A-2-13 5 3 5 9 No. 2-1 3 5 3 6 No. 1-No. 2-2 0 9 9 8 8 No. 3-3 7 9 9 No. 2 No. 3-1 5 2 1 8 No. 4 Examples are described.
- a hole transporting material used for the hole transport layer polyvinylcarbazole or a derivative thereof, polysilane or a derivative thereof, a polysiloxane derivative having an aromatic amine compound group in a side chain or a main chain, polyaniline Or a derivative thereof, polythiophene or a derivative thereof, poly (p-phenylenevinylene) or a derivative thereof, Or a polymer hole transporting material such as poly (2,5-cenylylene) or a derivative thereof, and more preferably polyvinylcarbazol or a derivative thereof, polysilane or a derivative thereof, a side chain or A polysiloxane derivative having an aromatic amine in the main chain.
- Examples of the hole transporting material of low molecular weight compounds include pyrazoline derivatives, arylamine derivatives, stilbene derivatives, and triphenyldiamin derivatives.
- a low molecular hole transport material it is preferably dispersed in a polymer binder.
- the polymer binder to be mixed those not extremely disturbing charge transport are preferable: those not strongly absorbing visible light are preferably used.
- the polymer binder include: 'poly (N-vinylcarbazol)', 'polyaniline or a derivative thereof, polythiophene or a derivative thereof, poly (p-phenylenevinylene) or a derivative thereof, poly (2, .5 —Chenylenebi! Len) or derivatives thereof, polycarbonate, polyacrylate, polymethyl acrylate, polymethyl methacrylate, polystyrene, polyvinyl chloride, polysiloxane and the like.
- Polyvinylcarbazole or its derivatives are obtained, for example, from a vinyl monomer by cation polymerization or radical polymerization.
- polysiloxane or a derivative thereof has almost no hole transporting property in the cyclohexane skeleton structure
- those having the structure of the low molecular hole transporting material in the side chain or main chain are preferably used.
- those having a hole transporting aromatic amine in the side chain or main chain are exemplified.
- the method for forming the hole transport layer is not limited, but for a low molecular hole transport material, a method of forming a film from a mixed solution with a polymer binder is exemplified. In the case of a polymer hole transporting material, a method of film formation from a solution is exemplified.
- a hole transporting material can be dissolved or uniformly dispersed. Those are preferred. Chlorine form such as chloroform, methylene chloride, 1,2-dichloroethane, 1,1,2-trichloroethane, black benzene, o-dichlorobenzene, etc., ethers such as tetrahydrofuran, dioxane, etc.
- Solvents aromatic hydrocarbon solvents such as toluene and xylene, aliphatics such as cyclohexane, methylcyclohexane, n-pentane, n-hexane, n-heptane, n-octane, n-nonane and n-decane Hydrocarbon solvents, ketone solvents such as acetone, methyl ethyl ketone, cyclohexanone, ester solvents such as ethyl acetate, butyl acetate, ethyl cellosolve acetate, ethylene glycol, ethylene glycol monobutyl ether, ethylene glycol Monoethyl ether, ethylene glycol monomethyl ether, dimethoxy Ethane, propylene glycol, diethoxymethane, triethylene glycol monoethyl ether, glycerin, polyhydric alcohols such as 1,2-hexanediol
- film formation methods from solution include spin coating from solution, casting method, microgravure coating method, gravure coating method, bar coating method, mouth coating method, wire bar coating method, dip coating method, spray coating Coating method such as screen printing method, flexographic printing method, offset printing method, ink jet printing method, etc.
- the optimum value for the film thickness of the hole transport layer varies depending on the material used. The efficiency may be selected to be an appropriate value, but at least a thickness that does not cause pinholes is necessary. If the thickness is too large, the driving voltage of the element is undesirably high. Therefore, the film thickness of the hole transport layer is, for example, 1 nm to 1 m, preferably 2 ⁇ ! ⁇ 50 00 nm, and more preferably 5 nm to 20 00 nm.
- the electron transporting material such as oxadiazole derivative, anthraquinodimethane or derivative thereof, benzoquinone or derivative thereof, naphthoquinone or derivative thereof.
- Derivative, anne Traquinone or its derivatives / tetracyananthraquinodimethane or its derivative, fluorenone derivative, diphenyldisyanoethylene or its derivative, diphenoquinone derivative, or a metal complex of 8-hydroxyquinoline or its derivative, polyquinoline or its Derivatives, polyquinoxaline or its derivatives, polyfluorene or its derivatives, etc. are exemplified.
