WO2016010402A1 - Organic electroluminescent device - Google Patents
Organic electroluminescent device Download PDFInfo
- Publication number
- WO2016010402A1 WO2016010402A1 PCT/KR2015/007462 KR2015007462W WO2016010402A1 WO 2016010402 A1 WO2016010402 A1 WO 2016010402A1 KR 2015007462 W KR2015007462 W KR 2015007462W WO 2016010402 A1 WO2016010402 A1 WO 2016010402A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- substituted
- unsubstituted
- arylsilyl
- alkyl
- tri
- Prior art date
Links
- 150000001875 compounds Chemical class 0.000 claims abstract description 84
- 230000005525 hole transport Effects 0.000 claims abstract description 32
- 239000010410 layer Substances 0.000 claims description 115
- 125000003118 aryl group Chemical group 0.000 claims description 51
- 125000005104 aryl silyl group Chemical group 0.000 claims description 48
- 125000001072 heteroaryl group Chemical group 0.000 claims description 42
- 125000000923 (C1-C30) alkyl group Chemical group 0.000 claims description 30
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 30
- 239000002019 doping agent Substances 0.000 claims description 27
- -1 benzofluorenyl Chemical group 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 125000002950 monocyclic group Chemical group 0.000 claims description 22
- 125000001424 substituent group Chemical group 0.000 claims description 22
- 229910052739 hydrogen Inorganic materials 0.000 claims description 21
- 239000001257 hydrogen Substances 0.000 claims description 21
- 229910052736 halogen Inorganic materials 0.000 claims description 19
- 150000002367 halogens Chemical class 0.000 claims description 19
- 150000002431 hydrogen Chemical class 0.000 claims description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 125000004432 carbon atom Chemical group C* 0.000 claims description 15
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 15
- 125000005842 heteroatom Chemical group 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 229910052717 sulfur Inorganic materials 0.000 claims description 15
- 125000003367 polycyclic group Chemical group 0.000 claims description 14
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 claims description 13
- 125000002723 alicyclic group Chemical group 0.000 claims description 13
- 229910052805 deuterium Inorganic materials 0.000 claims description 13
- 125000000304 alkynyl group Chemical group 0.000 claims description 12
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical class C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 12
- 239000012044 organic layer Substances 0.000 claims description 12
- 125000000739 C2-C30 alkenyl group Chemical group 0.000 claims description 11
- 125000001769 aryl amino group Chemical group 0.000 claims description 11
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 239000011593 sulfur Substances 0.000 claims description 10
- 125000006822 tri(C1-C30) alkylsilyl group Chemical group 0.000 claims description 10
- 125000006749 (C6-C60) aryl group Chemical group 0.000 claims description 9
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 9
- 125000000732 arylene group Chemical group 0.000 claims description 8
- 235000010290 biphenyl Nutrition 0.000 claims description 6
- 239000004305 biphenyl Substances 0.000 claims description 6
- 125000001624 naphthyl group Chemical group 0.000 claims description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 6
- 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 claims description 5
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Natural products C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 claims description 5
- 125000003454 indenyl group Chemical group C1(C=CC2=CC=CC=C12)* 0.000 claims description 5
- 125000005956 isoquinolyl group Chemical group 0.000 claims description 5
- 125000004076 pyridyl group Chemical group 0.000 claims description 5
- 125000000714 pyrimidinyl group Chemical group 0.000 claims description 5
- 125000000168 pyrrolyl group Chemical group 0.000 claims description 5
- 125000002294 quinazolinyl group Chemical group N1=C(N=CC2=CC=CC=C12)* 0.000 claims description 5
- 125000005493 quinolyl group Chemical group 0.000 claims description 5
- 125000001567 quinoxalinyl group Chemical group N1=C(C=NC2=CC=CC=C12)* 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 125000004306 triazinyl group Chemical group 0.000 claims description 5
- FCEHBMOGCRZNNI-UHFFFAOYSA-N 1-benzothiophene Chemical class C1=CC=C2SC=CC2=C1 FCEHBMOGCRZNNI-UHFFFAOYSA-N 0.000 claims description 4
- 125000002178 anthracenyl group Chemical group C1(=CC=CC2=CC3=CC=CC=C3C=C12)* 0.000 claims description 4
- 125000005874 benzothiadiazolyl group Chemical group 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 4
- 125000000259 cinnolinyl group Chemical group N1=NC(=CC2=CC=CC=C12)* 0.000 claims description 4
- 125000002883 imidazolyl group Chemical group 0.000 claims description 4
- 125000003453 indazolyl group Chemical group N1N=C(C2=C1C=CC=C2)* 0.000 claims description 4
- 125000001041 indolyl group Chemical group 0.000 claims description 4
- 125000000904 isoindolyl group Chemical group C=1(NC=C2C=CC=CC12)* 0.000 claims description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N monobenzene Natural products C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 4
- 125000001792 phenanthrenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C=CC12)* 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 125000003373 pyrazinyl group Chemical group 0.000 claims description 4
- 125000003226 pyrazolyl group Chemical group 0.000 claims description 4
- 125000002098 pyridazinyl group Chemical group 0.000 claims description 4
- 125000001935 tetracenyl group Chemical group C1(=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C12)* 0.000 claims description 4
- 125000005247 tetrazinyl group Chemical group N1=NN=NC(=C1)* 0.000 claims description 4
- 125000003831 tetrazolyl group Chemical group 0.000 claims description 4
- 125000001425 triazolyl group Chemical group 0.000 claims description 4
- 125000002676 chrysenyl group Chemical group C1(=CC=CC=2C3=CC=C4C=CC=CC4=C3C=CC12)* 0.000 claims description 3
- 125000003914 fluoranthenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC=C4C1=C23)* 0.000 claims description 3
- 125000003983 fluorenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3CC12)* 0.000 claims description 3
- 125000004593 naphthyridinyl group Chemical group N1=C(C=CC2=CC=CN=C12)* 0.000 claims description 3
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 claims description 3
- 125000001725 pyrenyl group Chemical group 0.000 claims description 3
- 125000003960 triphenylenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C3=CC=CC=C3C12)* 0.000 claims description 3
- HIYWOHBEPVGIQN-UHFFFAOYSA-N 1h-benzo[g]indole Chemical class C1=CC=CC2=C(NC=C3)C3=CC=C21 HIYWOHBEPVGIQN-UHFFFAOYSA-N 0.000 claims description 2
- RFRXIWQYSOIBDI-UHFFFAOYSA-N benzarone Chemical class CCC=1OC2=CC=CC=C2C=1C(=O)C1=CC=C(O)C=C1 RFRXIWQYSOIBDI-UHFFFAOYSA-N 0.000 claims description 2
- 150000001555 benzenes Chemical class 0.000 claims description 2
- 125000003785 benzimidazolyl group Chemical group N1=C(NC2=C1C=CC=C2)* 0.000 claims description 2
- SIKJAQJRHWYJAI-UHFFFAOYSA-N benzopyrrole Natural products C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 claims description 2
- PZOUSPYUWWUPPK-UHFFFAOYSA-N indole Natural products CC1=CC=CC2=C1C=CN2 PZOUSPYUWWUPPK-UHFFFAOYSA-N 0.000 claims description 2
- RKJUIXBNRJVNHR-UHFFFAOYSA-N indolenine Natural products C1=CC=C2CC=NC2=C1 RKJUIXBNRJVNHR-UHFFFAOYSA-N 0.000 claims description 2
- 150000002475 indoles Chemical class 0.000 claims description 2
- 239000000463 material Substances 0.000 description 46
- 0 *1c(c(-c2ccc(*(c(cc3)c-4cc3-c3cc(-c5ccccc5*5c6ccccc6)c5cc3)c3cccc(-c5ccccc5)c3)c-4c2)ccc2)c2-c2c1cccc2 Chemical compound *1c(c(-c2ccc(*(c(cc3)c-4cc3-c3cc(-c5ccccc5*5c6ccccc6)c5cc3)c3cccc(-c5ccccc5)c3)c-4c2)ccc2)c2-c2c1cccc2 0.000 description 26
- 238000002347 injection Methods 0.000 description 23
- 239000007924 injection Substances 0.000 description 23
- 238000000151 deposition Methods 0.000 description 16
- 125000004169 (C1-C6) alkyl group Chemical group 0.000 description 13
- 230000000903 blocking effect Effects 0.000 description 11
- 239000000758 substrate Substances 0.000 description 8
- 125000000008 (C1-C10) alkyl group Chemical group 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- IMKMFBIYHXBKRX-UHFFFAOYSA-M lithium;quinoline-2-carboxylate Chemical compound [Li+].C1=CC=CC2=NC(C(=O)[O-])=CC=C21 IMKMFBIYHXBKRX-UHFFFAOYSA-M 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- 230000003139 buffering effect Effects 0.000 description 5
- TXCDCPKCNAJMEE-UHFFFAOYSA-N dibenzofuran Chemical compound C1=CC=C2C3=CC=CC=C3OC2=C1 TXCDCPKCNAJMEE-UHFFFAOYSA-N 0.000 description 5
- IYYZUPMFVPLQIF-UHFFFAOYSA-N dibenzothiophene Chemical compound C1=CC=C2C3=CC=CC=C3SC2=C1 IYYZUPMFVPLQIF-UHFFFAOYSA-N 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- MESMXXUBQDBBSR-UHFFFAOYSA-N n,9-diphenyl-n-[4-[4-(n-(9-phenylcarbazol-3-yl)anilino)phenyl]phenyl]carbazol-3-amine Chemical compound C1=CC=CC=C1N(C=1C=C2C3=CC=CC=C3N(C=3C=CC=CC=3)C2=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C=C3C4=CC=CC=C4N(C=4C=CC=CC=4)C3=CC=2)C=C1 MESMXXUBQDBBSR-UHFFFAOYSA-N 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 125000004429 atom Chemical group 0.000 description 4
- 238000010549 co-Evaporation Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- OMDTUSYJJFBYMG-UHFFFAOYSA-N 2,4-bis(9,9-dimethylfluoren-2-yl)-6-naphthalen-2-yl-1,3,5-triazine Chemical compound C1=CC=C2C(C)(C)C3=CC(C=4N=C(N=C(N=4)C=4C=C5C=CC=CC5=CC=4)C4=CC=C5C6=CC=CC=C6C(C5=C4)(C)C)=CC=C3C2=C1 OMDTUSYJJFBYMG-UHFFFAOYSA-N 0.000 description 3
- RWRDLPDLKQPQOW-UHFFFAOYSA-N Pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 description 3
- 150000001716 carbazoles Chemical class 0.000 description 3
- 150000004770 chalcogenides Chemical class 0.000 description 3
- 150000004826 dibenzofurans Chemical class 0.000 description 3
