WO2013187258A1 - 発光素子材料および発光素子 - Google Patents
発光素子材料および発光素子 Download PDFInfo
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- WO2013187258A1 WO2013187258A1 PCT/JP2013/065213 JP2013065213W WO2013187258A1 WO 2013187258 A1 WO2013187258 A1 WO 2013187258A1 JP 2013065213 W JP2013065213 W JP 2013065213W WO 2013187258 A1 WO2013187258 A1 WO 2013187258A1
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- 239000000463 material Substances 0.000 title claims abstract description 160
- 150000001875 compounds Chemical class 0.000 claims abstract description 89
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 54
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- 125000003118 aryl group Chemical group 0.000 claims description 39
- 230000005525 hole transport Effects 0.000 claims description 34
- 125000001424 substituent group Chemical group 0.000 claims description 31
- 125000001072 heteroaryl group Chemical group 0.000 claims description 28
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- 239000000126 substance Substances 0.000 claims description 19
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- 239000001257 hydrogen Substances 0.000 claims description 17
- UJOBWOGCFQCDNV-UHFFFAOYSA-N 9H-carbazole Chemical compound C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 claims description 16
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- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical group C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- 125000002868 norbornyl group Chemical group C12(CCC(CC1)C2)* 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 125000002971 oxazolyl group Chemical group 0.000 description 1
- MPQXHAGKBWFSNV-UHFFFAOYSA-N oxidophosphanium Chemical group [PH3]=O MPQXHAGKBWFSNV-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 description 1
- KDLHZDBZIXYQEI-VENIDDJXSA-N palladium-100 Chemical compound [100Pd] KDLHZDBZIXYQEI-VENIDDJXSA-N 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 125000005582 pentacene group Chemical group 0.000 description 1
- JQQSUOJIMKJQHS-UHFFFAOYSA-N pentaphene Chemical group C1=CC=C2C=C3C4=CC5=CC=CC=C5C=C4C=CC3=CC2=C1 JQQSUOJIMKJQHS-UHFFFAOYSA-N 0.000 description 1
- 125000005561 phenanthryl group Chemical group 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
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- LFSXCDWNBUNEEM-UHFFFAOYSA-N phthalazine Chemical group C1=NN=CC2=CC=CC=C21 LFSXCDWNBUNEEM-UHFFFAOYSA-N 0.000 description 1
- XQZYPMVTSDWCCE-UHFFFAOYSA-N phthalonitrile Chemical compound N#CC1=CC=CC=C1C#N XQZYPMVTSDWCCE-UHFFFAOYSA-N 0.000 description 1
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- 229920000515 polycarbonate Polymers 0.000 description 1
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- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 150000004033 porphyrin derivatives Chemical class 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 235000011056 potassium acetate Nutrition 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- LNKHTYQPVMAJSF-UHFFFAOYSA-N pyranthrene Chemical group C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC3=C(C=CC=C4)C4=CC4=CC=C1C2=C34 LNKHTYQPVMAJSF-UHFFFAOYSA-N 0.000 description 1
- 125000004309 pyranyl group Chemical group O1C(C=CC=C1)* 0.000 description 1
- 150000003216 pyrazines Chemical class 0.000 description 1
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- RRZLWIPIQKXHAS-UHFFFAOYSA-N pyridine-2,3,5,6-tetracarbonitrile Chemical compound N#CC1=CC(C#N)=C(C#N)N=C1C#N RRZLWIPIQKXHAS-UHFFFAOYSA-N 0.000 description 1
- JOZPEVMCAKXSEY-UHFFFAOYSA-N pyrimido[5,4-d]pyrimidine Chemical group N1=CN=CC2=NC=NC=C21 JOZPEVMCAKXSEY-UHFFFAOYSA-N 0.000 description 1
- RQGPLDBZHMVWCH-UHFFFAOYSA-N pyrrolo[3,2-b]pyrrole Chemical class C1=NC2=CC=NC2=C1 RQGPLDBZHMVWCH-UHFFFAOYSA-N 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 125000002294 quinazolinyl group Chemical group N1=C(N=CC2=CC=CC=C12)* 0.000 description 1
- XMIAFAKRAAMSGX-UHFFFAOYSA-N quinolin-5-amine Chemical compound C1=CC=C2C(N)=CC=CC2=N1 XMIAFAKRAAMSGX-UHFFFAOYSA-N 0.000 description 1
- 150000004059 quinone derivatives Chemical class 0.000 description 1
- 150000004053 quinones Chemical class 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- YYMBJDOZVAITBP-UHFFFAOYSA-N rubrene Chemical compound C1=CC=CC=C1C(C1=C(C=2C=CC=CC=2)C2=CC=CC=C2C(C=2C=CC=CC=2)=C11)=C(C=CC=C2)C2=C1C1=CC=CC=C1 YYMBJDOZVAITBP-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- 235000021286 stilbenes Nutrition 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 125000005504 styryl 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
- IFLREYGFSNHWGE-UHFFFAOYSA-N tetracene Chemical compound C1=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C21 IFLREYGFSNHWGE-UHFFFAOYSA-N 0.000 description 1
