WO2011052186A1 - フルオランテン化合物及びそれを用いた有機エレクトロルミネッセンス素子 - Google Patents
フルオランテン化合物及びそれを用いた有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2011052186A1 WO2011052186A1 PCT/JP2010/006317 JP2010006317W WO2011052186A1 WO 2011052186 A1 WO2011052186 A1 WO 2011052186A1 JP 2010006317 W JP2010006317 W JP 2010006317W WO 2011052186 A1 WO2011052186 A1 WO 2011052186A1
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- -1 Fluoranthene compound Chemical class 0.000 title claims abstract description 145
- GVEPBJHOBDJJJI-UHFFFAOYSA-N fluoranthrene Natural products C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=C1 GVEPBJHOBDJJJI-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 125000003118 aryl group Chemical group 0.000 claims abstract description 102
- 125000001072 heteroaryl group Chemical group 0.000 claims abstract description 58
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 26
- 125000000753 cycloalkyl group Chemical group 0.000 claims abstract description 22
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 21
- 125000004432 carbon atom Chemical group C* 0.000 claims description 150
- 238000005401 electroluminescence Methods 0.000 claims description 77
- 239000000463 material Substances 0.000 claims description 70
- 125000001424 substituent group Chemical group 0.000 claims description 67
- 150000001875 compounds Chemical class 0.000 claims description 63
- 125000006413 ring segment Chemical group 0.000 claims description 40
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- BBEAQIROQSPTKN-UHFFFAOYSA-N pyrene Chemical compound C1=CC=C2C=CC3=CC=CC4=CC=C1C2=C43 BBEAQIROQSPTKN-UHFFFAOYSA-N 0.000 claims description 16
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 15
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- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 9
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- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 claims description 8
- 125000004122 cyclic group Chemical group 0.000 claims description 8
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- 150000001340 alkali metals Chemical class 0.000 description 6
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- 238000004544 sputter deposition Methods 0.000 description 6
- KHNYNFUTFKJLDD-UHFFFAOYSA-N Benzo[j]fluoranthene Chemical class C1=CC(C=2C3=CC=CC=C3C=CC=22)=C3C2=CC=CC3=C1 KHNYNFUTFKJLDD-UHFFFAOYSA-N 0.000 description 5
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- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 5
- 229910052761 rare earth metal Inorganic materials 0.000 description 5
- 150000002910 rare earth metals Chemical class 0.000 description 5
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 5
- HZNVUJQVZSTENZ-UHFFFAOYSA-N 2,3-dichloro-5,6-dicyano-1,4-benzoquinone Chemical compound ClC1=C(Cl)C(=O)C(C#N)=C(C#N)C1=O HZNVUJQVZSTENZ-UHFFFAOYSA-N 0.000 description 4
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 229910001508 alkali metal halide Inorganic materials 0.000 description 4
- 150000008045 alkali metal halides Chemical class 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052788 barium Inorganic materials 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
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- 238000005755 formation reaction Methods 0.000 description 4
- 125000000623 heterocyclic group Chemical group 0.000 description 4
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 4
- 229960003540 oxyquinoline Drugs 0.000 description 4
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
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- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- 0 Bc1ccc(*)c2c1cccc2 Chemical compound Bc1ccc(*)c2c1cccc2 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
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- 229910001615 alkaline earth metal halide Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 150000001412 amines Chemical class 0.000 description 3
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- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 3
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- QWXYZCJEXYQNEI-OSZHWHEXSA-N intermediate I Chemical compound COC(=O)[C@@]1(C=O)[C@H]2CC=[N+](C\C2=C\C)CCc2c1[nH]c1ccccc21 QWXYZCJEXYQNEI-OSZHWHEXSA-N 0.000 description 3
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- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 2
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- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 1
- 125000001160 methoxycarbonyl group Chemical group [H]C([H])([H])OC(*)=O 0.000 description 1
- 125000006626 methoxycarbonylamino group Chemical group 0.000 description 1
- 125000004170 methylsulfonyl group Chemical group [H]C([H])([H])S(*)(=O)=O 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 1
- 125000004573 morpholin-4-yl group Chemical group N1(CCOCC1)* 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
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000003136 n-heptyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 125000001715 oxadiazolyl group Chemical group 0.000 description 1
- 150000007978 oxazole derivatives Chemical class 0.000 description 1
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- RDOWQLZANAYVLL-UHFFFAOYSA-N phenanthridine Chemical group C1=CC=C2C3=CC=CC=C3C=NC2=C1 RDOWQLZANAYVLL-UHFFFAOYSA-N 0.000 description 1
- 125000004934 phenanthridinyl group Chemical group C1(=CC=CC2=NC=C3C=CC=CC3=C12)* 0.000 description 1
- 125000004625 phenanthrolinyl group Chemical group N1=C(C=CC2=CC=C3C=CC=NC3=C12)* 0.000 description 1
- 125000001791 phenazinyl group Chemical group C1(=CC=CC2=NC3=CC=CC=C3N=C12)* 0.000 description 1
- 125000001484 phenothiazinyl group Chemical group C1(=CC=CC=2SC3=CC=CC=C3NC12)* 0.000 description 1
- 125000001644 phenoxazinyl group Chemical group C1(=CC=CC=2OC3=CC=CC=C3NC12)* 0.000 description 1
- 150000004986 phenylenediamines Chemical class 0.000 description 1
- 125000003356 phenylsulfanyl group Chemical group [*]SC1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 125000003386 piperidinyl group Chemical group 0.000 description 1
- 125000005936 piperidyl group Chemical group 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000123 polythiophene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- LVTJOONKWUXEFR-FZRMHRINSA-N protoneodioscin Natural products O(C[C@@H](CC[C@]1(O)[C@H](C)[C@@H]2[C@]3(C)[C@H]([C@H]4[C@@H]([C@]5(C)C(=CC4)C[C@@H](O[C@@H]4[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@@H](O)[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@H](CO)O4)CC5)CC3)C[C@@H]2O1)C)[C@H]1[C@H](O)[C@H](O)[C@H](O)[C@@H](CO)O1 LVTJOONKWUXEFR-FZRMHRINSA-N 0.000 description 1
- JEXVQSWXXUJEMA-UHFFFAOYSA-N pyrazol-3-one Chemical class O=C1C=CN=N1 JEXVQSWXXUJEMA-UHFFFAOYSA-N 0.000 description 1
- 150000003219 pyrazolines Chemical class 0.000 description 1
- 125000005554 pyridyloxy group Chemical group 0.000 description 1
- 125000005030 pyridylthio group Chemical group N1=C(C=CC=C1)S* 0.000 description 1
- 125000000168 pyrrolyl group Chemical group 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- JWVCLYRUEFBMGU-UHFFFAOYSA-N quinazoline Chemical compound N1=CN=CC2=CC=CC=C21 JWVCLYRUEFBMGU-UHFFFAOYSA-N 0.000 description 1
- 125000002294 quinazolinyl group Chemical group N1=C(N=CC2=CC=CC=C12)* 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 238000010898 silica gel chromatography Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical class C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229940042055 systemic antimycotics triazole derivative Drugs 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 150000003613 toluenes Chemical class 0.000 description 1
- 125000002088 tosyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1C([H])([H])[H])S(*)(=O)=O 0.000 description 1
- 125000000025 triisopropylsilyl group Chemical group C(C)(C)[Si](C(C)C)(C(C)C)* 0.000 description 1
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 1
- 229910052722 tritium Inorganic materials 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/77—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D307/91—Dibenzofurans; Hydrogenated dibenzofurans
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C15/00—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts
- C07C15/20—Polycyclic condensed hydrocarbons
- C07C15/38—Polycyclic condensed hydrocarbons containing four rings
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/622—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing four rings, e.g. pyrene
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6574—Polycyclic condensed heteroaromatic hydrocarbons comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1003—Carbocyclic compounds
- C09K2211/1007—Non-condensed systems
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1003—Carbocyclic compounds
- C09K2211/1011—Condensed systems
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1088—Heterocyclic compounds characterised by ligands containing oxygen as the only heteroatom
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
Definitions
- the present invention relates to a fluoranthene compound, a solution containing an organic electroluminescence material containing the compound, and an organic electroluminescence device using the same. More specifically, the present invention relates to a fluoranthene compound capable of producing an organic electroluminescence device having high luminous efficiency and a long lifetime.
- An organic electroluminescence (EL) element is a self-luminous element utilizing the principle that a fluorescent substance emits light by recombination energy of holes injected from an anode and electrons injected from a cathode by applying an electric field.
- Such an organic EL element includes a pair of electrodes composed of an anode and a cathode, and an organic light emitting medium between the electrodes.
- the organic light emitting medium is composed of a laminate of layers having various functions.
- the light emitting material of the light emitting layer materials that emit light in respective colors (for example, red, green, and blue) have been developed.
- fluoranthene compounds are disclosed in Patent Document 1 and Patent Document 2 as blue light-emitting materials.
- the fluoranthene compounds disclosed in Patent Document 1 and Patent Document 2 have a problem that they are not sufficient in terms of luminous efficiency and lifetime.
- An object of the present invention is to provide a fluoranthene compound capable of producing an organic EL device having high luminous efficiency and a long lifetime.
- a fluoranthene compound represented by the following formula (1) (Wherein Z 7 and Z 12 are each independently a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms. .
- Ar 0 is a single bond, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, and R 1 to R 4 and R A linking group that is bonded to any one of 6 to R 9 .
- R 1 to R 4 and R 6 to R 9 are each independently a hydrogen atom, an alkyl group, a cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, or a substituted silyl group. Or R 1 and R 2 , R 2 and R 3 , R 3 and R 4 , R 6 and R 7 , R 7 and R 8 , and R 8 and R 9 are bonded to each other, saturated or unsaturated A saturated ring structure is formed.
- the cyclic structure may further have a substituent.
- l is an integer of 1 to 4, and when l is 2 or more, the plurality of Ar 0 may be the same or different, and the substituents of Ar 0 adjacent to each other may be bridged.
- the fluoranthene compound of 1 represented by following formula (2).
- Z 7 , Z 12 , R 1 to R 4 , and R 6 to R 9 are the same as those in the formula (1).
- Ar 3 and Ar 4 are each independently a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, Ar 4 being , R 1 to R 4 and R 6 to R 9 .
- the substituent of Ar 3 and the substituent of Ar 4 may be crosslinked.
- Ar 1 is a single bond, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms.
- Z 7 , Z 12 , R 1 , R 2 , R 4 , and R 6 to R 9 are the same as those in the formula (1).
- Ar 1 is a single bond, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms. ) 5.
- Ar 1 is a single bond, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms. ) 6).
- Z 7 , Z 12 , R 1 , R 3 , R 4 , and R 6 to R 9 are the same as those in the formula (1).
- Ar 2 is a single bond, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms. ) 7).
- Ar 2 is either a single bond, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, or a linking group represented by the following formula:
- R 1 , R 3 , R 4 , R 6 , R 7 , R 8 and R 9 is an alkyl group, a cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or 6.
- X 1 to X 10 , Y 1 and Y 2 are each independently a hydrogen atom, a fluorine atom, a cyano group, an alkyl group, a cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted group, It is a heteroaryl group or a substituted silyl group.
- Z 7 and Z 12 are each independently a phenyl group, naphthyl group, fluorenyl group, 9,9′-dimethylfluorenyl group, diethylfluorenyl group, dipropylfluorenyl group, diisopropylfluorenyl group, dibutyl
- An organic electroluminescence device that sandwiches an organic compound layer composed of one or more layers including at least a light emitting layer between a pair of electrodes, An organic electroluminescence device, wherein at least one of the organic compound layers contains at least one fluoranthene compound according to any one of 1 to 8. 10. 10. The organic electroluminescence device according to 9, wherein the light emitting layer contains the fluoranthene compound. 11. 11. The organic electroluminescence device according to 10, wherein the content of the fluoranthene compound in the light emitting layer is 0.01 to 20% by mass. 12 The organic electroluminescent device according to 10 or 11, wherein the light emitting layer further comprises a compound represented by the following formula (2a) having an anthracene central skeleton.
- a 1 and A 2 are each independently a group derived from a substituted or unsubstituted aromatic ring having 6 to 20 ring carbon atoms.
- the aromatic ring is substituted with 1 or 2 or more substituents. It may be substituted with a group.
- the substituent is a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 carbon atoms, Substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, substituted or unsubstituted aralkyl group having 6 to 50 carbon atoms, substituted or unsubstituted aryloxy group having 5 to 50 ring atoms, substituted or unsubstituted An arylthio group having 5 to 50 ring atoms, a substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, a substituted or unsubstituted silyl group, a carboxyl group, a halogen atom, a cyano group, a nitro group, or a
- R 1 to R 8 each independently represents a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, substituted or unsubstituted A substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted carbon group having 6 to 50 carbon atoms An aralkyl group, a substituted or unsubstituted aryloxy group having 5 to 50 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, substituted or unsubstituted A substituted or unsubstituted alkyl group having 1
- Ar 1 and Ar 2 are each independently a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.