- Japanese Patent Laid-Open Nos. 6-3-7 0 2 57 and 63-1 7 5 860
- Japanese Patent Laid-Open No. 2-1 3 5 359 and 2-13 5 3 6 1 publication
- 2-2 0 9 9 8 8 publication '3-3 7 9 9 2 publication
- 3-1 5 2 1 8 4 publication etc. Illustrated.
- oxadiazole derivatives benzoquinone or its derivatives, anthraquinone or its derivatives, or metal complexes of 8-hydroxyquinoline or its derivatives, polyquinoline or its derivatives, polyquinoxaline or its derivatives, Rifluorene or its derivatives are preferred, 2— (4-biphenylyl) — 5— (4-t-butylphenyl) — 1, 3, 3, 4-oxadiazol, benzoquinone, anthraquinone, tris (8—quinolinol) aluminum, Polyquinoline is even more preferred.
- the method for forming the electron transport layer there are no particular restrictions on the method for forming the electron transport layer, but for low molecular weight electron transport materials, vacuum deposition from powder or film deposition from a solution or molten state can be used.
- the material include a method by film formation from a solution or a molten state.
- the above polymer binder may be used in combination.
- the solvent used for film formation from a solution is preferably a solvent that can dissolve or uniformly disperse the electron transport material and / or the polymer binder.
- a solvent that can dissolve or uniformly disperse the electron transport material and / or the polymer binder.
- chlorine-based solvents such as black mouth form, methyl chloride, 1,2-dichloroethane, 1,1,2-trichloroethane, black mouth benzene, o-dichloro mouth benzene, and ether solvents such as tetrahydrofuran and dioxane , Aromatic hydrocarbon solvents such as toluene, xylene, cyclohexane, methyl cyclohexane, n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n-decane, etc.
- Hydrocarbon solvents such as acetone, methyl ethyl ketone, cyclohexanone, ester solvents such as ethyl acetate, butyl acetate, ethyl cellosolve acetate, ethylene glycol, ethylene glycol monobutyl ether, ethyl Polyethylene alcohol and its derivatives, such as render glycol monoethyl ether, ethylene glycol ⁇ nomethyl ether, dimethoxetane, propylene glycol, methoxymethane, triethylene glycol ⁇ monoethyl ether, glycerin, 1,2-hexanediol, etc.
- ketone solvents such as acetone, methyl ethyl ketone, cyclohexanone
- ester solvents such as ethyl acetate, butyl acetate, ethyl cellosolve acetate, ethylene glycol, ethylene glycol monobutyl
- Examples include alcohol solvents such as methanol, ethanol, propanol, isopropanol, and cyclohexanol, sulfoxide solvents such as dimethyl sulfoxide, and amide solvents such as ⁇ -methyl-2-pyrrolidone, ⁇ , ⁇ ⁇ ⁇ ⁇ -dimethylformamide, etc. Is done. These organic solvents can be used alone or in combination.
- Film deposition methods from solution or melt include spin coating, casting, micro gravure coating, gravure coating, bar coating, roll coating, wire bar coating, dip coating, no spray coating
- Application methods such as a printing method, a screen printing method, a flexographic printing method, an offset printing method, and an inkjet printing method can be used. ,
- the polymer compound of the present invention can also be used as a polymer field-effect transistor.
- a source electrode and a drain electrode are usually provided in contact with an active layer made of a polymer, and a gate electrode is provided with an insulating layer in contact with the active layer interposed therebetween. It only has to be.
- the polymer field effect transistor is usually formed on a supporting substrate.
- the material of the support substrate is not particularly limited as long as the characteristics as a field effect transistor are not impaired, but a glass substrate, a flexible film substrate, or a plastic substrate can also be used.
- the field effect transistor and the star can be manufactured by a known method, for example, a method described in JP-A No. 5-110.09.
- an organic solvent-soluble polymer In forming the active layer, it is very advantageous and preferable to use an organic solvent-soluble polymer. Film formation methods from solutions in which polymers are dissolved in organic solvents include spin coating, casting, micro gravure coating, gravure coating, bar coating, roll coating, wire bar coating, Coating methods such as dip coating, spray coating, screen printing, flexographic printing, offset printing, and inkjet printing can be used.
- Encapsulated polymer field-effect transistor formed by creating a polymer field-effect transistor and then sealing it Evening is preferred.
- the polymer field-effect transistor is cut off from the atmosphere, and the deterioration of the characteristics of the high-molecular electric field transistor can be suppressed.