- UGNWTBMOAKPKBL-UHFFFAOYSA-N tetrachloro-1,4-benzoquinone Chemical compound ClC1=C(Cl)C(=O)C(Cl)=C(Cl)C1=O UGNWTBMOAKPKBL-UHFFFAOYSA-N 0.000 description 1
- NLDYACGHTUPAQU-UHFFFAOYSA-N tetracyanoethylene Chemical group N#CC(C#N)=C(C#N)C#N NLDYACGHTUPAQU-UHFFFAOYSA-N 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- 150000004867 thiadiazoles Chemical class 0.000 description 1
- QKTRRACPJVYJNU-UHFFFAOYSA-N thiadiazolo[5,4-b]pyridine Chemical class C1=CN=C2SN=NC2=C1 QKTRRACPJVYJNU-UHFFFAOYSA-N 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 150000003577 thiophenes Chemical class 0.000 description 1
- NZFNXWQNBYZDAQ-UHFFFAOYSA-N thioridazine hydrochloride Chemical class Cl.C12=CC(SC)=CC=C2SC2=CC=CC=C2N1CCC1CCCCN1C NZFNXWQNBYZDAQ-UHFFFAOYSA-N 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 150000003918 triazines Chemical class 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- PWYVVBKROXXHEB-UHFFFAOYSA-M trimethyl-[3-(1-methyl-2,3,4,5-tetraphenylsilol-1-yl)propyl]azanium;iodide Chemical compound [I-].C[N+](C)(C)CCC[Si]1(C)C(C=2C=CC=CC=2)=C(C=2C=CC=CC=2)C(C=2C=CC=CC=2)=C1C1=CC=CC=C1 PWYVVBKROXXHEB-UHFFFAOYSA-M 0.000 description 1
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 1
- ZRXVCYGHAUGABY-UHFFFAOYSA-O tris(4-bromophenyl)azanium Chemical compound C1=CC(Br)=CC=C1[NH+](C=1C=CC(Br)=CC=1)C1=CC=C(Br)C=C1 ZRXVCYGHAUGABY-UHFFFAOYSA-O 0.000 description 1
- YGPLLMPPZRUGTJ-UHFFFAOYSA-N truxene Chemical class C1C2=CC=CC=C2C(C2=C3C4=CC=CC=C4C2)=C1C1=C3CC2=CC=CC=C21 YGPLLMPPZRUGTJ-UHFFFAOYSA-N 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- UGOMMVLRQDMAQQ-UHFFFAOYSA-N xphos Chemical compound CC(C)C1=CC(C(C)C)=CC(C(C)C)=C1C1=CC=CC=C1P(C1CCCCC1)C1CCCCC1 UGOMMVLRQDMAQQ-UHFFFAOYSA-N 0.000 description 1
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
- C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
- C07D471/04—Ortho-condensed systems
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/15—Hole transporting layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/623—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing five rings, e.g. pentacene
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/654—Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1003—Carbocyclic compounds
- C09K2211/1007—Non-condensed systems
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1003—Carbocyclic compounds
- C09K2211/1011—Condensed systems
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1088—Heterocyclic compounds characterised by ligands containing oxygen as the only heteroatom
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1092—Heterocyclic compounds characterised by ligands containing sulfur as the only heteroatom
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
Definitions
- the present invention relates to a light emitting element capable of converting electric energy into light and a material used therefor.
- the present invention can be used in fields such as display elements, flat panel displays, backlights, lighting, interiors, signs, signboards, electrophotographic machines, and optical signal generators.
- This light-emitting element is characterized by being thin and capable of high-intensity light emission under a low driving voltage and multicolor light emission by selecting a fluorescent material.
- Organic thin-film light-emitting elements must satisfy improved luminous efficiency, lower drive voltage, and improved durability.
- the compatibility between luminous efficiency and durability is a major issue.
- a material having a benzofluoranthene skeleton (Patent Document 1) and a material having a nitrogen-containing heterocyclic ring (Patent Document 2) have been developed in order to improve luminous efficiency and durability life.
- An object of the present invention is to provide an organic thin-film light-emitting element that solves the problems of the prior art and has improved luminous efficiency, driving voltage, and durability life.
- the present invention is a light emitting device material having a compound represented by the following general formula (1).
- Ar represents a group containing a benzofluoranthene skeleton
- Z is represented by the following general formula (2).
- L is a single bond, a substituted or unsubstituted arylene group, or a substituted or unsubstituted heteroarylene group.
- n is 1 or 2. When n is 2, two Zs may be the same or different.
- ring A and ring B are each a substituted or unsubstituted benzene ring, a substituted or unsubstituted condensed aromatic hydrocarbon ring, a substituted or unsubstituted monocyclic aromatic heterocyclic ring, or a substituted or unsubstituted ring Represents a fused aromatic heterocycle. However, at least one atom constituting ring A and ring B is electron-accepting nitrogen.