- IYYZUPMFVPLQIF-ALWQSETLSA-N dibenzothiophene Chemical class C1=CC=CC=2[34S]C3=C(C=21)C=CC=C3 IYYZUPMFVPLQIF-ALWQSETLSA-N 0.000 description 3
- 150000002220 fluorenes Chemical class 0.000 description 3
- 229910052741 iridium Inorganic materials 0.000 description 3
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 3
- 229910001507 metal halide Inorganic materials 0.000 description 3
- 150000005309 metal halides Chemical class 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical compound 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 3
- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
- NIHNNTQXNPWCJQ-UHFFFAOYSA-N o-biphenylenemethane Natural products C1=CC=C2CC3=CC=CC=C3C2=C1 NIHNNTQXNPWCJQ-UHFFFAOYSA-N 0.000 description 3
- 125000006736 (C6-C20) aryl group Chemical group 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 2
- GJWBRYKOJMOBHH-UHFFFAOYSA-N 9,9-dimethyl-n-[4-(9-phenylcarbazol-3-yl)phenyl]-n-(4-phenylphenyl)fluoren-2-amine Chemical compound C1=C2C(C)(C)C3=CC=CC=C3C2=CC=C1N(C=1C=CC(=CC=1)C=1C=C2C3=CC=CC=C3N(C=3C=CC=CC=3)C2=CC=1)C(C=C1)=CC=C1C1=CC=CC=C1 GJWBRYKOJMOBHH-UHFFFAOYSA-N 0.000 description 2
- UJOBWOGCFQCDNV-UHFFFAOYSA-N 9H-carbazole Chemical compound C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 2
- OKGOSRTVQUNIAC-UHFFFAOYSA-O CC(C)(c(cccc1)c1-c1ccc2c(cc3)c4cc3-c3ccccc3)c1c2[n]4[NH+]1C(C2=CCCC=C2)NC1c1ccccc1 Chemical compound CC(C)(c(cccc1)c1-c1ccc2c(cc3)c4cc3-c3ccccc3)c1c2[n]4[NH+]1C(C2=CCCC=C2)NC1c1ccccc1 OKGOSRTVQUNIAC-UHFFFAOYSA-O 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 125000000609 carbazolyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3NC12)* 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 125000005509 dibenzothiophenyl group Chemical group 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000005281 excited state Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 125000000592 heterocycloalkyl group Chemical group 0.000 description 2
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052762 osmium Inorganic materials 0.000 description 2
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 125000004934 phenanthridinyl group Chemical group C1(=CC=CC2=NC=C3C=CC=CC3=C12)* 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 125000006651 (C3-C20) cycloalkyl group Chemical group 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- 125000004973 1-butenyl group Chemical group C(=CCC)* 0.000 description 1
- 125000004972 1-butynyl group Chemical group [H]C([H])([H])C([H])([H])C#C* 0.000 description 1
- 125000006017 1-propenyl group Chemical group 0.000 description 1
- 125000000530 1-propynyl group Chemical group [H]C([H])([H])C#C* 0.000 description 1
- IIGPSNYFBIEPKR-UHFFFAOYSA-N 2,4,6-tris(9,9-dimethylfluoren-2-yl)-1,3,5-triazine Chemical compound C1=CC=C2C(C)(C)C3=CC(C=4N=C(N=C(N=4)C=4C=C5C(C)(C)C6=CC=CC=C6C5=CC=4)C4=CC=C5C6=CC=CC=C6C(C5=C4)(C)C)=CC=C3C2=C1 IIGPSNYFBIEPKR-UHFFFAOYSA-N 0.000 description 1
- 125000004974 2-butenyl group Chemical group C(C=CC)* 0.000 description 1
- 125000000069 2-butynyl group Chemical group [H]C([H])([H])C#CC([H])([H])* 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 125000001494 2-propynyl group Chemical group [H]C#CC([H])([H])* 0.000 description 1
- 125000004975 3-butenyl group Chemical group C(CC=C)* 0.000 description 1
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- XGCQUNQVTHAWOQ-UHFFFAOYSA-O C(C1)C=CC=C1C1[NH+]=C(c2ccccc2)NC(C(C=CC2)=CC2[n](c(cccc2)c2c2c3)c2cc2c3c(cccc3)c3[n]2-c2cc(-c3ccccc3)ccc2)N1 Chemical compound C(C1)C=CC=C1C1[NH+]=C(c2ccccc2)NC(C(C=CC2)=CC2[n](c(cccc2)c2c2c3)c2cc2c3c(cccc3)c3[n]2-c2cc(-c3ccccc3)ccc2)N1 XGCQUNQVTHAWOQ-UHFFFAOYSA-O 0.000 description 1
- ZUBDTJCDPRGLNV-UHFFFAOYSA-O C(C1)C=Cc2c1c(cc1[s]c(C=CCC3)c3c1c1)c1[n]2-c1cccc(C2NC(c3cc(-c4ccccc4)ccc3)[NH2+]C(c3ccccc3)N2)c1 Chemical compound C(C1)C=Cc2c1c(cc1[s]c(C=CCC3)c3c1c1)c1[n]2-c1cccc(C2NC(c3cc(-c4ccccc4)ccc3)[NH2+]C(c3ccccc3)N2)c1 ZUBDTJCDPRGLNV-UHFFFAOYSA-O 0.000 description 1
- URBSAIMBWGZXEV-UHFFFAOYSA-N C(C1N2)=CC=CC1=C(c(cc1)ccc1-c1ccccc1)NC2[n](c(cccc1)c1c1ccc2c3c4cccc3)c1c2[n]4-c1ccccc1 Chemical compound C(C1N2)=CC=CC1=C(c(cc1)ccc1-c1ccccc1)NC2[n](c(cccc1)c1c1ccc2c3c4cccc3)c1c2[n]4-c1ccccc1 URBSAIMBWGZXEV-UHFFFAOYSA-N 0.000 description 1
- YAOSWBKROIQAOF-UHFFFAOYSA-O C(C1c(c2c3C4(c5ccccc5)c5ccccc5)ccc3-c3c4cccc3)=CC=CC1N2c1cc(C2=[NH+]C(c3ccccc3)NC(c3ccccc3)=N2)ccc1 Chemical compound C(C1c(c2c3C4(c5ccccc5)c5ccccc5)ccc3-c3c4cccc3)=CC=CC1N2c1cc(C2=[NH+]C(c3ccccc3)NC(c3ccccc3)=N2)ccc1 YAOSWBKROIQAOF-UHFFFAOYSA-O 0.000 description 1
- CZZYITDELCSZES-UHFFFAOYSA-N C(c1ccccc1)c1ccccc1 Chemical compound C(c1ccccc1)c1ccccc1 CZZYITDELCSZES-UHFFFAOYSA-N 0.000 description 1
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- DHQRROVSXSXLHC-UHFFFAOYSA-N c(cc1)ccc1-c(cc1)ccc1-[n]1c(ccc(-c(cc2)ccc2-c(cc2c3ccccc33)ccc2[n]3-c(cc2)ccc2-c2ccccc2)c2)c2c2ccccc12 Chemical compound c(cc1)ccc1-c(cc1)ccc1-[n]1c(ccc(-c(cc2)ccc2-c(cc2c3ccccc33)ccc2[n]3-c(cc2)ccc2-c2ccccc2)c2)c2c2ccccc12 DHQRROVSXSXLHC-UHFFFAOYSA-N 0.000 description 1
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- DCYDNVKMGOKXCG-UHFFFAOYSA-O c1ccc(C([N-]C2c3cc(-c4ccccc4)ccc3)[NH+]2c(cc2)ccc2-[n]2c3c4[o]c5ccccc5c4ccc3c3c2cccc3)cc1 Chemical compound c1ccc(C([N-]C2c3cc(-c4ccccc4)ccc3)[NH+]2c(cc2)ccc2-[n]2c3c4[o]c5ccccc5c4ccc3c3c2cccc3)cc1 DCYDNVKMGOKXCG-UHFFFAOYSA-O 0.000 description 1
- GIYJLFXJTRNVGP-UHFFFAOYSA-O c1ccc(C([NH2+]C=2c3ccccc3)[N+]=2#Cc2cccc(-[n]3c(cc(c4ccccc4[o]4)c4c4)c4c4ccccc34)c2)cc1 Chemical compound c1ccc(C([NH2+]C=2c3ccccc3)[N+]=2#Cc2cccc(-[n]3c(cc(c4ccccc4[o]4)c4c4)c4c4ccccc34)c2)cc1 GIYJLFXJTRNVGP-UHFFFAOYSA-O 0.000 description 1
- QVRDSCRCGXDKJL-UHFFFAOYSA-N c1ccc(C(c(cccc2)c2-c2ccc3c4c5cccc4)(c2c3[n]5-c2nc(cccc3)c3nc2-c2ccccc2)c2ccccc2)cc1 Chemical compound c1ccc(C(c(cccc2)c2-c2ccc3c4c5cccc4)(c2c3[n]5-c2nc(cccc3)c3nc2-c2ccccc2)c2ccccc2)cc1 QVRDSCRCGXDKJL-UHFFFAOYSA-N 0.000 description 1
- HYMWXUSBUUDXHP-UHFFFAOYSA-O c1ccc(C2N=C(c(cc3)ccc3-[n](c(cccc3)c3c3c4)c3cc3c4[o]c4ccccc34)N=C(c3ccccc3)[NH2+]2)cc1 Chemical compound c1ccc(C2N=C(c(cc3)ccc3-[n](c(cccc3)c3c3c4)c3cc3c4[o]c4ccccc34)N=C(c3ccccc3)[NH2+]2)cc1 HYMWXUSBUUDXHP-UHFFFAOYSA-O 0.000 description 1
- JVEUZFMRHGYGFC-UHFFFAOYSA-O c1ccc(C2[NH2+]C(c3cccc(-[n]4c(cc(c(c5c6cccc5)c5)[n]6-c6ccccc6)c5c5c4cccc5)c3)Nc3ccccc23)cc1 Chemical compound c1ccc(C2[NH2+]C(c3cccc(-[n]4c(cc(c(c5c6cccc5)c5)[n]6-c6ccccc6)c5c5c4cccc5)c3)Nc3ccccc23)cc1 JVEUZFMRHGYGFC-UHFFFAOYSA-O 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
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- 239000011248 coating agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 125000000392 cycloalkenyl group Chemical group 0.000 description 1
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- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 125000001559 cyclopropyl group Chemical group [H]C1([H])C([H])([H])C1([H])* 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
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- 125000005105 dialkylarylsilyl group Chemical group 0.000 description 1
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- AKUNKIJLSDQFLS-UHFFFAOYSA-M dicesium;hydroxide Chemical compound [OH-].[Cs+].[Cs+] AKUNKIJLSDQFLS-UHFFFAOYSA-M 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000003838 furazanyl group Chemical group 0.000 description 1
- 125000002541 furyl group Chemical group 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 125000004356 hydroxy functional group Chemical group O* 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 125000001977 isobenzofuranyl group Chemical group C=1(OC=C2C=CC=CC12)* 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 125000001786 isothiazolyl group Chemical group 0.000 description 1
- 125000000842 isoxazolyl group Chemical group 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 150000007517 lewis acids Chemical class 0.000 description 1
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Inorganic materials [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 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
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- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
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- 125000002971 oxazolyl group Chemical group 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 125000001644 phenoxazinyl group Chemical group C1(=CC=CC=2OC3=CC=CC=C3NC12)* 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 150000003248 quinolines Chemical class 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000005017 substituted alkenyl group Chemical group 0.000 description 1
- 125000000547 substituted alkyl group Chemical group 0.000 description 1
- 125000004426 substituted alkynyl group Chemical group 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- 125000005346 substituted cycloalkyl group Chemical group 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- RAOIDOHSFRTOEL-UHFFFAOYSA-N tetrahydrothiophene Chemical compound C1CCSC1 RAOIDOHSFRTOEL-UHFFFAOYSA-N 0.000 description 1
- 125000001113 thiadiazolyl group Chemical group 0.000 description 1
- 125000000335 thiazolyl group Chemical group 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 125000004665 trialkylsilyl group Chemical group 0.000 description 1
- 125000005106 triarylsilyl group Chemical group 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- 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
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
-
- 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
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
-
- 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
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/20—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
-
- 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
- H10K85/30—Coordination compounds
- H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
- H10K85/342—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising iridium
-
- H—ELECTRICITY
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Definitions
- the present disclosure relates to an organic electroluminescent device.