- L 1 and L 2 are each independently a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthalenylene group, a substituted or unsubstituted fluorenylene group, or a substituted or unsubstituted dibenzosilolylene group.
- m is an integer from 0 to 2
- n is an integer from 1 to 4
- s is an integer from 0 to 2
- t is an integer from 0 to 4.
- L 1 or Ar 1 is bonded to any one of positions 1 to 5 of pyrene, and L 2 or Ar 2 is bonded to any of positions 6 to 10 of pyrene.
- Ar 1 , Ar 2 and Ar 3 are each independently a group having an anthracene structure, a group having a phenanthrene structure, or a group having a pyrene structure.
- R 1 , R 2 and R 3 are each independently a hydrogen atom or a substituent.
- the organic electroluminescence device according to 10 or 11, wherein the light emitting layer further contains a compound represented by the following formula (2d).
- Ar 11 , Ar 21 and Ar 31 are each independently an aryl group having 6 to 50 ring carbon atoms. The aryl group may be substituted with one or more substituents.
- Ar 11 , Ar 21 , Ar 31 and at least one of the substituents of these aryl groups are a condensed aryl structure having 10 to 20 ring carbon atoms or a condensed heteroaryl structure having 6 to 20 ring carbon atoms.
- Ar is a trivalent group derived from an aromatic ring or a heteroaromatic ring.
- the organic electroluminescent material comprises a host material and a dopant material;
- the dopant material is a fluoranthene compound according to any one of 1 to 8,
- the host material is a compound represented by formula (2a) of 12, a compound represented by formula (2b) of 16, a compound represented by formula (2c) of 17, and a formula (2d) of 18.
- the fluoranthene compound which can produce an organic EL element with high luminous efficiency and a long lifetime can be provided.
- an organic EL element having high luminous efficiency and a long lifetime can be provided.
- the fluoranthene compound of the present invention is represented by the following formula (1).
- Z 7 and Z 12 are each independently a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms.
- Ar 0 is a single bond, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, and R 1 to R 4 and R A linking group that is bonded to any one of 6 to R 9 .
- R 1 to R 4 and R 6 to R 9 are each independently a hydrogen atom, an alkyl group, a cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, or a substituted silyl group.
- R 1 and R 2 , R 2 and R 3 , R 3 and R 4 , R 6 and R 7 , R 7 and R 8 , and R 8 and R 9 are bonded to each other, saturated or unsaturated A saturated ring structure is formed.
- the cyclic structure may further have a substituent.
- l is an integer of 1 to 4, and when l is 2 or more, the plurality of Ar 0 may be the same or different, and the substituents of Ar 0 adjacent to each other may be bridged.
- the benzofluoranthene skeleton mainly involved in light emission has a long conjugation length and high planarity, so that it is easy to stack, which may lead to a decrease in light emission efficiency.
- the fluoranthene compound of the present invention it is considered that the introduction of a dibenzofuran skeleton having an oxygen atom around the benzofluoranthene skeleton has an effect of preventing association by stacking, and the luminous efficiency is improved.
- R 1 and R 2 , R 2 and R 3 , R 3 and R 4 , R 6 and R 7 , R 7 and R 8 , and R 8 and R 9 in the dibenzofuran part are bonded to each other.
- a saturated or unsaturated cyclic structure may be formed. The following can be illustrated as the said cyclic structure.
- R is a hydrogen atom, a fluorine atom, a substituted silyl group, a cyano group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, an alkyl group, or a cycloalkyl group.
- the Ar 0 adjacent to each other may be the same or different and may be crosslinked Ar 0 each other through any of the substituents, the substituents Ar 0 between May be crosslinked.
- l is 2, if the two Ar 0 are both phenylene groups, as the cross-linking structure, the following can be exemplified.
- X 1 to X 9 and Y 1 to Y 4 each independently represent a hydrogen atom, a fluorine atom, a substituted silyl group, a cyano group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group , A benzofluoranthene skeleton, or any one of R 1 to R 4 and R 6 to R 9 is bonded to X 1 to X 9 and Y 1 to Y 4 .
- the fluoranthene compound represented by the formula (1) is preferably a fluoranthene compound represented by the following formula (2), (3), (4), (5) or (6).
- Z 7 , Z 12 , R 1 to R 4 , and R 6 to R 9 are the same as those in the formula (1).
- Ar 3 and Ar 4 are each independently a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, Ar 4 being , R 1 to R 4 and R 6 to R 9 .
- Ar 3 and Ar 4 may be cross-linked via any substituent, and the substituent of Ar 3 and the substituent of Ar 4 may be cross-linked.
- Z 7 , Z 12 , R 1 to R 3 , and R 6 to R 9 are the same as those in the formula (1).
- Ar 1 is a single bond, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms.
- Z 7 , Z 12 , R 1 , R 2 , R 4 , and R 6 to R 9 are the same as those in the formula (1).
- Ar 1 is a single bond, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms.
- Z 7 , Z 12 , R 2 to R 4 , and R 6 to R 9 are the same as those in the formula (1).
- Ar 1 is a single bond, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms.
- Z 7 , Z 12 , R 1 , R 3 , R 4 , and R 6 to R 9 are the same as those in the formula (1).
- Ar 2 is a single bond, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms.
- Ar 2 is preferably a single bond, a substituted or unsubstituted heteroaryl group having 5 to 50 ring-forming atoms, or a linking group represented by the following formula: And when Ar 2 is a single bond, at least one of R 1 , R 3 , R 4 , R 6 , R 7 , R 8 and R 9 is an alkyl group, a cycloalkyl group, a substituted or unsubstituted aryl A group, a substituted or unsubstituted heteroaryl group, or a substituted silyl group.
- X 1 to X 10 , Y 1 and Y 2 are each independently a hydrogen atom, a fluorine atom, a substituted silyl group, a cyano group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, An alkyl group or a cycloalkyl group;
- symbol shows a single bond with a fluoranthene skeleton or a dibenzofuran skeleton.
- Ar 2 of the fluoranthene compound represented by the formula (6) is a single bond, and at least one of R 1 , R 3 , R 4 , R 6 , R 7 , R 8 and R 9 is a substituted aryl group, substituted
- the substituent further possessed by these substituents is preferably a substituted silyl group, an alkyl group, a cycloalkyl group, an aryl group, or a heteroaryl group.
- aryl group means “a group derived by removing a hydrogen atom from an aromatic compound”, and includes not only a monovalent aryl group but also a divalent “arylene group” and the like. Including. The same applies to the “heteroaryl group”.
- the “hydrogen atom” also includes a deuterium atom and a tritium atom.
- the substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms of Z 7 , Z 12 and Ar 0 to Ar 4 is preferably a substituted or unsubstituted aryl group having 5 to 20 ring carbon atoms, and more Preferred is a substituted or unsubstituted aryl group having 5 to 14 ring carbon atoms, such as phenyl group, naphthyl group, phenanthryl group, anthryl group, benzanthryl group, pyrenyl group, chrysenyl group, fluorenyl group, 9,9 -Dimethylfluorenyl group, diethylfluorenyl group, dipropylfluorenyl group, diisopropylfluorenyl group, dibutylfluorenyl group, diphenylfluorenyl group, biphenyl group, triphenylyl group, etc., preferably Phenyl group, naphthy
- the substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms of Z 7 , Z 12 and Ar 0 is preferably a substituted or unsubstituted heteroaryl group having 5 to 20 ring atoms, and more Preferred is a substituted or unsubstituted heteroaryl group having 5 to 14 ring atoms, such as pyrrolyl group, pyrazinyl group, pyridinyl group, indolyl group, isoindolyl group, furyl group, dibenzofuranyl group, benzofuranyl group, isobenzo group.
- Examples of the substituted or unsubstituted aryl group for R 1 to R 4 , R 6 to R 9 , X 1 to X 10 and Y 1 to Y 4 include the above substituted or unsubstituted aryl having 5 to 50 ring carbon atoms. Examples of the substituent are the same as those of the group. Examples of the substituted or unsubstituted heteroaryl group of R 1 to R 4 , R 6 to R 9 , X 1 to X 10 and Y 1 to Y 4 include the above-mentioned substituted or unsubstituted ring-forming atoms of 5 to Substituents similar to 50 heteroaryl groups can be mentioned.
- Examples of the alkyl group of R 1 to R 4 , R 6 to R 9 , X 1 to X 10 and Y 1 to Y 4 include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, and a s-butyl group.
- Examples of the cycloalkyl group represented by R 1 to R 4 , R 6 to R 9 , X 1 to X 10 and Y 1 to Y 4 include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a 4-methylcyclohexyl group, A 1-adamantyl group, a 2-adamantyl group, a 1-norbornyl group, a 2-norbornyl group and the like can be mentioned, and a cyclopentyl group and a cyclohexyl group are preferable.
- the substituted silyl groups of R 1 to R 4 , R 6 to R 9 , X 1 to X 10 and Y 1 to Y 4 include trimethylsilyl group, triethylsilyl group, t-butyldimethylsilyl group, vinyldimethylsilyl group, propyl Examples thereof include a dimethylsilyl group, a triphenylsilyl group, and a triisopropylsilyl group, and a trimethylsilyl group, a triethylsilyl group, and a t-butyldimethylsilyl group are preferable.
- Substituents that are further substituted on the above-mentioned substituents of the fluoranthene compound for example, substituted or unsubstituted aryl group substituents having 5 to 50 ring carbon atoms, and all substitutions in the expression “substituted or unsubstituted”
- substituents include a fluorine atom, a substituted silyl group, a cyano group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, an alkyl group, and a cycloalkyl group.
- Fluoranthene compound of the present invention is, for example, J. Org. Chem. , 55, 4190, (1990), J. Am. Org. Chem. 68, 883, (2003), carbon-carbon bond formation reaction (Suzuki, Kumada-Tamao, Still, Sonogami reaction, etc.) and cyclization reaction.
- the fluoranthene compound of the present invention is preferably used as a material for an organic EL device, and more preferably used as a light emitting material for an organic EL device, particularly as a doping material.
- the organic EL device of the present invention is an organic electroluminescent device in which an organic compound layer composed of one layer or a plurality of layers including at least a light emitting layer is sandwiched between a pair of electrodes, and at least one of the organic compound layers is the present invention.
- the light emitting layer preferably contains a fluoranthene compound
- the light emitting layer preferably contains 0.1 to 20 wt% of the fluoranthene compound of the present invention, preferably 0.5 to 20 wt%. It is more preferably contained, particularly preferably 1 to 18% by weight, and most preferably 2.5 to 15% by weight.
- the organic EL element using the organic EL element material containing the fluoranthene compound of the present invention can emit blue light.
- the light emitting layer is selected from at least one fluoranthene compound and compounds represented by the following formulas (2a), (2b), (2c) and (2d).
- at least one selected from the compounds represented by the following formulas (2a), (2b), (2c) and (2d) is a host material.
- a 1 and A 2 are each independently a group derived from a substituted or unsubstituted aromatic ring having 6 to 20 nuclear carbon atoms.
- the aromatic ring may be substituted with one or more substituents.
- the substituent is a substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 carbon atoms, substituted or unsubstituted An unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 carbon atoms, a substituted or unsubstituted aryloxy group having 5 to 50 nuclear atoms, a substituted or unsubstituted number of nuclear atoms It is selected from 5 to 50 arylthio groups, substituted or unsub
- R 1 to R 8 each independently represents a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 50 nuclear atoms, a substituted or unsubstituted group; An alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, and a substituted or unsubstituted aralkyl group having 6 to 50 carbon atoms.
- Group substituted or unsubstituted aryloxy group having 5 to 50 nucleus atoms, substituted or unsubstituted arylthio group having 5 to 50 nucleus atoms, substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, substituted or It is selected from unsubstituted silyl group, carboxy group, halogen atom, cyano group, nitro group and hydroxyl group.
- a 1 and A 2 are preferably different groups.
- at least one of A 1 and A 2 is preferably a substituent having a substituted or unsubstituted condensed ring group having 10 to 30 nucleus atoms.
- the substituted or unsubstituted condensed ring group having 10 to 30 nucleus atoms is preferably a substituted or unsubstituted naphthalene ring.
- R 1 to R 8 and the substituted or unsubstituted aryloxy group and arylthio group having 5 to 50 nuclear atoms of the substituent of the aromatic ring are represented by —OY ′ and —SY ′′, respectively.
- Examples of Y ′ and Y ′′ include the same examples as those of R 1 to R 8 and the substituted or unsubstituted aryl group having 6 to 50 nucleus atoms of the aromatic ring substituent.
- R 1 to R 8 in the general formula (2a) and the substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms of the substituent of the aromatic ring are represented by —COOZ, and Z represents the above R 1 to R 8 and the same examples as those of the substituted or unsubstituted alkyl group having 1 to 50 carbon atoms of the substituent of the aromatic ring.
