WO2004034751A1 - 有機エレクトロルミネッセンス素子 - Google Patents
有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2004034751A1 WO2004034751A1 PCT/JP2003/012598 JP0312598W WO2004034751A1 WO 2004034751 A1 WO2004034751 A1 WO 2004034751A1 JP 0312598 W JP0312598 W JP 0312598W WO 2004034751 A1 WO2004034751 A1 WO 2004034751A1
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- light emitting
- emitting layer
- electron
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- 239000000463 material Substances 0.000 claims abstract description 190
- 238000002347 injection Methods 0.000 claims abstract description 84
- 239000007924 injection Substances 0.000 claims abstract description 84
- -1 phenylviridine Chemical compound 0.000 claims description 528
- 150000001875 compounds Chemical class 0.000 claims description 48
- 125000003118 aryl group Chemical group 0.000 claims description 38
- 230000005525 hole transport Effects 0.000 claims description 37
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 36
- 150000004696 coordination complex Chemical class 0.000 claims description 25
- 125000001424 substituent group Chemical group 0.000 claims description 22
- 239000002019 doping agent Substances 0.000 claims description 19
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 18
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 claims description 16
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 13
- XSCHRSMBECNVNS-UHFFFAOYSA-N quinoxaline Chemical compound N1=CC=NC2=CC=CC=C21 XSCHRSMBECNVNS-UHFFFAOYSA-N 0.000 claims description 13
- 125000000732 arylene group Chemical group 0.000 claims description 12
- GVEPBJHOBDJJJI-UHFFFAOYSA-N fluoranthrene Natural products C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=C1 GVEPBJHOBDJJJI-UHFFFAOYSA-N 0.000 claims description 9
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 8
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 claims description 8
- 125000000609 carbazolyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3NC12)* 0.000 claims description 7
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 claims description 6
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 claims description 6
- WDECIBYCCFPHNR-UHFFFAOYSA-N chrysene Chemical compound C1=CC=CC2=CC=C3C4=CC=CC=C4C=CC3=C21 WDECIBYCCFPHNR-UHFFFAOYSA-N 0.000 claims description 6
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 claims description 6
- BBEAQIROQSPTKN-UHFFFAOYSA-N pyrene Chemical compound C1=CC=C2C=CC3=CC=CC4=CC=C1C2=C43 BBEAQIROQSPTKN-UHFFFAOYSA-N 0.000 claims description 6
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 6
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 5
- WZJYKHNJTSNBHV-UHFFFAOYSA-N benzo[h]quinoline Chemical compound C1=CN=C2C3=CC=CC=C3C=CC2=C1 WZJYKHNJTSNBHV-UHFFFAOYSA-N 0.000 claims description 5
- 238000005401 electroluminescence Methods 0.000 claims description 5
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 5
- GAMYYCRTACQSBR-UHFFFAOYSA-N 4-azabenzimidazole Chemical compound C1=CC=C2NC=NC2=N1 GAMYYCRTACQSBR-UHFFFAOYSA-N 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 4
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical compound C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 claims description 4
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 claims description 3
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 claims description 3
- LISFMEBWQUVKPJ-UHFFFAOYSA-N quinolin-2-ol Chemical compound C1=CC=C2NC(=O)C=CC2=C1 LISFMEBWQUVKPJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000004020 luminiscence type Methods 0.000 claims description 2
- DGEZNRSVGBDHLK-UHFFFAOYSA-N [1,10]phenanthroline Chemical compound C1=CN=C2C3=NC=CC=C3C=CC2=C1 DGEZNRSVGBDHLK-UHFFFAOYSA-N 0.000 claims 1
- XDLDASNSMGOEMX-UHFFFAOYSA-N benzene benzene Chemical compound C1=CC=CC=C1.C1=CC=CC=C1 XDLDASNSMGOEMX-UHFFFAOYSA-N 0.000 claims 1
- 239000010410 layer Substances 0.000 description 289
- 125000004432 carbon atom Chemical group C* 0.000 description 51
- 230000032258 transport Effects 0.000 description 40
- 125000000217 alkyl group Chemical group 0.000 description 28
- 239000010408 film Substances 0.000 description 28
- 125000003545 alkoxy group Chemical group 0.000 description 26
- 125000006615 aromatic heterocyclic group Chemical group 0.000 description 24
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 20
- 230000005281 excited state Effects 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 17
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 description 16
- 230000000903 blocking effect Effects 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 16
- 239000002184 metal Substances 0.000 description 16
- 239000007983 Tris buffer Substances 0.000 description 15
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 15
- 125000005843 halogen group Chemical group 0.000 description 14
- 125000003342 alkenyl group Chemical group 0.000 description 13
- 125000004104 aryloxy group Chemical group 0.000 description 13
- 125000004093 cyano group Chemical group *C#N 0.000 description 12
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 12
- 229960003540 oxyquinoline Drugs 0.000 description 12
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 12
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical class C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 12
- 125000003277 amino group Chemical group 0.000 description 11
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 11
- 125000001931 aliphatic group Chemical group 0.000 description 10
- 125000003710 aryl alkyl group Chemical group 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 10
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 10
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 9
- 125000004453 alkoxycarbonyl group Chemical group 0.000 description 9
- 125000000623 heterocyclic group Chemical group 0.000 description 9
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 9
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 9
- 239000000758 substrate Substances 0.000 description 9
- 229910052783 alkali metal Inorganic materials 0.000 description 8
- 125000004218 chloromethyl group Chemical group [H]C([H])(Cl)* 0.000 description 8
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical group C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 8
- 125000001072 heteroaryl group Chemical group 0.000 description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 8
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 125000001340 2-chloroethyl group Chemical group [H]C([H])(Cl)C([H])([H])* 0.000 description 7
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 7
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 7
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 7
- 125000006083 1-bromoethyl group Chemical group 0.000 description 6
- 125000004066 1-hydroxyethyl group Chemical group [H]OC([H])([*])C([H])([H])[H] 0.000 description 6
- 125000001637 1-naphthyl group Chemical group [H]C1=C([H])C([H])=C2C(*)=C([H])C([H])=C([H])C2=C1[H] 0.000 description 6
- 125000005999 2-bromoethyl group Chemical group 0.000 description 6
- 125000001731 2-cyanoethyl group Chemical group [H]C([H])(*)C([H])([H])C#N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 6
- 125000002252 acyl group Chemical group 0.000 description 6
- 125000004202 aminomethyl group Chemical group [H]N([H])C([H])([H])* 0.000 description 6
- 150000004945 aromatic hydrocarbons Chemical group 0.000 description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 6
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 6
- 125000001041 indolyl group Chemical group 0.000 description 6
- 125000005956 isoquinolyl group Chemical group 0.000 description 6
- 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 6
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 6
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 6
- 125000001624 naphthyl group Chemical group 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 230000006798 recombination Effects 0.000 description 6
- 238000005215 recombination Methods 0.000 description 6
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 5
- 150000001340 alkali metals Chemical class 0.000 description 5
- 125000004429 atom Chemical group 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 5
- 125000005997 bromomethyl group Chemical group 0.000 description 5
- 125000000753 cycloalkyl group Chemical group 0.000 description 5
- 150000004820 halides Chemical class 0.000 description 5
- 239000003446 ligand Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 125000005493 quinolyl group Chemical group 0.000 description 5
- 229910052761 rare earth metal Inorganic materials 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- 125000001478 1-chloroethyl group Chemical group [H]C([H])([H])C([H])(Cl)* 0.000 description 4
- CFOIBEJBQITLOX-UHFFFAOYSA-N 2,9-phenanthroline Chemical group C1=CN=CC2=C(C=NC=C3)C3=CC=C21 CFOIBEJBQITLOX-UHFFFAOYSA-N 0.000 description 4
- 125000000022 2-aminoethyl group Chemical group [H]C([*])([H])C([H])([H])N([H])[H] 0.000 description 4
- 125000001622 2-naphthyl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C(*)C([H])=C([H])C2=C1[H] 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- KYQCOXFCLRTKLS-UHFFFAOYSA-N Pyrazine Chemical compound C1=CN=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-N 0.000 description 4
- 150000001342 alkaline earth metals Chemical class 0.000 description 4
- 125000002947 alkylene group Chemical group 0.000 description 4
- 125000000304 alkynyl group Chemical group 0.000 description 4
- 125000002078 anthracen-1-yl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C3C([*])=C([H])C([H])=C([H])C3=C([H])C2=C1[H] 0.000 description 4
- 125000000748 anthracen-2-yl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C3C([H])=C([*])C([H])=C([H])C3=C([H])C2=C1[H] 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000004305 biphenyl Chemical group 0.000 description 4
- 235000010290 biphenyl Nutrition 0.000 description 4
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- 230000009849 deactivation Effects 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 125000001188 haloalkyl group Chemical group 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 4
- 125000002524 organometallic group Chemical group 0.000 description 4
- 125000002971 oxazolyl group Chemical group 0.000 description 4