- An electroluminescent (EL) device is a self-light-emitting device which has advantages in that it provides a wider viewing angle, a greater contrast ratio, and a faster response time.
- An organic EL device was first developed by Eastman Kodak, by using small aromatic diamine molecules and aluminum complexes as materials to form a light-emitting layer [Appl. Phys. Lett. 51, 913, 1987].
- the organic EL device converts electric energy into light when electricity is applied to an organic light-emitting material(s).
- the organic EL device has a structure comprising an anode, a cathode, and an organic layer disposed between the anode and the cathode.
- the organic layer of the organic EL device comprises a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, an electron buffering layer, a hole blocking layer, an electron transport layer, an electron injection layer, etc.
- materials for forming the organic layer can be classified as a hole injection material, a hole transport material, an electron blocking material, a light-emitting material, an electron buffering material, a hole blocking material, an electron transport material, an electron injection material, etc.
- a voltage is applied to the organic EL device, holes and electrons are injected from an anode and a cathode, respectively, to the light-emitting layer.
- Excitons having high energy are formed by recombinations between the holes and the electrons. The energy of excitons puts the light-emitting organic compound in an excited state, and the decay of the excited state results in a relaxation of the energy level into a ground state, accompanied by light-emission.
- the most important factor determining luminous efficiency in the organic EL device is light-emitting materials.
- the light-emitting material needs to have high quantum efficiency, high electron mobility, and high hole mobility.
- the light-emitting layer formed by the light-emitting material needs to be uniform and stable.
- the light-emitting materials can be classified as a blue-, green-, or red-emitting material, and a yellow- or orange-emitting material can be additionally included therein.
- the light-emitting materials can be classified as a host material and a dopant material. Recently, the development of an organic EL device providing high efficiency and long lifespan is an urgent issue.
- the host material acts as a solvent in a solid state and transfers energy, and thus needs to have high purity and a molecular weight appropriate for vacuum deposition. Furthermore, the host material needs to have high glass transition temperature and high thermal degradation temperature to achieve thermal stability; high electro-chemical stability to achieve long lifespan; easiness of forming amorphous thin film; good adhesion to materials of adjacent layers; and non-migration to other layers.
- the light-emitting material may be used as a mixture of a host and a dopant.
- devices showing good electroluminescent characteristics have a structure comprising a light-emitting layer in which a dopant is doped into a host.
- efficiency and lifespan of the device are highly affected by the host material, and thus selection of the host material is important.
- WO 2013/168688 A1, WO 2009/060757 A1, and Japanese Patent Application Laying-Open No. 2013-183036 A disclose an organic electroluminescent device employing a biscarbazole derivative as a host material.
- a biscarbazole derivative in which the nitrogen atoms of the carbazoles are linked to aryls, respectively, and a carbazole derivative in which the nitrogen atom of the carbazole is linked to a nitrogen-containing heteroaryl, and as a hole transport material, a biscarbazole derivative in which the nitrogen atoms of the carbazoles are linked to aryls, respectively.
- the object of the present disclosure is to provide an organic electroluminescent device showing high efficiency and long lifespan.
- an organic electroluminescent device comprising an anode, a cathode, and an organic layer between the anode and the cathode, wherein the organic layer comprises one or more light-emitting layers and one or more hole transport layers; at least one of the one or more light-emitting layers comprises one or more dopant compounds and two or more host compounds; a first host compound of the host compounds is represented by the following formula 1; a second host compound is represented by the following formula 2; and at least one of the one or more hole transport layers comprises the compound represented by the following formula 1:
- a 1 and A 2 each independently, represent a substituted or unsubstituted (C6-C30)aryl, provided that a nitrogen-containing heteroaryl is excluded from the substituent of A 1 and A 2 ;
- L 1 represents a single bond or a substituted or unsubstituted (C6-C30)arylene
- X 1 to X 16 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or un
- Ma represents a substituted or unsubstituted nitrogen-containing 5- to 11-membered heteroaryl
- La represents a single bond, or a substituted or unsubstituted (C6-C30)arylene
- Xa to Xh each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or un
- the heteroaryl contains at least one hetero atom selected from B, N, O, S, Si, and P.
- an organic electroluminescent device having high efficiency and long lifespan is provided.
- the organic electroluminescent device of the present disclosure can be used for the manufacture of a display system or a lighting system.
- the compound of formula 1 may be represented by any one of the following formulae 3, 4, 5, and 6.
- a 1 , A 2 , L 1 and X 1 to X 16 are as defined in formula 1 above.
- a 1 and A 2 each independently, represent a substituted or unsubstituted (C6-C30)aryl.
- a 1 and A 2 each independently, may represent preferably, a substituted or unsubstituted (C6-C18)aryl; and more preferably, a (C6-C18)aryl unsubstituted or substituted with a cyano, a halogen, a (C1-C6)alkyl, a (C6-C12)aryl, or a tri(C6-C12)arylsilyl.
- a 1 and A 2 may be selected from the group consisting of a substituted or unsubstituted phenyl, a substituted or unsubstituted biphenyl, a substituted or unsubstituted terphenyl, a substituted or unsubstituted naphthyl, a substituted or unsubstituted fluorenyl, a substituted or unsubstituted benzofluorenyl, a substituted or unsubstituted phenanthrenyl, a substituted or unsubstituted anthracenyl, a substituted or unsubstituted indenyl, a substituted or unsubstituted triphenylenyl, a substituted or unsubstituted pyrenyl, a substituted or unsubstituted tetracenyl, a substituted or unsubstituted perylenyl, a substituted or unsubstituted, a
- the substituents of the substituted phenyl, etc. may be a cyano, a halogen, a (C1-C6)alkyl, a (C6-C12)aryl, or a tri(C6-C12)arylsilyl.
- X 1 to X 16 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or un
- X 1 to X 16 each independently, may represent hydrogen, a cyano, a substituted or unsubstituted (C1-C10)alkyl, a substituted or unsubstituted (C6-C20)aryl, a substituted or unsubstituted 5- to 20-membered heteroaryl, or a substituted or unsubstituted tri(C6-C12)arylsilyl. More preferably, X 1 to X 16 .
- each independently, may represent hydrogen; a cyano; a (C1-C10)alkyl; a (C6-C20)aryl unsubstituted or substituted with a cyano, a (C1-C10)alkyl, or a tri(C6-C12)arylsilyl; a 5- to 20-membered heteroaryl unsubstituted or substituted with a (C1-C10)alkyl, a (C6-C15)aryl or a tri(C6-C12)arylsilyl; or a tri(C6-C12)arylsilyl unsubstituted or substituted with a (C1-C10)alkyl.
- X 1 to X 16 each independently, may represent hydrogen; a cyano; a (C1-C6)alkyl; phenyl, biphenyl, terphenyl, or naphthyl, unsubstituted or substituted with a cyano, a (C1-C6)alkyl or triphenylsilyl; dibenzothiophene or dibenzofuran, unsubstituted or substituted with a (C1-C6)alkyl, phenyl, biphenyl, naphthyl, or triphenylsilyl; or triphenylsilyl unsubstituted or substituted with a (C1-C6)alkyl.
- L 1 represents a single bond, or a substituted or unsubstituted (C6-C30)arylene.
- L 1 may represent a single bond, or a substituted or unsubstituted (C6-C15)arylene.
- L 1 may represent a single bond, or one selected from the following formulae 7 to 19.
- Xi to Xp each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or un
- Xi to Xp each independently, may represent preferably, hydrogen, a halogen, a cyano, a (C1-C10)alkyl, a (C3-C20)cycloalkyl, a (C6-C12)aryl, a (C1-C6)alkyldi(C6-C12)arylsilyl, or a tri(C6-C12)arylsilyl; and more preferably, hydrogen, a cyano, a (C1-C6)alkyl, or a tri(C6-C12)arylsilyl.
- Ma represents a substituted or unsubstituted nitrogen-containing 5- to 11-membered heteroaryl.
- Ma may represent preferably, a substituted or unsubstituted nitrogen-containing 6- to 10-membered heteroaryl; and more preferably, a nitrogen-containing 6- to 10-membered heteroaryl substituted with an unsubstituted (C6-C18)aryl, a (C6-C12)aryl substituted with a cyano, a (C6-C12)aryl substituted with a (C1-C6)alkyl, a (C6-C12)aryl substituted with a tri(C6-C12)arylsilyl, or a 6- to 15-membered heteroaryl.
- Ma may represent a substituted or unsubstituted monocyclic ring-type heteroaryl selected from the group consisting of a substituted or unsubstituted pyrrolyl, a substituted or unsubstituted imidazolyl, a substituted or unsubstituted pyrazolyl, a substituted or unsubstituted triazinyl, a substituted or unsubstituted tetrazinyl, a substituted or unsubstituted triazolyl, a substituted or unsubstituted tetrazolyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted pyrazinyl, a substituted or unsubstituted pyrimidinyl, and a substituted or unsubstituted pyridazinyl, or a substituted or unsubstituted fused ring-type heteroaryl selected from the group consist
- Ma may represent a substituted or unsubstituted triazinyl, a substituted or unsubstituted pyrimidinyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted quinolyl, a substituted or unsubstituted isoquinolyl, a substituted or unsubstituted quinazolinyl, a substituted or unsubstituted naphthyridinyl, or a substituted or unsubstituted quinoxalinyl.
- the substituents for the substituted pyrrolyl, etc., of Ma may be a (C6-C18)aryl, a (C6-C12)aryl substituted with a cyano, a (C6-C12)aryl substituted with a (C1-C6)alkyl, a (C6-C12)aryl substituted with a tri(C6-C12)arylsilyl, a cyano, a (C1-C6)alkyl, a tri(C6-C12)arylsilyl, or a 6- to 15-membered heteroaryl; and specifically, phenyl, biphenyl, terphenyl, naphthyl, phenylnaphthyl, naphthylphenyl, phenanthrenyl, anthracenyl, dibenzothiophenyl, or dibenzofuranyl, unsubstituted or substituted with a cyano, a (C
- La represents a single bond, or a substituted or unsubstituted (C6-C30)arylene; and preferably, a single bond, or a substituted or unsubstituted (C6-C12)arylene.
- La may represent a single bond, or any one of formulae 7 to 19.
- Xa to Xh each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or un
- Xa to Xh each independently, may represent hydrogen, a cyano, a substituted or unsubstituted (C6-C15)aryl, a substituted or unsubstituted 10- to 20-membered heteroaryl, or a substituted or unsubstituted tri(C6-C10)arylsilyl, or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C6-C20) , mono- or polycyclic, aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur.