- R 1 are an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, an alkoxy group, an alkylthio group, an aryl, respectively. It is selected from the group consisting of an ether group, an arylthioether group, an aryl group, a heteroaryl group, a halogen, a carbonyl group, a carboxyl group, an oxycarbonyl group, a carbamoyl group, and —P ( ⁇ O) R 2 R 3 .
- R 1 may be hydrogen.
- R 2 and R 3 are an aryl group or a heteroaryl group.
- R 2 and R 3 may be condensed to form a ring. However, it is connected to L at any position among R 1 , ring A and ring B.
- n is 2, the positions at which two Z are connected to L may be the same or different.
- an organic thin film light emitting device that achieves both luminous efficiency, driving voltage, and durability.
- Ar represents a group containing a benzofluoranthene skeleton
- Z is represented by the following general formula (2).
- L is a single bond, a substituted or unsubstituted arylene group, or a substituted or unsubstituted heteroarylene group.
- n is 1 or 2. When n is 2, two Zs may be the same or different.
- ring A and ring B are each a substituted or unsubstituted benzene ring, a substituted or unsubstituted condensed aromatic hydrocarbon ring, a substituted or unsubstituted monocyclic aromatic heterocyclic ring, or a substituted or unsubstituted ring Represents a fused aromatic heterocycle. However, at least one atom constituting ring A and ring B is electron-accepting nitrogen.
- R 1 are an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, an alkoxy group, an alkylthio group, an aryl, respectively. It is selected from the group consisting of an ether group, an arylthioether group, an aryl group, a heteroaryl group, a halogen, a carbonyl group, a carboxyl group, an oxycarbonyl group, a carbamoyl group, and —P ( ⁇ O) R 2 R 3 .
- R 1 may be hydrogen.
- R 2 and R 3 are an aryl group or a heteroaryl group.
- R 2 and R 3 may be condensed to form a ring. However, it is connected to L at any position among R 1 , ring A and ring B.
- n is 2, the positions at which two Z are connected to L may be the same or different.
- the alkyl group represents, for example, a saturated aliphatic hydrocarbon group such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, or a tert-butyl group. It may or may not have a substituent. There is no restriction
- the number of carbon atoms of the alkyl group is not particularly limited, but is preferably 1 or more and 20 or less, more preferably 1 or more and 8 or less, from the viewpoint of availability and cost.
- the cycloalkyl group refers to, for example, a saturated alicyclic hydrocarbon group such as a cyclopropyl group, a cyclohexyl group, a norbornyl group, an adamantyl group, which may or may not have a substituent.
- the number of carbon atoms in the alkyl group moiety is not particularly limited, but is preferably in the range of 3 or more and 20 or less.
- the heterocyclic group refers to an aliphatic ring having atoms other than carbon, such as a pyran ring, a piperidine ring, and a cyclic amide, in the ring, which may or may not have a substituent. .
- carbon number of a heterocyclic group is not specifically limited, Preferably it is the range of 2-20.
- alkenyl group refers to an unsaturated aliphatic hydrocarbon group containing a double bond such as a vinyl group, an allyl group, or a butadienyl group, which may or may not have a substituent.
- carbon number of an alkenyl group is not specifically limited, Preferably it is the range of 2-20.
- the cycloalkenyl group refers to an unsaturated alicyclic hydrocarbon group containing a double bond such as a cyclopentenyl group, a cyclopentadienyl group, or a cyclohexenyl group, which may have a substituent. You don't have to.
- the alkynyl group indicates, for example, an unsaturated aliphatic hydrocarbon group containing a triple bond such as an ethynyl group, which may or may not have a substituent.
- the number of carbon atoms of the alkynyl group is not particularly limited, but is preferably in the range of 2 or more and 20 or less.
- the alkoxy group refers to, for example, a functional group having an aliphatic hydrocarbon group bonded through an ether bond such as a methoxy group, an ethoxy group, or a propoxy group, and the aliphatic hydrocarbon group may have a substituent. It may not have.
- carbon number of an alkoxy group is not specifically limited, Preferably it is the range of 1-20.
- the alkylthio group is a group in which an oxygen atom of an ether bond of an alkoxy group is substituted with a sulfur atom.
- the hydrocarbon group of the alkylthio group may or may not have a substituent. Although carbon number of an alkylthio group is not specifically limited, Preferably it is the range of 1-20.
- An aryl ether group refers to a functional group to which an aromatic hydrocarbon group is bonded via an ether bond, such as a phenoxy group, and the aromatic hydrocarbon group may or may not have a substituent. Good. Although carbon number of an aryl ether group is not specifically limited, Preferably, it is the range of 6-40.
- the aryl thioether group is a group in which an oxygen atom of an ether bond of an aryl ether group is substituted with a sulfur atom.
- the aromatic hydrocarbon group in the aryl ether group may or may not have a substituent. Although carbon number of an aryl ether group is not specifically limited, Preferably, it is the range of 6-40.