- 125000001037 p-tolyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1*)C([H])([H])[H] 0.000 description 4
- 125000004076 pyridyl group Chemical group 0.000 description 4
- 150000002910 rare earth metals Chemical class 0.000 description 4
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 description 3
- 125000002941 2-furyl group Chemical group O1C([*])=C([H])C([H])=C1[H] 0.000 description 3
- 125000000389 2-pyrrolyl group Chemical group [H]N1C([*])=C([H])C([H])=C1[H] 0.000 description 3
- 125000001397 3-pyrrolyl group Chemical group [H]N1C([H])=C([*])C([H])=C1[H] 0.000 description 3
- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Chemical compound C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 150000001339 alkali metal compounds Chemical class 0.000 description 3
- 150000001341 alkaline earth metal compounds Chemical class 0.000 description 3
- 125000003282 alkyl amino group Chemical group 0.000 description 3
- 125000004397 aminosulfonyl group Chemical group NS(=O)(=O)* 0.000 description 3
- 125000005428 anthryl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C3C(*)=C([H])C([H])=C([H])C3=C([H])C2=C1[H] 0.000 description 3
- 125000005110 aryl thio group Chemical group 0.000 description 3
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical group C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 150000001721 carbon Chemical group 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 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
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 3
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- 230000005684 electric field Effects 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
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- 238000010438 heat treatment Methods 0.000 description 3
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- 125000000040 m-tolyl group Chemical group [H]C1=C([H])C(*)=C([H])C(=C1[H])C([H])([H])[H] 0.000 description 3
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- 238000002366 time-of-flight method Methods 0.000 description 3
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- YJTKZCDBKVTVBY-UHFFFAOYSA-N 1,3-Diphenylbenzene Chemical group C1=CC=CC=C1C1=CC=CC(C=2C=CC=CC=2)=C1 YJTKZCDBKVTVBY-UHFFFAOYSA-N 0.000 description 2
- FLBAYUMRQUHISI-UHFFFAOYSA-N 1,8-naphthyridine Chemical compound N1=CC=CC2=CC=CN=C21 FLBAYUMRQUHISI-UHFFFAOYSA-N 0.000 description 2
- LLAPDLPYIYKTGQ-UHFFFAOYSA-N 1-aminoethyl Chemical group C[CH]N LLAPDLPYIYKTGQ-UHFFFAOYSA-N 0.000 description 2
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- PCNDJXKNXGMECE-UHFFFAOYSA-N Phenazine Natural products C1=CC=CC2=NC3=CC=CC=C3N=C21 PCNDJXKNXGMECE-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
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- NQRYJNQNLNOLGT-UHFFFAOYSA-N Piperidine Chemical compound C1CCNCC1 NQRYJNQNLNOLGT-UHFFFAOYSA-N 0.000 description 2
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910052769 Ytterbium Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- DZBUGLKDJFMEHC-UHFFFAOYSA-N acridine Chemical compound C1=CC=CC2=CC3=CC=CC=C3N=C21 DZBUGLKDJFMEHC-UHFFFAOYSA-N 0.000 description 2
- 125000004423 acyloxy group Chemical group 0.000 description 2
- 229910001508 alkali metal halide Inorganic materials 0.000 description 2
- 150000008045 alkali metal halides Chemical class 0.000 description 2
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- 125000004466 alkoxycarbonylamino group Chemical group 0.000 description 2
- 125000004414 alkyl thio group Chemical group 0.000 description 2
- 125000001691 aryl alkyl amino group Chemical group 0.000 description 2
- 125000005162 aryl oxy carbonyl amino group Chemical group 0.000 description 2
- 125000005161 aryl oxy carbonyl group Chemical group 0.000 description 2
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- 125000003785 benzimidazolyl group Chemical group N1=C(NC2=C1C=CC=C2)* 0.000 description 2
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- 125000000904 isoindolyl group Chemical group C=1(NC=C2C=CC=CC12)* 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 125000003564 m-cyanobenzyl group Chemical group [H]C1=C([H])C(=C([H])C(C#N)=C1[H])C([H])([H])* 0.000 description 1
- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 229940102016 monocal Drugs 0.000 description 1
- 125000002950 monocyclic group Chemical group 0.000 description 1
- 125000004957 naphthylene group Chemical group 0.000 description 1
- YCWSUKQGVSGXJO-NTUHNPAUSA-N nifuroxazide Chemical group C1=CC(O)=CC=C1C(=O)N\N=C\C1=CC=C([N+]([O-])=O)O1 YCWSUKQGVSGXJO-NTUHNPAUSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 125000003261 o-tolyl group Chemical group [H]C1=C([H])C(*)=C(C([H])=C1[H])C([H])([H])[H] 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 125000006505 p-cyanobenzyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1C#N)C([H])([H])* 0.000 description 1
- 125000006503 p-nitrobenzyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1[N+]([O-])=O)C([H])([H])* 0.000 description 1
- 125000000538 pentafluorophenyl group Chemical group FC1=C(F)C(F)=C(*)C(F)=C1F 0.000 description 1
- 125000004817 pentamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- 125000005062 perfluorophenyl group Chemical group FC1=C(C(=C(C(=C1F)F)F)F)* 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 125000004934 phenanthridinyl group Chemical group C1(=CC=CC2=NC=C3C=CC=CC3=C12)* 0.000 description 1
- 125000001791 phenazinyl group Chemical group C1(=CC=CC2=NC3=CC=CC=C3N=C12)* 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 description 1
- 150000004713 phosphodiesters Chemical class 0.000 description 1
- 238000001296 phosphorescence spectrum Methods 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 239000006187 pill Substances 0.000 description 1
- 229920001088 polycarbazole Polymers 0.000 description 1
- 150000004032 porphyrins Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- CPNGPNLZQNNVQM-UHFFFAOYSA-N pteridine Chemical compound N1=CN=CC2=NC=CN=C21 CPNGPNLZQNNVQM-UHFFFAOYSA-N 0.000 description 1
- 235000011962 puddings Nutrition 0.000 description 1
- 125000003373 pyrazinyl group Chemical group 0.000 description 1
- 125000000168 pyrrolyl group Chemical group 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 238000001275 scanning Auger electron spectroscopy Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- MABNMNVCOAICNO-UHFFFAOYSA-N selenophene Chemical compound C=1C=C[se]C=1 MABNMNVCOAICNO-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 125000005504 styryl group Chemical group 0.000 description 1
- 125000000547 substituted alkyl group Chemical group 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- CBDKQYKMCICBOF-UHFFFAOYSA-N thiazoline Chemical compound C1CN=CS1 CBDKQYKMCICBOF-UHFFFAOYSA-N 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 125000005309 thioalkoxy group Chemical group 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- RPVGLMKJGQMQSN-UHFFFAOYSA-N tiliquinol Chemical compound C1=CC=C2C(C)=CC=C(O)C2=N1 RPVGLMKJGQMQSN-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
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- 229940078162 triadine Drugs 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- 125000001425 triazolyl group Chemical group 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- XRXDCKUSXVGNCW-UHFFFAOYSA-K tris[(2-methylquinolin-8-yl)oxy]alumane Chemical compound C1=C(C)N=C2C(O[Al](OC=3C4=NC(C)=CC=C4C=CC=3)OC3=CC=CC4=CC=C(N=C43)C)=CC=CC2=C1 XRXDCKUSXVGNCW-UHFFFAOYSA-K 0.000 description 1
- 229940100050 virazole Drugs 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
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- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
Definitions
- the present invention relates to an organic electroluminescent device, and more particularly to an organic electroluminescent device using phosphorescent light emission, having a low driving voltage and high luminous efficiency.
- Akita
- electroluminescence In an organic electroluminescence device (hereinafter, electroluminescence may be abbreviated as EL), a fluorescent substance is generated by applying an electric field to recombination energy of holes injected from an anode and electrons injected from a cathode. It is a self-luminous element using the principle of emitting light.
- EL organic electroluminescence
- Eastman's Kodak CW Tang et al. Report on low-voltage driven organic EL devices using stacked devices (CW Tang, SA Vansly ke, Applied Physics Letters, Vol. 51, pp. 913, Since 1987, research on organic EL devices using organic materials as constituent materials has been actively conducted. Tang et al.
- the element structure of the organic EL element includes a hole transport (injection) layer, a two-layer electron transport / emission layer, or a hole transport (injection) layer, a light emitting layer, and an electron transport (injection) layer.
- the three-layer type is well known.
- Light emitting materials such as tris (8-quinolinolato) aluminum complex, coumarin derivatives, tetraphenylbutadiene derivatives, bis-styryl arylene derivatives, and oxaziazol derivatives are known as light-emitting materials for organic EL devices. It has been reported that they can emit light in the visible region from blue to red, and it is hoped that a color display device will be realized (for example, see Japanese Patent Application Laid-Open No. 8-239655). Gazette, JP-A-7-138561, etc.).
- the light emitting layer of the organic EL device high luminous efficiency is achieved by utilizing the singlet state and the triplet state of the excited state of the organic phosphorescent material.
- electrons and holes recombine in the organic EL device, it is considered that singlet excitons and triplet excitons are generated in a 1: 3 ratio due to the difference in spin multiplicity.
- the use of such a luminescent material is expected to achieve luminous efficiency 3 to 4 times that of a device using only fluorescence.
- the anode, the hole transport layer, the organic light emitting layer, the electron transport layer (hole blocking layer), the triplet excited state or the triplet exciton are not sequentially quenched.
- a configuration in which layers are stacked such as an electron injection layer and a cathode has been used for example, US Patent No. 6,097,147, International Patent Publication W001 / 4152. Refer to the specification).