- Xa to Xh each independently, may represent hydrogen, a cyano, a (C6-C15)aryl unsubstituted or substituted with a tri(C6-C10)arylsily, or a 10- to 20-membered heteroaryl unsubstituted or substituted with a (C6-C12)aryl, or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted benzene, a substituted or unsubstituted indole, a substituted or unsubstituted benzindole, a substituted or unsubstituted indene, a substituted or unsubstituted benzofuran, or a substituted or unsubstituted benzothiophene.
- (C1-C30)alkyl indicates a linear or branched alkyl having 1 to 30, preferably 1 to 20, and more preferably 1 to 10 carbon atoms, and includes methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, etc.
- “(C2-C30) alkenyl” indicates a linear or branched alkenyl having 2 to 30, preferably 2 to 20, and more preferably 2 to 10 carbon atoms and includes vinyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methylbut-2-enyl, etc.
- (C2-C30)alkynyl indicates a linear or branched alkynyl having 2 to 30, preferably 2 to 20, and more preferably 2 to 10 carbon atoms and includes ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methylpent-2-ynyl, etc.
- “(C3-C30)cycloalkyl” indicates a mono- or polycyclic hydrocarbon having 3 to 30, preferably 3 to 20, and more preferably 3 to 7 ring backbone carbon atoms and includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.
- “3- to 7-membered heterocycloalkyl” indicates a cycloalkyl having 3 to 7, preferably 5 to 7 ring backbone atoms including at least one hetero atom selected from B, N, O, S, Si, and P, preferably O, S, and N, and includes tetrahydrofuran, pyrrolidine, thiolan, tetrahydropyran,
- “(C6-C30)aryl(ene)” indicates a monocyclic or fused ring-based radical derived from an aromatic hydrocarbon and having 6 to 30, preferably 6 to 20, and more preferably 6 to 15 ring backbone carbon atoms, and includes phenyl, biphenyl, terphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, fluorenyl, phenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phen
- “3- to 30-membered heteroaryl” indicates an aryl group having 3 to 30 ring backbone atoms including at least one, preferably 1 to 4, hetero atom selected from the group consisting of B, N, O, S, Si, and P; may be a monocyclic ring, or a fused ring condensed with at least one benzene ring; may be partially saturated; may be one formed by linking at least one heteroaryl or aryl group to a heteroaryl group via a single bond(s); and includes a monocyclic ring-type heteroaryl such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridy
- the “nitrogen-containing 5- to 30-membered heteroaryl” indicates a heteroaryl group having 5 to 30, preferably 5 to 20, and more preferably 5 to 15 ring backbone atoms including at least one, preferably 1 to 4, nitrogen as the hetero atom; may be a monocyclic ring, or a fused ring condensed with at least one benzene ring; may be partially saturated; may be one formed by linking at least one heteroaryl or aryl group to a heteroaryl group via a single bond(s); and includes a monocyclic ring-type heteroaryl such as pyrrolyl, imidazolyl, pyrazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, etc., and a fused ring-type heteroaryl such as benzoimidazolyl, isoindolyl
- substituted in the expression, “substituted or unsubstituted,” means that a hydrogen atom in a certain functional group is replaced with another atom or group, i.e. a substituent.
- triarylsilyl of X 1 to X 16 in formula 1 is preferably triphenylsilyl.
- the first host compound represented by formula 1 includes the following, but is not limited thereto.
- the second host compound represented by formula 2 includes the following, but is not limited thereto:
- the hole transport compound of formula 1 includes compounds H1-1 to H1-423, but is not limited thereto.
- the organic electroluminescent device of the present disclosure comprises an anode, a cathode, and an organic layer between the anode and the cathode, wherein the organic layer comprises one or more light-emitting layers and one or more hole transport layers; at least one of the one or more light-emitting layers comprises one or more dopant compounds and two or more host compounds; a first host compound of the host compounds is represented by formula 1; a second host compound is represented by formula 2; and at least one of the one or more hole transport layers comprises the compound represented by formula 1.
- the first host compound of formula 1 and the compound for the hole transport layer of formula 1 may be the same or different.
- the light-emitting layer indicates a layer from which light is emitted. It is preferable that a doping amount of the dopant compound is less than 20 wt% based on the total amount of the host compound and the dopant compound in a light-emitting layer.
- the weight ratio in the light-emitting layer between the first host material and the second host material may be in the range of 1:99 to 99:1, and specifically 30:70 to 70:30.
- the organic layer may comprise at least one layer selected from a hole injection layer, an electron transport layer, an electron injection layer, an electron buffering layer, an interlayer, a hole blocking layer, and an electron blocking layer.
- the dopant to be comprised in the organic electroluminescent device of the present disclosure is preferably at least one phosphorescent dopant.
- the phosphorescent dopant material for the organic electroluminescent device of the present disclosure is not limited, but may be preferably selected from metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu) or platinum (Pt), more preferably selected from ortho-metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu) or platinum (Pt), and even more preferably ortho-metallated iridium complex compounds.
- the phosphorescent dopant may be selected from the group consisting of compounds represented by the following formulae 101 to 103.
- L is selected from the following structures:
- R 100 represents hydrogen, a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C3-C30)cycloalkyl;
- R 101 to R 109 and R 111 to R 123 each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkoxy, or a substituted or unsubstituted (C3-C30)cycloalkyl;
- R 106 to R 109 may be linked to an adjacent substituent(s) to form a substituted or unsubstituted 3- to 30-membered, mono- or polycyclic, alicyclic or aromatic ring (for example, a substituted or unsubstituted fluorene, a substituted or unsubstituted dibenzothiophene, or a substituted or unsubstituted dibenzofuran);
- R 120 to R 123 each independently, may be linked to an adjacent substituent(s) to form a substituted or unsub
- R 124 to R 127 each independently, represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C6-C30)aryl; where R 124 , R 125 , R 126 , or R 127 is aryl, it may be linked to an adjacent substituent(s) to form a substituted or unsubstituted 3- to 30-membered, mono- or polycyclic, alicyclic or aromatic ring (for example, a substituted or unsubstituted fluorene, a substituted or unsubstituted dibenzothiophene, or a substituted or unsubstituted dibenzofuran);
- R 201 to R 211 each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with a halogen, a substituted or unsubstituted (C3-C30)cycloalkyl, or a substituted or unsubstituted (C6-C30)aryl;
- R 208 to R 211 each independently, may be linked to an adjacent substituent(s) to form a substituted or unsubstituted 3- to 30-membered, mono- or polycyclic, alicyclic or aromatic ring (for example, a substituted or unsubstituted fluorene, a substituted or unsubstituted dibenzothiophene, or a substituted or unsubstituted dibenzofuran);
- r and s each independently, represent an integer of 1 to 3; when r or s is an integer of 2 or more, each of R 100 may be the same or different; and e represents an integer of 1 to 3.
- the phosphorescent dopant material includes the following:
- the organic layer may further comprise at least one compound selected from the group consisting of arylamine-based compounds and styrylarylamine-based compounds.
- the organic layer may further comprise at least one metal selected from the group consisting of metals of Group 1, metals of Group 2, transition metals of the 4 th period, transition metals of the 5 th period, lanthanides and organic metals of the d-transition elements of the Periodic Table, or at least one complex compound comprising the metal.
- a surface layer may be placed on an inner surface(s) of one or both electrode(s), selected from a chalcogenide layer, a metal halide layer and a metal oxide layer.
- a chalcogenide (includes oxides) layer of silicon or aluminum is preferably placed on an anode surface of an electroluminescent medium layer
- a metal halide layer or a metal oxide layer is preferably placed on a cathode surface of an electroluminescent medium layer.
- the chalcogenide includes SiO X (1 ⁇ X ⁇ 2), AlO X (1 ⁇ X ⁇ 1.5), SiON, SiAlON, etc.;
- the metal halide includes LiF, MgF 2 , CaF 2 , a rare earth metal fluoride, etc.; and the metal oxide includes Cs 2 O, Li 2 O, MgO, SrO, BaO, CaO, etc.
- a hole injection layer In addition to the hole transport layer, a hole injection layer, an electron blocking layer, or a combination thereof may be disposed between the anode and the light-emitting layer.
- the hole injection layer may be composed of two or more layers in order to lower an energy barrier for injecting holes from the anode to a hole transport layer or an electron blocking layer (or a voltage for injecting a hole). Each of the layers may comprise two or more compounds.
- the electron blocking layer may be composed of two or more layers.
- An electron buffering layer, a hole blocking layer, an electron transport layer, an electron injection layer, or a combination thereof may be disposed between the light-emitting layer and the cathode.
- the electron buffering layer may be composed of two or more layers in order to control the electron injection and improve characteristics of interface between the light-emitting layer and the electron injection layer.
- Each of the layers may comprise two or more compounds.
- the hole blocking layer or electron transport layer may be composed of two or more layers, and each of the layers may comprise two or more compounds.
- a mixed region of an electron transport compound and a reductive dopant, or a mixed region of a hole transport compound and an oxidative dopant may be placed on at least one surface of a pair of electrodes.
- the electron transport compound is reduced to an anion, and thus it becomes easier to inject and transport electrons from the mixed region to an electroluminescent medium.
- the hole transport compound is oxidized to a cation, and thus it becomes easier to inject and transport holes from the mixed region to the electroluminescent medium.
- the oxidative dopant includes various Lewis acids and acceptor compounds
- the reductive dopant includes alkali metals, alkali metal compounds, alkaline earth metals, rare-earth metals, and mixtures thereof.
- a reductive dopant layer may be employed as a charge generating layer to prepare an electroluminescent device having two or more light-emitting layers and emitting white light.
- each layer of the organic electroluminescent device of the present disclosure dry film-forming methods such as vacuum evaporation, sputtering, plasma and ion plating methods, or wet film-forming methods such as inkjet printing, nozzle printing, slot coating, spin coating, dip coating, and flow coating methods can be used.
- dry film-forming methods such as vacuum evaporation, sputtering, plasma and ion plating methods, or wet film-forming methods such as inkjet printing, nozzle printing, slot coating, spin coating, dip coating, and flow coating methods can be used.
- wet film-forming methods such as inkjet printing, nozzle printing, slot coating, spin coating, dip coating, and flow coating methods.
- a thin film can be formed by dissolving or diffusing materials forming each layer into any suitable solvent such as ethanol, chloroform, tetrahydrofuran, dioxane, etc.
- the solvent can be any solvent where the materials forming each layer can be dissolved or diffused, and where there are no problems in film-formation capability.
- two or more host compounds for a light-emitting layer may be co-evaporated or mixture-evaporated.
- a co-evaporation indicates a process for two or more materials to be deposited as a mixture, by introducing each of the two or more materials into respective crucible cells, and applying electric current to the cells for each of the materials to be evaporated.
- a mixture-evaporation indicates a process for two or more materials to be deposited as a mixture, by mixing the two or more materials in one crucible cell before the deposition, and applying electric current to the cell for the mixture to be evaporated.
- the organic electroluminescent device of the present disclosure can be used for the manufacture of a display system or a lighting system.
- OLED organic electroluminescent device
- a transparent electrode indium tin oxide (ITO) thin film (10 ⁇ /sq) on a glass substrate for OLED (Geomatec) was subjected to an ultrasonic washing with acetone, ethanol, and distilled water sequentially, and was then stored in isopropanol.
- the ITO substrate was then mounted on a substrate holder of a vacuum vapor depositing apparatus.