- ⁇ Sealing methods include: ⁇ Covering with UV curable resin, thermosetting resin or inorganic Si ONX film, etc., and bonding glass plate or film with UV curable resin, thermosetting resin, etc. can give.
- the thickness of the electron transport layer differs depending on the material used, and it may be selected so that the drive voltage and light emission efficiency are appropriate. At least, the thickness should be such that pinholes do not occur If the thickness is too thick, the driving voltage of the child increases, which is not preferable. Therefore, the thickness of the electron transport layer is, for example, 1 nm to 1 ⁇ , preferably 2′ ⁇ ! ⁇ 0.5 00 nm, and more preferably 5 nm to 20 nm.
- those that have the function of improving the charge injection efficiency from the electrodes and have the effect of lowering the driving voltage of the element are particularly those of the charge injection layer (hole (Injection layer, electron injection layer)
- the charge injection layer described above or an insulating layer having a thickness of 2 nm or less may be provided adjacent to the electrode.
- a thin buffer layer may be inserted at the interface between the charge transport layer and the light emitting layer to improve adhesion and prevent mixing.
- the order of the layers to be laminated and the thickness of each layer can be appropriately used in consideration of the light emission efficiency and the element lifetime.
- a polymer LED provided with a charge injection layer includes a polymer LED provided with a charge injection layer adjacent to the cathode, and a charge injection layer adjacent to the anode.
- the polymer compound of the present invention is a hole. Including those contained in the transport layer and electron transport layer
- the polymer LED of the present invention includes those in which the polymer compound of the present invention is contained in a hole injection layer and / or an electron injection layer.
- the polymer compound of the present invention is preferably used simultaneously with an electron accepting compound.
- the polymer compound of the present invention is used in an electron transport layer, it is preferably used at the same time as an electron donating compound.
- simultaneous use there are methods such as mixing, 'copolymerization, and introduction as a side chain.
- the charge injection layer include: a layer containing a conductive polymer; provided between the electrode and the hole transport layer; and an intermediate between the anode material and the hole transport material contained in the hole transport layer.
- the electrical conductivity of the conductive polymer is preferably 1 ( ⁇ 5 S / cm or more and 10 3 or less, and a leakage current between the light emitting pixels. for the smaller is 1 0 2, more preferably less than 1 0- 5 S / cm, 1 0- 5 3: 171 or 1 0 'or less is more preferred.
- the electrical conductivity of the conductive polymer is 1 0-5 preferably SZcm least 1 O 3 is S / cm or less, and for decreasing leak current between light emitting pixels, 10- 5 SZcm least 10 2 S / cm or less, more preferably tool, 10_ 5 SZ cm or more and 10 ′ S / cm or less is more preferable.
- a suitable amount of ions are doped into the conducting polymer.
- the type of ions to be doped is an anion for the hole injection layer and a cation for the electron injection layer.
- anions include polystyrene sulfonate ions, alkylbenzene sulfonate ions, camphor sulfonate ions, etc.
- cations include lithium ions, sodium ions, potassium ions, tetraptyl ammonium ions. Etc. are exemplified. '
- the thickness of the charge injection layer is, for example, 1 nm to 100 nm, and preferably 2 nm to 50 nm.
- the material used for the charge injection layer may be appropriately selected in relation to the material of the electrode and the adjacent layer.
- An insulating layer having a thickness of 2 nm or less has a function of facilitating charge injection.
- the material for the insulating layer include metal fluorides, metal oxides, and organic insulating materials.
- a polymer LED with an insulating layer with a thickness of 2 nm or less is a polymer LED with an insulating layer with a thickness of 2 nm or less adjacent to the cathode, and an insulation with a thickness of 2 nm or less adjacent to the anode. Examples include polymer LED provided with a layer.
- Anode layer with a thickness of 2 nm or less Light emitting layer Z layer thickness with insulation layer / cathode with a thickness of 2 nm or less t) Anode Z layer thickness with thickness less than 2 nm u) Anode / hole transport layer Z light-emitting layer / insulation layer / cathode with a thickness of 2 nm or less
- Insulating layer with an anodic film thickness of 2 nm or less Z hole transport layer, luminescent layer / electron transport layer, no-cathode,.
- the polymer LED of the present invention has the element structure exemplified in the above a) to ab) in any one of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection scrap Examples include those containing the polymer compound of the invention. .