- the organic EL device having this configuration had the following features.
- the hole blocking layer can limit the movement of holes from the organic light emitting layer, and improve the probability of recombination with electrons by efficiently accumulating holes in the light emitting layer.
- the electron injection layer and the light emitting layer are directly bonded to each other so that the triplet energy of the electron transport material forming the electron injection layer is larger than the triplet energy of the host material forming the light emitting layer.
- a known device is also known (for example, Japanese Patent Application Laid-Open No. 2002-100476).
- the triplet energy of the electron transporting material is increased, the singlet energy that can avoid quenching is generally larger than the triplet energy by 0.3 eV or more. As a result, the energy gap of the electron transporting material is increased. Extremely large, 3 eV or more.
- the energy barrier for electron injection from the cathode is extremely large, and the driving voltage is increased. If the energy barrier is large, deterioration is apt to occur when current is continuously injected, and the life of the element is shortened. There was a problem such as being short.
- a host material of a light emitting layer is formed of an electron transport material.
- the host material used in this device had an ionization potential of 5.9 eV or more. As a result, holes cannot be injected into the host material, and the host material does not transport holes, resulting in a high driving voltage. Disclosure of the invention
- the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide an organic EL device using phosphorescent light emission, which has a low driving voltage and high luminous efficiency.
- the present inventors have conducted intensive studies to achieve the above object, and as a result, in the first invention, at least a light emitting layer and a light emitting layer formed of a host material and a light emitting layer are bonded to each other between the cathode and the cathode.
- a hole blocking layer is omitted, and the energy gap of the electron transport material in the electron injection layer is reduced by the energy of the host material in the light emitting layer.
- the excited state generated in the light emitting layer is deactivated by the electron injection layer, and only a device with extremely low efficiency can be obtained.
- the region where electrons and holes recombine is separated from the interface between the electron-injecting layer and the light-emitting layer, and deactivation is avoided.
- a hole blocking layer is used as in the conventional organic EL device.
- a high-efficiency device, and furthermore, holes can be injected and transported into the host material in the light-emitting layer, so that the driving voltage can be reduced. Can be obtained.
- the configuration of the organic EL device was simplified, it could be easily manufactured.
- the inclusion of an electron transport material whose energy gap is smaller than the energy gap of the host material in the light-emitting layer has the effect of promoting electron injection from the cathode and has the effect of lowering the voltage. was done.
- an electron injection layer bonded to the light emitting layer is provided at least between the light emitting layer composed of the phosphorescent light emitting material and the host material and the cathode, and the electron in the electron injection layer is provided.
- the triplet energy of the transport material was made smaller than that of the host material in the light emitting layer. This makes it possible to narrow the energy gap of the electron transport material and improve the electron injection from the cathode. According to the conventional understanding of those skilled in the art, by doing so, the excited state generated in the light emitting layer is deactivated by the electron injection layer, and only a device with extremely low efficiency can be obtained.
- the region where electrons and holes recombine is separated from the interface between the electron-injecting layer and the light-emitting layer, thereby preventing deactivation.
- the potential of the host material to 5.9 eV or less so that holes can be well injected into the host material in the light emitting layer, unlike the conventional organic EL device, It became possible to obtain a highly efficient device without using an electron injection layer with a wide energy gap, and the life of the device was improved as a result of reducing the energy barrier of electron injection.
- the driving voltage can be reduced.
- the structure of the organic EL device has been simplified, so that it can be easily manufactured.
- the first aspect of the present invention relates to an organic EL device having at least a light emitting layer composed of a phosphorescent light emitting material and a host material between a cathode and an anode, wherein an electron bonded to the light emitting layer is provided between the light emitting layer and the cathode.
- An injection layer, the light-emitting layer has an electron-transporting property, the ionization potential of the host material is 5.9 eV or less, and the energy gap of the electron-transport material in the electron-injection layer is a host material in the light-emitting layer.
- the present invention provides an organic EL device characterized by having a small energy gap.
- the present invention provides an organic EL device having at least a light-emitting layer composed of a phosphorescent light-emitting material and a host material between a cathode and an anode, wherein an electron bonded to the light-emitting layer is provided between the light-emitting layer and the cathode.
- An emission layer having an electron-transporting property, an ionization potential of the host material being 5.9 eV or less, and a triplet energy of the electron-transporting material in the electron injection layer being An organic EL device characterized by having a smaller triplet energy of the host material.
- the layer has an electron transporting property.
- the electron transporting property means that the layer is one of the following (1) or (2).
- (1) electron mobility of the host material in the light-emitting layer is 1 0- 6 cm 2 / Vs or more (preferably, 1 0- 5 cm 2 / Vs or more) compound is.
- the electron mobility can be measured by the time-of-flight method (TOF) or transient measurement of space charge limited current.
- TOF time-of-flight method
- the TOF method is described in Synthetic Metals (Synth. Met.) 111/112, (2000) p. 331, and the transient measurement of space charge limited current is described in Electrical 'Transports in Solids, Pergamon Press, Pp. 346-348.
- the efficiency of the device AN 'in which the phosphorescent compound is added only to the anode side interface of the light emitting layer and the device CA' in which the phosphorescent compound is added only to the cathode side interface are high, the efficiency of the device AN 'is large. Furthermore, it can be said that the light emitting layer has an electron transporting property.
- the electron transporting property in the present invention does not mean that there is no hole transporting property. It is then wanted to electron transport property, but when the measured hole mobility, no problem optionally bear a value greater than 1 0- 7 cm 2 / V s .
- the reducing dopant is added to the electron injecting layer or added to the interface region between the cathode and the layer bonded to the cathode. By doing so, the voltage of the element can be reduced.
- a hole transport layer to which a phosphorescent light emitting material is added is provided between the cathode and the anode. In this way, the production in the hole transport layer The excited state also leads to light emission, which further increases the light emission efficiency.
- the triplet energy of the hole transport material in the hole transport layer is larger than the excitation energy of the phosphorescent light emitting material in the light emitting layer.
- the organic EL device is an organic EL device having at least a light emitting layer comprising a phosphorescent light emitting material and a host material between a cathode and an anode, wherein the light emitting layer is joined between the light emitting layer and the cathode.
- An electron-injecting layer, the light-emitting layer has an electron-transporting property, and the host material has an ionization potential of 5.9 eV or less (preferably 5.8 eV or less);
- the energy gap of the transport material is much smaller than the energy gap of the host material in the light emitting layer.
- the organic EL device of the second invention is an organic EL device having at least a light emitting layer composed of a phosphorescent light emitting material and a host material between a cathode and an anode, wherein the light emitting layer is bonded to the light emitting layer between the light emitting layer and the cathode.
- the host material has an ionization potential of 5.9 eV or less (preferably 5.8 eV or less).
- the triplet energy of the electron transport material is smaller than the triplet energy of the host material in the light emitting layer.
- a phosphodiester Bok material of the light-emitting layer has an electron-transporting property
- electron transporting of the host material is preferably a 1 0- 6 cm 2 / V s or more.
- the host material in the light-emitting layer conventionally used polycarbazole compounds such as polybulbazole and bis-lvubazole have a hole-transporting property and a small electron-transporting ability except in exceptional cases. .
- a hole transporting material is used as a host material
- the cathode-side interface of the light emitting layer becomes a main recombination region.
- an electron injection layer is interposed between the light emitting layer and the cathode.
- the electron-injecting layer contains an electron transporting material that has a small energy gap that forms the light-emitting layer, the excited state generated around the cathode-side interface of the light-emitting layer is reduced by the electron-injecting layer.
- the region where electrons and holes recombine is separated from the interface between the electron-injection layer and the light-emitting layer, thereby avoiding the deactivation of the excited state.
- the host material in the light emitting layer of the present invention has an ionization potential of 5.9 eV or less. By doing so, since the ionization potential of the hole transport material is 5.3 to 5.7 eV, the energy barrier can be set to 0.2 to 0.6 eV, and Holes can be injected into the material. Further, since holes are transported between the host materials, a compound having a low driving voltage can be used.
- the host material in the light-emitting layer is preferably a compound in which a carbazolyl group or an azacarbazolyl group is linked to a nitrogen-containing ring, or a compound in which a carbazolyl group or an azacarbazolyl group is linked to a nitrogen-containing ring through an arylene group.
- Each of the carnozolyl group, the azaphenol group, the nitrogen-containing ring and the arylene group may have a substituent. Examples of the substituent include a hydrogen atom, a halogen atom, and a hydroxyl group.
- the host material in the light emitting layer is more preferably a compound represented by the following general formula (1) or (2). (C z-) m A (1)
- C z is a substituted or unsubstituted carbazolyl group or a substituted or unsubstituted azacarbazolyl group.
- A is an aryl-substituted nitrogen-containing ring group, a diaryl-substituted nitrogen-containing ring group, or a triaryl-substituted ring group.
- M is an integer of 1 to 3.
- C z is a substituted or unsubstituted carbazolyl group or a substituted or unsubstituted azacarbazolyl group.
- A is an aryl-substituted nitrogen-containing ring group, a diaryl-substituted nitrogen-containing ring group, or a triaryl-substituted ring group.
- a nitrogen ring group, and n is an integer of 1 to 3.