- the aryl group represents an aromatic hydrocarbon group such as a phenyl group, a naphthyl group, a biphenyl group, a phenanthryl group, a terphenyl group, a pyrenyl group, or a fluoranthenyl group.
- the aryl group may or may not have a substituent. Although carbon number of an aryl group is not specifically limited, Preferably, it is the range of 6-40.
- a heteroaryl group is a furanyl group, thiophenyl group, pyridyl group, quinolinyl group, isoquinolinyl group, pyrazinyl group, pyrimidyl group, naphthyridyl group, benzofuranyl group, benzothiophenyl group, indolyl group, dibenzofuranyl group, dibenzothiophenyl group And a cyclic aromatic group having one or more atoms other than carbon in the ring, such as a carbazolyl group, which may be unsubstituted or substituted.
- carbon number of heteroaryl group is not specifically limited, Preferably it is the range of 2-30.
- Halogen refers to an atom selected from fluorine, chlorine, bromine and iodine.
- the carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group and phosphine oxide group may or may not have a substituent.
- substituents include an alkyl group, a cycloalkyl group, an aryl group, and a heteroaryl group, and these substituents may be further substituted.
- An arylene group refers to a divalent or trivalent group derived from an aromatic hydrocarbon group such as a phenyl group, a naphthyl group, or a biphenyl group, which may or may not have a substituent.
- L in the general formula (1) is an arylene group, the number of nuclear carbon atoms is preferably in the range of 6 to 30.
- arylene group examples include 1,4-phenylene group, 1,3-phenylene group, 1,2-phenylene group, 4,4′-biphenylylene group, 4,3′-biphenylylene group, 3,3 Examples include '-biphenylylene group, 1,4-naphthylene group, 1,5-naphthylene group, 2,5-naphthylene group, 2,6-naphthylene group, 2,7-naphthylene group and the like. More preferred are a 1,4-phenylene group and a 1,3-phenylene group.
- the heteroarylene group is an aromatic group having one or more atoms other than carbon such as pyridyl group, quinolinyl group, pyrimidinyl group, pyrazinyl group, naphthyridyl group, dibenzofuranyl group, dibenzothiophenyl group, carbazolyl group in the ring.
- a divalent or trivalent group derived from a group is shown, which may or may not have a substituent.
- the number of carbon atoms of the heteroarylene group is not particularly limited, but is preferably in the range of 2-30.
- the condensed aromatic hydrocarbon ring is, for example, naphthalene ring, azulene ring, anthracene ring, phenanthrene ring, pyrene ring, chrysene ring, naphthacene ring, triphenylene ring, acenaphthene ring, coronene ring, fluorene ring, fluoranthene ring, naphthacene ring, Examples include a pentacene ring, a perylene ring, a pentaphen ring, a picene ring, a pyranthrene ring, and an anthraanthrene ring. Furthermore, the condensed aromatic hydrocarbon ring may have a substituent.
- Examples of the monocyclic aromatic heterocycle include a furan ring, a thiophene ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, an oxadiazole ring, a triazole ring, an imidazole ring, a pyrazole ring, and a thiazole ring.
- the monocyclic aromatic heterocycle may have a substituent.
- the condensed aromatic heterocycle includes, for example, a quinoline ring, isoquinoline ring, quinoxaline ring, benzimidazole ring, indole ring, benzimidazole ring, benzothiazole ring, benzoxazole ring, quinoxaline ring, quinazoline ring, phthalazine ring, carbazole ring, And a carboline ring, a diazacarbazole ring (indicating a ring in which one of the carbon atoms of the hydrocarbon ring constituting the carboline ring is further substituted with a nitrogen atom).
- the fused aromatic heterocycle may have a substituent.
- L is a single bond, a substituted or unsubstituted arylene group, or a substituted or unsubstituted heteroarylene group.
- the group represented by Z represented by the general formula (2) is linked to L at any position among R 1 , ring A and ring B. Connecting to L at any position among R 1 , ring A and ring B means the following. First, the coupling with L at a position of R 1 refers to the nitrogen atom and L that R 1 is linked directly binds. Further, linking to L at any position of ring A and ring B means that when ring A is a benzene ring, L is directly bonded to any of the carbon atoms constituting the benzene ring. .
- L is not particularly limited, but is preferably a single bond or a substituted or unsubstituted arylene group.
- L is a single bond or a substituted or unsubstituted arylene group, conjugation spreads, and high carrier mobility and high electron acceptability are expressed. As a result, the light emitting element can be driven at a lower voltage, and the light emission efficiency can be further improved.
- L is not particularly limited, but is preferably a substituted or unsubstituted arylene group.
- L is a substituted or unsubstituted arylene group
- conjugation is further expanded, and high carrier mobility and high electron acceptability are expressed.
- the light emitting element can be driven at a lower voltage, and the light emission efficiency can be further improved.
- the crystallinity can be lowered and the glass transition temperature can be increased and the stability of the film is improved, the lifetime can be further improved when used in a light-emitting element.