- the substrate that forms the polymer LED of the present invention may be any substrate that does not change when an electrode is formed and an organic layer is formed, such as glass, plastic, polymer film, and silicon substrate.
- the opposite electrode is preferably transparent or translucent.
- At least one of the anode and the cathode of the polymer LED of the present invention is transparent or translucent.
- the anode side is preferably transparent or translucent.
- a conductive metal oxide film, a translucent metal thin film, or the like is used as the material of the anode. Specifically, a film made of indium oxide, zinc oxide, tin oxide, and conductive glass made of indium, tin, oxide (ITO), indium, zinc, oxide, etc., which are composites thereof. (NESA, etc.), gold, platinum, silver, copper, etc. are used, and indium / zinc / oxide and tin oxide are preferred. Examples of the production method include vacuum deposition, sputtering, ion plating, and plating. As the anode, polyaniline or a derivative thereof, polythiophene or a derivative thereof An organic transparent conductive film such as a conductor may be used.
- the film thickness of the anode can be appropriately selected in consideration of light transmittance and electric conductivity.
- the film thickness is 10 nm to 10 m, preferably 20 nm to 1; am More preferably, it is 50 nm to 50 Q nm.
- an average film thickness of a layer made of a phthalocyanine derivative, a conductive polymer, carbon, or a metal oxide, a metal fluoride, an organic insulating material, or the like 2 A layer of nm or less may be provided.
- the material of the cathode used in the polymer LED of the present invention is preferably a material having a low work function.
- metals such as lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, aluminum, scandium, vanadium, zinc, yttrium, indium, cerium, samarium, europium, terbium, ytterbium, and the like
- Two or more of these alloys, or one or more of them, and one or more of gold, silver, platinum, copper, manganese, titanium, cobalt, nickel, tungsten, tin, graphite Or a graphite intercalation compound or the like is used.
- the cathode may have a laminated structure of two or more layers.
- the film thickness of the cathode can be appropriately selected in consideration of electric conductivity and durability, for example, from 10 nm to 10 m, preferably 20 nm to l ⁇ , more preferably 50 n ir! ⁇ 5 0 0 nm.
- a vacuum deposition method, a sputtering method, a laminating method in which a metal thin film is thermocompression bonded, or the like is used.
- a layer made of a conductive polymer or a layer having an average film thickness of 2 nm or less made of a metal oxide, a metal fluoride, an organic insulating material, or the like may be provided between the cathode and the organic material layer.
- a protective layer for protecting the polymer LED may be attached after the cathode is produced. In order to use the polymer LED stably for a long period of time, it is preferable to attach a protective layer and a protective cover to protect the device from the outside.
- a polymer compound, metal oxide, metal fluoride, metal boride, metal nitride, organic-inorganic hybrid material, or the like can be used.
- a glass plate, a plastic plate having a low water permeability treatment on the surface, and the like can be used, and the cover is attached to the element substrate with a heat effect tree or a photo-curing resin.
- the method of sealing is preferably used. If the space is maintained by using a spacer, it is easy to prevent the element from being scratched.
- an inert gas such as nitrogen or argon is sealed in the space, oxidation of the cathode can be prevented, and further, a desiccant such as barium oxide is placed in the space to adsorb it in the manufacturing process.
- a desiccant such as barium oxide is placed in the space to adsorb it in the manufacturing process.
- the polymer LED of the present invention can be used as a backlight for a planar light source, a segment display device, a dot matrix display device, and a liquid crystal display device.
- the planar anode and cathode should be arranged so that they overlap each other.
- a method of making non-light emission a method of forming either the anode or the cathode, or both electrodes in a pattern.
- both the anode and the cathode may be formed in stripes and arranged so as to be orthogonal to each other. Partial color display and multi-color display are possible by coating different types of polymeric fluorescent materials with different emission colors or by using color filters or fluorescence conversion filters.
- the dot matrix element can be driven passively or may be driven actively in combination with TFT or the like.
- planar light-emitting element is a self-luminous thin type and can be suitably used as a planar light source for a backlight of a liquid crystal display device or a planar illumination light source. If a flexible substrate is used, it can also be used as a curved light source or display device. Examples are shown below to clarify the present invention in more detail, but the present invention is not limited thereto.
- the number average molecular weight and the weight average molecular weight in terms of polystyrene were determined by GPC (manufactured by Shimadzu Corporation: LC-l OA'v'p).
- the polymer to be measured was dissolved in tetrahydrofuran to a concentration of about 0.5 wt%, and 50 iL was injected into GPC.