- Preferable nitrogen-containing rings in the host material include pyridine, quinoline, pyrazine, pyrimidine, quinoxaline, triazine, imidazole, imidazopyridine, pyridazine, benzimidazole and the like.
- an organometallic complex is preferable because the external quantum efficiency of the device can be further improved.
- organometallic complexes are preferably organometallic complexes represented by the following general formula (3).
- a l represents a substituted or unsubstituted aromatic hydrocarbon ring group or an aromatic heterocyclic group, preferably a phenyl group, Bifue group, a naphthyl group, an anthryl group, thienyl group, a pyridyl group A quinolyl group or an isoquinolyl group;
- substituents include a halogen atom such as a fluorine atom; an alkyl group having 1 to 30 carbon atoms such as a methyl group and an ethyl group; an alkenyl group such as a butyl group;
- An alkoxycarbonyl group having 1 to 30 carbon atoms such as a ethoxycarbonyl group; an alkoxy group having 1 to 30 carbon atoms such as a methoxy group or an ethoxy group; an aryloxy group such as a phenoxy group or a benzyloxy group; a dimethylamino group; Dia
- a 2 represents a substituted or unsubstituted aromatic heterocyclic group containing nitrogen as an atom forming a heterocyclic ring, and is preferably a pyridyl group, a pyrimidyl group, a pyrazine group, a triazine group, a benzothiazol group, Benzookisazo Ichiru group, benzimidazole group, quinolyl group, isoquinolyl group, quinoxaline group, a Fuwenantorijin group, examples of the substituent are the same as those for a 1.
- It may be ring containing ring A 2 which comprises the A 1 to form a single fused ring, as such may, for example, 7, 8-benzoquinoline group.
- Q is a metal selected from groups 7 to 11 of the periodic table, and preferably represents ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum, and gold.
- L represents a bidentate type ligand, and is preferably selected from S-diket type ligands such as acetyl acetonate or pyromellitic acid.
- Specific examples of the organometallic complex represented by the general formula (3) are shown below, but are not limited to the following compounds. (Kl) (K-2)
- the electron transporting material used in the electron injecting layer of the present invention has an energy gap of the electron transporting material smaller than that of the host material in the light emitting layer, or has a triplet energy of the electron transporting material in the light emitting layer. By making it smaller than the host material, electron injectability is improved.
- the energy gap of the electron transporting material in the electron injection layer is preferably 2.8 eV or less, more preferably 2.75 eV or less.
- Preferred electron transport materials include nitrogen-containing heterocyclic compounds. This is defined as a compound having a heterocyclic ring having a nitrogen atom. Examples thereof include a nitrogen-containing complex and a nitrogen-containing ring compound. Examples of the nitrogen-containing complex include compounds represented by any of the following (4) to (6). Is preferred.
- Q and Q ′ are each independently a ligand represented by the following general formulas (7) and (8a) to (8c).
- a r 7 ⁇ A r 1 Q each independently represent a substituted or unsubstituted aromatic hydrocarbon group or aromatic heterocyclic Represents a ring group
- Q and Q ′ may each be a benzoazole, and examples thereof include benzoimidazole, benzothiazole, and benzoxazole derivatives. Of these, particularly preferred Q and Q ′ are It is represented by the general formula (9).
- R 2 to R 7 each independently represent a hydrogen atom, a halogen atom, a hydroxy group, a substituted or unsubstituted amino group, a nitro group, a cyano group, a substituted or unsubstituted alkyl group, Substituted or unsubstituted alkenyl group, substituted or unsubstituted cycloalkyl group, substituted or unsubstituted alkoxy group, substituted or unsubstituted aromatic hydrocarbon group, substituted or unsubstituted aromatic heterocyclic group, substituted or unsubstituted Represents an unsubstituted aralkyl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkoxycarbonyl group, or a carboxyl group, and R 2 to R 7 form a ring with two of them. Is also good.) Specific examples of the groups represented by R 2 to
- halogen atom examples include fluorine, chlorine, bromine, and iodine.
- a substituted or unsubstituted amino group is represented by — NX 1 X 2, and examples of X 1 and X 2 are each independently a hydrogen atom, a methyl group, an ethyl group, a propyl group, an isopropyl group, n-butyl group, s-butyl group, isobutyl group, t_butyl group, n-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, hydroxymethyl group, 1-hydroxyethyl group Group, 2-hydroxyethyl group, 2-hydroxyisobutyl group, 1,2-dihydroxyethyl group, 1,3-dihydroxyisopropyl group, 2,3-dihydroxy-t-butyl group, 1,2,3- Trihydroxypropyl, chloromethyl, 1-chloroethyl, 2-chloroethyl, 2-chloroisobutyl, 1,2-dich
- 2-t-butylpyrroyl-4-yl group 3- (2-phenylpropyl) pyrrole-11-yl group, 2-methyl-11-indolyl group, 4-methyl-11-indolyl group, 2-methyl-1-indolyl 4-methyl-1-3-indolyl, 2-t-butyl 1-indolyl, 4-t-butyl 1-indolyl, 2-t-butyl 3-indolyl, 4-t-butyl 3-indolyl And the like.
- substituted or unsubstituted alkyl groups include methyl, ethyl, propyl, isopropyl, n-butyl, s-butyl, isobutyl, t-butyl, n-pentyl, n- Hexyl group, n-heptyl group, n-octyl group, hydroxymethyl group, 1-hydroxyethyl group, 2-hydroxyethyl group, 2-hydroxy Droxyisobutyl group, 1,2-dihydroxyethyl group, 1,3-dihydroxyisopropyl group, 2,3-dihydroxy-t-butyl group, 1,2,3-trihydroxypropyl group, chloromethyl group, Cloethyl group, 2-chloroethyl group, 2-chloroisobutyl group, 1,2-dichloroethyl group, 1,3-dichloroisopropyl group, 2,3-dichloro-1-t-butyl group, 1,
- Examples of the substituted or unsubstituted alkenyl group include a butyl group, an aryl group, a 1-butenyl group, a 2-butenyl group, a 3-butenyl group, a 1,3-butanenyl group, a 1-methylvinyl group, a styryl group, a 2,2 —Divinyl vinyl group, 1,2-diphenyl vinyl group, 1-methylaryl group, 1,1-dimethylaryl group, 2-methylaryl group, 1-phenylaryl group, 2-phenylaryl group, 3-phenylaryl group, 3,3— Diphenylaryl group, 1,2-dimethylaryl group, 1-phenyl 1 And a butenyl group and a 3-phenyl-1-butenyl group.
- Examples of the substituted or unsubstituted cycloalkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a 4-methylcyclohexyl group, and the like.
- a substituted or unsubstituted alkoxy group is a group represented by OY, and examples of Y include methyl, ethyl, propyl, isopropyl, n-butyl, s-butyl, and isobutyl.
- Examples of the substituted or unsubstituted aromatic hydrocarbon group include phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl, 1-phenylanthryl , 2-Phananthryl, 3-Phananthryl, 4-Phenanthryl, 9-Phananthryl, 1-Naphthacenyl, 2-Naphthenyl, 9-Naphthacenyl, 1-Pyrenyl, 2-Pyrenyl, 4-Pyrenyl Pyrenyl, 2-biphenyl, 3-biphenyl, 4-biphenyl, p-phenyl-1-yl, p-phenyl-3-yl, p-turf Phenyl-2-yl group, m-phenyl-1-yl group, m-terphenyl-3-yl group, m-phenyl-2-yl group, 0-tolyl group,
- Examples of the substituted or unsubstituted aromatic heterocyclic group include: 1 monopyrrolyl group, 2-pyrrolyl group, 3-pyrrolyl group, virazinyl group, 2-pyridinyl group, 3-pyridinyl group, 4-pyridinyl group, —Indolyl, 2 _indolyl, 3—indolyl, 4—indolyl, 5—indolyl, 6—indolyl, 1—isoindolyl, 2—isoindolyl, 3—isoindolyl, 4 Monoisoindolyl, 5-isoindolyl, 6-isoindolyl, 7-isoindolyl, 2-furyl, 3-furyl, 2-benzofuranyl, 3-benzofuranyl, 4-benzofuranyl, 5- Benzofuranyl, 6-benzofuranyl, 7-benzofuranyl, 1-isobenzofuranyl, 3
- substituted or unsubstituted aralkyl groups include benzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, 2-phenylisopropyl, phenylt-butyl, ⁇ -naphthyl Methyl group, 1- ⁇ -naphthylethyl group, 2_ ⁇ -naphthylethyl group, 1- ⁇ -naphthylisopropyl group, 2-1-naphthylisopropyl group, —naphthylmethyl group, 11-naphthylethyl group, 2-S— Naphthylethyl, 1-naphthylisopropyl, 2-) 3-naphthylisopropyl, 1-pyrrolylmethyl, 2- (1-pyrrolyl) ethyl, p-methylbenzyl, m-methylbenzyl,
- a substituted or unsubstituted aryloxy group is represented by 1 OZ, and examples of Z are phenyl, 1 naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl Group, 1-phananthryl group, 2-fananthryl group, 3-fananthryl group, 4-fananthryl group, 9-fananthryl group, 1-naphthacenyl group, 2-naphthacenyl group, 9-naphthacenyl group, 1-pyrenyl group, 2-pyrenyl group, 4 -Pyrenyl group, 2-biphenylyl group, 3-biphenylyl group, 4-biphenylyl group, p-butylphenyl-14-yl group, p-terphenyl-3-yl group, p_terphenyl-2-yl M-terphenyl-4-yl group, m-taphenyl-3-yl group,
- a substituted or unsubstituted alkoxycarbonyl group is represented as COOY, and examples of Y include methyl, ethyl, propyl, isopropyl, n-butyl, s-butyl, isobutyl, and t-butyl.
