WO2011099374A1 - 有機電界発光素子 - Google Patents
有機電界発光素子 Download PDFInfo
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- WO2011099374A1 WO2011099374A1 PCT/JP2011/051639 JP2011051639W WO2011099374A1 WO 2011099374 A1 WO2011099374 A1 WO 2011099374A1 JP 2011051639 W JP2011051639 W JP 2011051639W WO 2011099374 A1 WO2011099374 A1 WO 2011099374A1
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- 239000010410 layer Substances 0.000 claims abstract description 144
- PJVZQNVOUCOJGE-CALCHBBNSA-N chembl289853 Chemical compound N1([C@H]2CC[C@H](O2)N2[C]3C=CC=CC3=C3C2=C11)C2=CC=C[CH]C2=C1C1=C3C(=O)N(C)C1=O PJVZQNVOUCOJGE-CALCHBBNSA-N 0.000 claims abstract description 41
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims abstract description 21
- 239000012044 organic layer Substances 0.000 claims abstract description 19
- 239000002019 doping agent Substances 0.000 claims abstract description 16
- 125000003118 aryl group Chemical group 0.000 claims abstract description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 13
- 239000001257 hydrogen Substances 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 125000000623 heterocyclic group Chemical group 0.000 claims abstract description 9
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims abstract description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 34
- 230000000903 blocking effect Effects 0.000 claims description 24
- 125000006615 aromatic heterocyclic group Chemical group 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical group N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 125000001931 aliphatic group Chemical group 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000005401 electroluminescence Methods 0.000 claims description 5
- 229910052757 nitrogen Chemical group 0.000 claims description 4
- 125000001434 methanylylidene group Chemical group [H]C#[*] 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 62
- 150000001875 compounds Chemical class 0.000 abstract description 40
- VVVPGLRKXQSQSZ-UHFFFAOYSA-N indolo[3,2-c]carbazole Chemical compound C1=CC=CC2=NC3=C4C5=CC=CC=C5N=C4C=CC3=C21 VVVPGLRKXQSQSZ-UHFFFAOYSA-N 0.000 abstract description 20
- 125000000217 alkyl group Chemical group 0.000 abstract description 4
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- 125000000753 cycloalkyl group Chemical group 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 21
- 239000007924 injection Substances 0.000 description 21
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- 239000002184 metal Substances 0.000 description 14
- 125000001424 substituent group Chemical group 0.000 description 11
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- IYYZUPMFVPLQIF-UHFFFAOYSA-N dibenzothiophene Chemical compound C1=CC=C2C3=CC=CC=C3SC2=C1 IYYZUPMFVPLQIF-UHFFFAOYSA-N 0.000 description 4
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- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 3
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- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 3
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- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 2
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- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- YQYBUJYBXOVWQW-UHFFFAOYSA-N [3-[4-(aminomethyl)-6-(trifluoromethyl)pyridin-2-yl]oxyphenyl]-(3,4-dihydro-1H-isoquinolin-2-yl)methanone Chemical compound NCC1=CC(=NC(=C1)C(F)(F)F)OC=1C=C(C=CC=1)C(=O)N1CC2=CC=CC=C2CC1 YQYBUJYBXOVWQW-UHFFFAOYSA-N 0.000 description 1
- 229940054051 antipsychotic indole derivative Drugs 0.000 description 1
- YCOXTKKNXUZSKD-UHFFFAOYSA-N as-o-xylenol Natural products CC1=CC=C(O)C=C1C YCOXTKKNXUZSKD-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
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- 150000008366 benzophenones Chemical class 0.000 description 1
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- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
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- 150000001716 carbazoles Chemical class 0.000 description 1
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- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 125000006575 electron-withdrawing group Chemical group 0.000 description 1
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- RMBPEFMHABBEKP-UHFFFAOYSA-N fluorene Chemical compound C1=CC=C2C3=C[CH]C=CC3=CC2=C1 RMBPEFMHABBEKP-UHFFFAOYSA-N 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
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- 150000002475 indoles Chemical class 0.000 description 1
- SNHMUERNLJLMHN-UHFFFAOYSA-N iodobenzene Chemical compound IC1=CC=CC=C1 SNHMUERNLJLMHN-UHFFFAOYSA-N 0.000 description 1
- 150000002503 iridium Chemical class 0.000 description 1
- 125000005647 linker group Chemical group 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000002950 monocyclic group Chemical group 0.000 description 1
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical group C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 1
- KKFHAJHLJHVUDM-UHFFFAOYSA-N n-vinylcarbazole Chemical class C1=CC=C2N(C=C)C3=CC=CC=C3C2=C1 KKFHAJHLJHVUDM-UHFFFAOYSA-N 0.000 description 1
- AODWRBPUCXIRKB-UHFFFAOYSA-N naphthalene perylene Chemical group C1=CC=CC2=CC=CC=C21.C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 AODWRBPUCXIRKB-UHFFFAOYSA-N 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- NIHNNTQXNPWCJQ-UHFFFAOYSA-N o-biphenylenemethane Natural products C1=CC=C2CC3=CC=CC=C3C2=C1 NIHNNTQXNPWCJQ-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- WCPAKWJPBJAGKN-UHFFFAOYSA-N oxadiazole Chemical group C1=CON=N1 WCPAKWJPBJAGKN-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 150000004986 phenylenediamines Chemical class 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- SIOXPEMLGUPBBT-UHFFFAOYSA-M picolinate Chemical compound [O-]C(=O)C1=CC=CC=N1 SIOXPEMLGUPBBT-UHFFFAOYSA-M 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920003227 poly(N-vinyl carbazole) Chemical class 0.000 description 1
- 229920000553 poly(phenylenevinylene) Polymers 0.000 description 1
- 229920000548 poly(silane) polymer Chemical class 0.000 description 1
- 229920002098 polyfluorene Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920000123 polythiophene Chemical class 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 125000000714 pyrimidinyl group Chemical group 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical class C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
- 150000003252 quinoxalines Chemical class 0.000 description 1
- 125000001567 quinoxalinyl group Chemical group N1=C(C=NC2=CC=CC=C12)* 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 125000005504 styryl group Chemical group 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 description 1
- 150000004867 thiadiazoles Chemical class 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
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Definitions
- the present invention relates to an organic electroluminescent device containing an indolocarbazole compound, and more particularly to a thin film device that emits light by applying an electric field to a light emitting layer made of an organic compound.