- n is 1 or 2. That is, the compound represented by the general formula (1) has one or two groups represented by Z, so that the crystallinity is lowered or the glass transition temperature is increased. , The stability of the film is further improved. n is preferably 1. When n is 1, sublimation property and deposition stability are further improved.
- Ar is a group containing a benzofluoranthene skeleton, and the light-emitting element material of the present invention has a benzofluoranthene skeleton.
- the benzofluoranthene skeleton has a 5-membered 5-membered ring structure.
- the 5 ⁇ -electron five-membered ring structure becomes a 6 ⁇ -electron system when one electron enters (reduced), and aromatic stabilization occurs (Hückel rule). For this reason, the 5-membered 5-membered ring structure exhibits high electron affinity, and the benzofluoranthene skeleton of the present invention also has high electron affinity.
- anthracene and pyrene which are generally well-known condensed aromatic skeletons, do not have a 5-membered 5-membered ring structure, there is no increase in electron affinity due to aromatic stabilization by reduction, and these phenomena Is characteristic of a skeleton having a 5-membered 5-membered ring structure. Therefore, when the light-emitting element material of the present invention is used for a light-emitting element, for example, when used for an electron transport layer, it exhibits good electron injection from the electrode, and the driving voltage of the light-emitting element can be lowered. . As a result, the light emission efficiency of the light emitting element can be improved. In addition, it contributes to extending the life of the light emitting element.
- the benzofluoranthene skeleton has high planarity, and since the molecules overlap each other well, it has a high charge transport property.
- the benzofluoranthene skeleton has a higher charge transport property than, for example, fluoranthene because of its high planarity.
- the benzofluoranthene skeleton has high charge stability and can be smoothly and repeatedly reduced by electrons and oxidized by holes.
- the lifetime can be improved.
- At least one atom constituting ring A and ring B is electron-accepting nitrogen.
- the electron-accepting nitrogen represents a nitrogen atom that forms a multiple bond with an adjacent atom. Since the nitrogen atom has high electronegativity, the multiple bond has an electron accepting property. Therefore, Z having electron-accepting nitrogen has a high electron affinity. Therefore, when the light emitting device material of the present invention is used for a light emitting layer or an electron transport layer, good electron injection properties from the electrode can be exhibited, and the driving voltage of the light emitting device can be lowered. As a result, the light emission efficiency of the light emitting element can be improved. In addition, it contributes to extending the life of the light emitting element.
- the number of electron accepting nitrogens constituting the ring A and the ring B is one.
- Z when there is one electron-accepting nitrogen constituting ring A and ring B, when used for the electron transport layer, both electron injection from the electrode and electron injection into the light-emitting layer can be achieved.
- the driving voltage of the light emitting element can be further reduced. As a result, the light emission efficiency of the light emitting element can be improved.
- the group represented by Z has electron donating nitrogen.
- the electron-donating nitrogen represents a nitrogen atom in which all the bonds between adjacent atoms are single bonds. In the group represented by Z, this corresponds to the nitrogen atom to which R 1 is bonded. Electron-donating nitrogen has high stability against holes and can be smoothly and repeatedly oxidized by holes. Therefore, when the compound represented by the general formula (1) of the present invention is used for the hole transport layer, the lifetime can be improved.
- the light emitting device material of the present invention has a group represented by Z, the sublimation property, the deposition stability, the crystallinity is lowered, and the stability of the film due to a high glass transition temperature is improved. Thereby, when the light emitting element material of this invention is used for a light emitting element, the lifetime can be improved.
- the light emitting device material of the present invention has high electron injecting and transporting properties, electrochemical properties by having Ar and Z groups containing a benzofluoranthene skeleton in the molecule. Combines stability, good sublimation, good deposition stability, good film quality and high glass transition temperature. Accordingly, when the light-emitting element material of the present invention is used in any layer constituting the light-emitting element, an organic thin-film light-emitting element that achieves both high luminous efficiency, low driving voltage, and durability life can be achieved.
- benzofluoranthene skeleton examples include benzo [k] fluoranthene skeleton (8,9-benzofluoranthene skeleton), benzo [j] fluoranthene skeleton (7,8-benzofluoranthene skeleton), and benzo [a] fluoranthene skeleton.
- examples of the group containing benzofluoranthene skeleton include benzofluoranthene skeleton If included, it may be further modified with a condensed ring.
- a benzo [k] fluoranthene skeleton is preferable. That is, Ar is preferably a group represented by the following general formula (3).
- the benzofluoranthene skeleton is represented by the general formula (3), the conjugated system spreads moderately. This makes it more electrochemically stable and further improves the charge transport property.
- each of R 4 to R 15 may be the same or different, and is hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy group, alkylthio group, aryl ether group. , Arylthioether group, aryl group, heteroaryl group, halogen, carbonyl group, carboxyl group, oxycarbonyl group, and carbamoyl group.