- n-pentyl group n-hexyl group, n-heptyl group, n-octyl group, hydroxymethyl group, 1-hydroxyethyl group, 2-hydroxyethyl group, 2-hydroxyisobutyl group, 1, 2-dihydroxyxyl, 3-dihydroxyisopropyl, 2,3-dihydroxy-t-butyl, 1,2,3-trihydroxypropyl, chloromethyl, 1-chloroethyl, 2-chloro Ethyl, 2-chloroisobutyl, 1,2-dichloroethyl, 1,3-dichloroisopropyl, 2,3-dichlorobutyryl, 1,2,3-trichloropropyl, butyl Lomomethyl group, 1-bromoethyl group, 2-bromoethyl group, 2-bromoisobutyl group, 1,2-dibromoethyl group, 1,3-dibromoisopropyl group, but
- Examples of the divalent group for forming a ring include a tetramethylene group, a pentamethylene group, a hexamethylene group, a diphenylmethane-12,2′-diyl group, a diphenylethane-1,3,3,1-diyl group, and a diphenyl group.
- An enylpropane-1,4,1-diyl group and the like can be mentioned.
- substituents include a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a nitro group, a cyano group, an alkyl group, an alkenyl group, a cycloalkyl group, an alkoxy group, an aromatic hydrocarbon group, and an aromatic heterocyclic ring.
- substituents include a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a nitro group, a cyano group, an alkyl group, an alkenyl group, a cycloalkyl group, an alkoxy group, an aromatic hydrocarbon group, and an aromatic heterocyclic ring.
- a particularly preferred nitrogen-containing complex of the electron transporting material is a metal complex in which a single type of nitrogen-containing ring derivative is coordinated, wherein the nitrogen-containing ring is quinoline, fuirubiridine, benzoquinoline or Preference is given to pennant phosphorus. Further, it is preferable that the metal complex is a metal complex of quinolinol or a derivative thereof.
- a metal complex having an 8-quinolinol derivative as a ligand for example, a tris (8-quinolinol) A1 complex, a tris (5,7-dichrolic-8-quinolinol) A1 complex Body, Tris (5,7—Jib mouth 8—Quinolinol) A 1 complex, Tris (2-methyl-8-quinolinol) A 1 complex, Tris (5-methyl-8-quinolinol) A 1 Complex, Tris (8-quinolinol) Zn complex, Tris (8-quinolinol) In complex, Tris (8-quinolinol) Mg complex, Tris (8-quinolinol) .Cu complex, Tris (8 —Quinolinol) Ca complex, Tris (8-quinolinol) Sn complex, Tris (8-quinolinol) Ga complex, Tris (8-quinolinol) le) Pb complex, etc. The above combinations are given.
- the nitrogen-containing ring compound of the electron transporting material include compounds having, as a nitrogen-containing ring, pyridine, quinolyl>, virazine, pyrimidine, quinoxaline, triazine, imidazole, imidazopyridine, and the like.
- a compound in which a nitrogen-containing ring and a condensed aromatic ring are connected or a compound in which a nitrogen-containing ring is connected to a condensed aromatic ring via an arylene group is preferable because the energy gap can be reduced.
- the nitrogen-containing ring, the condensed aromatic ring and the arylene group each may have a substituent.
- substituents include a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a nitro group, a cyano group.
- Preferred examples of the condensed aromatic ring include naphthalene, anthracene, pyrene, phenanthrene, fluoranthene, chrysene, perylene, naphthocene, and benzene.
- the nitrogen-containing ring is a condensed ring of a 6-membered ring and a 5-membered ring of an imidazole or a condensed imidazopyridine or benzoimidazole. And having 1 to 4 nitrogen atoms, for example, having a benzimidazole structure, for example, having the following general formulas (A) to (B) Are represented.
- L represents a monovalent or divalent linking group, for example, carbon, gayne, nitrogen, boron, oxygen, sulfur, metal (eg, barium, beryllium), aromatic Aromatic hydrocarbon rings, aromatic heterocyclic rings, etc., of which carbon atoms, nitrogen atoms, gayne atoms, boron atoms, oxygen atoms, sulfur atoms, aromatic hydrocarbon groups, and aromatic hetero groups are preferable.
- An atom, a gay atom, an aromatic hydrocarbon group and an aromatic hetero group are more preferred.
- the aromatic hydrocarbon group and the aromatic hetero group represented by L may have a substituent, and the substituent is preferably an alkyl group, an alkenyl group, an alkynyl group, an aromatic hydrocarbon group, an amino group, an alkoxy group, or an aryloxy group.
- acyl group alkoxycarboxy group, aryloxycarbonyl group, acyloxy group, acylylamino group, alkoxycarbonylamino group, aryloxycarbonylamino group, sulfonylamino group, sulfamoyl group, and sulfamoyl group
- alkylthio group, arylthio group, sulfonyl group, halogen atom, cyano group, and aromatic heterocyclic group more preferably alkyl group, aryl group, alkoxy group, aryloxy group, halogen atom, cyano group, An aromatic heterocyclic group, more preferably an alkyl group, aryl , An alkoxy group, Ariruokishi group, an aromatic heterocyclic group, particularly preferably Al kill group, Ariru group, an alkoxy group, an aromatic heterocyclic group.
- L when L is a negative value, L is represented by one L′-A r 1 -A r 2 , and L ′, A r 1 , and A r 2 are: Anne that is a fused aromatic ring Toracene, naphthylene, chrysene, phenanthrene, fluoranthene, pyrene, perylene, aromatic heterocyclic pyridine, pyrimidine, triazine, and non-fused aromatic rings such as benzene, biphenyl, and terphenyl. Are preferred. These residues may be substituted and L, may represent a single bond.
- a r 1 is particularly preferably an anthracene residue, a naphthalene residue or a chrysene residue
- a r 2 is particularly preferably a naphthalene residue, a biphenyl residue or a benzene residue.
- the general formulas (A) and (B) are preferably represented by HA r-L, -A r 1 -di-HA r.
- L, and examples of A r 1 is ⁇ Pi preferred examples are the same as defined above, may have a substituent, L 'may be a single bond.
- the aliphatic hydrocarbon group for R and R ′ is a linear, branched or cyclic alkyl group (preferably having 1 to 20 carbon atoms, more preferably having 1 to 12 carbon atoms, and particularly preferably having 1 to 12 carbon atoms).
- alkyl, methyl, ethyl, is 0-propyl, tert-butyl, n-butyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl, etc.
- An alkenyl group preferably an alkenyl group having 2 to 20 carbon atoms, more preferably an alkenyl group having 2 to 12 carbon atoms, and particularly preferably 1 to 8 carbon atoms, for example, butyl, aryl, 2-butenyl, and 3-pentenyl; And the like.
- An alkynyl group preferably an alkynyl group having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, for example, propargyl, 3 —Penchu And the like, and is preferably an alkyl group.
- the aromatic hydrocarbon group for R and R ′ is a single ring or a condensed ring, preferably has 6 to 30 carbon atoms, more preferably has 6 to 20 carbon atoms, and still more preferably has 6 to 12 carbon atoms.
- a group hydrocarbon group for example, phenyl, 2-methylphenyl, 3-methylphenyl, 4-methylphenyl, 2-methoxyphenyl, 3-trifluoromethylphenyl, pentafluorophenyl, naphthyl, naphthyl, etc. Are mentioned.
- the heterocyclic group of R and R ′ is a monocyclic or condensed ring, preferably a heterocyclic group having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, and still more preferably 2 to 10 carbon atoms. And is preferably an aromatic heterocyclic group containing at least one of a nitrogen atom, an oxygen atom, a sulfur atom and a selenium atom.
- heterocyclic group examples include, for example, Gin, piperidine, piperazine, morpholine, thiophene, selenophene, franc, pyrrole, imidazole, virazole, pyridine, virazine, pyridazine, pyrimidine, triazole, triadine, indole, indazole, pudding, Thiazoline, thiazole, thiadiazole, oxazoline, oxazole, oxazine diazole, quinoline, isoquinoline, phthalazine, naphthyridine, quinoxaline, quinazoline, cinnoline, pteridine, acridine, pennant mouth, benzozine, benzozole, benzozole, benzozole, benzozole, benzozole Examples include zothiazole, benzotriazole, tetrazaindene, carbazolyl, and aze
- the aliphatic hydrocarbon group, aromatic hydrocarbon group and heterocyclic group represented by R and R ′ may have a substituent, and the substituent may be a substituent of the group represented by L. It is the same as the above, and the preferred substituent is also the same.
- R and R ′ are preferably an aliphatic hydrocarbon group, an aromatic hydrocarbon group or a heterocyclic group, more preferably an aliphatic hydrocarbon group (preferably having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, more preferably 6 to 12 carbon atoms) or an aromatic hydrocarbon group, more preferably an aliphatic hydrocarbon group (preferably 1 to 20 carbon atoms, more preferably It has 1 to 12 carbon atoms, more preferably 2 to 10 carbon atoms.