- N 4 ,N 4' -diphenyl-N 4 ,N 4' -bis(9-phenyl-9H-carbazol-3-yl)-[1,1'-biphenyl]-4,4'-diamine (compound HI-1 ) was introduced into a cell of the vacuum vapor depositing apparatus, and then the pressure in the chamber of the apparatus was controlled to 10 -6 torr. Thereafter, an electric current was applied to the cell to evaporate HI-1 , thereby forming a first hole injection layer having a thickness of 80 nm on the ITO substrate.
- Dipyrazino[2,3-f:2',3'-h]quinoxalin-2,3,6,7,10,11-hexacarbonitrile (compound HI-2 ) was then introduced into another cell of the vacuum vapor depositing apparatus, and evaporated by applying electric current to the cell, thereby forming a second hole injection layer having a thickness of 3 nm on the first hole injection layer.
- N-([1,1'-biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine (compound HT-1 ) was introduced into one cell of the vacuum vapor depositing apparatus, and evaporated by applying electric current to the cell, thereby forming a first hole transport layer having a thickness of 10 nm on the second hole injection layer.
- a compound for a second hole transport layer shown in Table 1 below was then introduced into another cell of the vacuum vapor depositing apparatus, and evaporated by applying electric current to the cell, thereby forming a second hole transport layer having a thickness of 30 nm on the first hole transport layer.
- H1-34 and H2-31 were introduced into two cells of the vacuum vapor depositing apparatus, respectively.
- D-25 was introduced into another cell as a dopant.
- the two host compounds were evaporated at the same rate of 1:1, while the dopant was evaporated at a different rate from the host compounds, so that the dopant was deposited in a doping amount of 15 wt% based on the total amount of the host and dopant to form a light-emitting layer having a thickness of 40 nm on the hole transport layer.
- OLEDs were produced in the same manner as in Device Examples 1-1 to 1-3, except that HTL-A shown below was used as a compound for a second hole transport layer.
- a driving voltage at 1,000 nit, luminous efficiency, CIE color coordinate, and time taken to be reduced from 100% to 95% of the luminance at 15,000 nit and a constant current (T95 lifespan) of OLEDs were measured.
- the characteristics of the organic electroluminescent devices produced in device examples 1-1 to 1-3 and comparative example 1-1 are shown in Table 1 below.
- OLED was produced using the light-emitting material of the present disclosure as follows.
- a transparent electrode indium tin oxide (ITO) thin film (10 ⁇ /sq) on a glass substrate for an organic electroluminescent device (OLED) (Geomatec) was subjected to an ultrasonic washing with acetone, ethanol, and distilled water sequentially, and was then stored in isopropanol.
- the ITO substrate was then mounted on a substrate holder of a vacuum vapor depositing apparatus.
- N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)-benzidine (compound HI-2 ) was then introduced into another cell of the vacuum vapor depositing apparatus, and evaporated by applying electric current to the cell, thereby forming a second hole injection layer having a thickness of 95 nm on the first hole injection layer.
- a compound for a first hole transport layer shown in Table 2 below was introduced into one cell of the vacuum vapor depositing apparatus, and evaporated by applying electric current to the cell, thereby forming a first hole transport layer having a thickness of 20 nm on the second hole injection layer.
- H1-281 and H2-125 were introduced into two cells of the vacuum vapor depositing apparatus, respectively.
- D-122 was introduced into another cell as a dopant.
- the two host compounds were evaporated while the dopant was evaporated at a different rate from the host compounds, so that the dopant was deposited in a doping amount of 12 wt% based on the total amount of the host and dopant to form a light-emitting layer having a thickness of 30 nm on the hole transport layer.
- 2,4,6-tris(9,9-dimethyl-9H-fluoren-2-yl)-1,3,5-triazine (compound ET-1 ) was introduced into a cell of the vacuum vapor depositing apparatus, and evaporated to form an electron transport layer having a thickness of 35 nm on the light-emitting layer.
- lithium quinolate compound EI-1
- Al cathode having a thickness of 80 nm was then deposited by another vacuum vapor deposition apparatus on the electron injection layer.
- OLEDs were produced in the same manner as in Device Examples 2-1 to 2-5, except that H1-35 and H2-125 were used as a host, and the compound shown in Table 2 below was used for a first hole transport layer.
- OLED was produced in the same manner as in Device Examples 2-1 to 2-5, except that HTL-A shown below was used as a compound for a first hole transport layer.
- a driving voltage at a current density of 10 mA/cm 2 , luminous efficiency, CIE color coordinate, and time taken to be reduced from 100% to 98% of the luminance at 10,000 nit and a constant current (T98 lifespan) of OLEDs produced in device examples 2-1 to 2-10 and comparative example 2-1 are shown in Table 2 below.
- the organic electroluminescent device of the present disclosure has better lifespan characteristics than conventional devices by comprising a specific hole transport compound and a plurality of hosts.
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Abstract
The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device of the present disclosure shows high luminous efficiency and good lifespan by comprising a specific combination of the plural kinds of host compounds and a specific hole transport compound.
Description
The present disclosure relates to an organic electroluminescent device.
An electroluminescent (EL) device is a self-light-emitting device which has advantages in that it provides a wider viewing angle, a greater contrast ratio, and a faster response time. An organic EL device was first developed by Eastman Kodak, by using small aromatic diamine molecules and aluminum complexes as materials to form a light-emitting layer [Appl. Phys. Lett. 51, 913, 1987].
The organic EL device converts electric energy into light when electricity is applied to an organic light-emitting material(s). Generally, the organic EL device has a structure comprising an anode, a cathode, and an organic layer disposed between the anode and the cathode. The organic layer of the organic EL device comprises a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, an electron buffering layer, a hole blocking layer, an electron transport layer, an electron injection layer, etc. Depending on its function, materials for forming the organic layer can be classified as a hole injection material, a hole transport material, an electron blocking material, a light-emitting material, an electron buffering material, a hole blocking material, an electron transport material, an electron injection material, etc. When a voltage is applied to the organic EL device, holes and electrons are injected from an anode and a cathode, respectively, to the light-emitting layer. Excitons having high energy are formed by recombinations between the holes and the electrons. The energy of excitons puts the light-emitting organic compound in an excited state, and the decay of the excited state results in a relaxation of the energy level into a ground state, accompanied by light-emission.
The most important factor determining luminous efficiency in the organic EL device is light-emitting materials. The light-emitting material needs to have high quantum efficiency, high electron mobility, and high hole mobility. Furthermore, the light-emitting layer formed by the light-emitting material needs to be uniform and stable. Depending on colors visualized by light-emission, the light-emitting materials can be classified as a blue-, green-, or red-emitting material, and a yellow- or orange-emitting material can be additionally included therein. Depending on its function, the light-emitting materials can be classified as a host material and a dopant material. Recently, the development of an organic EL device providing high efficiency and long lifespan is an urgent issue. Particularly, considering EL characteristic requirements for a middle or large-sized panel of OLED, materials showing better characteristics than conventional ones must be urgently developed. The host material acts as a solvent in a solid state and transfers energy, and thus needs to have high purity and a molecular weight appropriate for vacuum deposition. Furthermore, the host material needs to have high glass transition temperature and high thermal degradation temperature to achieve thermal stability; high electro-chemical stability to achieve long lifespan; easiness of forming amorphous thin film; good adhesion to materials of adjacent layers; and non-migration to other layers.
In order to enhance color purity, luminous efficiency and stability, the light-emitting material may be used as a mixture of a host and a dopant. Generally, devices showing good electroluminescent characteristics have a structure comprising a light-emitting layer in which a dopant is doped into a host. In the dopant/host material system, efficiency and lifespan of the device are highly affected by the host material, and thus selection of the host material is important.
WO 2013/168688 A1, WO 2009/060757 A1, and Japanese Patent Application Laying-Open No. 2013-183036 A disclose an organic electroluminescent device employing a biscarbazole derivative as a host material. However, they fail to specifically disclose an organic electroluminescent device employing, as a plurality of host materials, a biscarbazole derivative in which the nitrogen atoms of the carbazoles are linked to aryls, respectively, and a carbazole derivative in which the nitrogen atom of the carbazole is linked to a nitrogen-containing heteroaryl, and as a hole transport material, a biscarbazole derivative in which the nitrogen atoms of the carbazoles are linked to aryls, respectively.
The object of the present disclosure is to provide an organic electroluminescent device showing high efficiency and long lifespan.
The present inventors found that the above object can be achieved by an organic electroluminescent device comprising an anode, a cathode, and an organic layer between the anode and the cathode, wherein the organic layer comprises one or more light-emitting layers and one or more hole transport layers; at least one of the one or more light-emitting layers comprises one or more dopant compounds and two or more host compounds; a first host compound of the host compounds is represented by the following formula 1; a second host compound is represented by the following formula 2; and at least one of the one or more hole transport layers comprises the compound represented by the following formula 1:
wherein
A1 and A2, each independently, represent a substituted or unsubstituted (C6-C30)aryl, provided that a nitrogen-containing heteroaryl is excluded from the substituent of A1 and A2;
L1 represents a single bond or a substituted or unsubstituted (C6-C30)arylene;
X1 to X16, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino; or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C3-C30), mono- or polycyclic, alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur;
wherein
Ma represents a substituted or unsubstituted nitrogen-containing 5- to 11-membered heteroaryl;
La represents a single bond, or a substituted or unsubstituted (C6-C30)arylene;
Xa to Xh, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino; or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C3-C30), mono- or polycyclic, alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur; and
the heteroaryl contains at least one hetero atom selected from B, N, O, S, Si, and P.
According to the present disclosure, an organic electroluminescent device having high efficiency and long lifespan is provided. In addition, the organic electroluminescent device of the present disclosure can be used for the manufacture of a display system or a lighting system.
Hereinafter, the present disclosure will be described in detail. However, the following description is intended to explain the invention, and is not meant in any way to restrict the scope of the invention.
The details of the organic electroluminescent device of the present disclosure are as follows.
According to one embodiment of the organic electroluminescent device of the present disclosure, the compound of formula 1 may be represented by any one of the following formulae 3, 4, 5, and 6.
wherein A1, A2, L1 and X1 to X16 are as defined in formula 1 above.
In formula 1, A1 and A2, each independently, represent a substituted or unsubstituted (C6-C30)aryl. A1 and A2, each independently, may represent preferably, a substituted or unsubstituted (C6-C18)aryl; and more preferably, a (C6-C18)aryl unsubstituted or substituted with a cyano, a halogen, a (C1-C6)alkyl, a (C6-C12)aryl, or a tri(C6-C12)arylsilyl. Specifically, A1 and A2, each independently, may be selected from the group consisting of a substituted or unsubstituted phenyl, a substituted or unsubstituted biphenyl, a substituted or unsubstituted terphenyl, a substituted or unsubstituted naphthyl, a substituted or unsubstituted fluorenyl, a substituted or unsubstituted benzofluorenyl, a substituted or unsubstituted phenanthrenyl, a substituted or unsubstituted anthracenyl, a substituted or unsubstituted indenyl, a substituted or unsubstituted triphenylenyl, a substituted or unsubstituted pyrenyl, a substituted or unsubstituted tetracenyl, a substituted or unsubstituted perylenyl, a substituted or unsubstituted chrysenyl, a substituted or unsubstituted phenylnaphthyl, a substituted or unsubstituted naphthylphenyl, and a substituted or unsubstituted fluoranthenyl. Herein, the substituents of the substituted phenyl, etc., may be a cyano, a halogen, a (C1-C6)alkyl, a (C6-C12)aryl, or a tri(C6-C12)arylsilyl.