- an organic electroluminescence element (hereinafter referred to as an organic EL element) has a light emitting layer and a pair of counter electrodes sandwiching the layer as its simplest structure. That is, in an organic EL element, when an electric field is applied between both electrodes, electrons are injected from the cathode, holes are injected from the anode, and these are recombined in the light emitting layer to emit light. .
- CBP 4,4′-bis (9-carbazolyl) biphenyl
- Ir (ppy) 3 2,4′-bis (9-carbazolyl) biphenyl
- a host material having high triplet excitation energy and balanced in both charge (hole / electron) injection and transport characteristics is required. Further, a compound that is electrochemically stable and has high heat resistance and excellent amorphous stability is desired, and further improvement is required.
- Patent Document 3 an indolocarbazole compound as shown below is disclosed as a hole transport material.
- Patent Document 4 discloses an indolocarbazole compound as shown below as a hole transport material.
- Patent Document 5 discloses an indolocarbazole compound as shown below.
- the above compound is a compound in which an aromatic heterocycle is directly substituted on nitrogen of an indolocarbazole skeleton, and does not disclose a compound having an aromatic hydrocarbon as a linking group.
- An object of this invention is to provide the practically useful organic EL element which has high efficiency and high drive stability in view of the said present condition, and a compound suitable for it.
- the present invention provides an organic electroluminescent device in which an anode, an organic layer including a phosphorescent light emitting layer and a cathode are laminated on a substrate, and at least one selected from the group consisting of a light emitting layer, an electron transport layer and a hole blocking layer.
- the organic layer contains an indolocarbazole compound represented by the general formula (1) in an organic layer.
- ring A represents the aromatic ring or heterocyclic ring represented by formula (1a) that is condensed with an adjacent ring at an arbitrary position
- ring B is condensed with an adjacent ring at an arbitrary position
- the heterocyclic ring represented by Formula (1b) is represented.
- a 1 and A 2 each independently represent an aromatic hydrocarbon group having 6 to 50 carbon atoms
- B 1 and B 2 each independently represent carbon.
- X represents methine or nitrogen
- R 1 and R 2 each independently represents hydrogen, an aliphatic hydrocarbon group of 1 to 10 carbon atoms, 6 to 12 carbon atoms Or an aromatic heterocyclic group having 3 to 11 carbon atoms, wherein R 3 is hydrogen, an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an aromatic hydrocarbon group having 6 to 12 carbon atoms, or An aromatic heterocyclic group having 3 to 11 carbon atoms, which may be condensed with a ring containing X to form a condensed ring; m represents an integer of 1 to 3, and n represents an integer of 0 to 3. When m and n are 2 or more, the plurality of B 1 and B 2 may be the same or different.
- indolocarbazole compounds represented by general formula (1) indolocarbazole compounds represented by any of the following general formulas (2) to (5) are preferred compounds.
- a 1 , A 2 , B 1 , B 2 , R 1 to R 3 , m and n are the same as those in the general formula (1).
- indolocarbazole compounds represented by any one of the general formulas (2) to (5) indolocarbazole compounds represented by any one of the following general formulas (6) to (9) are more preferable compounds. Can be mentioned.
- the organic layer containing the indolocarbazole compound is a light emitting layer containing a phosphorescent dopant.
- an organic layer containing an indolocarbazole compound includes a phosphorescent dopant having a maximum emission wavelength at 440 nm to 510 nm and an indolocarbazole compound represented by either general formula (4) or (5).
- a layer is preferred.
- the indolocarbazole compound represented by the general formula (1) has excellent injecting and transporting holes and electrons by connecting the indolocarbazole skeleton and at least one aromatic heterocycle with an aromatic hydrocarbon group. It is considered to exhibit properties and high durability.
- the organic EL device using this has a low driving voltage.
- this indolocarbazole compound is contained in the light emitting layer, the recombination probability is improved because the balance of both charges is improved, and high minimum excitation is achieved. Since it has the energy of the triplet state, it has the characteristics that the transfer of triplet excitation energy from the dopant to the host molecule can be effectively suppressed, and is considered to give excellent light emission characteristics.
- since it exhibits good amorphous characteristics and high thermal stability and is electrochemically stable it is considered that an organic EL element having a long driving life and high durability can be realized.
- the organic electroluminescent device of the present invention contains an indolocarbazole compound represented by the general formula (1).
- This indolocarbazole compound has a structure in which two nitrogen atoms are substituted with aromatic hydrocarbons, and one of them is substituted with at least one aromatic heterocyclic ring.
- ring A represents the aromatic ring or heterocyclic ring represented by formula (1a) that is condensed with an adjacent ring at an arbitrary position
- ring B is condensed with an adjacent ring at an arbitrary position
- the heterocyclic ring represented by Formula (1b) is represented.