- n is an integer of 1-2.
- Examples of the nitrogen-containing ring compound having an imidazopyridine structure in the electron transporting material include those represented by the following general formula (C).
- Ar 1 is a substituted or unsubstituted aryl group having 6 to 60 (preferably 6 to 40) carbon atoms, or a substituted or unsubstituted 3 carbon atoms. To 60 (preferably 3 to 40 nuclear carbon atoms) heteroaryl group.
- Examples of the substituted or unsubstituted aryl group of A r include a fujyl group, a 1-naphthyl group, a 2-naphthyl group, a 1-anthryl group, a 2-anthryl group, a 9-anthryl group, and a 1-phenylanthryl group , 2-fananthryl group, 3-fananthryl group, 4-fananthryl group, 9-fananthryl group, 1-naphthacenyl group, 2-naphthacenyl group, 9-naphthacenyl group, 1-chrysenyl group, 2-chrysenyl group, 6-chrysenyl group, 1-pyrenyl group, 2-pyrenyl group, 4-pyrenyl group, 2-biphenylyl group, 3-biphenylyl group, 4-biphenylyl group, p-terphenyl-1-yl group, p-1-phenyl 3-yl
- Examples of the substituted or unsubstituted heteroaryl group for Ar include a pyrrolyl group, a furyl group, a phenyl group, a silylyl group, a pyridyl group, a quinolyl group, an isoquinolyl group, a benzofuryl group, an imidazolyl group, a pyrimidyl group, Examples include a rubazolyl group, a selenophenyl group, an oxaziazolyl group, and a triazolyl group, and a pyridyl group, a quinolyl group, and an isoquinolyl group are preferable.
- Ar 2 ′ is a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 60 (preferably 6 to 40) nuclear carbon atoms, a substituted or unsubstituted nuclear carbon atom, A heteroaryl group having 3 to 60 (preferably 3 to 40 core carbon atoms), a substituted or unsubstituted alkyl group having 1 to 20 (preferably 1 to 6 carbon atoms), or a substituted or unsubstituted alkyl group; It is an unsubstituted alkoxy group having 1 to 20 (preferably 1 to 6) carbon atoms.
- Examples of the substituted or unsubstituted aryl group of Ar 2 ′ include the same groups as those of the above Ar.
- Examples of the substituted or unsubstituted heteroaryl group for Ar 2 ′ include the same as those for the above Ar.
- the substituted or unsubstituted alkoxy group of Ar 2 ′ is a group represented by OY, and examples of Y include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, and an s-butyl group.
- one of Ar and Ar 2 ′ is a substituted or unsubstituted fused ring group having 10 to 60 nuclear carbon atoms, or a substituted or unsubstituted nuclear carbon. It is a monohetero fused ring group having a prime number of 3 to 60.
- L 1 and L 2 each independently represent a single bond, a substituted or unsubstituted arylene group having 6 to 60 (preferably 6 to 40) carbon atoms, Or a substituted or unsubstituted fluorenylene group having 3 to 60 (preferably 3 to 40) nuclear carbon atoms, or a substituted or unsubstituted fluorenylene group.
- Examples of the substituted or unsubstituted arylene group for L 1 and L 2 include the aforementioned Ar 1 ′ And the same aryl group as above except that the hydrogen atom is further removed to form a divalent group
- Examples of the substituted or unsubstituted of the Teroari one alkylene group of L 1 and L 2 can be mentioned those divalent groups, except for an additional hydrogen atom from the heteroaryl group wherein Ar similar to to.
- L 1 and / or L 2 are
- a r is the following general formula (a)
- R 1 to R 92 each independently represent a hydrogen atom, a halogen atom, a substituted or unsubstituted carbon number, Up to 20 alkyl groups, substituted or unsubstituted carbon number Up to 20 alkoxy groups, substituted or unsubstituted nuclear carbon atoms up to 40 aryl groups, substituted or unsubstituted aryl carbon groups having 12 to 80 carbon atoms, substituted or unsubstituted 40 carbon atoms Aryl group, substituted or unsubstituted nuclear carbon A heteroaryl group having the number of 3 to 40, or a substituted or unsubstituted diarylaminoaryl group having a nuclear carbon number of 1.8 to 120, L 3 is a single bond and
- R '' in the general formula (C) represents a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 60 nuclear carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 60 nuclear carbon atoms, substituted or unsubstituted It is a substituted alkyl group having 1 to 20 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms.
- R ′′ ′ examples include the same as those described above for Ar.
- Examples of the substituted or unsubstituted heteroaryl group for R ′′ include the same as those described above for Ar.
- Examples of the substituted or unsubstituted alkyl group for R ′ ′′ include the same as the above-mentioned Ar 2 ′.
- Examples of the substituted or unsubstituted alkoxy group include the same as those described above for Ar 2 ′.
- the nitrogen-containing ring compound represented by the general formula (C) may have a substituent, and the substituent is preferably an alkyl group, an alkenyl group, an alkynyl group, an aromatic hydrocarbon group, an amino group, an alkoxy group.
- nitrogen-containing ring compounds Since these nitrogen-containing ring compounds have a small energy gap, they are excellent in the ability to inject electrons from the cathode, have high durability against electron transport, and can provide a long-life device.
- the reducing dopant is added to the electron injection layer or is added to the interface region between the cathode and the layer joined to the cathode, and the work function of the reducing dopant is It is preferably 2.9 eV or less. It is defined as a compound that increases the electron injection efficiency.
- the reducing dopant reduces at least a part of the contained electron injection layer or the interface region to anionization.
- a mode of adding the reducing dopant to the interface region it is preferable to form a layer or an island.
- the reducing dopant is selected from alkali metals, alkali metal complexes, alkali metal compounds, alkaline earth metals, alkaline earth metal complexes, alkaline earth metal compounds, rare earth metals, rare earth metal complexes, and rare earth metal compounds. It is preferable to use at least one kind.
- Examples of the alkali metal compound, alkaline earth metal compound, and rare earth metal compound include respective oxides and halides.
- the alkali metals include Na (work function: 2.36 eV), K (work function: 2.28 eV), Rb (work function: 2.16 eV), and Cs (work function: 1. 95 eV), and those having a work function of 2.9 eV or less are particularly preferable. Of these, K :, Rb, Cs, more preferably Rb or Cs, and most preferably Cs.
- alkaline earth metal examples include Ca (work function: 0.9 eV), Sr (work function: 2.0 to 2.5 eV), Ba (work function: 2.52 eV), and the like. It is particularly preferable that the work function is 2.9 eV or less.
- rare earth metal examples include Sc, Y, Ce, Tb, and Yb, and those having a work function of 2.9 eV or less are particularly preferable.
- preferred metals have a particularly high reducing ability, and the addition of a relatively small amount to the electron injection region can improve the emission luminance and extend the life of the organic EL device.
- alkali metal compound examples include alkali oxides such as Li 20 , Cs 20 and K 20 , and alkali halides such as Li F, NaF, Cs F and KF.
- L as the i 2 0,
- Al force Li oxide N aF or aralkyl force Rifu' product is preferable that the alkaline earth metal compound, B aO, S r O, C a 0 and B a x S r mixing these ! -x and 0 (0 rather x rather 1), B a x C a .- x ⁇ (0 ⁇ x ⁇ 1), and the like, B aO, S r O, is C a 0 preferred.
- the alkali metal complex, the alkaline earth metal complex, and the rare earth metal complex may be, for example, an alkali metal ion, an alkaline earth metal ion, and a rare earth metal ion, respectively. There is no particular limitation as long as it contains at least one metal ion.
- the ligands include quinolinol, benzoquinolinol, acridinol, phenanthrinol, hydroxyphenyloxazole, hydroxyphenylthiazol, hydroxydiaryloxazine diazol, hydroxydiarylthiaziazole, and hydrinazole. Droxyphenylpyridine, Hydroxyphenylbenzoimidazole, Hydroxybenzotriazole, Hydroxyfluborane, Bipyridyl, Phosphorus
- Preferred are, but not limited to, phthalocyanine, porphyrin, cyclopentadiene, S-diketones, azomethines, and derivatives thereof.
- a luminescent material forming an interface region and an organic material which is an electron injection material are simultaneously deposited while depositing a reducing dopant by a resistive heating deposition method, and a reducing dopant is dispersed in the organic material.
- the method is preferred.
- the reducing dopant is formed in a layered form, after forming the luminescent material and the electron injecting material, which are the organic layers at the interface, in a layered form, the reducing dopant is independently deposited by a resistance heating evaporation method, and preferably the layer is formed. It is formed with a thickness of 0.1 to 15 nm.
- the reducing dopant When the reducing dopant is formed in an island shape, the light emitting material and the electron injecting material, which are organic layers at the interface, are formed in an island shape, and then the reducing dopant is independently deposited by a resistance heating evaporation method.
- the island is formed with a thickness of 0.05 to 1 nm.
- a hole transport layer to which a phosphorescent light emitting material is added is provided between the cathode and the anode.
- the hole transporting material used for the hole transporting layer is such that its triplet energy is the excitation energy of the phosphorescent light emitting material in the light emitting layer. — Larger is preferable.