In formula 1, X1 to X16, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino, or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C3-C30), mono- or polycyclic, alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur. Preferably, X1 to X16. each independently, may represent hydrogen, a cyano, a substituted or unsubstituted (C1-C10)alkyl, a substituted or unsubstituted (C6-C20)aryl, a substituted or unsubstituted 5- to 20-membered heteroaryl, or a substituted or unsubstituted tri(C6-C12)arylsilyl. More preferably, X1 to X16. each independently, may represent hydrogen; a cyano; a (C1-C10)alkyl; a (C6-C20)aryl unsubstituted or substituted with a cyano, a (C1-C10)alkyl, or a tri(C6-C12)arylsilyl; a 5- to 20-membered heteroaryl unsubstituted or substituted with a (C1-C10)alkyl, a (C6-C15)aryl or a tri(C6-C12)arylsilyl; or a tri(C6-C12)arylsilyl unsubstituted or substituted with a (C1-C10)alkyl. Specifically, X1 to X16. each independently, may represent hydrogen; a cyano; a (C1-C6)alkyl; phenyl, biphenyl, terphenyl, or naphthyl, unsubstituted or substituted with a cyano, a (C1-C6)alkyl or triphenylsilyl; dibenzothiophene or dibenzofuran, unsubstituted or substituted with a (C1-C6)alkyl, phenyl, biphenyl, naphthyl, or triphenylsilyl; or triphenylsilyl unsubstituted or substituted with a (C1-C6)alkyl.
In formula 1, L1 represents a single bond, or a substituted or unsubstituted (C6-C30)arylene. Preferably, L1 may represent a single bond, or a substituted or unsubstituted (C6-C15)arylene.
L1 may represent a single bond, or one selected from the following formulae 7 to 19.
wherein
Xi to Xp, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino; or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C3-C30), mono- or polycyclic, alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur; and 
represents a bonding site to a mother nucleus.
Xi to Xp, each independently, may represent preferably, hydrogen, a halogen, a cyano, a (C1-C10)alkyl, a (C3-C20)cycloalkyl, a (C6-C12)aryl, a (C1-C6)alkyldi(C6-C12)arylsilyl, or a tri(C6-C12)arylsilyl; and more preferably, hydrogen, a cyano, a (C1-C6)alkyl, or a tri(C6-C12)arylsilyl.
In formula 2, Ma represents a substituted or unsubstituted nitrogen-containing 5- to 11-membered heteroaryl. Ma may represent preferably, a substituted or unsubstituted nitrogen-containing 6- to 10-membered heteroaryl; and more preferably, a nitrogen-containing 6- to 10-membered heteroaryl substituted with an unsubstituted (C6-C18)aryl, a (C6-C12)aryl substituted with a cyano, a (C6-C12)aryl substituted with a (C1-C6)alkyl, a (C6-C12)aryl substituted with a tri(C6-C12)arylsilyl, or a 6- to 15-membered heteroaryl.
Specifically, Ma may represent a substituted or unsubstituted monocyclic ring-type heteroaryl selected from the group consisting of a substituted or unsubstituted pyrrolyl, a substituted or unsubstituted imidazolyl, a substituted or unsubstituted pyrazolyl, a substituted or unsubstituted triazinyl, a substituted or unsubstituted tetrazinyl, a substituted or unsubstituted triazolyl, a substituted or unsubstituted tetrazolyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted pyrazinyl, a substituted or unsubstituted pyrimidinyl, and a substituted or unsubstituted pyridazinyl, or a substituted or unsubstituted fused ring-type heteroaryl selected from the group consisting of a substituted or unsubstituted benzimidazolyl, a substituted or unsubstituted isoindolyl, a substituted or unsubstituted indolyl, a substituted or unsubstituted indazolyl, a substituted or unsubstituted benzothiadiazolyl, a substituted or unsubstituted quinolyl, a substituted or unsubstituted isoquinolyl, a substituted or unsubstituted cinnolinyl, a substituted or unsubstituted quinazolinyl, a substituted or unsubstituted naphthyridinyl, and a substituted or unsubstituted quinoxalinyl. Preferably, Ma may represent a substituted or unsubstituted triazinyl, a substituted or unsubstituted pyrimidinyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted quinolyl, a substituted or unsubstituted isoquinolyl, a substituted or unsubstituted quinazolinyl, a substituted or unsubstituted naphthyridinyl, or a substituted or unsubstituted quinoxalinyl. The substituents for the substituted pyrrolyl, etc., of Ma may be a (C6-C18)aryl, a (C6-C12)aryl substituted with a cyano, a (C6-C12)aryl substituted with a (C1-C6)alkyl, a (C6-C12)aryl substituted with a tri(C6-C12)arylsilyl, a cyano, a (C1-C6)alkyl, a tri(C6-C12)arylsilyl, or a 6- to 15-membered heteroaryl; and specifically, phenyl, biphenyl, terphenyl, naphthyl, phenylnaphthyl, naphthylphenyl, phenanthrenyl, anthracenyl, dibenzothiophenyl, or dibenzofuranyl, unsubstituted or substituted with a cyano, a (C1-C6)alkyl, or triphenylsilyl.
In formula 2, La represents a single bond, or a substituted or unsubstituted (C6-C30)arylene; and preferably, a single bond, or a substituted or unsubstituted (C6-C12)arylene. Specifically, La may represent a single bond, or any one of formulae 7 to 19.
In formula 2, Xa to Xh, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino, or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C3-C30), mono- or polycyclic, alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur. Preferably, Xa to Xh, each independently, may represent hydrogen, a cyano, a substituted or unsubstituted (C6-C15)aryl, a substituted or unsubstituted 10- to 20-membered heteroaryl, or a substituted or unsubstituted tri(C6-C10)arylsilyl, or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C6-C20) , mono- or polycyclic, aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur. More preferably, Xa to Xh, each independently, may represent hydrogen, a cyano, a (C6-C15)aryl unsubstituted or substituted with a tri(C6-C10)arylsily, or a 10- to 20-membered heteroaryl unsubstituted or substituted with a (C6-C12)aryl, or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted benzene, a substituted or unsubstituted indole, a substituted or unsubstituted benzindole, a substituted or unsubstituted indene, a substituted or unsubstituted benzofuran, or a substituted or unsubstituted benzothiophene.
Herein, “(C1-C30)alkyl” indicates a linear or branched alkyl having 1 to 30, preferably 1 to 20, and more preferably 1 to 10 carbon atoms, and includes methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, etc. “(C2-C30) alkenyl” indicates a linear or branched alkenyl having 2 to 30, preferably 2 to 20, and more preferably 2 to 10 carbon atoms and includes vinyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methylbut-2-enyl, etc. “(C2-C30)alkynyl” indicates a linear or branched alkynyl having 2 to 30, preferably 2 to 20, and more preferably 2 to 10 carbon atoms and includes ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methylpent-2-ynyl, etc. “(C3-C30)cycloalkyl” indicates a mono- or polycyclic hydrocarbon having 3 to 30, preferably 3 to 20, and more preferably 3 to 7 ring backbone carbon atoms and includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc. “3- to 7-membered heterocycloalkyl” indicates a cycloalkyl having 3 to 7, preferably 5 to 7 ring backbone atoms including at least one hetero atom selected from B, N, O, S, Si, and P, preferably O, S, and N, and includes tetrahydrofuran, pyrrolidine, thiolan, tetrahydropyran, Furthermore, “(C6-C30)aryl(ene)” indicates a monocyclic or fused ring-based radical derived from an aromatic hydrocarbon and having 6 to 30, preferably 6 to 20, and more preferably 6 to 15 ring backbone carbon atoms, and includes phenyl, biphenyl, terphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, fluorenyl, phenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthrenyl, phenylphenanthrenyl, anthracenyl, indenyl, triphenylenyl, pyrenyl, tetracenyl, perylenyl, chrysenyl, naphthacenyl, fluoranthenyl, etc. “3- to 30-membered heteroaryl” indicates an aryl group having 3 to 30 ring backbone atoms including at least one, preferably 1 to 4, hetero atom selected from the group consisting of B, N, O, S, Si, and P; may be a monocyclic ring, or a fused ring condensed with at least one benzene ring; may be partially saturated; may be one formed by linking at least one heteroaryl or aryl group to a heteroaryl group via a single bond(s); and includes a monocyclic ring-type heteroaryl such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, etc., and a fused ring-type heteroaryl such as benzofuranyl, benzothiophenyl, isobenzofuranyl, dibenzofuranyl, dibenzothiophenyl, benzoimidazolyl, benzothiazolyl, benzoisothiazolyl, benzoisoxazolyl, benzoxazolyl, isoindolyl, indolyl, benzindolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, quinoxalinyl, carbazolyl, phenoxazinyl, phenanthridinyl, benzodioxolyl, etc. The “nitrogen-containing 5- to 30-membered heteroaryl” indicates a heteroaryl group having 5 to 30, preferably 5 to 20, and more preferably 5 to 15 ring backbone atoms including at least one, preferably 1 to 4, nitrogen as the hetero atom; may be a monocyclic ring, or a fused ring condensed with at least one benzene ring; may be partially saturated; may be one formed by linking at least one heteroaryl or aryl group to a heteroaryl group via a single bond(s); and includes a monocyclic ring-type heteroaryl such as pyrrolyl, imidazolyl, pyrazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, etc., and a fused ring-type heteroaryl such as benzoimidazolyl, isoindolyl, indolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, quinoxalinyl, carbazolyl, phenanthridinyl, etc. Furthermore, “halogen” includes F, Cl, Br, and I.
Herein, “substituted” in the expression, “substituted or unsubstituted,” means that a hydrogen atom in a certain functional group is replaced with another atom or group, i.e. a substituent. In the present disclosure, the substituents of the substituted alkyl, the substituted alkenyl, the substituted alkynyl, the substituted cycloalkyl, the substituted aryl(ene), the substituted heteroaryl, the substituted trialkylsilyl, the substituted arylsilyl, the substituted dialkylarylsilyl, the substituted mono- or di-arylamino, and the substituted nitrogen-containing heteroaryl of A1, A2, L1, X1 to X16, Ma, La and Xa to Xh in formulae 1 and 2, each independently, are at least one selected from the group consisting of deuterium, a halogen, a cyano, a carboxy, a nitro, a hydroxy, a (C1-C30)alkyl, a halo(C1-C30)alkyl, a (C2-C30)alkenyl, a (C2-C30)alkynyl, a (C1-C30)alkoxy, a (C1-C30)alkylthio, a (C3-C30)cycloalkyl, a (C3-C30)cycloalkenyl, a 3- to 7-membered heterocycloalkyl, a (C6-C30)aryloxy, a (C6-C30)arylthio, a 3- to 30-membered heteroaryl unsubstituted or substituted with a (C6-C30)aryl, a (C6-C30)aryl unsubstituted or substituted with a cyano, a 3- to 30-membered heteroaryl, or a tri(C6-C30)arylsilyl, a tri(C1-C30)alkylsilyl, a tri(C6-C30)arylsilyl, a di(C1-C30)alkyl(C6-C30)arylsilyl, a (C1-C30)alkyldi(C6-C30)arylsilyl, an amino, a mono- or di-(C1-C30)alkylamino, a mono- or di-(C6-C30)arylamino, a (C1-C30)alkyl(C6-C30)arylamino, a (C1-C30)alkylcarbonyl, a (C1-C30)alkoxycarbonyl, a (C6-C30)arylcarbonyl, a di(C6-C30)arylboronyl, a di(C1-C30)alkylboronyl, a (C1-C30)alkyl(C6-C30)arylboronyl, a (C6-C30)aryl(C1-C30)alkyl, and a (C1-C30)alkyl(C6-C30)aryl; and preferably a cyano, a (C1-C6)alkyl, a 5- to 15-membered heteroaryl, a (C6-C18)aryl unsubstituted or substituted with a cyano or a tri(C6-C12)arylsilyl, a tri(C6-C12)arylsilyl, and a (C1-C6)alkyl(C6-C12)aryl.