- Tetrahydrofuran was used as the mobile phase of GPC, and flowed at a flow rate of 0.6 mL / min.
- 'DB F' could be synthesized by the following method described in JP-A-2004-59899. Benzofuran was placed in a three-necked flask under an inert atmosphere, stirred at room temperature, dissolved, and then heated to 75. After raising the temperature, bromine diluted with acetic acid was added dropwise. After completion of dropping, the mixture was stirred for 3 hours while maintaining the temperature and allowed to cool. After confirming the disappearance of the raw materials by TLC, sodium thiosulfate aqueous solution was added to terminate the reaction, followed by stirring at room temperature for 1 hour. After stirring, the mixture was filtered to separate the cake, further washed with aqueous sodium thiosulfate and water, and dried. The obtained crude product was recrystallized with hexane to obtain Compound A-1. ' Compound A— 1
- reaction mass was poured into a beaker containing concentrated sulfuric acid and water, and toluene was added to terminate the reaction.
- the organic layer was extracted, and water was further added for washing.
- ethyl acetate were put into a four-necked flask, 30% aqueous hydrogen peroxide was added, and the mixture was stirred at 40 for 2 hours.
- This reaction solution was poured into an aqueous solution of ammonium iron (II) sulfate and water in a beaker. After stirring, the organic layer was extracted, and the organic layer was washed with water. By removing the solvent, Compound A-2 was obtained. .
- POZ could be synthesized by the following method described in WO 2004/60970 Pamphlet IV.
- this solution was cooled and then mixed with 40 ml of methanol 40 ml 1 Z ion-exchanged water and stirred for about 1 hour. Next, the produced precipitate was recovered by filtration. Next, this precipitate was dried under reduced pressure and then dissolved in toluene. The toluene solution was filtered to remove insoluble matters, and the toluene solution was purified by passing through a column packed with alumina.
- this toluene solution was washed with 1N aqueous hydrochloric acid, allowed to stand and separated, and then the toluene solution was recovered, then washed with about 5% aqueous ammonia, allowed to stand and separated, The toluene solution was recovered, and then the toluene solution was washed with water, allowed to stand and separated, and then the toluene solution was recovered. Next, this toluene solution was poured into methanol and re-precipitated.
- polymer compound 1 The resulting polystyrene reduced weight-average molecular weight of the polymer compound 1 is 1. a Ox l O 5, the number-average molecular weight, 4. a 4x l 0 4.
- Example 2 The resulting polystyrene reduced weight-average molecular weight of the polymer compound 1 is 1. a Ox l O 5, the number-average molecular weight, 4. a 4x l 0 4.
- a thin film of polymer compound was prepared by spin-coating a 0.8 wt% toluene solution of polymer compound 1 on a quartz plate.
- the fluorescence spectrum of this thin film was measured using a fluorescence spectrophotometer (JOB I NYV ON—SPEX F 1 uor o 1 o g) at an excitation wavelength of 350 nm.
- a fluorescence spectrophotometer (JOB I NYV ON—SPEX F 1 uor o 1 o g) at an excitation wavelength of 350 nm.
- the intensity of the Raman line of water is standardized.
- the fluorescence spectrum plotted with the wavenumber was integrated in the spectrum measurement range, and the value assigned by the absorbance at the excitation wavelength was measured using a spectrophotometer (Varian Cary 5 E).
- Polymer compound 1 had a fluorescence peak wavelength of 468 nm and a fluorescence intensity of 3.9. Comparative Example 1
- polymer compound 2 The resulting polystyrene equivalent Weight average molecular weight of the polymer compound 2, 9. a 4x l 0 4, a number average molecular weight, 2. a 5 xl 0 4. Polymer compound 2 had a fluorescence peak wavelength of 463 nm and a fluorescence intensity of 3.3.
- Example 3 The resulting polystyrene equivalent Weight average molecular weight of the polymer compound 2, 9. a 4x l 0 4, a number average molecular weight, 2. a 5 xl 0 4. Polymer compound 2 had a fluorescence peak wavelength of 463 nm and a fluorescence intensity of 3.3.
- the reaction was terminated by adding 100 ml of 5 wt% sulfuric acid, and the mixture was stirred at room temperature for 12 hours. Water was added for washing, and the organic layer was extracted. After replacing the solvent with ethyl acetate, 30 wt% hydrogen peroxide solution 51 was stirred at 40 ° C. for 5 hours. Thereafter, the organic layer is extracted, washed with a 10% by weight ammonium iron (II) sulfate aqueous solution, dried, and the solvent is removed to obtain the following formula:
- Poly (3, 4) ethylenedioxythiophene Z polystyrene sulfonic acid (Bayer, B.ay tr onP AI 4083) is suspended on a glass substrate with a 150 nm thick ITO film formed by sputtering.