- R 1 to R 8 in the general formula (2a) and the silyl group of the substituent of the aromatic ring a trimethylsilyl group, a triethylsilyl group, a t-butyldimethylsilyl group, a vinyldimethylsilyl group, a propyldimethylsilyl group, a trimethylsilyl group, A phenylsilyl group etc. are mentioned.
- Examples of the halogen atom for R 1 to R 8 in the general formula (2a) and the substituent of the aromatic ring include fluorine.
- Examples of the substituent in the groups represented by R 1 to R 8 and the substituent of the aromatic ring include a halogen atom, a hydroxyl group, a nitro group, a cyano group, an alkyl group, an aryl group, a cycloalkyl group, an alkoxy group, and an aromatic group.
- Examples include a heterocyclic group, an aralkyl group, an aryloxy group, an arylthio group, an alkoxycarbonyl group, and a carboxy group.
- the anthracene derivative represented by the general formula (2a) is preferably a compound having a structure represented by the following general formula (2a ′).
- (2a '), A 1 and A 2, R 1 ⁇ R 8 are each independently, the same as the general formula (2a), the same examples can be cited.
- groups that are symmetrical with respect to the XY axis shown on the anthracene do not bond to the 9th and 10th positions of the central anthracene.
- anthracene derivative represented by the general formula (2a) used in the organic EL device of the present invention include an anthracene skeleton in the molecule shown in JP-A-2004-356033 [0043] to [0063]. And various known anthracene derivatives such as compounds having one anthracene skeleton as shown on pages 27 to 28 of WO 2005/061656.
- Ar 1 and Ar 2 are each independently a substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms.
- L 1 and L 2 are each independently selected from a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthalenylene group, a substituted or unsubstituted fluorenylene group, and a substituted or unsubstituted dibenzosilolylene group.
- m is an integer from 0 to 2
- n is an integer from 1 to 4
- s is an integer from 0 to 2
- t is an integer from 0 to 4.
- L 1 or Ar 1 is bonded to any one of positions 1 to 5 of pyrene
- L 2 or Ar 2 is bonded to any of positions 6 to 10 of pyrene.
- L 1 and L 2 in the general formula (2b) are preferably selected from a substituted or unsubstituted phenylene group and a substituted or unsubstituted fluorenylene group. Moreover, as this substituent, the thing similar to what was mentioned by the said aromatic group is mentioned.
- M in the general formula (2b) is preferably an integer of 0 to 1.
- N in the general formula (2b) is preferably an integer of 1 to 2.
- s is preferably an integer of 0 to 1.
- T in the general formula (2b) is preferably an integer of 0 to 2.
- Ar 1 , Ar 2 and Ar 3 are each independently selected from a group having an anthracene structure, a group having a phenanthrene structure, a group having a perylene structure and a group having a pyrene structure.
- R 1 , R 2 and R 3 each independently represents a hydrogen atom or a substituent.
- Ar 1 , Ar 2 and Ar 3 in the general formula (2c) are preferably selected from a substituted or unsubstituted anthrylphenyl group, anthryl group, phenanthrenyl group, perylenyl group and pyrenyl group, and more preferably an alkyl-substituted or unsubstituted group. It is selected from a substituted anthrylphenyl group, phenanthryl group and pyrenyl group, and particularly preferably selected from a pyrenyl group and a phenanthryl group.
- R 1 , R 2 and R 3 in the general formula (2c) are a hydrogen atom or an alkyl group (preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, particularly preferably 1 to 10 carbon atoms).
- alkoxycarbonyl group preferably having 2 to 30 carbon atoms, more preferably 2 to 20 carbon atoms, particularly preferably 2 to 12 carbon atoms.
- carbamoyl methylcarbamoyl, diethylcarbamoyl, phenylcarbamoyl and the like
- alkylthio groups preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, particularly preferably 1 to 12 carbon atoms, Methylthio, ethylthio and the like
- arylthio group preferably having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, particularly preferably 6 to 12 carbon atoms, such as phenylthio
- heteroaryl A ruthio group preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as pyridylthio, 2-benzimidazolylthio, 2-benzoxazolylthio, 2- Benzthiazolylthio
- sulfonyl group preferably having 1 to 0, more preferably 1 to 20 carbon
- ureido groups preferably 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, particularly preferably carbon numbers
- phosphoric acid amide group preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, and particularly preferably 1 to 12 carbon atoms.
- diethyl phosphate amide, phenyl phosphate amide, etc. hydroxy group, mercapto group, halogen atom ( For example, fluorine atom, chlorine atom, bromine atom, iodine atom, etc.), cyano group, sulfo group, carboxy group, nitro group, hydroxamic acid group, sulfino group, hydrazino group, imino group, heterocyclic group (preferably The heteroatom includes, for example, a nitrogen atom, an oxygen atom, a sulfur atom, specifically, for example, imidazolyl, pyridyl, quinolyl, furyl, thienyl, piperidyl, morpholino.
- Benzoxazolyl, benzimidazolyl, benzthiazolyl and the like a substituted or unsubstituted silyl group (preferably having 3 to 40 carbon atoms, more preferably 3 to 30 carbon atoms, particularly preferably 3 to 24 carbon atoms). For example, trimethylsilyl, triphenylsilyl, etc.). These substituents may be further substituted.
- the substituents R 1 , R 2 and R 3 in the general formula (2c) are preferably selected from an alkyl group and an aryl group.
- amine derivative represented by the general formula (2c) used in the organic EL device of the present invention include the amine derivatives shown in JP-A-2002-324678 [0079] to [0083]. And various amine derivatives.
- Ar 11 , Ar 21 and Ar 31 each independently represents an aryl group having 6 to 50 nuclear carbon atoms.
- the aryl group may be substituted with one or more substituents.
- Ar 11 , Ar 21 , Ar 31 and at least one of the substituents of these aryl groups have a condensed aryl structure having 10 to 20 nuclear carbon atoms or a condensed heteroaryl structure having 6 to 20 nuclear carbon atoms.
- Ar represents a trivalent group derived from an aromatic ring or a heteroaromatic ring.
- the aryl group having 6 to 50 nuclear carbon atoms of Ar 11 , Ar 21 and Ar 31 in the general formula (2d) preferably has 6 to 30 nuclear carbon atoms, more preferably 6 to 20 carbon atoms, still more preferably 6 to 16 carbon atoms. is there. These aryl groups may further have a substituent.
- substituent on the aryl group examples include an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an amino group, an alkoxy group, an aryloxy group, a heteroaryloxy group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, Acyloxy group, acylamino group, alkoxycarbonylamino group, aryloxycarbonylamino group, sulfonylamino group, sulfamoyl group, carbamoyl group, alkylthio group, arylthio group, heteroarylthio group, sulfonyl group, sulfinyl group, ureido group, phosphoric acid amide Group, hydroxy group, mercapto group, halogen atom (eg, fluorine atom, chlorine atom, bromine atom, iodine atom), cyano group, sulf
- Ar 11 , Ar 21 , Ar 31 and at least one of the substituents of these aryl groups have a condensed aryl structure having 10 to 20 nuclear carbon atoms, such as naphthalene structure, anthracene structure, phenanthrene structure A pyrene structure, a perylene structure, and the like, preferably a naphthalene structure, an anthracene structure, a pyrene structure, and a phenanthrene structure, more preferably a phenanthrene structure, and an aryl structure having four or more rings, and particularly preferably a pyrene structure.
- a condensed aryl structure having 10 to 20 nuclear carbon atoms such as naphthalene structure, anthracene structure, phenanthrene structure A pyrene structure, a perylene structure, and the like, preferably a naphthalene structure, an anthracene structure, a pyrene structure, and a phen
- Ar 11 , Ar 21 , Ar 31 and at least one of the substituents of these aryl groups may have a condensed heteroaryl structure having 6 to 20 nuclear carbon atoms such as a quinoline structure, a quinoxaline structure, a quinazoline Examples include a structure, an acridine structure, a phenanthridine structure, a phthalazine structure, and a phenanthroline structure, and a quinoline structure, a quinoxaline structure, a quinazoline structure, a phthalazine structure, and a phenanthroline structure are preferable.
- the trivalent group derived from the aromatic ring of Ar in the general formula (2d) preferably has 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, and still more preferably 6 to 16 carbon atoms.
- the trivalent group derived from the heteroaromatic ring of Ar in the general formula (2d) preferably contains an atom selected from a nitrogen atom, a sulfur atom and an oxygen atom as a hetero atom, and more preferably contains a nitrogen atom.
- each organic layer such as a light emitting layer is formed by a dry film forming method such as vacuum vapor deposition, molecular beam vapor deposition (MBE), sputtering, plasma, ion plating, or a solution dissolved in a solvent.
- a dry film forming method such as vacuum vapor deposition, molecular beam vapor deposition (MBE), sputtering, plasma, ion plating, or a solution dissolved in a solvent.
- Application methods such as spin coating, dipping, casting, bar coating, roll coating, flow coating, and inkjet can be applied.
- the organic compound layer and the light emitting layer can be formed not only by vapor deposition but also by a wet process.
- the film thickness of each layer of the organic compound layer is not particularly limited, it is necessary to set an appropriate film thickness.
- the film thickness is preferably in the range of 5 nm to 10 ⁇ m, but more preferably in the range of 10 nm to 0.2 ⁇ m.
- an organic EL material-containing solution containing the fluoranthene compound of the present invention and a solvent can be used as the material for the organic EL element, and this organic EL material-containing solution can be used together with the fluoranthene compound of the present invention. It is preferable to use an organic EL material-containing solution containing at least one selected from the compounds represented by the formulas (2a), (2b), (2c) and (2d). In this case, the organic EL material forming each layer is dissolved or dispersed in an appropriate solvent to prepare an organic EL material-containing solution to form a thin film, and any solvent may be used.
- the solvent examples include halogenated hydrocarbon solvents such as dichloromethane, dichloroethane, chloroform, carbon tetrachloride, tetrachloroethane, trichloroethane, chlorobenzene, dichlorobenzene, chlorotoluene, trifluorotoluene, dibutyl ether, tetrahydrofuran, tetrahydropyran, Ether solvents such as dioxane, anisole, dimethoxyethane, etc., alcohol solvents such as methanol, ethanol, propanol, isopropanol, butanol, pentanol, hexanol, cyclohexanol, methyl cellosolve, ethyl cellosolve, ethylene glycol, acetone, methyl ethyl ketone, diethyl Ketone, 2-hexanone, methyl isobutyl ketone,
- an appropriate resin or additive may be used for improving the film formability and preventing pinholes in the film.
- Usable resins include polystyrene, polycarbonate, polyarylate, polyester, polyamide, polyurethane, polysulfone, polymethyl methacrylate, polymethyl acrylate, cellulose and other insulating resins and copolymers thereof, poly-N-vinyl.
- photoconductive resins such as carbazole and polysilane, and conductive resins such as polyaniline, polythiophene, and polypyrrole.
- the additive include an antioxidant, an ultraviolet absorber, and a plasticizer.
- a protective layer on the surface of the device, or to protect the entire device with silicone oil, resin, etc. It is.
- a layer selected from a chalcogenide layer, a metal halide layer and a metal oxide layer is preferably disposed on at least one surface of a pair of electrodes.
- the organic EL element of this invention is produced on a translucent board
- the translucent substrate referred to here is a substrate that supports the organic EL element, and is preferably a smooth substrate having a light transmittance in the visible region of 400 to 700 nm of 50% or more.
- a glass plate, a polymer plate, etc. are mentioned.
- the glass plate include soda lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, and quartz.
- the polymer plate include polycarbonate, acrylic, polyethylene terephthalate, polyether sulfone, and polysulfone.
- Anode of the organic EL device of the present invention plays a role of injecting holes into the hole transport layer or the light emitting layer, and it is effective to have a work function of 4.5 eV or more.
- Specific examples of the anode material used in the present invention include indium tin oxide alloy (ITO), tin oxide (NESA), gold, silver, platinum, copper, and the like.
- the anode is preferably a material having a small work function for the purpose of injecting electrons into the electron transport layer or the light emitting layer.
- the anode can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering.
- the transmittance of the anode for light emission is greater than 10%.
- the sheet resistance of the anode is preferably several hundred ⁇ / ⁇ or less.
- the film thickness of the anode depends on the material, it is usually selected in the range of 10 nm to 1 ⁇ m, preferably 10 to 200 nm.
- the light emitting layer of the organic EL device has the following functions. That is, (1) Injection function; function that can inject holes from the anode or hole injection layer when an electric field is applied, and electron can be injected from the cathode or electron injection layer (2) transport function; injected charge (electrons (3) Light-emitting function; provides a field for recombination of electrons and holes, and has the function of connecting this to light emission.
- Injection function function that can inject holes from the anode or hole injection layer when an electric field is applied, and electron can be injected from the cathode or electron injection layer
- transport function injected charge
- Light-emitting function provides a field for recombination of electrons and holes, and has the function of connecting this to light emission.
- the transport capability represented by the mobility of holes and electrons may be large or small. It is preferable to move the charge.