- a 1 and A 2 each independently represents an aromatic hydrocarbon group having 6 to 50 carbon atoms.
- An aromatic hydrocarbon group having 6 to 30 carbon atoms is preferable, and an aromatic hydrocarbon group having 6 to 18 carbon atoms is more preferable.
- a 1 is an m + 1 valent aromatic hydrocarbon group
- a 2 is an n + 1 valent aromatic hydrocarbon group.
- Specific examples of A 1 and A 2 include benzene, naphthalene, fluorene, anthracene, phenanthrene, fluoranthene, pyrene, chrysene, or an m + 1-valent or n + 1-valent group generated by removing hydrogen from an aromatic compound in which a plurality of these are connected. Can be mentioned.
- the total number of carbon atoms is 10 to 50.
- Preferred are benzene, naphthalene, anthracene and phenanthrene, and more preferred is benzene.
- a plurality of the aromatic compounds are connected, they may be the same or different.
- the aromatic ring is a group derived from an aromatic compound in which a plurality of aromatic rings are connected, the number connected is preferably 2 to 5, more preferably 2 or 3.
- Specific examples of the group formed by removing hydrogen from the above-described aromatic compounds linked to each other include biphenyl, terphenyl, phenylnaphthalene, diphenylnaphthalene, phenylanthracene, diphenylanthracene, diphenylfluorene, and the like.
- the connection position between A 1 and indolocarbazole and B 1 is not limited, and it may be a terminal ring or a central ring.
- the aromatic hydrocarbon group may have a substituent. When the aromatic hydrocarbon group has a substituent, preferred substituents are an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 2 carbon atoms, and an acetyl group. .
- a group generated from an aromatic compound in which a plurality of aromatic rings are connected is a divalent group, for example, represented by the following formulas (11) to (13).
- Ar 1 to Ar 6 represent an unsubstituted monocyclic or condensed aromatic ring
- a 1 , A 2 , B 1 , B 2 and R 1 to R 3 are an aromatic hydrocarbon group, an aromatic heterocyclic group, or an aliphatic hydrocarbon group and have a substituent
- the total number is 1-10. Preferably it is 1-6, more preferably 1-4. Moreover, when it has two or more substituents, they may be the same or different.
- the carbon number of the substituent is included.
- B 1 and B 2 each independently represents a monovalent aromatic heterocyclic group having 3 to 50 carbon atoms. Preferred is an aromatic heterocyclic group having 3 to 30 carbon atoms, and more preferred is an aromatic heterocyclic group having 3 to 17 carbon atoms. However, neither B 1 nor B 2 becomes an indolocarbazolyl group. When a plurality of aromatic heterocycles are linked, the total number of carbon atoms is 6-50.
- B 1 and B 2 include pyrrole, pyridine, pyrimidine, triazine, indole, quinoline, isoquinoline, quinoxaline, naphthyridine, carbazole, acridine, furan, benzofuran, dibenzofuran, thiophene, benzothiophene, dibenzothiophene, or a combination thereof.
- a monovalent group generated from the aromatic compound formed Preferable examples include monovalent groups formed from pyridine, pyrimidine, triazine, carbazole, dibenzofuran, and dibenzothiophene. When a plurality of the aromatic compounds are connected, they may be the same or different.
- the aromatic ring is a group derived from an aromatic compound in which a plurality of aromatic rings are connected, the number connected is preferably 2 to 5, more preferably 2 or 3.
- Specific examples of the group generated by removing hydrogen from the above-described aromatic compounds linked to each other include bipyridine, bipyrimidine, vitriazine, pyridylpyrimidine, pyridylcarbazole, pyrimidylcarbazole and the like.
- the aromatic heterocyclic ring may have a substituent, and when it has a substituent, preferred substituents include an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 2 carbon atoms, an acetyl group, a carbon number 6 to 12 aromatic hydrocarbon groups. More preferably, they are a phenyl group and a naphthyl group.
- n represents an integer of 1 to 3.
- B 1 may be the same or different.
- n represents an integer of 0 to 3.
- n is an integer of 0-2.
- B 2 may be the same or different.
- m + n is preferably 1 to 3.
- R 1 and R 2 are each independently hydrogen, an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an aromatic hydrocarbon group having 6 to 12 carbon atoms, or an aromatic group having 3 to 11 carbon atoms. Represents a heterocyclic group.
- Preferred are hydrogen, an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a phenyl group, a naphthyl group, a pyridyl group, a pyrimidyl group, a triazyl group, and a carbazolyl group. More preferably, they are hydrogen, a phenyl group, and a carbazolyl group.
- R 3 is hydrogen, an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an aromatic hydrocarbon group having 6 to 12 carbon atoms, an aromatic heterocyclic group having 3 to 11 carbon atoms, or
- X represents a group condensed with a ring containing When the ring is fused to a six-membered ring containing X in formula (1a), this ring may be a condensed ring.
- an indole ring is preferable, and in this case, diindolocarbazole is formed. At this time, the indole ring may have a substituent.
- the indolocarbazole compounds represented by the general formula (1) are mentioned as preferred compounds, and the above general formulas (6) to (9) ) Is a more preferred compound.
- Indolocarbazole compounds represented by the general formulas (1) to (9) can be synthesized by selecting a raw material according to the structure of the target compound and using a known method.
- indolocarbazole skeleton represented by the general formula (2) or (6) is described below with reference to the synthesis example shown in Archiv der Pharmazie (Weinheim, Germany), 1987, 320 (3), p280-2. It can be synthesized by the reaction formula of
- the indolocarbazole skeleton of the indolocarbazole compound represented by the general formula (3) or (7) is Synlett, 2005, No. 1; 1, p42-48 can be synthesized according to the following reaction formula with reference to the synthesis example.