In formula 1, triarylsilyl of X1 to X16 in formula 1 is preferably triphenylsilyl.
The first host compound represented by formula 1 includes the following, but is not limited thereto.
The second host compound represented by formula 2 includes the following, but is not limited thereto:
The hole transport compound of formula 1 includes compounds H1-1 to H1-423, but is not limited thereto.
The organic electroluminescent device of the present disclosure comprises an anode, a cathode, and an organic layer between the anode and the cathode, wherein the organic layer comprises one or more light-emitting layers and one or more hole transport layers; at least one of the one or more light-emitting layers comprises one or more dopant compounds and two or more host compounds; a first host compound of the host compounds is represented by formula 1; a second host compound is represented by formula 2; and at least one of the one or more hole transport layers comprises the compound represented by formula 1. The first host compound of formula 1 and the compound for the hole transport layer of formula 1 may be the same or different.
The light-emitting layer indicates a layer from which light is emitted. It is preferable that a doping amount of the dopant compound is less than 20 wt% based on the total amount of the host compound and the dopant compound in a light-emitting layer. In the organic electroluminescent device of the present disclosure, the weight ratio in the light-emitting layer between the first host material and the second host material may be in the range of 1:99 to 99:1, and specifically 30:70 to 70:30.
In addition to the light-emitting layer and the hole transport layer, the organic layer may comprise at least one layer selected from a hole injection layer, an electron transport layer, an electron injection layer, an electron buffering layer, an interlayer, a hole blocking layer, and an electron blocking layer.
The dopant to be comprised in the organic electroluminescent device of the present disclosure is preferably at least one phosphorescent dopant. The phosphorescent dopant material for the organic electroluminescent device of the present disclosure is not limited, but may be preferably selected from metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu) or platinum (Pt), more preferably selected from ortho-metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu) or platinum (Pt), and even more preferably ortho-metallated iridium complex compounds.
Preferably, the phosphorescent dopant may be selected from the group consisting of compounds represented by the following formulae 101 to 103.
wherein L is selected from the following structures:
R100 represents hydrogen, a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C3-C30)cycloalkyl;
R101 to R109 and R111 to R123, each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkoxy, or a substituted or unsubstituted (C3-C30)cycloalkyl; R106 to R109 may be linked to an adjacent substituent(s) to form a substituted or unsubstituted 3- to 30-membered, mono- or polycyclic, alicyclic or aromatic ring (for example, a substituted or unsubstituted fluorene, a substituted or unsubstituted dibenzothiophene, or a substituted or unsubstituted dibenzofuran); R120 to R123, each independently, may be linked to an adjacent substituent(s) to form a substituted or unsubstituted 3- to 30-membered, mono- or polycyclic, alicyclic or aromatic ring (for example, a substituted or unsubstituted quinoline);
R124 to R127, each independently, represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C6-C30)aryl; where R124, R125, R126, or R127 is aryl, it may be linked to an adjacent substituent(s) to form a substituted or unsubstituted 3- to 30-membered, mono- or polycyclic, alicyclic or aromatic ring (for example, a substituted or unsubstituted fluorene, a substituted or unsubstituted dibenzothiophene, or a substituted or unsubstituted dibenzofuran);
R201 to R211, each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with a halogen, a substituted or unsubstituted (C3-C30)cycloalkyl, or a substituted or unsubstituted (C6-C30)aryl; R208 to R211, each independently, may be linked to an adjacent substituent(s) to form a substituted or unsubstituted 3- to 30-membered, mono- or polycyclic, alicyclic or aromatic ring (for example, a substituted or unsubstituted fluorene, a substituted or unsubstituted dibenzothiophene, or a substituted or unsubstituted dibenzofuran);
r and s, each independently, represent an integer of 1 to 3; when r or s is an integer of 2 or more, each of R100 may be the same or different; and e represents an integer of 1 to 3.
Specifically, the phosphorescent dopant material includes the following:
In the organic electroluminescent device of the present disclosure, the organic layer may further comprise at least one compound selected from the group consisting of arylamine-based compounds and styrylarylamine-based compounds.
In the organic electroluminescent device of the present disclosure, the organic layer may further comprise at least one metal selected from the group consisting of metals of Group 1, metals of Group 2, transition metals of the 4th period, transition metals of the 5th period, lanthanides and organic metals of the d-transition elements of the Periodic Table, or at least one complex compound comprising the metal.
In the organic electroluminescent device of the present disclosure, preferably, at least one layer (hereinafter, "a surface layer”) may be placed on an inner surface(s) of one or both electrode(s), selected from a chalcogenide layer, a metal halide layer and a metal oxide layer. Specifically, a chalcogenide (includes oxides) layer of silicon or aluminum is preferably placed on an anode surface of an electroluminescent medium layer, and a metal halide layer or a metal oxide layer is preferably placed on a cathode surface of an electroluminescent medium layer. Such a surface layer provides operation stability for the organic electroluminescent device. Preferably, the chalcogenide includes SiOX (1≤X≤2), AlOX (1≤X≤1.5), SiON, SiAlON, etc.; the metal halide includes LiF, MgF2, CaF2, a rare earth metal fluoride, etc.; and the metal oxide includes Cs2O, Li2O, MgO, SrO, BaO, CaO, etc.
In addition to the hole transport layer, a hole injection layer, an electron blocking layer, or a combination thereof may be disposed between the anode and the light-emitting layer. The hole injection layer may be composed of two or more layers in order to lower an energy barrier for injecting holes from the anode to a hole transport layer or an electron blocking layer (or a voltage for injecting a hole). Each of the layers may comprise two or more compounds. The electron blocking layer may be composed of two or more layers.
An electron buffering layer, a hole blocking layer, an electron transport layer, an electron injection layer, or a combination thereof may be disposed between the light-emitting layer and the cathode. The electron buffering layer may be composed of two or more layers in order to control the electron injection and improve characteristics of interface between the light-emitting layer and the electron injection layer. Each of the layers may comprise two or more compounds. The hole blocking layer or electron transport layer may be composed of two or more layers, and each of the layers may comprise two or more compounds.
In the organic electroluminescent device of the present disclosure, a mixed region of an electron transport compound and a reductive dopant, or a mixed region of a hole transport compound and an oxidative dopant may be placed on at least one surface of a pair of electrodes. In this case, the electron transport compound is reduced to an anion, and thus it becomes easier to inject and transport electrons from the mixed region to an electroluminescent medium. Furthermore, the hole transport compound is oxidized to a cation, and thus it becomes easier to inject and transport holes from the mixed region to the electroluminescent medium. Preferably, the oxidative dopant includes various Lewis acids and acceptor compounds, and the reductive dopant includes alkali metals, alkali metal compounds, alkaline earth metals, rare-earth metals, and mixtures thereof. A reductive dopant layer may be employed as a charge generating layer to prepare an electroluminescent device having two or more light-emitting layers and emitting white light.
In order to form each layer of the organic electroluminescent device of the present disclosure, dry film-forming methods such as vacuum evaporation, sputtering, plasma and ion plating methods, or wet film-forming methods such as inkjet printing, nozzle printing, slot coating, spin coating, dip coating, and flow coating methods can be used. Where a layer is formed with the first host compound and the second host compound of the present disclosure, they may be co-evaporated or mixture-evaporated.
When using a wet film-forming method, a thin film can be formed by dissolving or diffusing materials forming each layer into any suitable solvent such as ethanol, chloroform, tetrahydrofuran, dioxane, etc. The solvent can be any solvent where the materials forming each layer can be dissolved or diffused, and where there are no problems in film-formation capability.
In the organic electroluminescent device of the present disclosure, two or more host compounds for a light-emitting layer may be co-evaporated or mixture-evaporated. Herein, a co-evaporation indicates a process for two or more materials to be deposited as a mixture, by introducing each of the two or more materials into respective crucible cells, and applying electric current to the cells for each of the materials to be evaporated. Herein, a mixture-evaporation indicates a process for two or more materials to be deposited as a mixture, by mixing the two or more materials in one crucible cell before the deposition, and applying electric current to the cell for the mixture to be evaporated.
The organic electroluminescent device of the present disclosure can be used for the manufacture of a display system or a lighting system.
Hereinafter, the preparation method of the device comprising the host compounds and the hole transport compound of the present disclosure, and its luminescent properties will be explained in detail with reference to the following examples.
[Device Examples 1-1 to 1-3] OLED produced by an evaporation of a hole
transport compound of the present disclosure, and a co-evaporation of a first host compound and a second host compound of the present disclosure
An organic electroluminescent device (OLED) was produced using the light-emitting material of the present disclosure as follows. A transparent electrode indium tin oxide (ITO) thin film (10 Ω/sq) on a glass substrate for OLED (Geomatec) was subjected to an ultrasonic washing with acetone, ethanol, and distilled water sequentially, and was then stored in isopropanol. The ITO substrate was then mounted on a substrate holder of a vacuum vapor depositing apparatus. N4,N4'-diphenyl-N4,N4'-bis(9-phenyl-9H-carbazol-3-yl)-[1,1'-biphenyl]-4,4'-diamine (compound HI-1) was introduced into a cell of the vacuum vapor depositing apparatus, and then the pressure in the chamber of the apparatus was controlled to 10-6 torr. Thereafter, an electric current was applied to the cell to evaporate HI-1, thereby forming a first hole injection layer having a thickness of 80 nm on the ITO substrate. Dipyrazino[2,3-f:2',3'-h]quinoxalin-2,3,6,7,10,11-hexacarbonitrile (compound HI-2) was then introduced into another cell of the vacuum vapor depositing apparatus, and evaporated by applying electric current to the cell, thereby forming a second hole injection layer having a thickness of 3 nm on the first hole injection layer. N-([1,1'-biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine (compound HT-1) was introduced into one cell of the vacuum vapor depositing apparatus, and evaporated by applying electric current to the cell, thereby forming a first hole transport layer having a thickness of 10 nm on the second hole injection layer. A compound for a second hole transport layer shown in Table 1 below was then introduced into another cell of the vacuum vapor depositing apparatus, and evaporated by applying electric current to the cell, thereby forming a second hole transport layer having a thickness of 30 nm on the first hole transport layer. As a host material, H1-34 and H2-31 were introduced into two cells of the vacuum vapor depositing apparatus, respectively. D-25 was introduced into another cell as a dopant. The two host compounds were evaporated at the same rate of 1:1, while the dopant was evaporated at a different rate from the host compounds, so that the dopant was deposited in a doping amount of 15 wt% based on the total amount of the host and dopant to form a light-emitting layer having a thickness of 40 nm on the hole transport layer. 2,4-bis(9,9-dimethyl-9H-fluoren-2-yl)-6-(naphthalen-2-yl)-1,3,5-triazine (compound ET-1) and lithium quinolate (compound EI-1) were introduced into two cells of the vacuum vapor depositing apparatus, respectively, and evaporated at the same rate of 4:6, thereby forming an electron transport layer having a thickness of 35 nm on the light-emitting layer. After depositing lithium quinolate (compound EI-1) as an electron injection layer having a thickness of 2 nm on the electron transport layer, an Al cathode having a thickness of 80 nm was then deposited by another vacuum vapor deposition apparatus on the electron injection layer.