- the light emitting layer As a method for forming the light emitting layer, for example, a known method such as a vapor deposition method, a spin coating method, or an LB method can be applied.
- the light emitting layer is particularly preferably a molecular deposited film.
- the molecular deposition film is a thin film formed by deposition from a material compound in a gas phase state or a film formed by solidification from a material compound in a solution state or a liquid phase state. Can be distinguished from the thin film (molecular accumulation film) formed by the LB method by the difference in the aggregated structure and the higher order structure and the functional difference resulting therefrom.
- the light emitting layer can also be formed by dissolving a binder such as a resin and a material compound in a solvent to form a solution, and then thinning the solution by a spin coating method or the like.
- a binder such as a resin and a material compound
- the fluoranthene compound of the present invention can be used for either a dopant material or a host material, but is particularly preferably used as a dopant material.
- the present invention other known light-emitting materials other than the light-emitting material comprising the compound having the fluoranthene structure of the present invention and the condensed ring-containing compound are optionally added to the light-emitting layer within the range in which the object of the present invention is not impaired.
- a light emitting layer containing another known light emitting material may be laminated on the light emitting layer containing the light emitting material of the present invention.
- the thickness of the light emitting layer is preferably 5 to 50 nm, more preferably 7 to 50 nm, and most preferably 10 to 50 nm. If the thickness is less than 5 nm, it is difficult to form a light emitting layer, and it may be difficult to adjust the chromaticity. If the thickness exceeds 50 nm, the driving voltage may increase.
- the hole injecting / transporting layer is a layer that helps injecting holes into the light emitting layer and transports it to the light emitting region, has a high hole mobility, and has a small ionization energy of usually 5.5 eV or less.
- the hole injecting and transporting layer is preferably made of a material which can transport holes to the emitting layer at a lower electric field strength,
- the hole mobility thereof is, for example, when 10 4 ⁇ 10 6 V / cm of electric field application Preferably, at least 10 ⁇ 4 cm 2 / V ⁇ sec.
- the hole injection / transport layer may be formed with the fluoranthene compound of the present invention alone, or may be used by mixing with other materials.
- the material for forming the hole injecting / transporting layer by mixing with the fluoranthene compound of the present invention is not particularly limited as long as it has the above-mentioned preferable properties. Any one of commonly used ones and known ones used for the hole injection / transport layer of organic EL elements can be selected and used.
- Examples include triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, Examples include hydrazone derivatives, stilbene derivatives, silazane derivatives, polysilanes, and aniline copolymers.
- the above-mentioned materials can be used, but it is preferable to use porphyrin compounds, aromatic tertiary amine compounds and styrylamine compounds, particularly aromatic tertiary amine compounds.
- NPD 4,4′-bis (N- (1-naphthyl) -N-phenylamino) biphenyl
- MTDATA triphenylamine 4,4 ′, 4 ′′ -tris (N- (3-methylphenyl) -N-phenylamino) triphenylamine
- inorganic compounds such as p-type Si and p-type SiC can also be used as the material for the hole injection layer.
- the hole injection / transport layer can be formed by thinning the above-described compound by a known method such as a vacuum deposition method, a spin coating method, a casting method, or an LB method.
- the thickness of the hole injection / transport layer is not particularly limited, but is usually 5 nm to 5 ⁇ m.
- Electron injection layer is a layer that assists the injection of electrons into the light-emitting layer, and has a high electron mobility.
- the adhesion improving layer is particularly adhering to the cathode among the electron injection layers. It is a layer made of a good material.
- a metal complex of 8-hydroxyquinoline or a derivative thereof is preferable.
- Specific examples of the metal complex of 8-hydroxyquinoline or its derivative include metal chelate oxinoid compounds containing a chelate of oxine (generally 8-quinolinol or 8-hydroxyquinoline).
- Alq described in the section of the light emitting material can be used as the electron injection layer.
- examples of the oxadiazole derivative include electron transfer compounds represented by the following general formula.
- Ar 1 , Ar 2 , Ar 3 , Ar 5 , Ar 6 and Ar 9 represent a substituted or unsubstituted aryl group, and may be the same or different from each other.
- Ar 4 , Ar 7 and Ar 8 represent a substituted or unsubstituted arylene group and may be the same or different.
- This electron transfer compound is preferably a thin film-forming compound.
- a preferred form of the organic EL device of the present invention is a device containing a reducing dopant in the region for transporting electrons or the interface region between the cathode and the organic layer.
- the reducing dopant is defined as a substance capable of reducing the electron transporting compound. Accordingly, various materials can be used as long as they have a certain reducibility, such as alkali metals, alkaline earth metals, rare earth metals, alkali metal oxides, alkali metal halides, alkaline earth metals.
- preferable reducing dopants include Li (work function: 2.9 eV), Na (work function: 2.36 eV), K (work function: 2.28 eV), Rb (work function: 2).
- a more preferable reducing dopant is at least one alkali metal selected from the group consisting of K, Rb, and Cs, more preferably Rb or Cs, and most preferably Cs. .
- alkali metals have particularly high reducing ability, and the addition of a relatively small amount to the electron injection region can improve the light emission luminance and extend the life of the organic EL element.
- a combination of these two or more alkali metals is also preferable.
- a combination containing Cs, for example, Cs and Na, Cs and K, Cs and Rb, A combination of Cs, Na and K is preferred.
- an electron injection layer composed of an insulator or a semiconductor may be further provided between the cathode and the organic layer. At this time, current leakage can be effectively prevented and the electron injection property can be improved.
- an insulator it is preferable to use at least one metal compound selected from the group consisting of alkali metal chalcogenides, alkaline earth metal chalcogenides, alkali metal halides and alkaline earth metal halides. If the electron injection layer is composed of these alkali metal chalcogenides or the like, it is preferable in that the electron injection property can be further improved.
- preferable alkali metal chalcogenides include, for example, Li 2 O, K 2 O, Na 2 S, Na 2 Se, and Na 2 O
- preferable alkaline earth metal chalcogenides include, for example, CaO, BaO. , SrO, BeO, BaS, and CaSe
- preferable alkali metal halides include, for example, LiF, NaF, KF, LiCl, KCl, and NaCl.
- examples of preferable alkaline earth metal halides include fluorides such as CaF 2 , BaF 2 , SrF 2 , MgF 2 and BeF 2 , and halides other than fluorides.
- the inorganic compound which comprises an electron carrying layer is a microcrystal or an amorphous insulating thin film. If the electron transport layer is composed of these insulating thin films, a more uniform thin film is formed, and pixel defects such as dark spots can be reduced. Examples of such inorganic compounds include the alkali metal chalcogenides, alkaline earth metal chalcogenides, alkali metal halides, and alkaline earth metal halides described above.
- Cathode As the cathode, in order to inject electrons into the electron injecting / transporting layer or the light emitting layer, a material having a small work function (4 eV or less), an alloy, an electrically conductive compound, and a mixture thereof as an electrode material Used. Specific examples of such electrode materials include sodium, sodium / potassium alloy, magnesium, lithium, magnesium / silver alloy, aluminum / aluminum oxide, aluminum / lithium alloy, indium, rare earth metal, and the like. This cathode can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering.
- the transmittance with respect to the light emitted from the cathode is larger than 10%.
- the sheet resistance as the cathode is preferably several hundred ⁇ / ⁇ or less, and the film thickness is usually 10 nm to 1 ⁇ m, preferably 50 to 200 nm.
- Insulating layer Since an organic EL element applies an electric field to an ultrathin film, pixel defects due to leakage or short-circuiting are likely to occur. In order to prevent this, it is preferable to insert an insulating thin film layer between the pair of electrodes.
- the material used for the insulating layer include aluminum oxide, lithium fluoride, lithium oxide, cesium fluoride, cesium oxide, magnesium oxide, magnesium fluoride, calcium oxide, calcium fluoride, aluminum nitride, titanium oxide, silicon oxide, and oxide. Examples include germanium, silicon nitride, boron nitride, molybdenum oxide, ruthenium oxide, and vanadium oxide. A mixture or laminate of these may be used.
- a thin film made of an anode material is formed on a suitable light-transmitting substrate by a method such as vapor deposition or sputtering so as to have a film thickness of 1 ⁇ m or less, preferably in the range of 10 to 200 nm, to produce an anode.
- a hole injection layer is provided on the anode.
- the hole injection layer can be formed by a vacuum deposition method, a spin coating method, a casting method, an LB method, or the like, but a uniform film can be easily obtained and pinholes are hardly generated. From the point of view, it is preferable to form by vacuum deposition.
- the deposition conditions vary depending on the compound used (the material of the hole injection layer), the crystal structure of the target hole injection layer, the recombination structure, etc.
- the source temperature is preferably selected from the range of 50 to 450 ° C., the degree of vacuum of 10 ⁇ 7 to 10 ⁇ 3 Torr, the deposition rate of 0.01 to 50 nm / second, the substrate temperature of ⁇ 50 to 300 ° C., and the film thickness of 5 nm to 5 ⁇ m. .
- the formation of the light emitting layer in which the light emitting layer is provided on the hole injection layer is also performed by thinning the organic light emitting material using a desired organic light emitting material by a method such as vacuum deposition, sputtering, spin coating, or casting.
- a vacuum deposition method from the viewpoint that a homogeneous film is easily obtained and pinholes are hardly generated.
- the light emitting layer is formed by vacuum vapor deposition, the vapor deposition conditions vary depending on the compound used, but can generally be selected from the same condition range as the hole injection layer.
- an electron injection layer is provided on the light emitting layer.
- an organic EL element can be obtained by laminating a cathode.
- the cathode is made of metal, and vapor deposition or sputtering can be used.
- vacuum deposition is preferred to protect the underlying organic layer from damage during film formation. It is preferable that the organic EL device described so far is manufactured from the anode to the cathode consistently by a single vacuum.
- each organic layer of the organic EL element of the present invention is not particularly limited. Generally, if the film thickness is too thin, defects such as pinholes are likely to occur. Therefore, the range of several nm to 1 ⁇ m is usually preferable.
- a direct current voltage is applied to the organic EL element, light emission can be observed when a voltage of 5 to 40 V is applied with the anode as + and the cathode as-polarity. Further, even when a voltage is applied with the opposite polarity, no current flows and no light emission occurs. Further, when alternating voltage is applied, uniform light emission is observed only when the anode has a positive polarity and the cathode has a negative polarity.
- the waveform of the alternating current to be applied may be arbitrary.
- the organic EL device of the present invention can be applied to products that require high luminous efficiency even at a low voltage.
- Application examples include display devices, displays, lighting devices, printer light sources, backlights of liquid crystal display devices, and the like, and can be applied to fields such as signs, signboards, and interiors.
- Examples of the display device include energy-saving and high-visibility flat panel displays.
- As a printer light source it can be used as a light source of a laser beam printer.
- the device volume can be greatly reduced.
- an energy saving effect can be expected by using the organic EL element of the present invention.
- Synthesis example 2 [Synthesis of 3-bromo-7,12-dibenzo [k] fluoranthene] A mixture of 14.9 g (55.2 mmol) of 1,3-diphenylisobenzofuran and 12.8 g (55.2 mmol) of 5-bromo-acenaphthylene prepared in Synthesis Example 1 was stirred for 16 hours while heating under reflux. After distilling off the solvent, 1200 ml of acetic acid was added and heated to 80 ° C. To this mixture, 150 ml of a 48% HBr aqueous solution was added and stirred at 80 ° C. for 1 hour. After cooling to room temperature, the precipitate was collected by filtration and washed with methanol.
- Synthesis example 3 [Synthesis of 7,12-dibenzo [k] fluoranthen-3-ylboronic acid] 30.8 g (64.0 mmol) of 3-bromo-7,12-dibenzo [k] fluoranthene prepared in Synthesis Example 2 was dissolved in 400 ml of dehydrated tetrahydrofuran and 300 ml of dehydrated toluene, cooled to ⁇ 70 ° C., and n-butyllithium. 44.6 ml (70.4 mmol) was added dropwise and stirred for 1 hour, 44.0 ml (192 mmol) of triisopropylpropyl boronate was added, and the temperature was raised to room temperature over 2 hours.
- Example 1 Compound 1 was synthesized according to the following scheme.
- Example 2 Compound 2 was synthesized according to the following scheme.
- Example 3 Compound 3 was synthesized according to the following scheme.
- Example 4 Compound 4 was synthesized according to the following scheme.
- Example 5 Compound 5 was synthesized according to the following scheme.
- Example 6 Compound 6 was synthesized according to the following scheme.
- Example 7 Compound 7 was synthesized according to the following scheme.
- Example 8 Compound 8 was synthesized according to the following scheme. [Synthesis of Intermediate K] In the synthesis of intermediate B in Example 1, intermediate E was used instead of intermediate A, and 1-bromo-3-iodobenzene was used instead of 6-bromo-2-naphthyl trifluoromethanesulfonate. Reaction was performed in the same manner to synthesize Intermediate K. The powder was identified as Intermediate K by FD-MS analysis.