- TPD and NPD have triplet energies of 2.46 eV and 2.51 eV, respectively.
- the phosphorescent light-emitting material in the light-emitting layer used in the present invention is, for example, as described above ( Triple of K—10): 3 ⁇ 4 Since the energy is 2.55 eV, the excitation of the light emitting layer is ⁇ ! I lose my dog status. In other words, a hole transport material having a triplet energy greater than 2.55 eV has a small degree of deactivation and a high luminous efficiency.
- hole transport material having a triplet energy greater than 2.55 eV used in the present invention include the following general formulas (10), (12), (14) to (17). And (19) are preferred, and they preferably have no fused aromatic ring.
- R 1 to R 3 are each a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, and a substituted or unsubstituted alcohol group having 1 to 30 carbon atoms.
- B is an aliphatic ring residue such as cyclohexylene or adamantyl, and is preferably represented by the following general formula (11).
- C represents an aliphatic ring residue shown
- Y represents a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group.
- N represents an integer of 2 to 7 and m represents an integer of 0 to 2.
- A is a diamine derivative residue represented by the following general formula (13)
- B is an adamantyl aliphatic cyclic group, preferably an aliphatic ring residue represented by the general formula (11). Respectively.
- R 1 to R 9 represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted thioalkoxy group, a cyano group, an amino group, Mono- or di-substituted amino group, hydroxyl group, mercapto group, substituted or unsubstituted aryloxy group, substituted or unsubstituted arylthio group, substituted or unsubstituted aromatic ring group, substituted or unsubstituted heterocyclic group Represents (however, at least one of R 1 to R 3 , R 4 to R 6, and R 7 to R 9 is not a hydrogen atom.
- X is phenyl, biphenyl or phenyl.
- Ar 5 ' ⁇ Ar 9 are each unsubstituted or alkyl group, an aromatic group, which is the number 6-1 8 carbon atoms substituted with an alkoxy group, it may be the same or different from each other, A r 5 to Ar Preferably, at least one of 9 is a biphenyl or t-phenyl group, and X is a divalent group consisting of a single bond, phenylene, biphenylyl, dialkyl or diaryl rubazole. )
- a r 1, A r 2 is the ⁇ Li Ichiru group of the substituted or unsubstituted carbon atoms. 6 to 1 8
- R is a substituted or unsubstituted alkyl group having a carbon number of 1-3 0
- X represents a single bond, alkylene, 10_ or 1S-
- X represents A diamine compound represented by the formula:
- Ar 1 represents a substituted or unsubstituted aryl group having 6 to 18 carbon atoms
- Ar 2 to Ar 5 represent a substituted or unsubstituted arylene group having 6 to 18 nuclear carbon atoms, respectively.
- X 1 represents a group represented by a single bond, 10-, 1- , or alkylene; these linking groups may or may not be present;
- X 2 and X 3 each represent a single bond; A bond, a 10-, a 1-, or an alkylene group, which may be the same or different.].
- R 1 to R 12 each represent a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an alkenyl group, a cyano group, an amino group, an acyl group, an alkoxycarbonyl group, a carboxyl group, an alkoxy group, , An alkylamino group, an aralkylamino group, a haloalkyl group, a hydroxyl group, an aryloxy group, a substituted or unsubstituted aromatic hydrocarbon ring group or an aromatic heterocyclic group, R 1 and R 2 , R 3 and R 4 , R 5 and R 6 , R 7 and R 8 , R 9 and R 1 Q , and R 11 and R 12 may form a ring with adjacent substituents.
- X represents a trivalent linking group shown below
- Ar 1 is a substituted or unsubstituted aromatic hydrocarbon ring group, aromatic heterocyclic group, or a group represented by the following general formula (18).
- R 13 to R 18 each represent a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an alkenyl group, a cyano group, a substituted or unsubstituted amino group, an acyl group, an alkoxycarbonyl group, and a carboxyl group.
- R is an alkyl group, an aralkyl group, a substituted or unsubstituted amino group, an acyl group, an alkoxylcarbonyl group, an alkoxyl group, an alkoxy group, an alkylamino group, an aralkylamino group, a haloalkyl group, a hydroxyl group, A aryloxy group, a substituted or unsubstituted aromatic hydrocarbon ring group or an aromatic heterocyclic group.
- the element configuration of the organic EL device of the present invention includes anode / light-emitting layer / electron injection layer / cathode, anode / hole injection layer / light-emitting layer / electron injection layer / cathode, and anode / hole injection layer / hole transport layer.
- an inorganic compound layer composed of an insulator or a semiconductor or an electron transport layer may be provided between the electron injection layer and the cathode. These layers can effectively prevent current leakage and improve electron injection.
- 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. . It is preferable that the electron transporting layer is made of such an alkali metal chalcogenide, since the electron injecting property can be further improved.
- Al force Li alloy ⁇ chalcogenide de not preferred, for example, L i 2 0, L i 0, N a 2 S, N a 2 S e, N a O , and the like, preferably alkaline earth
- metal chalcogenides include C a O, B a O, S r ⁇ , B e O, B a S, and C a Se.
- Can be Preferred alkali metal halides include, for example, LiF, NaF, KF, LiCl, KCl, NaCl, and the like.
- Preferred examples of the alkaline earth metal halide include fluorides such as CaF 2 , BaF 2 , SrF 2 , MgF 2 and BeF 2 , and halides other than fluorides.
- Semiconductors constituting the electron transport layer include Ba, Ca, Sr, Yb, A and Ga, In, Li, Na, Cd, Mg, Si, Ta, and! ! And oxides, nitrides, oxynitrides, and the like containing at least one of the above elements alone or in combination of two or more.
- the inorganic compound constituting the electron transporting layer is a microcrystalline or amorphous insulating thin film. If the electron transport layer is composed of these insulating thin films, a more uniform thin film is formed, and thus pixel defects such as dark spots can be reduced. Examples of such inorganic compounds include the above-described alkali metal chalcogenides, alkaline earth metal chalcogenides, halides of alkali metals, and halides of alkali earth metals.
- the hole injection / transport layer is a layer that assists hole injection into the light emitting layer and transports it to the light emitting region. It has a large hole mobility and a small ionization energy of usually 5.5 eV or less.
- a hole injecting / transporting layer a material that transports holes to the light emitting layer with a lower electric field strength is preferable, and furthermore, when the hole mobility is, for example, 10 4 to 10 6 V / cm when an electric field is applied.
- 10-6 preferably has at cm 2 / V ⁇ sec or higher, 10-5 cm 2 / V 'seconds or more in which one is more preferable.
- the anode of the organic EL element plays a role of injecting holes into the hole transport layer or the light emitting layer, and is effective if it has 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, and copper.
- ITO indium tin oxide alloy
- NESA tin oxide
- gold gold
- silver platinum
- platinum platinum
- copper copper
- the cathode a material having a small work function is preferable in order to inject electrons into the electron transport layer or the light emitting layer.
- the material of the cathode is not particularly limited, but specifically, indium, aluminum, Examples include magnesium, magnesium-indium alloy, magnesium-aluminum alloy, aluminum-lithium alloy, aluminum-scandium-lithium alloy, and magnesium-silver alloy.
- the method for forming each layer in the organic EL device of the present invention is not particularly limited, and a conventionally known formation method such as a vacuum evaporation method and a spin coating method can be used.
- the organic thin film layer used in the organic EL device of the present invention may be formed by vacuum deposition, molecular beam deposition (MBE), dipping of a solution dissolved in a solvent, spin coating, casting, bar coating, roll coating. It can be formed by a known method such as a coating method.
- each organic thin-film layer in the organic EL device of the present invention is not particularly limited. However, if the thickness is too small, defects such as pinholes are likely to occur. Conversely, if the thickness is too large, a high applied voltage is required. Usually, a range of a few nm to 1 m is preferred because of inefficiency.
- the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.
- the triplet energy, singlet energy and ionization potential of the compound were measured as follows.
- a 25 mm ⁇ 75 mm ⁇ 1.1 mm thick glass substrate with IT0 transparent electrode (manufactured by Geomatic) was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, and then UV ozone cleaning for 30 minutes.
- the washed glass substrate with a transparent electrode is mounted on a substrate holder of a vacuum evaporation apparatus.
- This CuPc film functions as a hole injection layer.
- the following TPAC having a thickness of 30 nm was formed on the CuPc film.
- This TPAC film functions as a hole transport layer.
- the following compound PB102 having a thickness of 30 nm was deposited on the TPAC film to form a light emitting layer.
- the concentration of (K one 3) is a light emitting layer 7 by weight 0/0.
- This film functions as a light emitting layer.
- a 2 Onm-thick tris (8-quinolinol) A1 complex (hereinafter referred to as Alq) was provided.
- This Alq film functions as an electron injection layer.
- the reducing dopant Li Li source: manufactured by SAES Getter Co., Ltd.
- An A1q: Li film was formed to a thickness of 10 nm as an injection layer.
- a metal A1 was vapor-deposited on the A1q: Li film to form a metal cathode to produce an organic EL device.
- Type of host material in light emitting layer ionization potential, energy gap (singlet energy) and triplet energy, type of phosphorescent light emitting material (metal complex) in light emitting layer and triplet energy, electron in electron injection layer Types of transport materials, energy Table 1 shows the values of the energy gap and triplet energy, and the materials of the hole transport layer.