[Comparative Example 1-1] OLED produced by an evaporation of HTL-A as a
compound for a second hole transport layer
OLEDs were produced in the same manner as in Device Examples 1-1 to 1-3, except that HTL-A shown below was used as a compound for a second hole transport layer.
A driving voltage at 1,000 nit, luminous efficiency, CIE color coordinate, and time taken to be reduced from 100% to 95% of the luminance at 15,000 nit and a constant current (T95 lifespan) of OLEDs were measured. The characteristics of the organic electroluminescent devices produced in device examples 1-1 to 1-3 and comparative example 1-1 are shown in Table 1 below.
[Device Examples 2-1 to 2-5] OLED produced by an evaporation of a hole
transport compound of the present disclosure, and a co-evaporation of a first host compound and a second host compound of the present disclosure
OLED was produced using the light-emitting material of the present disclosure as follows. A transparent electrode indium tin oxide (ITO) thin film (10 Ω/sq) on a glass substrate for an organic electroluminescent device (OLED) (Geomatec) was subjected to an ultrasonic washing with acetone, ethanol, and distilled water sequentially, and was then stored in isopropanol. The ITO substrate was then mounted on a substrate holder of a vacuum vapor depositing apparatus. Dipyrazino[2,3-f:2',3'-h]quinoxalin-2,3,6,7,10,11-hexacarbonitrile (compound HI-1) was introduced into a cell of the vacuum vapor depositing apparatus, and then the pressure in the chamber of the apparatus was controlled to 10-6 torr. Thereafter, an electric current was applied to the cell to evaporate HI-1, thereby forming a first hole injection layer having a thickness of 5 nm on the ITO substrate. N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)-benzidine (compound HI-2) was then introduced into another cell of the vacuum vapor depositing apparatus, and evaporated by applying electric current to the cell, thereby forming a second hole injection layer having a thickness of 95 nm on the first hole injection layer. A compound for a first hole transport layer shown in Table 2 below was introduced into one cell of the vacuum vapor depositing apparatus, and evaporated by applying electric current to the cell, thereby forming a first hole transport layer having a thickness of 20 nm on the second hole injection layer. As a host material, H1-281 and H2-125 were introduced into two cells of the vacuum vapor depositing apparatus, respectively. D-122 was introduced into another cell as a dopant. The two host compounds were evaporated while the dopant was evaporated at a different rate from the host compounds, so that the dopant was deposited in a doping amount of 12 wt% based on the total amount of the host and dopant to form a light-emitting layer having a thickness of 30 nm on the hole transport layer. 2,4,6-tris(9,9-dimethyl-9H-fluoren-2-yl)-1,3,5-triazine (compound ET-1) was introduced into a cell of the vacuum vapor depositing apparatus, and evaporated to form an electron transport layer having a thickness of 35 nm on the light-emitting layer. After depositing lithium quinolate (compound EI-1) as an electron injection layer having a thickness of 2 nm on the electron transport layer, an Al cathode having a thickness of 80 nm was then deposited by another vacuum vapor deposition apparatus on the electron injection layer.
[Device Examples 2-6 to 2-10] OLED produced by an evaporation of a hole
transport compound of the present disclosure, and a co-evaporation of a first host compound and a second host compound of the present disclosure
OLEDs were produced in the same manner as in Device Examples 2-1 to 2-5, except that H1-35 and H2-125 were used as a host, and the compound shown in Table 2 below was used for a first hole transport layer.
[Comparative Example 2-1] OLED produced by an evaporation of HTL-A as a
compound for a first hole transport layer
OLED was produced in the same manner as in Device Examples 2-1 to 2-5, except that HTL-A shown below was used as a compound for a first hole transport layer.
A driving voltage at a current density of 10 mA/cm2, luminous efficiency, CIE color coordinate, and time taken to be reduced from 100% to 98% of the luminance at 10,000 nit and a constant current (T98 lifespan) of OLEDs produced in device examples 2-1 to 2-10 and comparative example 2-1 are shown in Table 2 below.
As confirmed in the Device Examples above, the organic electroluminescent device of the present disclosure has better lifespan characteristics than conventional devices by comprising a specific hole transport compound and a plurality of hosts.
Claims (8)
- An organic electroluminescent device comprising an anode, a cathode, and an organic layer between the anode and the cathode, wherein the organic layer comprises one or more light-emitting layers and one or more hole transport layers; at least one of the one or more light-emitting layers comprises one or more dopant compounds and two or more host compounds; a first host compound of the host compounds is represented by the following formula 1; a second host compound is represented by the following formula 2; and at least one of the one or more hole transport layers comprises the compound represented by the following formula 1:
whereinA1 and A2, each independently, represent a substituted or unsubstituted (C6-C30)aryl, provided that a nitrogen-containing heteroaryl is excluded from the substituent of A1 and A2;L1 represents a single bond or a substituted or unsubstituted (C6-C30)arylene;X1 to X16, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino; or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C3-C30), mono- or polycyclic, alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur;
whereinMa represents a substituted or unsubstituted nitrogen-containing 5- to 11-membered heteroaryl;La represents a single bond, or a substituted or unsubstituted (C6-C30)arylene;Xa to Xh, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino; or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C3-C30), mono- or polycyclic, alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur; andthe heteroaryl contains at least one hetero atom selected from B, N, O, S, Si, and P. - The organic electroluminescent device according to claim 1, wherein in formula 1, A1 and A2, each independently, are selected from the group consisting of a substituted or unsubstituted phenyl, a substituted or unsubstituted biphenyl, a substituted or unsubstituted terphenyl, a substituted or unsubstituted naphthyl, a substituted or unsubstituted fluorenyl, a substituted or unsubstituted benzofluorenyl, a substituted or unsubstituted phenanthrenyl, a substituted or unsubstituted anthracenyl, a substituted or unsubstituted indenyl, a substituted or unsubstituted triphenylenyl, a substituted or unsubstituted pyrenyl, a substituted or unsubstituted tetracenyl, a substituted or unsubstituted perylenyl, a substituted or unsubstituted chrysenyl, a substituted or unsubstituted phenylnaphthyl, a substituted or unsubstituted naphthylphenyl, and a substituted or unsubstituted fluoranthenyl.
- The organic electroluminescent device according to claim 1, wherein in formula 1, L1 represents a single bond, or one selected from the following formulae 7 to 19.
whereinXi to Xp, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino; or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C3-C30), mono- or polycyclic, alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur; andrepresents a bonding site to a mother nucleus.
- The organic electroluminescent device according to claim 1, wherein in formula 2, Ma represents a substituted or unsubstituted monocyclic ring-type heteroaryl selected from the group consisting of a substituted or unsubstituted pyrrolyl, a substituted or unsubstituted imidazolyl, a substituted or unsubstituted pyrazolyl, a substituted or unsubstituted triazinyl, a substituted or unsubstituted tetrazinyl, a substituted or unsubstituted triazolyl, a substituted or unsubstituted tetrazolyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted pyrazinyl, a substituted or unsubstituted pyrimidinyl, and a substituted or unsubstituted pyridazinyl, or a substituted or unsubstituted fused ring-type heteroaryl selected from the group consisting of a substituted or unsubstituted benzimidazolyl, a substituted or unsubstituted isoindolyl, a substituted or unsubstituted indolyl, a substituted or unsubstituted indazolyl, a substituted or unsubstituted benzothiadiazolyl, a substituted or unsubstituted quinolyl, a substituted or unsubstituted isoquinolyl, a substituted or unsubstituted cinnolinyl, a substituted or unsubstituted quinazolinyl, a substituted or unsubstituted naphthyridinyl, and a substituted or unsubstituted quinoxalinyl.
- The organic electroluminescent device according to claim 1, wherein in formula 2, La represents a single bond, or one selected from the following formulae 7 to 19.
whereinXi to Xp, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino; or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted (C3-C30), mono- or polycyclic, alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur; andrepresents a bonding site to a mother nucleus.
- The organic electroluminescent device according to claim 1, wherein in formula 2, Xa to Xh, each independently, represent hydrogen, a cyano, a (C6-C15)aryl unsubstituted or substituted with a tri(C6-C10)arylsilyl, or a 10- to 20-membered heteroaryl unsubstituted or substituted with a (C6-C12)aryl; or may be linked to an adjacent substituent(s) to form a substituted or unsubstituted benzene, a substituted or unsubstituted indole, a substituted or unsubstituted benzindole, a substituted or unsubstituted indene, a substituted or unsubstituted benzofuran, or a substituted or unsubstituted benzothiophene.
- The organic electroluminescent device according to claim 1, wherein the compound of formula 1 is selected from the group consisting of:
- The organic electroluminescent device according to claim 1, wherein the compound of formula 2 is selected from the group consisting of:
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP15821623.4A EP3170206B1 (en) | 2014-07-18 | 2015-07-17 | Organic electroluminescent device |
| US15/327,204 US20170170408A1 (en) | 2014-07-18 | 2015-07-17 | Organic electroluminescent device |
| CN201580038744.5A CN106575663B (en) | 2014-07-18 | 2015-07-17 | Organnic electroluminescent device |
| JP2017523753A JP6687613B2 (en) | 2014-07-18 | 2015-07-17 | Organic electroluminescent device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20140091068 | 2014-07-18 | ||
| KR10-2014-0091068 | 2014-07-18 |
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| Publication Number | Publication Date |
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| WO2016010402A1 true WO2016010402A1 (en) | 2016-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2015/007462 WO2016010402A1 (en) | 2014-07-18 | 2015-07-17 | Organic electroluminescent device |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20170170408A1 (en) |
| EP (1) | EP3170206B1 (en) |
| JP (1) | JP6687613B2 (en) |
| KR (1) | KR102527426B1 (en) |
| CN (1) | CN106575663B (en) |
| WO (1) | WO2016010402A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3170206A4 (en) | 2018-03-14 |
| KR20160010373A (en) | 2016-01-27 |
| CN106575663A (en) | 2017-04-19 |
| KR102527426B1 (en) | 2023-05-03 |
| US20170170408A1 (en) | 2017-06-15 |
| CN106575663B (en) | 2019-05-03 |
| JP2017527129A (en) | 2017-09-14 |
| JP6687613B2 (en) | 2020-04-22 |
| EP3170206A1 (en) | 2017-05-24 |
| EP3170206B1 (en) | 2023-03-15 |
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