- the indolocarbazole skeleton of the indolocarbazole compound represented by the general formula (4), (5), (8) or (9) includes The ⁇ Journal of Organic Chemistry, 2007, 72 (15) 5886 and Tetrahedron. , 1999, 55, p2371, and can be synthesized according to the following reaction formula.
- the indolocarbazole compounds represented by the general formulas (1) to (9) are obtained by substituting hydrogen on nitrogen of each indolocarbazole skeleton obtained by the above reaction formula with a corresponding aromatic group according to a conventional method. Can be synthesized.
- indolocarbazole compounds represented by the general formulas (1) to (9) are shown below, but the materials used for the organic electroluminescence device of the present invention are not limited thereto.
- Indolocarbazole compound represented by general formula (1) or any one of general formulas (2) to (9) (hereinafter, indolocarbazole compound of the present invention or indolocarbazole compound represented by general formula (1)) Is also provided in at least one organic layer of an organic EL device in which an anode, a plurality of organic layers and a cathode are laminated on a substrate, thereby giving an excellent organic electroluminescence device.
- the organic layer to be contained is a light emitting layer, an electron transport layer or a hole blocking layer. More preferably, it may be contained as a host material of a light emitting layer containing a phosphorescent dopant.
- the organic EL device of the present invention has an organic layer having at least one light emitting layer between an anode and a cathode laminated on a substrate, and at least selected from a light emitting layer, an electron transport layer, or a hole blocking layer.
- One organic layer contains the indolocarbazole compound of the present invention.
- the indolocarbazole compound of the present invention is included in the light emitting layer together with a phosphorescent dopant.
- the structure of the organic EL element of the present invention will be described with reference to the drawings.
- the structure of the organic EL element of the present invention is not limited to the illustrated one.
- FIG. 1 is a cross-sectional view showing a structural example of a general organic EL device used in the present invention, wherein 1 is a substrate, 2 is an anode, 3 is a hole injection layer, 4 is a hole transport layer, and 5 is a light emitting layer. , 6 represents an electron transport layer, and 7 represents a cathode.
- the organic EL device of the present invention may have an exciton blocking layer adjacent to the light emitting layer, and may have an electron blocking layer between the light emitting layer and the hole injection layer.
- the exciton blocking layer can be inserted on either the anode side or the cathode side of the light emitting layer, or both can be inserted simultaneously.
- the organic EL device of the present invention has a substrate, an anode, a light emitting layer and a cathode as essential layers, but it is preferable to have a hole injecting and transporting layer and an electron injecting and transporting layer in layers other than the essential layers, and further emit light. It is preferable to have a hole blocking layer between the layer and the electron injecting and transporting layer.
- the hole injection / transport layer means either or both of a hole injection layer and a hole transport layer
- the electron injection / transport layer means either or both of an electron injection layer and an electron transport layer.
- the organic EL element of the present invention is preferably supported on a substrate.
- the substrate is not particularly limited as long as it is conventionally used for an organic EL element.
- a substrate made of glass, transparent plastic, quartz, or the like can be used.
- an electrode material made of a metal, an alloy, an electrically conductive compound, or a mixture thereof having a high work function (4 eV or more) is preferably used.
- electrode materials include metals such as Au, and conductive transparent materials such as CuI, indium tin oxide (ITO), SnO 2 and ZnO.
- conductive transparent materials such as CuI, indium tin oxide (ITO), SnO 2 and ZnO.
- an amorphous material such as IDIXO (In 2 O 3 —ZnO) that can form a transparent conductive film may be used.
- these electrode materials may be formed into a thin film by a method such as vapor deposition or sputtering, and a pattern having a desired shape may be formed by a photolithography method, or when the pattern accuracy is not required (about 100 ⁇ m or more) ), A pattern may be formed through a mask having a desired shape when the electrode material is deposited or sputtered. Or when using the substance which can be apply
- the cathode a material having a low work function (4 eV or less) metal (referred to as an electron injecting metal), an alloy, an electrically conductive compound, and a mixture thereof as an electrode material is used.
- an electron injecting metal a material having a low work function (4 eV or less) metal
- an alloy a material having a low work function (4 eV or less) metal
- an alloy a material having a low work function (4 eV or less) metal
- an alloy referred to as an electron injecting metal
- an alloy referred to as an electron injecting metal
- a mixture of an electron injecting metal and a second metal which is a stable metal having a larger work function than this for example, a magnesium / silver mixture
- Suitable are a magnesium / aluminum mixture, a magnesium / indium mixture, an aluminum / aluminum oxide (Al 2 O 3 ) mixture, a lithium / aluminum mixture, aluminum and the like.
- the cathode can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering.
- the sheet resistance as the cathode is preferably several hundred ⁇ / ⁇ or less, and the film thickness is usually selected in the range of 10 nm to 5 ⁇ m, preferably 50 to 200 nm.
- the light emission luminance is improved, which is convenient.
- a transparent or semi-transparent cathode can be produced by producing the conductive transparent material mentioned in the description of the anode on the cathode after producing the metal with a thickness of 1 to 20 nm on the cathode.
- an element in which both the anode and the cathode are transmissive can be manufactured.
- the light emitting layer is a phosphorescent light emitting layer and includes a phosphorescent dopant and a host material.
- the phosphorescent dopant material preferably contains an organometallic complex containing at least one metal selected from ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum and gold. Such organometallic complexes are known in the prior art documents and the like, and these can be selected and used.