- Comparative Example 1 Comparative example using hole transporting light emitting layer and hole blocking layer
- a 25 mm ⁇ 75 mm ⁇ 1.1 mm thick glass substrate with an IT 0 transparent electrode (manufactured by Dioma Tex Corporation) was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, and then UV ozone cleaning for 30 minutes.
- the washed glass substrate with a transparent electrode is mounted on a substrate holder of a vacuum evaporation apparatus.
- This CuPc film functions as a hole injection layer.
- the NPD having a thickness of 30 nm was formed on this film. This NPD film functions as a hole transport layer.
- Metal A1 was vapor-deposited on the A1q: Li film to form a metal cathode, thereby producing an organic EL device.
- Type of host material in light emitting layer ionization potential, energy gap (singlet energy) and triplet energy, type of phosphorescent light emitting material (metal complex) in light emitting layer and triplet energy, electron in electron injection layer
- Table 1 shows the types of transport materials, the values of the energy gap and the triplet energy, and the materials of the hole transport layer.
- An organic EL device was prepared in the same manner as in Example 1 except that the above-described CBP having a hole-transporting property was used instead of the compound PB102 as a host material of the light-emitting layer.
- Example 1 instead of the compound PB102, An organic EL device was produced in the same manner except that the following PB115 having electron transportability was used.
- Type of host material in light emitting layer ionization potential, energy gap (singlet energy) and triplet energy, type of phosphorescent light emitting material (metal complex) in light emitting layer and triplet energy, electron in electron injection layer
- Table 1 shows the types of transport materials, energy gap and triplet energy values, and the materials of the hole transport layer.
- Example 1 In Example 1, except that the BA 1 q was used in place of A 1 q and A 1 q: L i for forming an electron injection layer, and the i side was added to the cathode side 2011] 11 of BA 1 q. Produced an organic EL device in the same manner. In this case, the light emitting layer is directly joined to the electron injection layer, and the cathode is joined to the BA1q layer.
- Type of host material in light emitting layer ionization potential, energy gap (singlet energy) and triplet energy, type of phosphorescent light emitting material (metal complex) in light emitting layer and triplet energy, electron in electron injection layer
- Table 1 shows the types of transport materials, the values of the energy gap and the triplet energy, and the materials of the hole transport layer.
- a 25 mm ⁇ 75 mm ⁇ 1.1 mm thick glass substrate with IT0 transparent electrode (manufactured by Geomatic) was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, and then UV ozone cleaning for 30 minutes.
- the washed glass substrate with a transparent electrode is mounted on a substrate holder of a vacuum evaporation apparatus.
- the NPD having a thickness of 50 nm is formed on the surface on the side where the transparent electrode is formed so as to cover the transparent electrode. Filmed. This NPD film functions as a hole transport layer.
- the above-described PB115 having a thickness of 30 nm having an electron transporting property was deposited as a host material to form a light emitting layer.
- the above (K-10) was added as a phosphorescent Ir metal complex. (K-10) concentration is in the light-emitting layer 5 wt 0/0. This film functions as a light emitting layer.
- Al Q having a thickness of 1 Onm was deposited as an electron injection layer.
- the reducing dopant Li Li source: manufactured by Saesgetter
- An A1q: Li film was formed to a thickness of 30 nm as an electron injection layer.
- Metal A1 was vapor-deposited on the A1q: Li film to form a metal cathode, thereby producing an organic EL device.
- Type of host material in light emitting layer ionization potential, energy gap (singlet energy) and triplet energy, type of phosphorescent light emitting material (metal complex) in light emitting layer and triplet energy, electron in electron injection layer
- Table 1 shows the types of transport materials, the values of the energy gap and the triplet energy, and the materials of the hole transport layer.
- An organic EL device was prepared in the same manner as in Example 4 except that the above-described CBP having a hole-transporting property was used instead of the compound PB115 as the host material of the light-emitting layer.
- Comparative Example 4 (Comparative example using an electron transporting light-emitting layer containing a host material having an ionization potential greater than 5.9 eV) ''
- An organic EL device was prepared in the same manner as in Example 4, except that the following BCP having an electron transporting property was used instead of the compound PB115 as the host material of the light emitting layer.
- the characteristics of the obtained device were evaluated. At a DC voltage of 6.2 V, green light emission of 3200 cd / m 2 and luminous efficiency of 30.2 cd / A were obtained. The quenching of the layers is avoided. However, in order to obtain the same luminous efficiency as the organic EL element of Example 4, a voltage higher by 1.7 V was necessary. This is because holes cannot be injected due to the high ionization potential of BCP. Table 1 shows these results.
- Example 2 the following TCT A was used in place of TPAC as a material for the hole transport layer, and instead of adding (K-3) as a phosphorescent Ir metal complex, the above (K-23) was replaced with (K-3).
- An organic EL device was produced in the same manner except that the above (A17) was used instead of A1q as the electron transport material in the electron injection layer.
- Type of host material in light emitting layer ionization potential, energy gap (singlet energy) and triplet energy, type of phosphorescent light emitting material (metal complex) in light emitting layer and triplet energy, electron in electron injection layer
- Table 1 shows the types of transport materials, the values of the energy gap and the triplet energy, and the materials of the hole transport layer.
- An organic EL device was fabricated in the same manner as in Example 5, except that the above (C-15) was used instead of (A-7) as the electron transport material in the electron injection layer.
- Type of host material in light emitting layer ionization potential, energy gap (singlet energy) and triplet energy, type of phosphorescent light emitting material (metal complex) in light emitting layer and triplet energy, electron in electron injection layer
- Table 1 shows the types of transport materials, the values of the energy gap and the triplet energy, and the materials of the hole transport layer.
- An organic EL device was fabricated in the same manner as in Example 5, except that the compound PB115 was used as the host material of the light-emitting layer instead of the compound PB115.
- the characteristics of the obtained device were evaluated, only a blue-green light emission of 102 cd / m 2 and luminous efficiency of 9.2 cd / A was obtained at a DC voltage of 6.3 V.
- the luminous efficiency was significantly lower than in Example 5. This is because the excited state of the light emitting layer was deactivated and quenched because the hole transporting compound was used as the host material in the light emitting layer. Table 1 shows the results.
- Comparative Example 6 Comparative example using an electron transporting light-emitting layer containing a host material having an ionization potential greater than 5.9 eV
- Example 5 the following TPBI (2, 2 ', 2',-(1,3,5-phenylene)) having an electron-transporting property was used as the host material of the light-emitting layer instead of the compound PB115.
- TPBI 2, 2 ', 2',-(1,3,5-phenylene)
- Example 5 the following TPBI (2, 2 ', 2',-(1,3,5-phenylene)) having an electron-transporting property was used as the host material of the light-emitting layer instead of the compound PB115.
- TPBI 2, 2 ', 2',-(1,3,5-phenylene) having an electron-transporting property
- Type of host material in light emitting layer ionization potential, energy gap (singlet energy) and triplet energy, type of phosphorescent light emitting material (metal complex) in light emitting layer and triplet energy, electron in electron injection layer
- Table 1 shows the types of transport materials, energy gap and triplet energy values, and the materials of the hole transport layer.
- the energy gap of the host material in the light emitting layer was larger than the energy gap of the electron transport material in the electron injection layer, so that energy transfer occurred. However, the excited state may be quenched.
- the triplet energy of the host material and the triplet energy of the metal complex in the light emitting layer are larger than the triplet energy of the electron transporting material in the electron injection layer, energy transfer occurs and the excited state may be quenched. is there.
- the use of an electron-transporting light-emitting layer enabled high luminous efficiency.
- Example 4 and Comparative Example 4 were compared with each other, and Example 5 and Comparative Example 6 were respectively compared, it was found that low voltage driving was possible because the ionization potential of the host material in the light emitting layer was small.
- the organic electroluminescent device of the present invention has a phosphorescent light emitting layer because the light emitting layer and the electron injection layer constituting the device satisfy specific conditions and use the electron transporting light emitting layer. And high luminous efficiency. Therefore, it is useful as an organic electroluminescent element for full power.
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Abstract
Description
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EP03751304A EP1551206A4 (en) | 2002-10-09 | 2003-10-01 | ORGANIC ELECTROLUMINESCENCE ELEMENT |
JP2004542820A JPWO2004034751A1 (ja) | 2002-10-09 | 2003-10-01 | 有機エレクトロルミネッセンス素子 |
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Also Published As
Publication number | Publication date |
---|---|
EP1551206A1 (en) | 2005-07-06 |
US8623524B2 (en) | 2014-01-07 |
EP1551206A4 (en) | 2007-12-05 |
KR20050074478A (ko) | 2005-07-18 |
US20130126849A1 (en) | 2013-05-23 |
CN1703937B (zh) | 2010-11-24 |
CN1703937A (zh) | 2005-11-30 |
JP5121873B2 (ja) | 2013-01-16 |
TW200421903A (en) | 2004-10-16 |
JP2010161410A (ja) | 2010-07-22 |
JPWO2004034751A1 (ja) | 2006-02-09 |
KR101016164B1 (ko) | 2011-02-17 |
US20060257684A1 (en) | 2006-11-16 |
TWI360363B (ja) | 2012-03-11 |
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