- Example 9 A 25 mm ⁇ 75 mm ⁇ 1.1 mm thick glass substrate with ITO transparent electrode (anode) (manufactured by Geomatic) was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes and then UV ozone cleaning for 30 minutes.
- a glass substrate with a transparent electrode line after cleaning is attached to a substrate holder of a vacuum deposition apparatus, and first, the transparent electrode is covered on the surface on which the transparent electrode line is formed, and a film thickness is formed as a hole injection layer.
- a film of Compound A-1 having a thickness of 60 nm was formed by vapor deposition.
- a compound A-2 having a thickness of 20 nm was deposited on the A-1 film as a hole transport layer by vapor deposition.
- the compound H-1 as the host material and the compound 1 prepared in Example 1 as the dopant material were simultaneously deposited at a film thickness ratio of 40: 2 with a film thickness of 40 nm.
- Compound A-3 was deposited as an electron transport layer with a thickness of 40 nm by vapor deposition.
- lithium fluoride was deposited to a thickness of 1 nm, and then aluminum was deposited to a thickness of 150 nm. This aluminum / lithium fluoride serves as the cathode. In this way, an organic EL element was produced.
- the current density was 10 mA / cm 2
- the driving voltage was 3.8 V
- the emission peak wavelength (EL ⁇ max) was 452 nm
- the emission efficiency was 8.2 cd / A.
- the half-life was 6800 hours or more, and it was confirmed that it was in a sufficiently practical range. The results are shown in Table 1.
- Examples 10 to 16 and Comparative Example 1 An organic EL device was prepared and evaluated in the same manner as in Example 9 except that the compound shown in Table 1 was used instead of Compound 1 as the dopant material. The results are shown in Table 1.
- An organic EL device using the fluoranthene compound of the present invention as a material for an organic EL device, particularly a light emitting material for an organic EL device, has high luminous efficiency and a long lifetime.
- the organic EL device of the present invention has high practicality and is useful as a light source such as a flat light emitter of a wall-mounted television and a backlight of a display.
- the fluoranthene compound of the present invention can be used as a hole injection / transport material for an organic EL device, and also as a charge transport material for an electrophotographic photoreceptor or an organic semiconductor.
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Abstract
Description
しかしながら、特許文献1及び特許文献2に開示されているフルオランテン化合物は、発光効率及び寿命の点で十分ではないという問題があった。
1.下記式(1)で表されるフルオランテン化合物。
Ar0は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基であり、R1~R4及びR6~R9のいずれか1つと結合する連結基である。
R1~R4、R6~R9は、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、置換もしくは無置換のアリール基、置換もしくは無置換のヘテロアリール基、又は置換シリル基であるか、又はR1とR2、R2とR3、R3とR4、R6とR7、R7とR8、並びにR8とR9は、それぞれ互いに結合して、飽和もしくは不飽和の環状構造を形成する。前記環状構造はさらに置換基を有してもよい。
lは、1~4の整数であり、lが2以上の場合、複数のAr0はそれぞれ同じでも異なってもよく、互いに隣接するAr0の置換基同士が架橋してもよい。)
2.下記式(2)で表される1に記載のフルオランテン化合物。
Ar3及びAr4は、それぞれ独立に、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基であり、Ar4は、R1~R4及びR6~R9のいずれか1つと結合する連結基である。
Ar3の置換基とAr4の置換基が架橋してもよい。)
3.下記式(3)で表される1に記載のフルオランテン化合物。
Ar1は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基である。)
4.下記式(4)で表される1に記載のフルオランテン化合物。
Ar1は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基である。)
5.下記式(5)で表される1に記載のフルオランテン化合物。
Ar1は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基である。)
6.下記式(6)で表される1に記載のフルオランテン化合物。
Ar2は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基である。)
7.Ar2が、単結合、置換もしくは無置換の環形成原子数5~50のヘテロアリール基、又は下記式で表される連結基のいずれかであり、
Ar2が単結合の場合、R1、R3、R4、R6、R7、R8及びR9の少なくとも1つが、アルキル基、シクロアルキル基、置換もしくは無置換のアリール基、置換もしくは無置換のヘテロアリール基、又は置換シリル基である6に記載のフルオランテン化合物。
8.Z7及びZ12が、それぞれ独立にフェニル基、ナフチル基、フルオレニル基、9,9’-ジメチルフルオレニル基、ジエチルフルオレニル基、ジプロピルフルオレニル基、ジイソプロピルフルオレニル基、ジブチルフルオレニル基、ジフェニルフルオレニル基、又はフェナントリル基である1~7のいずれかに記載のフルオランテン化合物。
9.一対の電極間に少なくとも発光層を含む1層又は複数層からなる有機化合物層を挟持する有機エレクトロルミネッセンス素子であって、
前記有機化合物層の少なくとも1層が1~8のいずれかに記載のフルオランテン化合物を少なくとも1種含む有機エレクトロルミネッセンス素子。
10.前記発光層が前記フルオランテン化合物を含む9に記載の有機エレクトロルミネッセンス素子。
11.前記発光層中の前記フルオランテン化合物の含有量が0.01~20質量%である10に記載の有機エレクトロルミネッセンス素子。
12.前記発光層が、さらにアントラセン中心骨格を有する下記式(2a)で表される化合物を含む10又は11に記載の有機エレクトロルミネッセンス素子。
前記置換基は、置換もしくは無置換の環形成炭素数6~50のアリール基、置換もしくは無置換の炭素数1~50のアルキル基、置換もしくは無置換の炭素数3~50のシクロアルキル基、置換もしくは無置換の炭素数1~50のアルコキシ基、置換もしくは無置換の炭素数6~50のアラルキル基、置換もしくは無置換の環形成原子数5~50のアリールオキシ基、置換もしくは無置換の環形成原子数5~50のアリールチオ基、置換もしくは無置換の炭素数1~50のアルコキシカルボニル基、置換もしくは無置換のシリル基、カルボキシル基、ハロゲン原子、シアノ基、ニトロ基、又はヒドロキシル基である。
前記芳香族環が2以上の置換基で置換されている場合、前記置換基は同一であっても異なっていてもよく、隣接する置換基同士は互いに結合して飽和又は不飽和の環状構造を形成していてもよい。
R1~R8は、それぞれ独立に、水素原子、置換もしくは無置換の環形成炭素数6~50のアリール基、置換もしくは無置換の環形成原子数5~50のヘテロアリール基、置換もしくは無置換の炭素数1~50のアルキル基、置換もしくは無置換の炭素数3~50のシクロアルキル基、置換もしくは無置換の炭素数1~50のアルコキシ基、置換もしくは無置換の炭素数6~50のアラルキル基、置換もしくは無置換の環形成原子数5~50のアリールオキシ基、置換もしくは無置換の環形成原子数5~50のアリールチオ基、置換もしくは無置換の炭素数1~50のアルコキシカルボニル基、置換もしくは無置換のシリル基、カルボキシル基、ハロゲン原子、シアノ基、ニトロ基、又はヒドロキシル基である。)
13.A1とA2が互いに異なる置換基である12に記載の有機エレクトロルミネッセンス素子。
14.A1及びA2の少なくとも1つが、置換もしくは無置換の環形成原子数10~30の縮合環基を有する置換基である12に記載の有機エレクトロルミネッセンス素子。
15.置換もしくは無置換の環形成原子数10~30の縮合環基が、置換もしくは無置換のナフタレン環である14に記載の有機エレクトロルミネッセンス素子。
16.前記発光層が、さらにピレン中心骨格を有する下記式(2b)で表される化合物を含む10又は11に記載の有機エレクトロルミネッセンス素子。
L1及びL2は、それぞれ独立に、置換もしくは無置換のフェニレン基、置換もしくは無置換のナフタレニレン基、置換もしくは無置換のフルオレニレン基、又は置換もしくは無置換のジベンゾシロリレン基である。
mは0~2の整数、nは1~4の整数、sは0~2の整数、tは0~4の整数である。
L1又はAr1は、ピレンの1~5位のいずれかに結合し、L2又はAr2はピレンの6~10位のいずれかに結合する。)
17.前記発光層が、さらにトリフェニルアミン骨格を有する下記式(2c)で表される化合物を含む10又は11に記載の有機エレクトロルミネッセンス素子。
R1、R2及びR3は、それぞれ独立に、水素原子又は置換基である。)
18.前記発光層が、さらに下記式(2d)で表される化合物を含む10又は11に記載の有機エレクトロルミネッセンス素子。
前記アリール基は1又は2以上の置換基で置換されていてもよい。
Ar11、Ar21、Ar31及びこれらのアリール基が有する置換基の少なくとも1つは、環形成炭素数10~20の縮環アリール構造又は環形成炭素数6~20の縮環ヘテロアリール構造を有する。
Arは、芳香族環又は複素芳香環から誘導される3価の基である。)
19.有機エレクトロルミネッセンス材料である1~8のいずれかに記載のフルオランテン化合物、及び溶媒とを含有する有機エレクトロルミネッセンス材料含有溶液。
20.前記有機エレクトロルミネッセンス材料が、ホスト材料及びドーパント材料とを含み、
前記ドーパント材料が、1~8のいずれかに記載のフルオランテン化合物であり、
前記ホスト材料が、12の式(2a)で表される化合物、16の式(2b)で表される化合物、17の式(2c)で表される化合物、及び18の式(2d)で表される化合物から選ばれる少なくとも1種である19に記載の有機エレクトロルミネッセンス材料含有溶液。
また、本発明によれば、発光効率が高くかつ寿命が長い有機EL素子を提供することができる。
Ar0は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基であり、R1~R4及びR6~R9のいずれか1つと結合する連結基である。尚、Ar0と結合するR1~R4及びR6~R9のいずれか1つが水素の場合、Ar0とジベンゾフラン骨格との結合は単結合である。
R1~R4、R6~R9は、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、置換もしくは無置換のアリール基、置換もしくは無置換のヘテロアリール基、又は置換シリル基であるか、又はR1とR2、R2とR3、R3とR4、R6とR7、R7とR8、並びにR8とR9は、それぞれ互いに結合して、飽和もしくは不飽和の環状構造を形成する。前記環状構造はさらに置換基を有してもよい。