- Preferable phosphorescent dopants include complexes such as Ir (ppy) 3 having a noble metal element such as Ir as a central metal, complexes such as (Bt) 2 Iracac, and complexes such as (Btp) Ptacac. Specific examples of these complexes are shown below, but are not limited to the following compounds.
- the amount of phosphorescent dopant contained in the light emitting layer is preferably in the range of 1 to 50% by weight. More preferably, it is 5 to 30% by weight.
- the host material in the light emitting layer it is preferable to use an indolocarbazole compound represented by the general formula (1).
- the material used for the light emitting layer may be a host material other than the indolocarbazole compound.
- An indolocarbazole compound and another host material may be used in combination.
- a plurality of known host materials may be used in combination.
- a known host compound that can be used is preferably a compound that has a hole transporting ability or an electron transporting ability, prevents the emission of light from becoming longer, and has a high glass transition temperature.
- host materials are known from a large number of patent documents and can be selected from them.
- Specific examples of the host material are not particularly limited, but include indole derivatives, carbazole derivatives, triazole derivatives, oxazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine.
- arylamine derivatives amino-substituted chalcone derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aromatic tertiary amine compounds, styrylamine compounds, aromatic dimethylidene compounds, porphyrin compounds, anthraquino Heterocyclic tetracarboxylic acid anhydrides such as dimethane derivatives, anthrone derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, naphthalene perylene,
- metal complexes typified by metal complexes of Russianine derivatives, 8-quinolinol derivatives, metal phthalocyanines, metal complexes of benzoxazole and benzothiazole derivatives, polysilane compounds, poly (N-vinylcarbazole) derivatives, aniline copolymers, Examples thereof include polymer compounds such
- the injection layer is a layer provided between the electrode and the organic layer for lowering the driving voltage and improving the luminance of light emission.
- the injection layer can be provided as necessary.
- the hole blocking layer has a function of an electron transport layer in a broad sense, and is made of a hole blocking material that has a function of transporting electrons and has a remarkably small ability to transport holes. The probability of recombination of electrons and holes can be improved by blocking.
- the indolocarbazole compound represented by the general formula (1) for the hole blocking layer.
- a known hole blocking layer is used. Materials may be used.
- a hole-blocking layer material the material of the electron carrying layer mentioned later can be used as needed.
- the electron blocking layer is made of a material that has a function of transporting holes and has a very small ability to transport electrons.
- the electron blocking layer blocks the electrons while transporting holes, and the probability of recombination of electrons and holes. Can be improved.
- the thickness of the electron blocking layer is preferably 3 to 100 nm, more preferably 5 to 30 nm.
- the exciton blocking layer is a layer for preventing excitons generated by recombination of holes and electrons in the light emitting layer from diffusing into the charge transport layer. It becomes possible to efficiently confine in the light emitting layer, and the light emission efficiency of the device can be improved.
- the exciton blocking layer can be inserted on either the anode side or the cathode side adjacent to the light emitting layer, or both can be inserted simultaneously.
- Examples of the material for the exciton blocking layer include 1,3-dicarbazolylbenzene (mCP) and bis (2-methyl-8-quinolinolato) -4-phenylphenolato aluminum (III) (BAlq). It is done.
- mCP 1,3-dicarbazolylbenzene
- BAlq bis (2-methyl-8-quinolinolato) -4-phenylphenolato aluminum
- the hole transport layer is made of a hole transport material having a function of transporting holes, and the hole transport layer can be provided as a single layer or a plurality of layers.
- the hole transport material has either hole injection or transport or electron barrier properties, and may be either organic or inorganic.
- Examples of known hole transport materials that can be used include triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, Examples include styryl anthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aniline copolymers, and conductive polymer oligomers, particularly thiophene oligomers. Porphyrin compounds, aromatic tertiary amine compounds, and styryl. It is preferable to use an amine compound, and it is more preferable to use an aromatic tertiary amine compound.
- the electron transport layer is made of a material having a function of transporting electrons, and the electron transport layer can be provided as a single layer or a plurality of layers.
- an electron transport material which may also serve as a hole blocking material
- an indolocarbazole derivative represented by the general formula (1) for the electron transport layer, any one of conventionally known compounds can be selected and used.
- a nitro-substituted fluorene derivative Diphenylquinone derivatives, thiopyran dioxide derivatives, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, oxadiazole derivatives, and the like.
- a thiadiazole derivative in which the oxygen atom of the oxadiazole ring is substituted with a sulfur atom, and a quinoxaline derivative having a quinoxaline ring known as an electron withdrawing group can also be used as an electron transport material.
- a polymer material in which these materials are introduced into a polymer chain or these materials are used as a polymer main chain can also be used.
- the indolocarbazole compound used in the present invention was synthesized by the route shown below.
- the compound number corresponds to the number assigned to the above chemical formula.
- Example 1 Each thin film was laminated at a vacuum degree of 4.0 ⁇ 10 ⁇ 5 Pa by a vacuum deposition method on a glass substrate on which an anode made of ITO having a thickness of 110 nm was formed.
- copper phthalocyanine (CuPC) was formed to a thickness of 25 nm on ITO.
- NPB 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl
- compound 3-1 obtained in Synthesis Example 1 as a host material, tris (2-phenylpyridine) iridium (III) (Ir (ppy) 3 ) as a phosphorescent dopant, and Were co-deposited from different deposition sources to form a light emitting layer with a thickness of 40 nm.
- the concentration of Ir (ppy) 3 in the light emitting layer was 10.0 wt%.
- tris (8-hydroxyquinolinato) aluminum (III) (Alq3) was formed to a thickness of 20 nm as an electron transport layer.