- R 4 to R 15 may form a ring with adjacent substituents. However, it is connected to L at any one position among R 4 to R 15 .
- R 4 to R 15 are preferably selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, and a halogen.
- R 4 to R 15 are selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, and a halogen.
- the glass transition temperature is increased and the thin film stability is improved.
- the thin film stability is improved, the deterioration of the film is suppressed even when the light emitting element is driven for a long time, so that the durability is further improved.
- the heat resistance is further improved.
- the decomposition of the material can be suppressed at the time of device fabrication, so that the durability is improved.
- it is an aryl group or a heteroaryl group, conjugation spreads, so that it becomes more electrochemically stable and the charge transport property is further improved.
- R 8 and R 13 in the general formula (3) are preferably substituted or unsubstituted aryl groups.
- R 8 and R 13 are substituted or unsubstituted aryl groups, it is possible to moderately avoid overlapping of ⁇ conjugate planes between molecules.
- heat resistance improves more because R ⁇ 8 > and R ⁇ 13> is a substituted or unsubstituted aryl group.
- it without impairing the high charge transport property of the benzofluoranthene compound, it contributes to the improvement of sublimation, the improvement of vapor deposition stability, the reduction of crystallinity and the improvement of thin film stability due to a high glass transition temperature.
- R 8 and R 13 in the general formula (3) are more preferably a substituted or unsubstituted phenyl group.
- R 8 and R 13 are substituted or unsubstituted phenyl groups, it is possible to moderately avoid overlapping of ⁇ conjugate planes between molecules. Moreover, since it becomes a moderate molecular weight, sublimation property and vapor deposition stability further improve.
- the compound represented by the general formula (1) is preferably a compound represented by the following general formula (4).
- conjugation easily spreads at the positions of R 4 and R 5 , and conjugation efficiently spreads when R 4 is used for linking with L.
- the compound represented by the general formula (4) becomes more electrochemically stable, and the charge transport property is further improved.
- each of R 5 to R 15 may be the same or different, and is hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy group, alkylthio group, aryl ether group. , Arylthioether group, aryl group, heteroaryl group, halogen, carbonyl group, carboxyl group, oxycarbonyl group, and carbamoyl group.
- R 5 to R 15 may form a ring with adjacent substituents.
- L, Z and n are the same as in the general formula (1).
- R 5 to R 15 in the general formula (4) are preferably selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, and a halogen among the above.
- R 5 to R 15 are selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, and a halogen
- the glass transition temperature becomes higher and the thin film stability is further improved.
- it since it is a substituent which is hard to decompose even at high temperatures, the heat resistance is further improved.
- Z is preferably a group represented by any one of the following general formulas (5) to (9).
- Z is a group represented by any one of the following general formulas (5) to (9).
- Z is a group represented by any one of the following general formulas (5) to (9)
- high electron mobility and high electron acceptability can be expressed, and the driving voltage of the light emitting element can be further reduced.
- the light emission efficiency of the light emitting element can be further improved.
- it contributes to extending the life of the light emitting element.
- ring B represents a substituted or unsubstituted benzene ring, a substituted or unsubstituted condensed aromatic hydrocarbon ring, a substituted or unsubstituted monocyclic aromatic heterocyclic ring, or a substituted or unsubstituted condensed aromatic heterocyclic ring.
- ring B is a substituted or unsubstituted monocyclic aromatic heterocyclic ring, or a substituted or unsubstituted condensed aromatic heterocyclic ring, and at least one of constituting ring B The atom is electron-accepting nitrogen.
- R 16 to R 31 are each hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, hetero It is selected from the group consisting of an aryl group, halogen, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group and —P ( ⁇ O) R 2 R 3 .
- Ring B preferably has a structure represented by any of the following general formulas (10) to (13).
- the ring B has a structure represented by any one of the following general formulas (10) to (13)
- high carrier mobility and high electron acceptability are expressed.
- the light emitting element can be driven at a lower voltage, and the light emission efficiency can be improved.
- it contributes to the improvement of sublimation property, the improvement of vapor deposition stability, the deterioration of crystallinity, and the stability of the film due to a high glass transition temperature.
- B 1 to B 22 represent C—R 32 or N.
- Z is a group represented by the general formula (5)
- B 1 to B 22 are substituted, the substituent is the same as in the general formula (2).
- R 32 is hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heteroaryl group, It is selected from the group consisting of halogen, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group and —P ( ⁇ O) R 2 R 3 .
- Ring B is not particularly limited, but a structure represented by any one of formulas (11) to (13) is more preferable.
- ring B has a structure represented by any one of the general formulas (11) to (13), conjugation is further expanded, and high carrier mobility and high electron acceptability are expressed. As a result, the light emitting element can be driven at a lower voltage, and the light emission efficiency can be further improved.
- R 1 is the same as in the general formula (2).
- the light emitting device material of the present invention is not particularly limited, but specific examples include the following.
- a known method can be used.