lは、1~4の整数であり、lが2以上の場合、複数のAr0はそれぞれ同じでも異なってもよく、互いに隣接するAr0の置換基同士が架橋してもよい。
これに対して本発明のフルオランテン化合物では、ベンゾフルオランテン骨格周辺に酸素原子を有するジベンゾフラン骨格を導入することによってスタッキングによる会合防止に効果があり、発光効率を向上させているものと考えられる。
当該環状構造としては、以下が例示できる。
例えばlが2であり、2つのAr0が共にフェニレン基である場合、上記架橋構造として、以下が例示できる。
尚、ベンゾフルオランテン骨格、又はR1~R4及びR6~R9のいずれか1つとの結合に用いられるX1~X9及びY1~Y4が水素原子の場合、ベンゾフルオランテン骨格、又はR1~R4及びR6~R9のいずれか1つとの結合は単結合である。また、X1~X9及びY1~Y4と結合するR1~R4及びR6~R9のいずれか1つが水素の場合、Ar0とジベンゾフラン骨格との結合は単結合である。
Ar3及びAr4は、それぞれ独立に、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基であり、Ar4は、R1~R4及びR6~R9のいずれか1つと結合する連結基である。
Ar3とAr4がいずれかの置換基を介して架橋してもよく、Ar3の置換基とAr4の置換基が架橋してもよい。
尚、Ar3とAr4がAr3とAr4が形成する架橋構造と結合するR1~R4及びR6~R9のいずれか1つが水素の場合、架橋構造とジベンゾフラン骨格との結合は単結合である。
Ar1は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基である。
Ar1は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基である。
Ar1は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基である。
Ar2は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基である。
尚、本発明において、「アリール基」は、「芳香族化合物から水素原子を除くことにより導かれる基」を意味し、1価のアリール基のみならず、2価である「アリーレン基」等も含む。「ヘテロアリール基」についても同様である。
また、本発明において、「水素原子」は、重水素原子及び三重水素原子も含む。
また、R1~R4、R6~R9、X1~X10及びY1~Y4の置換もしくは無置換のヘテロアリール基としては、上述の置換もしくは無置換の環形成原子数5~50のヘテロアリール基と同様の置換基が挙げられる。
これら置換基の具体例は、上述の通りである。
本発明の有機EL素子においては、好ましくは発光層がフルオランテン化合物を含み、発光層中に本発明のフルオランテン化合物が0.1~20重量%含有されていると好ましく、0.5~20重量%含有されているとさらに好ましく、1~18重量%含有されていると特に好ましく、2.5~15重量%含有されていると最も好ましい。
本発明のフルオランテン化合物を含む有機EL素子用材料を用いた有機EL素子は青色発光することができる。
R1~R8は、それぞれ独立に、水素原子、置換もしくは無置換の核炭素数6~50のアリール基、置換もしくは無置換の核原子数5~50の複素環基、置換もしくは無置換の炭素数1~50のアルキル基、置換もしくは無置換の炭素数3~50のシクロアルキル基、置換もしくは無置換の炭素数1~50のアルコキシ基、置換もしくは無置換の炭素数6~50のアラルキル基、置換もしくは無置換の核原子数5~50のアリールオキシ基、置換もしくは無置換の核原子数5~50のアリールチオ基、置換もしくは無置換の炭素数1~50のアルコキシカルボニル基、置換もしくは無置換のシリル基、カルボキシ基、ハロゲン原子、シアノ基、ニトロ基及びヒドロキシル基から選ばれる。
前記一般式(2a)において、A1とA2の少なくとも1つは、置換もしくは無置換の核原子数10~30の縮合環基を有する置換基であると好ましい。
前記置換もしくは無置換の核原子数10~30の縮合環基が置換もしくは無置換のナフタレン環であると好ましい。
一般式(2a)におけるR1~R8及び前記芳香族環の置換基の置換もしくは無置換の炭素数1~50のアルコキシカルボニル基は-COOZと表され、Zとしては、前記R1~R8及び前記芳香族環の置換基の置換もしくは無置換の炭素数1~50のアルキル基と同様の例が挙げられる。
一般式(2a)におけるR1~R8及び前記芳香族環の置換基のハロゲン原子としては、フッ素等が挙げられる。
前記R1~R8及び前記芳香族環の置換基の示す基における置換基としては、ハロゲン原子、ヒドロキシル基、ニトロ基、シアノ基、アルキル基、アリール基、シクロアルキル基、アルコキシ基、芳香族複素環基、アラルキル基、アリールオキシ基、アリールチオ基、アルコキシカルボニル基、カルボキシ基等が挙げられる。
ただし、一般式(2a’)において、中心のアントラセンの9位及び10位に、該アントラセン上に示すX-Y軸に対して対称型となる基が結合する場合はない。
L1及びL2は、それぞれ独立に、置換もしくは無置換のフェニレン基、置換もしくは無置換のナフタレニレン基、置換もしくは無置換のフルオレニレン基、及び置換もしくは無置換のジベンゾシロリレン基から選ばれる。
mは0~2の整数、nは1~4の整数、sは0~2の整数、tは0~4の整数である。
また、L1又はAr1はピレンの1~5位のいずれかに結合し、L2又はAr2はピレンの6~10位のいずれかに結合する。
また、この置換基としては、前記芳香族基で挙げたものと同様のものが挙げられる。
一般式(2b)におけるmは、好ましくは0~1の整数である。一般式(2b)におけるnは、好ましくは1~2の整数である。一般式(2b)におけるsは、好ましくは0~1の整数である。
一般式(2b)におけるtは、好ましくは0~2の整数である。
R1、R2及びR3は、それぞれ独立に、水素原子又は置換基を表す。
一般式(2c)における置換基R1、R2及びR3は、好ましくはアルキル基及びアリール基から選ばれる。
Ar11、Ar21、Ar31及びこれらのアリール基が有する置換基の少なくとも1つは核炭素数10~20の縮環アリール構造又は核炭素数6~20の縮環ヘテロアリール構造を有する。
Arは芳香族環又は複素芳香環から誘導される3価の基を表す。
一般式(2d)におけるAr11、Ar21、Ar31及びこれらのアリール基が有する置換基の少なくとも1つが有する核炭素数6~20の縮環ヘテロアリール構造としては、キノリン構造、キノキサリン構造、キナゾリン構造、アクリジン構造、フェナントリジン構造、フタラジン構造、フェナントロリン構造等が挙げられ、好ましくは、キノリン構造、キノキサリン構造、キナゾリン構造、フタラジン構造、フェナントロリン構造である。
一般式(2d)におけるArの複素芳香環から誘導される3価の基は、好ましくはヘテロ原子として窒素原子、硫黄原子及び酸素原子から選ばれる原子を含み、より好ましくは窒素原子を含む。
特に、本発明のフルオランテン化合物を用いて有機EL素子を製造する場合、有機化合物層及び発光層は、蒸着ばかりでなく、湿式でも成膜できる。
有機化合物層の各層の膜厚は特に限定されるものではないが、適切な膜厚に設定する必要がある。一般に膜厚が薄すぎるとピンホール等が発生して、電界を印加しても充分な発光輝度が得られなくなるおそれがあり、逆に厚すぎると一定の光出力を得るために高い印加電圧が必要となり効率が悪くなるため、通常、膜厚は5nm~10μmの範囲が適しているが、10nm~0.2μmの範囲がさらに好ましい。
この場合、各層を形成する有機EL材料を、適切な溶媒に溶解又は分散させて有機EL材料含有溶液を調製し、薄膜を形成するが、その溶媒はいずれであってもよい。溶媒としては、例えば、ジクロロメタン、ジクロロエタン、クロロホルム、四塩化炭素、テトラクロロエタン、トリクロロエタン、クロロベンゼン、ジクロロベンゼン、クロロトルエン、トリフルオロトルエン等のハロゲン系炭化水素系溶媒や、ジブチルエーテル、テトラヒドロフラン、テトラヒドロピラン、ジオキサン、アニソール、ジメトキシエタン、等のエーテル系溶媒、メタノールやエタノール、プロパノール、イソプロパノール、ブタノール、ペンタノール、ヘキサノール、シクロヘキサノール、メチルセロソルブ、エチルセロソルブ、エチレングリコール等のアルコール系溶媒、アセトン、メチルエチルケトン、ジエチルケトン、2-ヘキサノン、メチルイソブチルケトン、2-ヘプタノン、4-ヘプタノン、ジイソブチルケトン、アセトニルアセトン、イソホロン、シクロヘキサノン、メチルヘキサノン、アセトフェノン等のケトン系溶媒、ベンゼン、トルエン、キシレン、エチルベンゼン、ヘキサン、シクロヘキサン、オクタン、デカン、テトラリン等の炭化水素系溶媒、酢酸エチル、酢酸ブチル、酢酸アミル等のエステル系溶媒、ジメチルカーボネート、メチルエチルカーボネート、ジエチルカーボネート等の鎖状炭酸エステル系溶媒、エチレンカーボネート、プロピレンカーボネート等の環状炭酸エステル系溶媒等が挙げられる。なかでも、トルエン、ジオキサン等の炭化水素系溶媒やエーテル系溶媒が好ましい。また、これらの溶媒は一種を単独で使用しても二種以上を混合して用いてもよい。尚、使用し得る溶媒はこれらに限定されるものではない。
本発明により得られた有機EL素子の、温度、湿度、雰囲気等に対する安定性の向上のために、素子の表面に保護層を設けたり、シリコーンオイル、樹脂等により素子全体を保護することも可能である。
本発明の有機EL素子においては、好ましくは一対の電極の少なくとも一方の表面に、カルコゲニド層、ハロゲン化金属層及び金属酸化物層から選ばれる層を配置したものである。
以下、本発明の有機EL素子の素子構成について説明する。
(1)有機EL素子の構成
本発明の有機EL素子の代表的な素子構成としては、
(1) 陽極/発光層/陰極
(2) 陽極/正孔注入層/発光層/陰極
(3) 陽極/発光層/電子注入層/陰極
(4) 陽極/正孔注入層/発光層/電子注入層/陰極
(5) 陽極/有機半導体層/発光層/陰極
(6) 陽極/有機半導体層/電子障壁層/発光層/陰極
(7) 陽極/有機半導体層/発光層/付着改善層/陰極
(8) 陽極/正孔注入層/正孔輸送層/発光層/電子注入層/陰極
(9) 陽極/絶縁層/発光層/絶縁層/陰極
(10)陽極/無機半導体層/絶縁層/発光層/絶縁層/陰極
(11)陽極/有機半導体層/絶縁層/発光層/絶縁層/陰極
(12)陽極/絶縁層/正孔注入層/正孔輸送層/発光層/絶縁層/陰極
(13)陽極/絶縁層/正孔注入層/正孔輸送層/発光層/電子注入層/陰極
等の構造を挙げることができる。
これらの中で通常(8)の構成が好ましく用いられる。
本発明のフルオランテン化合物は、上記のどの有機層に用いられてもよいが、これらの構成要素の中の発光帯域もしくは正孔輸送帯域に含有されていることが好ましい。
本発明の有機EL素子は、透光性の基板上に作製する。ここでいう透光性基板は有機EL素子を支持する基板であり、400~700nmの可視領域の光の透過率が50%以上で平滑な基板が好ましい。
具体的には、ガラス板、ポリマー板等が挙げられる。ガラス板としては、特にソーダ石灰ガラス、バリウム・ストロンチウム含有ガラス、鉛ガラス、アルミノケイ酸ガラス、ホウケイ酸ガラス、バリウムホウケイ酸ガラス、石英等が挙げられる。またポリマー板としては、ポリカーボネート、アクリル、ポリエチレンテレフタレート、ポリエーテルサルフォン、ポリサルフォン等を挙げることができる。
本発明の有機EL素子の陽極は、正孔を正孔輸送層又は発光層に注入する役割を担うものであり、4.5eV以上の仕事関数を有することが効果的である。本発明に用いられる陽極材料の具体例としては、酸化インジウム錫合金(ITO)、酸化錫(NESA)、金、銀、白金、銅等が適用できる。また、陽極としては、電子輸送層又は発光層に電子を注入する目的で、仕事関数の小さい材料が好ましい。
陽極はこれらの電極物質を蒸着法やスパッタリング法等の方法で薄膜を形成させることにより作製することができる。
このように発光層からの発光を陽極から取り出す場合、陽極の発光に対する透過率が10%より大きくすることが好ましい。また、陽極のシート抵抗は、数百Ω/□以下が好ましい。陽極の膜厚は材料にもよるが、通常10nm~1μm、好ましくは10~200nmの範囲で選択される。
有機EL素子の発光層は以下の機能を併せ持つものである。即ち、
(1) 注入機能;電界印加時に陽極又は正孔注入層より正孔を注入することができ、陰極又は電子注入層より電子を注入することができる機能
(2) 輸送機能;注入した電荷(電子と正孔)を電界の力で移動させる機能
(3) 発光機能;電子と正孔の再結合の場を提供し、これを発光につなげる機能
がある。但し、正孔の注入されやすさと電子の注入されやすさに違いがあってもよく、また、正孔と電子の移動度で表される輸送能に大小があってもよいが、どちらか一方の電荷を移動することが好ましい。
ここで分子堆積膜とは、気相状態の材料化合物から沈着され形成された薄膜や、溶液状態又は液相状態の材料化合物から固体化され形成された膜のことであり、通常この分子堆積膜は、LB法により形成された薄膜(分子累積膜)とは凝集構造、高次構造の相違や、それに起因する機能的な相違により区分することができる。
また、樹脂等の結着剤と材料化合物とを溶剤に溶かして溶液とした後、これをスピンコート法等により薄膜化することによっても、発光層を形成することができる。
本発明のフルオランテン化合物を発光層に用いる場合、本発明のフルオランテン化合物は、ドーパント材料とホスト材料のいずれにも使用できるが、特にドーパント材料として用いることが好ましい。
また、本発明においては、本発明の目的が損なわれない範囲で、所望により発光層に、本発明のフルオランテン構造を有する化合物及び縮合環含有化合物からなる発光材料以外の他の公知の発光材料を含有させても良く、また本発明の発光材料を含む発光層に、他の公知の発光材料を含む発光層を積層しても良い。
さらに、発光層の膜厚は、好ましくは5~50nm、より好ましくは7~50nm、最も好ましくは10~50nmである。5nm未満では発光層形成が困難となり、色度の調整が困難となる恐れがあり、50nmを超えると駆動電圧が上昇する恐れがある。