- lithium fluoride (LiF) was formed to a thickness of 1.0 nm as an electron injection layer.
- aluminum (Al) was formed as an electrode to a thickness of 70 nm to produce an organic EL element.
- Example 2 An organic EL device was produced in the same manner as in Example 1 except that Compound 1-11 was used as the host material for the light emitting layer.
- Example 3 An organic EL device was produced in the same manner as in Example 1 except that Compound 1-15 was used as the host material for the light emitting layer.
- Example 4 An organic EL device was produced in the same manner as in Example 1 except that Compound 2-6 was used as the host material for the light emitting layer.
- Example 5 An organic EL device was produced in the same manner as in Example 1 except that Compound 2-30 was used as the host material for the light emitting layer.
- Example 6 An organic EL device was produced in the same manner as in Example 1 except that Compound 3-3 was used as the host material for the light emitting layer.
- Example 7 An organic EL device was produced in the same manner as in Example 1 except that Compound 3-13 was used as the host material for the light emitting layer.
- Example 8 An organic EL device was produced in the same manner as in Example 1 except that Compound 3-23 was used as the host material for the light emitting layer.
- Example 9 An organic EL device was produced in the same manner as in Example 1 except that Compound 4-3 was used as the host material for the light emitting layer.
- Comparative Example 1 An organic EL device was produced in the same manner as in Example 1 except that 4,4′-bis (9-carbazolyl) biphenyl (CBP) was used as the host material for the light emitting layer.
- CBP 4,4′-bis (9-carbazolyl) biphenyl
- Comparative Example 2 An organic EL device was produced in the same manner as in Example 1 except that the following compound H-1 was used as the host material for the light emitting layer.
- Comparative Example 3 An organic EL device was produced in the same manner as in Example 1 except that the following compound H-2 was used as the host material for the light emitting layer.
- Table 1 shows that the indolocarbazole compound used in the organic EL device of the present invention exhibits good emission characteristics with respect to CBP generally known as a phosphorescent host.
- the indolocarbazole compound exhibits excellent light emission characteristics compared to H-1 in which an aromatic heterocyclic ring is directly bonded to indolocarbazole and H-2 having no aromatic heterocyclic compound in the molecule. The advantage of is clear.
- Example 10 Each thin film was laminated at a vacuum degree of 2.0 ⁇ 10 ⁇ 5 Pa by a vacuum deposition method on a glass substrate on which an anode made of ITO having a thickness of 110 nm was formed. First, copper phthalocyanine (CuPC) was formed to a thickness of 25 nm on ITO as a hole injection layer. Next, NPB was formed to a thickness of 90 nm as a hole transport layer.
- CuPC copper phthalocyanine
- compound 3-1 as a host material of the light emitting layer and an iridium complex [iridium (III) bis (4,6-di-fluorophenyl) -pyridinate as a blue phosphorescent material as a dopant -N, C2 ′] picolinate] (FIrpic) were co-deposited from different deposition sources to form a light emitting layer with a thickness of 30 nm. The concentration of FIrpic was 10 wt%.
- Alq3 was formed to a thickness of 30 nm as an electron transport layer.
- LiF was formed to a thickness of 1.0 nm as an electron injection layer on the electron transport layer.
- Al was formed as an electrode to a thickness of 70 nm on the electron injection layer.
- the obtained organic EL device has a layer structure in which an electron injection layer is added between the cathode and the electron transport layer in the organic EL device shown in FIG.
- Example 11 An organic EL device was produced in the same manner as in Example 10 except that Compound 3-4 was used as the host material for the light emitting layer.
- Example 12 An organic EL device was produced in the same manner as in Example 10 except that Compound 3-23 was used as the host material for the light emitting layer.
- Comparative Example 4 An organic EL device was produced in the same manner as in Example 10 except that CBP was used as the host material of the light emitting layer.
- Comparative Example 5 An organic EL device was produced in the same manner as in Example 10 except that H-1 was used as the host material for the light emitting layer.
- Table 2 also shows that the organic EL elements of the examples show better light emission characteristics than the organic EL elements of the comparative examples, which shows the superiority of the present invention.
- the organic EL device according to the present invention has practically satisfactory levels in terms of light emission characteristics, driving life and durability, flat panel display (mobile phone display device, in-vehicle display device, OA computer display device, television, etc.), surface light emission, etc. Its technical value is great in applications to light sources (lighting, light sources for copying machines, backlight light sources for liquid crystal displays and instruments), display boards, and sign lamps that make use of the characteristics of the body.