- a method for introducing Z into the benzofluoranthene skeleton for example, there is a method using a coupling reaction of a substituted or unsubstituted halogenated benzofluoranthene derivative with a substituted or unsubstituted Z under a palladium catalyst or a nickel catalyst.
- Z is introduced into the benzofluoranthene skeleton via an arylene group or heteroarylene group
- an arylboronic acid or heteroarylboronic acid substituted with Z may be used.
- boronic acid esters may be used in place of the various boronic acids described above.
- the light emitting device material of the present invention represents a material used for any layer of the light emitting device, and is a material used for a layer selected from a hole transport layer, a light emitting layer and an electron transport layer, as will be described later.
- the material used for the protective film of a cathode is also included.
- the light emitting device of the present invention has an anode and a cathode, and an organic layer interposed between the anode and the cathode, and the organic layer includes at least a light emitting layer and an electron transport layer, and the light emitting layer emits light by electric energy. To do.
- the organic layer is composed of only the light emitting layer / electron transport layer, 1) hole transport layer / light emitting layer / electron transport layer and 2) hole transport layer / light emitting layer / electron transport layer / electron injection layer, 3) Laminate structure such as hole injection layer / hole transport layer / light emitting layer / electron transport layer / electron injection layer can be mentioned.
- Each of the layers may be a single layer or a plurality of layers.
- the light emitting device material of the present invention may be used in any layer in the above device configuration, but has high electron injection and transport capability, fluorescence quantum yield, and thin film stability. It is preferable to use for a layer or an electron carrying layer. In particular, since it has an excellent electron injecting and transporting capability, it is more preferably used for the electron transporting layer.
- the anode and the cathode have a role of supplying a sufficient current for light emission of the device, and at least one of them is preferably transparent or translucent in order to extract light.
- the anode formed on the substrate is a transparent electrode.
- the material used for the anode is a material that can efficiently inject holes into the organic layer, and is transparent or translucent to extract light.
- Tin oxide, indium oxide, indium tin oxide (ITO) indium zinc oxide (IZO) Although not particularly limited, such as conductive metal oxides such as, metals such as gold, silver and chromium, inorganic conductive materials such as copper iodide and copper sulfide, conductive polymers such as polythiophene, polypyrrole and polyaniline It is particularly preferable to use ITO glass or Nesa glass. These electrode materials may be used alone, or a plurality of materials may be laminated or mixed.
- the resistance of the transparent electrode is not limited as long as it can supply a sufficient current for light emission of the element, but it is preferably low resistance from the viewpoint of power consumption of the element.
- an ITO substrate with a resistance of 300 ⁇ / ⁇ or less will function as a device electrode, but since it is now possible to supply a substrate with a resistance of approximately 10 ⁇ / ⁇ , use a substrate with a low resistance of 20 ⁇ / ⁇ or less. Is particularly preferred.
- the thickness of ITO can be arbitrarily selected according to the resistance value, but is usually used in a range of 100 to 300 nm.
- the light emitting element is preferably formed over a substrate.
- a glass substrate such as soda glass or non-alkali glass is preferably used.
- the thickness of the glass substrate it is sufficient that the thickness is sufficient to maintain the mechanical strength.
- alkali-free glass is preferred because it is better that there are fewer ions eluted from the glass.
- soda lime glass provided with a barrier coat such as SiO 2 is also commercially available and can be used.
- the substrate need not be glass, and for example, an anode may be formed on a plastic substrate.
- the ITO film forming method is not particularly limited, such as an electron beam method, a sputtering method, and a chemical reaction method.
- the material used for the cathode is not particularly limited as long as it can efficiently inject electrons into the light emitting layer.
- metals such as platinum, gold, silver, copper, iron, tin, aluminum, and indium, or alloys and multilayer stacks of these metals with low work function metals such as lithium, sodium, potassium, calcium, and magnesium Is preferred.
- aluminum, silver, and magnesium are preferable as the main component from the viewpoints of electrical resistance, ease of film formation, film stability, luminous efficiency, and the like.
- magnesium and silver are preferable because electron injection into the electron transport layer and the electron injection layer in the present invention becomes easier and further low-voltage driving is possible.
- metals such as platinum, gold, silver, copper, iron, tin, aluminum and indium, or alloys using these metals, inorganic materials such as silica, titania and silicon nitride, polyvinyl alcohol, polyvinyl chloride
- an organic polymer compound such as a hydrocarbon polymer compound is laminated on the cathode as a protective film layer.
- the light emitting device material of the present invention can also be used as this protective film layer.
- the protective film layer is selected from materials that are light transmissive in the visible light region.
- the production method of these electrodes is not particularly limited, such as resistance heating, electron beam, sputtering, ion plating and coating.
- the hole transport layer is formed by a method of laminating or mixing one or more hole transport materials or a method using a mixture of a hole transport material and a polymer binder.
- the hole transport material needs to efficiently transport holes from the positive electrode between electrodes to which an electric field is applied, has high hole injection efficiency, and can efficiently transport injected holes. preferable.