正孔注入・輸送層は発光層への正孔注入を助け、発光領域まで輸送する層であって、正孔移動度が大きく、イオン化エネルギーが通常5.5eV以下と小さい。このような正孔注入・輸送層としては、より低い電界強度で正孔を発光層に輸送する材料が好ましく、さらに正孔の移動度が、例えば104~106V/cmの電界印加時に、少なくとも10-4cm2/V・秒であれば好ましい。
本発明のフルオランテン化合物を正孔輸送帯域に用いる場合、本発明のフルオランテン化合物単独で正孔注入、輸送層を形成してもよく、他の材料と混合して用いてもよい。
本発明のフルオランテン化合物と混合して正孔注入・輸送層を形成する材料としては、前記の好ましい性質を有するものであれば特に制限はなく、従来、光導伝材料において正孔の電荷輸送材料として慣用されているものや、有機EL素子の正孔注入・輸送層に使用される公知のものの中から任意のものを選択して用いることができる。
また、2個の縮合芳香族環を分子内に有する、例えば、4,4’-ビス(N-(1-ナフチル)-N-フェニルアミノ)ビフェニル(以下NPDと略記する)、またトリフェニルアミンユニットが3つスターバースト型に連結された4,4’,4”-トリス(N-(3-メチルフェニル)-N-フェニルアミノ)トリフェニルアミン(以下MTDATAと略記する)等を挙げることができる。
また発光層の材料として示した前述の芳香族ジメチリディン系化合物の他、p型Si、p型SiC等の無機化合物も正孔注入層の材料として使用することができる。
正孔注入・輸送層は上述した化合物を、例えば、真空蒸着法、スピンコート法、キャスト法、LB法等の公知の方法により薄膜化することにより形成することができる。正孔注入・輸送層としての膜厚は特に制限はないが、通常は5nm~5μmである。
電子注入層は、発光層への電子の注入を助ける層であって、電子移動度が大きく、また付着改善層は、この電子注入層の中で特に陰極との付着が良い材料からなる層である。電子注入層に用いられる材料としては、8-ヒドロキシキノリン又はその誘導体の金属錯体が好適である。
上記8-ヒドロキシキノリン又はその誘導体の金属錯体の具体例としては、オキシン(一般に8-キノリノール又は8-ヒドロキシキノリン)のキレートを含む金属キレートオキシノイド化合物が挙げられる。
例えば発光材料の項で記載したAlqを電子注入層として用いることができる。
この電子伝達化合物は薄膜形成性のものが好ましい。
また、より具体的に、好ましい還元性ドーパントとしては、Li(仕事関数:2.9eV)、Na(仕事関数:2.36eV)、K(仕事関数:2.28eV)、Rb(仕事関数:2.16eV)及びCs(仕事関数:1.95eV)からなる群から選択される少なくとも1つのアルカリ金属や、Ca(仕事関数:2.9eV)、Sr(仕事関数:2.0~2.5eV)、及びBa(仕事関数:2.52eV)からなる群から選択される少なくとも1つのアルカリ土類金属が挙げられる仕事関数が2.9eV以下のものが特に好ましい。これらのうち、より好ましい還元性ドーパントは、K、Rb及びCsからなる群から選択される少なくとも1つのアルカリ金属であり、さらに好ましくは、Rb又はCsであり、最も好ましのは、Csである。これらのアルカリ金属は、特に還元能力が高く、電子注入域への比較的少量の添加により、有機EL素子における発光輝度の向上や長寿命化が図られる。また、仕事関数が2.9eV以下の還元性ドーパントとして、これら2種以上のアルカリ金属の組合わせも好ましく、特に、Csを含んだ組み合わせ、例えば、CsとNa、CsとK、CsとRbあるいはCsとNaとKとの組み合わせであることが好ましい。Csを組み合わせて含むことにより、還元能力を効率的に発揮することができ、電子注入域への添加により、有機EL素子における発光輝度の向上や長寿命化が図られる。
陰極としては、電子注入・輸送層又は発光層に電子を注入するため、仕事関数の小さい(4eV以下)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・銀合金、アルミニウム/酸化アルミニウム、アルミニウム・リチウム合金、インジウム、希土類金属等が挙げられる。
この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。
ここで発光層からの発光を陰極から取り出す場合、陰極の発光に対する透過率は10%より大きくすることが好ましい。
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~1μm、好ましくは50~200nmである。
有機EL素子は超薄膜に電界を印可するために、リークやショートによる画素欠陥が生じやすい。これを防止するために、一対の電極間に絶縁性の薄膜層を挿入することが好ましい。
絶縁層に用いられる材料としては例えば酸化アルミニウム、弗化リチウム、酸化リチウム、弗化セシウム、酸化セシウム、酸化マグネシウム、弗化マグネシウム、酸化カルシウム、弗化カルシウム、窒化アルミニウム、酸化チタン、酸化珪素、酸化ゲルマニウム、窒化珪素、窒化ホウ素、酸化モリブデン、酸化ルテニウム、酸化バナジウム等が挙げられる。
これらの混合物や積層物を用いてもよい。
以上例示した材料及び形成方法により陽極、発光層、必要に応じて正孔注入層、及び必要に応じて電子注入層を形成し、さらに陰極を形成することにより有機EL素子を作製することができる。また陰極から陽極へ、前記と逆の順序で有機EL素子を作製することもできる。
以下、透光性基板上に陽極/正孔注入層/発光層/電子注入層/陰極が順次設けられた構成の有機EL素子の作製例を記載する。
まず適当な透光性基板上に陽極材料からなる薄膜を1μm以下、好ましくは10~200nmの範囲の膜厚になるように蒸着やスパッタリング等の方法により形成して陽極を作製する。次にこの陽極上に正孔注入層を設ける。正孔注入層の形成は、前述したように真空蒸着法、スピンコート法、キャスト法、LB法等の方法により行うことができるが、均質な膜が得られやすく、かつピンホールが発生しにくい等の点から真空蒸着法により形成することが好ましい。真空蒸着法により正孔注入層を形成する場合、その蒸着条件は使用する化合物(正孔注入層の材料)、目的とする正孔注入層の結晶構造や再結合構造等により異なるが、一般に蒸着源温度50~450℃、真空度10-7~10-3Torr、蒸着速度0.01~50nm/秒、基板温度-50~300℃、膜厚5nm~5μmの範囲で適宜選択することが好ましい。
次に、この発光層上に電子注入層を設ける。正孔注入層、発光層と同様、均質な膜を得る必要から真空蒸着法により形成することが好ましい。蒸着条件は正孔注入層、発光層と同様の条件範囲から選択することができる。
本発明の化合物は、発光帯域や正孔輸送帯域のいずれの層に含有させるかによって異なるが、真空蒸着法を用いる場合は他の材料との共蒸着をすることができる。また、スピンコート法を用いる場合は、他の材料と混合することによって含有させることができる。
最後に陰極を積層して有機EL素子を得ることができる。
陰極は金属から構成されるもので、蒸着法、スパッタリングを用いることができる。しかし下地の有機物層を製膜時の損傷から守るためには真空蒸着法が好ましい。
これまで記載してきた有機EL素子の作製は一回の真空引きで一貫して陽極から陰極まで作製することが好ましい。
尚、有機EL素子に直流電圧を印加する場合、陽極を+、陰極を-の極性にして、5~40Vの電圧を印加すると発光が観測できる。また、逆の極性で電圧を印加しても電流は流れず、発光は全く生じない。さらに交流電圧を印加した場合には陽極が+、陰極が-の極性になった時のみ均一な発光が観測される。印加する交流の波形は任意でよい。
本発明の有機EL素子は、低電圧であっても高発光効率が求められる製品に応用が可能である。応用例としては、表示装置、ディスプレイ、照明装置、プリンター光源、液晶表示装置のバックライト等が挙げられ、標識、看板、インテリア等の分野にも適用できる。表示装置としては、省エネルギーや高視認性のフラットパネルディスプレイが挙げられる。また、プリンター光源としては、レーザービームプリンタの光源として使用することができる。また、本発明の素子を用いることで、装置体積を大幅に減少することもできる。照明装置やバックライトに関しては、本発明の有機EL素子を用いることで省エネルギー効果が期待できる。
[5-ブロモアセナフチレンの合成]
5-ブロモアセナフテン25.4g(107.3mmol)、脱水ベンゼン500mlに、2,3-ジクロロ-5,6-ジシアノ-1,4-ベンゾキノン(DDQ)29.2g(128.7mmol)を加え、加熱還流下、6時間攪拌した。さらに、反応混合物にDDQ6.0g(26.4mmol)を加え、4時間加熱攪拌した。放冷後、沈殿物を濾別し、クロロホルムで洗浄した。濾液を合わせて、10%水酸化ナトリウム水溶液、水で洗浄した。分液後、有機相を無水硫酸ナトリウムで乾燥し、溶媒を留去した。減圧下、乾燥し、褐色の固体、5-ブロモアセナフチレン13.0g(収率51.6%)を得た。
[3-ブロモ-7,12-ジベンゾ[k]フルオランテンの合成]
1,3-ジフェニルイソベンゾフラン14.9g(55.2mmol)、合成例1で調製した5-ブロモ-アセナフチレン12.8g(55.2mmol)のトルエン50mlの混合物を加熱還流下、16時間攪拌した。溶媒を留去後、酢酸1200mlを加え、80℃に加熱した。この混合物に、48%HBr水溶液150mlを加え、80℃にて1時間攪拌した。室温まで冷却後、沈殿物を濾取し、メタノールで洗浄した。得られた黄色固体をトルエン200mlで再結晶化した。結晶を濾取し、黄色固体、3-ブロモ-7,12-ジベンゾ[k]フルオランテン19.8g(収率:74%)を得た。
[7,12-ジベンゾ[k]フルオランテン-3-イルボロン酸の合成]
合成例2で調製した3-ブロモ-7,12-ジベンゾ[k]フルオランテン30.8g(64.0mmol)を脱水テトラヒドロフラン400ml、脱水トルエン300mlに溶解させ、-70℃に冷却し、n-ブチルリチウム44.6ml(70.4mmol)を滴下して1時間撹拌し、トリイソプリピルボロン酸エステル44.0ml(192mmol)を加え、2時間かけて室温まで昇温した。沈殿物を濾取し、トルエンで洗浄し、減圧下、乾燥し、黄色の固体7,12-ジフェニルベンゾ[k]フルオランテン-3-イルボロン酸25.14g(収率88%)を得た。
アルゴン気流下、500mLのナスフラスコに、ジベンゾフラン20.5g、脱水テトラヒドロフラン90mLを入れ、-68℃に冷却した後、n-ブチルリチウムヘキサン溶液(1.57M)77.3mLを入れ、-20℃に昇温して1時間撹拌した。再度-68℃に冷却し、トリイソプロピルボロン酸エステルを83.4mL滴下した後、徐々に昇温し、室温下5時間反応した。3N塩酸、酢酸エチルを加えて分液、抽出した後、上水、飽和食塩水で有機層を洗浄、硫酸ナトリウムで乾燥し、濃縮して得られた租生成物をトルエンで再結晶して得られた固体を減圧乾燥したところ16.1gの白色固体を得た。FD-MS(フィールドディソープションマススペクトル)の分析により、白色固体を中間体Aと同定した。
アルゴン気流下、中間体A4.0g、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチル7.1g、テトラキス(トルフェニルホスフィン)パラジウム(0)〔Pd(PPh3)4〕660mg、炭酸ナトリウム6.0g(上水29mL)、及びジメトキシエタンを入れ、還流にて7時間反応した。冷却後、反応溶液をろ過し、得られた固体をメタノール、上水で洗浄し、シリカゲルクロマトグラフィー(トルエン/ヘキサン(15/85))で精製し、減圧乾燥したところ、3.0gの白色固体を得た。FD-MSの分析により、白色固体を中間体Bと同定した。
中間体Bの合成において、中間体Aの代わりに合成例3で調製した7,12-ジフェニルベンゾ[k]フルオランテン-3-イルボロン酸を用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに中間体Bを用い、ジメトキシエタンの代わりにトルエン及びジメトキシエタンの混合溶媒を用いた他は同様にして反応を行い、化合物1を合成した。
得られた化合物1のFDMS、トルエン溶液中の紫外線吸収極大波長λmax、及び蛍光発光極大波長を以下に示す。
FDMS, calcd for C54H32O=696, found m/z=696(M+)
UV(PhMe);λmax, 423nm、FL(PhMe,λex=380nm);λmax,441nm
実施例1の中間体Bの合成において、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに1-ブロモ-4-ヨードベンゼンを用いた他は同様にして反応を行って、中間体Cを合成した。
FD-MSの分析により、中間体Cと同定した。
実施例1の中間体Bの合成において、中間体Aの代わりに7,12-ジフェニルベンゾ[k]フルオランテン-3-イルボロン酸を用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに中間体Cを用い、ジメトキシエタンの代わりにトルエン及びジメトキシエタンの混合溶媒を用いた他は同様にして反応を行って、化合物2を合成した。
得られた化合物2のFDMS、トルエン溶液中の紫外線吸収極大波長λmax、及び蛍光発光極大波長を示す。
FDMS, calcd for C50H30O=646, found m/z=646(M+)
UV(PhMe);λmax, 422nm、FL(PhMe,λex=380nm);λmax, 439nm
アルゴン気流下、ジベンゾフラン13.5g、塩化鉄(III)389mg、脱水クロロホルム135mを入れ、140℃に冷却した後、臭素12.9gを30分かけて滴下し、徐々に室温まで昇温して5時間反応した。この反応液に飽和亜硫酸ナトリウム水溶液を加えて分液し、有機層を濃縮して得られた租生成物をヘキサンに過熱溶解させ、結晶を析出させた後ろ過した。この再結晶を4回繰り返し、活性炭処理をし、得られた固体を減圧乾燥したところ、8.2gの白色固体を得た。FD-MSの分析により、得られた白色固体を中間体Dと同定した。
実施例1の中間体Aの合成において、ジベンゾフランの代わりに中間体Dを用いた他は同様にして反応を行って、中間体Eを合成した。
FD-MSの分析により、中間体Eと同定した。