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Abstract
Description
nは0~3の整数を表す。好ましくは、nは0~2の整数である。nが2以上の場合、B2は同一であっても異なっていても良い。ここで、m+nは1~3であることが好ましい。
本発明の有機EL素子は、基板に支持されていることが好ましい。この基板については、特に制限はなく、従来から有機EL素子に慣用されているものであればよく、例えば、ガラス、透明プラスチック、石英などからなるものを用いることができる。
有機EL素子における陽極としては、仕事関数の大きい(4eV以上)金属、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが好ましく用いられる。このような電極物質の具体例としてはAu等の金属、CuI、インジウムチンオキシド(ITO)、SnO2、ZnO等の導電性透明材料が挙げられる。また、IDIXO(In2O3-ZnO)等非晶質で透明導電膜を作製可能な材料を用いてもよい。陽極はこれらの電極物質を蒸着やスパッタリング等の方法により、薄膜を形成させ、フォトリソグラフィー法で所望の形状のパターンを形成してもよく、あるいはパターン精度をあまり必要としない場合は(100μm以上程度)、上記電極物質の蒸着やスパッタリング時に所望の形状のマスクを介してパターンを形成してもよい。あるいは、有機導電性化合物のように塗布可能な物質を用いる場合には、印刷方式、コーティング方式等湿式成膜法を用いることもできる。この陽極より発光を取り出す場合には、透過率を10%より大きくすることが望ましく、また陽極としてのシート抵抗は数百Ω/□以下が好ましい。更に膜厚は材料にもよるが、通常10~1000nm、好ましくは10~200nmの範囲で選ばれる。
一方、陰極としては、仕事関数の小さい(4eV以下)金属(電子注入性金属と称する)、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが用いられる。このような電極物質の具体例としては、ナトリウム、ナトリウム-カリウム合金、マグネシウム、リチウム、マグネシウム/銅混合物、マグネシウム/銀混合物、マグネシウム/アルミニウム混合物、マグネシウム/インジウム混合物、アルミニウム/酸化アルミニウム(Al2O3)混合物、インジウム、リチウム/アルミニウム混合物、希土類金属等が挙げられる。これらの中で、電子注入性及び酸化等に対する耐久性の点から、電子注入性金属とこれより仕事関数の値が大きく安定な金属である第二金属との混合物、例えば、マグネシウム/銀混合物、マグネシウム/アルミニウム混合物、マグネシウム/インジウム混合物、アルミニウム/酸化アルミニウム(Al2O3)混合物、リチウム/アルミニウム混合物、アルミニウム等が好適である。陰極はこれらの電極物質を蒸着やスパッタリング等の方法により薄膜を形成させることにより、作製することができる。また、陰極としてのシート抵抗は数百Ω/□以下が好ましく、膜厚は通常10nm~5μm、好ましくは50~200nmの範囲で選ばれる。なお、発光した光を透過させるため、有機EL素子の陽極又は陰極のいずれか一方が、透明又は半透明であれば発光輝度が向上し好都合である。
発光層は燐光発光層であり、燐光発光ドーパントとホスト材料を含む。燐光発光ドーパント材料としては、ルテニウム、ロジウム、パラジウム、銀、レニウム、オスミウム、イリジウム、白金及び金から選ばれる少なくとも一つの金属を含む有機金属錯体を含有するものがよい。かかる有機金属錯体は、前記先行技術文献等で公知であり、これらが選択されて使用可能である。
注入層とは、駆動電圧低下や発光輝度向上のために電極と有機層間に設けられる層のことで、正孔注入層と電子注入層があり、陽極と発光層又は正孔輸送層の間、及び陰極と発光層又は電子輸送層との間に存在させてもよい。注入層は必要に応じて設けることができる。
正孔阻止層とは広い意味では電子輸送層の機能を有し、電子を輸送する機能を有しつつ正孔を輸送する能力が著しく小さい正孔阻止材料からなり、電子を輸送しつつ正孔を阻止することで電子と正孔の再結合確率を向上させることができる。
電子阻止層とは、正孔を輸送する機能を有しつつ電子を輸送する能力が著しく小さい材料から成り、正孔を輸送しつつ電子を阻止することで電子と正孔が再結合する確率を向上させることができる。
励起子阻止層とは、発光層内で正孔と電子が再結合することにより生じた励起子が電荷輸送層に拡散することを阻止するための層であり、本層の挿入により励起子を効率的に発光層内に閉じ込めることが可能となり、素子の発光効率を向上させることができる。励起子阻止層は発光層に隣接して陽極側、陰極側のいずれにも挿入することができ、両方同時に挿入することも可能である。
正孔輸送層とは正孔を輸送する機能を有する正孔輸送材料からなり、正孔輸送層は単層又は複数層設けることができる。
電子輸送層とは電子を輸送する機能を有する材料からなり、電子輸送層は単層又は複数層設けることができる。
化合物3-1の合成
APCI-TOFMS, m/z 638 [M+H]+ 、1H-NMR測定結果(測定溶媒:THF-d8)を図2に示す。
APCI-TOFMS, m/z 867 [M+H]+ 、1H-NMR測定結果(測定溶媒:THF-d8)を図3に示す。
膜厚110 nmのITOからなる陽極が形成されたガラス基板上に、各薄膜を真空蒸着法にて、真空度4.0×10-5Paで積層させた。まず、ITO上に銅フタロシアニン(CuPC)を25 nmの厚さに形成した。次に、正孔輸送層として4,4'-ビス[N-(1-ナフチル)-N-フェニルアミノ]ビフェニル(NPB)を40 nmの厚さに形成した。次に、正孔輸送層上に、ホスト材料としての合成例1で得た化合物3-1と、燐光発光ドーパントとしてのトリス(2‐フェニルピリジン)イリジウム(III)(Ir(ppy)3)とを異なる蒸着源から、共蒸着し、40 nmの厚さに発光層を形成した。発光層中のIr(ppy)3の濃度は10.0 wt%であった。次に、電子輸送層としてトリス(8-ヒドロキシキノリナト)アルミニウム(III)(Alq3)を20 nmの厚さに形成した。更に、電子輸送層上に、電子注入層としてフッ化リチウム(LiF)を1.0 nmの厚さに形成した。最後に、電子注入層上に、電極としてアルミニウム(Al)を70 nmの厚さに形成し、有機EL素子を作製した。
発光層のホスト材料として、化合物1-11を用いた以外は実施例1と同様にして有機EL素子を作製した。