- a solution obtained by filtering the turbid solution through a 0.2 zm membrane filter a film was formed by spin coating at a rotation speed of 3000 rpm. The film thickness after film formation was about 60 nm. Then, it was dried for 10 minutes at 200 on a hot plate.
- the copolymer of the present invention is useful as a light emitting material or a charge transport material, and has excellent device characteristics when an electroluminescent device (polymer LED) is produced. Therefore, the polymer LED containing the copolymer of the present invention can be used for a curved or flat light source, a segment type display element, a dot matrix flat panel display, etc. for backlight or illumination of a liquid crystal display.
- this toluene solution was washed with ion-exchanged water, allowed to stand and separated, and then the toluene solution was recovered.
- this toluene solution was purified through a column filled with alumina. Next, it was poured into this toluene solution methanol to produce a re-precipitate.
- polymer compound 3 had a polystyrene-reduced weight average molecular weight of: 1. l xl O 5 and a number average molecular weight of 1.3 x 10 4 .
- Polymer compound 3 had a fluorescence peak wavelength of 473 nm and a fluorescence intensity of 6.8.
- the organic layer is added dropwise to about 80 mL of methanol to precipitate the polymer.
- the precipitate is filtered and dried to obtain a solid.
- Dissolve this solid in toluene (90 mL) pass the solution through a silica gel / alumina column preliminarily passed through toluene, add this solution dropwise to about 800 mL of methanol to precipitate the polymer, filter the precipitate, dry it, Polymer compound 4 was obtained.
- the polystyrene equivalent weight average molecular weight of the obtained polymer compound 4 is 3.
- Compound D Compound E Polymer compound 4 is prepared from the raw materials:
- a thin film with a thickness of 10 nm was formed by spin and coating using a solution in which polymer compound 4 was dissolved in xylene at a concentration of 0.5 wt%. Dried for 15 minutes.
- film formation was performed at a rotational speed of 2000 rpm by spin coating using a solution in which the polymer compound 3 was dissolved at a concentration of xylene (; ⁇ . 8 wt%).
- the film thickness after the film formation was about 65 Furthermore, this was dried at 8 Ot: under reduced pressure for 1 hour, and barium was deposited at about 5 nm as a cathode, and then aluminum was deposited at about 80 nm to produce an EL device with a vacuum degree of 1 X 10- 4 vapor-deposition of a metal was initiated after reaching the P a below. by the voltage indicia pressure on the resulting device,. EL emission having a peak from the element 475 nm was obtained. Also the The device started emitting light at 4.2 V.
- the copolymer of the present invention is useful as a light emitting material or a charge transport material, and is excellent in device characteristics when an electroluminescence device (polymer L.ED) is produced. Therefore, the polymer LED containing the copolymer of the present invention can be used for a curved or flat light source, a segment type display element, a dot matrix flat panel display and the like for backlight or illumination of a liquid crystal display.
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Description
Claims
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DE112006002668T DE112006002668T5 (de) | 2005-10-07 | 2006-10-03 | Copolymer und polymere lichtemittierende Vorrichtung unter Verwendung desselben |
GB0808120A GB2445519B (en) | 2005-10-07 | 2006-10-03 | Copolymer and polymer light emitting device using the same |
US12/067,959 US7982212B2 (en) | 2005-10-07 | 2006-10-03 | Copolymer and polymer light emitting device using the same |
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- 2006-10-03 DE DE112006002668T patent/DE112006002668T5/de not_active Withdrawn
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- 2006-10-06 JP JP2006274828A patent/JP5076433B2/ja not_active Expired - Fee Related
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WO2007043495A1 (ja) | 2007-04-19 |
KR20080058461A (ko) | 2008-06-25 |
JP2007126652A (ja) | 2007-05-24 |
DE112006002668T5 (de) | 2008-08-14 |
GB2445519B (en) | 2010-11-24 |
GB0808120D0 (en) | 2008-06-11 |
CN101321801A (zh) | 2008-12-10 |
GB2445519A (en) | 2008-07-09 |
JP5076433B2 (ja) | 2012-11-21 |
US7982212B2 (en) | 2011-07-19 |
US20100176376A1 (en) | 2010-07-15 |
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