実施例1の中間体Bの合成において、中間体Aの代わりに中間体Eを用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに1-ブロモ-4-ヨードベンゼンを用いた他は同様にして反応を行って、中間体Fを合成した。
FD-MS(フィールドディソープションマススペクトル)の分析により、中間体Fと同定した。
実施例1の中間体Bの合成において、中間体Aの代わりに7,12-ジフェニルベンゾ[k]フルオランテン-3-イルボロン酸を用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに中間体Fを用い、ジメトキシエタンの代わりにトルエン及びジメトキシエタンの混合溶媒を用いた他は同様にして反応を行って、化合物3を合成した。
得られた化合物3のFDMS、トルエン溶液中の紫外線吸収極大波長λmax、及び蛍光発光極大波長を示す。
FDMS, calcd for C50H30O=646, found m/z=646(M+)
UV(PhMe);λmax, 422nm、FL(PhMe,λex=378nm);λmax, 439nm
実施例1の中間体Bの合成において、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに4、4’-ジブロモビフェニルを用い、中間体Aの代わりに中間体Eを用いた他は同様にして反応を行って、中間体Gを合成した。
FD-MSの分析により、中間体Gと同定した。
実施例1の中間体Bの合成において、中間体Aの代わりに7,12-ジフェニルベンゾ[k]フルオランテン-3-イルボロン酸を用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに中間体Gを用い、ジメトキシエタンの代わりにトルエン及びジメトキシエタンの混合溶媒を用いた他は同様にして反応を行って、化合物4を合成した。
得られた化合物4のFDMS、トルエン溶液中の紫外線吸収極大波長λmax、及び蛍光発光極大波長を示す。
FDMS, calcd for C56H34O=722, found m/z=722(M+)
UV(PhMe);λmax, 423nm、FL(PhMe,λex=380nm);λmax, 440nm
実施例1の中間体Bの合成において、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに1、4-ジブロモナフタレンを用いた他は同様にして反応を行って、中間体Hを合成した。
FD-MSの分析により、中間体Hと同定した。
実施例1の中間体Bの合成において、中間体Aの代わりに7,12-ジフェニルベンゾ[k]フルオランテン-3-イルボロン酸を用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに中間体Hを用い、ジメトキシエタンの代わりにトルエン、ジメトキシエタンの混合溶媒を用いた他は同様にして反応を行って、化合物5を合成した。
得られた化合物5のFDMS、トルエン溶液中の紫外線吸収極大波長λmax、及び蛍光発光極大波長を示す。
FDMS, calcd for C54H32O=696, found m/z=696(M+)
UV(PhMe);λmax, 417nm、FL(PhMe,λex=375nm);λmax, 436nm
実施例1の中間体Bの合成において、中間体Aの代わりに中間体Eを用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに1、4-ジブロモナフタレンを用いた他は同様にして反応を行って、中間体Iを合成した。
FD-MSの分析により、中間体Iと同定した。
実施例1の中間体Bの合成において、中間体Aの代わりに7,12-ジフェニルベンゾ[k]フルオランテン-3-イルボロン酸を用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに中間体Iを用い、ジメトキシエタンの代わりにトルエン、ジメトキシエタンの混合溶媒を用いた他は同様にして反応を行って、化合物6を合成した。
得られた化合物6のFDMS、トルエン溶液中の紫外線吸収極大波長λmax、及び蛍光発光極大波長を示す。
FDMS, calcd for C54H32O=696, found m/z=696(M+)
UV(PhMe);λmax, 417nm、FL(PhMe,λex=375nm);λmax, 436nm
実施例1の中間体Bの合成において、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに1-ブロモ-3-ヨードベンゼンを用いた他は同様にして反応を行って、中間体Jを合成した。
FD-MSの分析により、中間体Jと同定した。
実施例1の中間体Bの合成において、中間体Aの代わりに7,12-ジフェニルベンゾ[k]フルオランテン-3-イルボロン酸を用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに中間体Jを用い、ジメトキシエタンの代わりにトルエン、ジメトキシエタンの混合溶媒を用いた他は同様にして反応を行って、化合物7を合成した。
得られた化合物7のFDMS、トルエン溶液中の紫外線吸収極大波長λmax、及び蛍光発光極大波長を示す。
FDMS, calcd for C50H30O=646, found m/z=646(M+)
UV(PhMe);λmax, 420nm、FL(PhMe,λex=375nm);λmax, 433nm
化合物8を下記スキームに従って合成した。
実施例1の中間体Bの合成において、中間体Aの代わりに中間体Eを用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに1-ブロモ-3-ヨードベンゼンを用いた他は同様にして反応を行って、中間体Kを合成した。
FD-MSの分析により、中間体Kと同定した。
[化合物8の合成]
実施例1の中間体Bの合成において、中間体Aの代わりに7,12-ジフェニルベンゾ[k]フルオランテン-3-イルボロン酸を用い、トリフルオロメタンスルホン酸6-ブロモ-2-ナフチルの代わりに中間体Kを用い、ジメトキシエタンの代わりにトルエン、ジメトキシエタンの混合溶媒を用いた他は同様にして反応を行って、化合物8を合成した。
得られた化合物8のFDMS、トルエン溶液中の紫外線吸収極大波長λmax、及び蛍光発光極大波長を示す。
FDMS, calcd for C50H30O=646, found m/z=646(M+)
UV(PhMe);λmax, 420nm、FL(PhMe,λex=375nm);λmax, 434nm
25mm×75mm×1.1mm厚のITO透明電極(陽極)付きガラス基板(ジオマティック社製)をイソプロピルアルコール中で超音波洗浄を5分間行った後、UVオゾン洗浄を30分間行った。洗浄後の透明電極ライン付きガラス基板を真空蒸着装置の基板ホルダーに装着し、まず透明電極ラインが形成されている
側の面上に前記透明電極を覆うようにして、正孔注入層として膜厚60nmの化合物A-1を蒸着により成膜した。A-1膜の成膜に続けて、このA-1膜上に正孔輸送層として膜厚20nmの化合物A-2を蒸着により成膜した。
このA-2膜上に膜厚40nmでホスト材料である化合物H-1とドーパント材料である実施例1で調製した化合物1を40:2の膜厚比で同時蒸着し成膜した。この膜上に電子輸送層として膜厚40nmで化合物A-3を蒸着により成膜した。次に、弗化リチウムを1nmの厚さに蒸着し、次いでアルミニウムを150nmの厚さに蒸着した。このアルミニウム/弗化リチウムは陰極として働く。このようにして有機EL素子を作製した。
本発明の有機EL素子は、実用性が高く、壁掛テレビの平面発光体やディスプレイのバックライト等の光源として有用である。本発明のフルオランテン化合物は、有機EL素子の正孔注入・輸送材料、さらには電子写真感光体や有機半導体の電荷輸送材料としても用いることができる。
この明細書に記載の文献の内容を全てここに援用する。
Claims (20)
- 下記式(1)で表されるフルオランテン化合物。
Ar0は、単結合、置換もしくは無置換の環形成炭素数5~50のアリール基、又は置換もしくは無置換の環形成原子数5~50のヘテロアリール基であり、R1~R4及びR6~R9のいずれか1つと結合する連結基である。
R1~R4、R6~R9は、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、置換もしくは無置換のアリール基、置換もしくは無置換のヘテロアリール基、又は置換シリル基であるか、又はR1とR2、R2とR3、R3とR4、R6とR7、R7とR8、並びにR8とR9は、それぞれ互いに結合して、飽和もしくは不飽和の環状構造を形成する。前記環状構造はさらに置換基を有してもよい。
lは、1~4の整数であり、lが2以上の場合、複数のAr0はそれぞれ同じでも異なってもよく、互いに隣接するAr0の置換基同士が架橋してもよい。) - Z7及びZ12が、それぞれ独立にフェニル基、ナフチル基、フルオレニル基、9,9’-ジメチルフルオレニル基、ジエチルフルオレニル基、ジプロピルフルオレニル基、ジイソプロピルフルオレニル基、ジブチルフルオレニル基、ジフェニルフルオレニル基、又はフェナントリル基である請求項1~7のいずれかに記載のフルオランテン化合物。
- 一対の電極間に少なくとも発光層を含む1層又は複数層からなる有機化合物層を挟持する有機エレクトロルミネッセンス素子であって、
前記有機化合物層の少なくとも1層が請求項1~8のいずれかに記載のフルオランテン化合物を少なくとも1種含む有機エレクトロルミネッセンス素子。 - 前記発光層が前記フルオランテン化合物を含む請求項9に記載の有機エレクトロルミネッセンス素子。
- 前記発光層中の前記フルオランテン化合物の含有量が0.01~20質量%である請求項10に記載の有機エレクトロルミネッセンス素子。
- 前記発光層が、さらにアントラセン中心骨格を有する下記式(2a)で表される化合物を含む請求項10又は11に記載の有機エレクトロルミネッセンス素子。
前記置換基は、置換もしくは無置換の環形成炭素数6~50のアリール基、置換もしくは無置換の炭素数1~50のアルキル基、置換もしくは無置換の炭素数3~50のシクロアルキル基、置換もしくは無置換の炭素数1~50のアルコキシ基、
置換もしくは無置換の炭素数6~50のアラルキル基、置換もしくは無置換の環形成原子数5~50のアリールオキシ基、置換もしくは無置換の環形成原子数5~50のアリールチオ基、置換もしくは無置換の炭素数1~50のアルコキシカルボニル基、置換もしくは無置換のシリル基、カルボキシル基、ハロゲン原子、シアノ基、ニトロ基、又はヒドロキシル基である。
前記芳香族環が2以上の置換基で置換されている場合、前記置換基は同一であっても異なっていてもよく、隣接する置換基同士は互いに結合して飽和又は不飽和の環状構造を形成していてもよい。
R1~R8は、それぞれ独立に、水素原子、置換もしくは無置換の環形成炭素数6~50のアリール基、置換もしくは無置換の環形成原子数5~50のヘテロアリール基、置換もしくは無置換の炭素数1~50のアルキル基、置換もしくは無置換の炭素数3~50のシクロアルキル基、置換もしくは無置換の炭素数1~50のアルコキシ基、置換もしくは無置換の炭素数6~50のアラルキル基、置換もしくは無置換の環形成原子数5~50のアリールオキシ基、置換もしくは無置換の環形成原子数5~50のアリールチオ基、置換もしくは無置換の炭素数1~50のアルコキシカルボニル基、置換もしくは無置換のシリル基、カルボキシル基、ハロゲン原子、シアノ基、ニトロ基、又はヒドロキシル基である。) - A1とA2が互いに異なる置換基である請求項12に記載の有機エレクトロルミネッセンス素子。
- A1及びA2の少なくとも1つが、置換もしくは無置換の環形成原子数10~30の縮合環基を有する置換基である請求項12に記載の有機エレクトロルミネッセンス素子。
- 置換もしくは無置換の環形成原子数10~30の縮合環基が、置換もしくは無置換のナフタレン環である請求項14に記載の有機エレクトロルミネッセンス素子。
- 前記発光層が、さらにピレン中心骨格を有する下記式(2b)で表される化合物を含む請求項10又は11に記載の有機エレクトロルミネッセンス素子。
L1及びL2は、それぞれ独立に、置換もしくは無置換のフェニレン基、置換もしくは無置換のナフタレニレン基、置換もしくは無置換のフルオレニレン基、又は置換もしくは無置換のジベンゾシロリレン基である。
mは0~2の整数、nは1~4の整数、sは0~2の整数、tは0~4の整数である。
L1又はAr1は、ピレンの1~5位のいずれかに結合し、L2又はAr2はピレンの6~10位のいずれかに結合する。) - 前記発光層が、さらにトリフェニルアミン骨格を有する下記式(2c)で表される化合物を含む請求項10又は11に記載の有機エレクトロルミネッセンス素子。
R1、R2及びR3は、それぞれ独立に、水素原子又は置換基である。) - 有機エレクトロルミネッセンス材料である請求項1~8のいずれかに記載のフルオランテン化合物、及び溶媒とを含有する有機エレクトロルミネッセンス材料含有溶液。
- 前記有機エレクトロルミネッセンス材料が、ホスト材料及びドーパント材料とを含み、
前記ドーパント材料が、請求項1~8のいずれかに記載のフルオランテン化合物であり、
前記ホスト材料が、請求項12の式(2a)で表される化合物、請求項16の式(2b)で表される化合物、請求項17の式(2c)で表される化合物、及び請求項18の式(2d)で表される化合物から選ばれる少なくとも1種である請求項19に記載の有機エレクトロルミネッセンス材料含有溶液。
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JP6269060B2 (ja) * | 2012-06-12 | 2018-01-31 | 東レ株式会社 | 発光素子材料および発光素子 |
EP3368520B1 (en) * | 2015-10-27 | 2023-04-26 | Merck Patent GmbH | Materials for organic electroluminescent devices |
CN105669466B (zh) * | 2016-03-16 | 2018-08-10 | 上海道亦化工科技有限公司 | 一种基于荧蒽的化合物及其有机电致发光器件 |
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