発光層のホスト材料として、化合物1-15を用いた以外は実施例1と同様にして有機EL素子を作製した。
発光層のホスト材料として、化合物2-6を用いた以外は実施例1と同様にして有機EL素子を作製した。
発光層のホスト材料として、化合物2-30を用いた以外は実施例1と同様にして有機EL素子を作製した。
発光層のホスト材料として、化合物3-3を用いた以外は実施例1と同様にして有機EL素子を作製した。
発光層のホスト材料として、化合物3-13を用いた以外は実施例1と同様にして有機EL素子を作製した。
発光層のホスト材料として、化合物3-23を用いた以外は実施例1と同様にして有機EL素子を作製した。
発光層のホスト材料として、化合物4-3を用いた以外は実施例1と同様にして有機EL素子を作製した。
発光層のホスト材料として、4,4'-ビス(9-カルバゾリル)ビフェニル(CBP)を用いた以外は実施例1と同様にして有機EL素子を作製した。
発光層のホスト材料として、下記化合物H-1を用いた以外は実施例1と同様にして有機EL素子を作製した。
発光層のホスト材料として、下記化合物H-2を用いた以外は実施例1と同様にして有機EL素子を作製した。
膜厚 110 nm のITOからなる陽極が形成されたガラス基板上に、各薄膜を真空蒸着法にて、真空度 2.0×10-5 Pa で積層させた。まず、ITO 上に正孔注入層として、銅フタロシアニン(CuPC)を 25 nm の厚さに形成した。次に、正孔輸送層としてNPBを90 nm の厚さに形成した。次に、正孔輸送層上に、発光層のホスト材料としての化合物3-1とドーパントとしての青色燐光材料であるイリジウム錯体[イリジウム(III)ビス(4,6-ジ-フルオロフェニル)-ピリジネート-N,C2']ピコリネート](FIrpic)とを異なる蒸着源から、共蒸着し、30 nm の厚さに発光層を形成した。FIrpicの濃度は 10 wt%であった。次に、電子輸送層として Alq3 を 30 nm厚さに形成した。更に、電子輸送層上に、電子注入層としてLiFを 1.0 nm厚さに形成した。最後に、電子注入層上に、電極としてAlを70 nm厚さに形成した。得られた有機EL素子は、図1に示す有機EL素子において、陰極と電子輸送層の間に、電子注入層が追加された層構成を有する。
発光層のホスト材料として、化合物3-4を用いた以外は実施例10と同様にして有機EL素子を作製した。
発光層のホスト材料として、化合物3-23を用いた以外は実施例10と同様にして有機EL素子を作製した。
発光層のホスト材料として、CBPを用いた以外は実施例10と同様にして有機EL素子を作製した。
発光層のホスト材料として、H-1を用いた以外は実施例10と同様にして有機EL素子を作製した。
Claims (5)
- 基板上に、陽極、燐光発光層を含む有機層及び陰極が積層されてなる有機電界発光素子において、発光層、電子輸送層及び正孔阻止層からなる群れから選ばれる少なくとも一つの有機層中に、一般式(1)で表されるインドロカルバゾール化合物を含有することを特徴とする有機電界発光素子。
一般式(1)中、環Aは隣接環と任意の位置で縮合する式(1a)で表される芳香族環又は複素環を示し、環Bは隣接環と任意の位置で縮合する式(1b)で表される複素環を表す。一般式(1)、(1a)及び(1b)中、A1及びA2はそれぞれ独立して炭素数6~50の芳香族炭化水素基を表し、B1及びB2はそれぞれ独立して炭素数3~50の芳香族複素環基を表し、Xはメチン又は窒素を表し、R1及びR2はそれぞれ独立に、水素、炭素数1~10の脂肪族炭化水素基、炭素数6~12の芳香族炭化水素基又は炭素数3~11の芳香族複素環基を示し、R3は水素、炭素数1~10の脂肪族炭化水素基、炭素数6~12の芳香族炭化水素基又は炭素数3~11の芳香族複素環基を示し、Xを含む環と縮合して縮合環を形成しても良い。mは1~3の整数を表し、nは0~3の整数を表す。m、nが2以上の場合、複数のB1及びB2はそれぞれ同一でも異なっていても良い。 - インドロカルバゾール化合物を含む有機層が、燐光発光ドーパントを含有する発光層であることを特徴とする請求項1~3のいずれかに記載の有機電界発光素子。
- インドロカルバゾール化合物を含む有機層が、440nm~510nmに最大発光波長を有する燐光発光ドーパントを含有し、かつ一般式(4)又は(5)で表されるインドロカルバゾール化合物を含有する発光層であることを特徴とする請求項2に記載の有機電界発光素子。
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US13/577,238 US9156843B2 (en) | 2010-02-12 | 2011-01-27 | Organic electroluminescent device comprising an organic layer containing an indolocarbazole compound |
CN201180008997.XA CN102754237B (zh) | 2010-02-12 | 2011-01-27 | 有机电致发光元件 |
KR1020127023471A KR101313730B1 (ko) | 2010-02-12 | 2011-01-27 | 유기 전계 발광 소자 |
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US20120305903A1 (en) | 2012-12-06 |
TW201136933A (en) | 2011-11-01 |
JPWO2011099374A1 (ja) | 2013-06-13 |
TWI429650B (zh) | 2014-03-11 |
US9156843B2 (en) | 2015-10-13 |
CN102754237B (zh) | 2015-06-17 |
JP5215481B2 (ja) | 2013-06-19 |
EP2535957A1 (en) | 2012-12-19 |
KR101313730B1 (ko) | 2013-10-01 |
KR20120125368A (ko) | 2012-11-14 |
EP2535957B1 (en) | 2017-01-04 |
CN102754237A (zh) | 2012-10-24 |
EP2535957A4 (en) | 2014-09-24 |
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