- the material has an appropriate ionization potential, has a high hole mobility, is excellent in stability, and does not easily generate trapping impurities during manufacture and use.
- a substance satisfying such conditions is not particularly limited.
- the light-emitting element material of the present invention can also be used as a hole transport material because of its high hole mobility and excellent electrochemical stability.
- the light emitting device material of the present invention may be used as a hole injecting material. However, since it has a high hole mobility, it is preferably used as a hole transporting material.
- the light emitting device material of the present invention has excellent electron injecting and transporting properties, there is a concern that when this is used for an electron transporting layer, electrons do not recombine in the light emitting layer and partly escape to the hole transporting layer. is there. Therefore, it is preferable to use a compound having an excellent electron blocking property for the hole transport layer.
- a compound containing a carbazole skeleton is preferable because it has excellent electron blocking properties and can contribute to the improvement in efficiency of the light-emitting element.
- the compound containing a carbazole skeleton preferably contains a carbazole dimer, a carbazole trimer, or a carbazole tetramer skeleton. This is because they have both a good electron blocking property and a hole injection / transport property.
- the light emitting layer to be combined contains a phosphorescent light emitting material described later.
- the above compound having a carbazole skeleton also has a high triplet exciton blocking function and can increase the light emission efficiency when combined with a phosphorescent material.
- the compound containing a carbazole skeleton or the compound containing a triphenylene skeleton may be used alone as a hole transport layer, or may be used as a mixture with each other. Further, other materials may be mixed within a range not impairing the effects of the present invention.
- the hole transport layer is composed of a plurality of layers, any one layer may contain a compound containing a carbazole skeleton or a compound containing a triphenylene skeleton.
- a hole injection layer may be provided between the anode and the hole transport layer.
- the hole injection layer By providing the hole injection layer, the light emitting element is further driven at a lower driving voltage, and the durability life is further improved.
- a material having a smaller ionization potential than that of the material normally used for the hole transport layer is preferably used.
- a benzidine derivative such as TPD232 and a starburst arylamine material group can be used, and a phthalocyanine derivative can also be used.
- the hole injection layer is composed of an acceptor compound alone or that the acceptor compound is doped with another hole transport material.
- acceptor compounds include metal chlorides such as iron (III) chloride, aluminum chloride, gallium chloride, indium chloride, antimony chloride, metal oxides such as molybdenum oxide, vanadium oxide, tungsten oxide, ruthenium oxide, A charge transfer complex such as tris (4-bromophenyl) aminium hexachloroantimonate (TBPAH).
- metal chlorides such as iron (III) chloride, aluminum chloride, gallium chloride, indium chloride, antimony chloride, metal oxides such as molybdenum oxide, vanadium oxide, tungsten oxide, ruthenium oxide,
- a charge transfer complex such as tris (4-bromophenyl) aminium hexachloroantimonate (TBPAH).
- organic compounds having a nitro group, cyano group, halogen or trifluoromethyl group in the molecule quinone compounds, acid anhydride compounds, fullerenes, and the like are also preferably used.
- these compounds include hexacyanobutadiene, hexacyanobenzene, tetracyanoethylene, tetracyanoquinodimethane (TCNQ), tetrafluorotetracyanoquinodimethane (F4-TCNQ), 2, 3, 6, 7 , 10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene (HAT-CN6), p-fluoranyl, p-chloranil, p-bromanyl, p-benzoquinone, 2,6-dichlorobenzoquinone 2,5-dichlorobenzoquinone, tetramethylbenzoquinone, 1,2,4,5-tetracyanobenzene, o-dicyanobenzene, p-dicyanobenzene, 1,4-dicyanotetrafluorobenzene, 2,3-dichloro-5 , 6-Dicyanobenzoquinone, p-
- metal oxides and cyano group-containing compounds are preferable because they are easy to handle and can be easily deposited, so that the above-described effects can be easily obtained.
- preferred metal oxides include molybdenum oxide, vanadium oxide, or ruthenium oxide.
- cyano group-containing compounds (a) a compound having in the molecule at least one electron-accepting nitrogen other than the nitrogen atom of the cyano group, and (b) a compound having both a halogen and a cyano group in the molecule (C) a compound having both a carbonyl group and a cyano group in the molecule, or (d) at least one electron other than the nitrogen atom of the cyano group, having both a halogen and a cyano group in the molecule.
- a compound having an accepting nitrogen is more preferable because it becomes a strong electron acceptor. Specific examples of such a compound include the following compounds.
- the hole injection layer is composed of an acceptor compound alone or when the hole injection layer is doped with an acceptor compound
- the hole injection layer may be a single layer, A plurality of layers may be laminated.
- the hole injection material used in combination when the acceptor compound is doped is the same compound as the compound used for the hole transport layer from the viewpoint that the hole injection barrier to the hole transport layer can be relaxed. Is more preferable.
- the light emitting layer may be either a single layer or a plurality of layers, each formed by a light emitting material (host material, dopant material), which may be a mixture of a host material and a dopant material or a host material alone, Either is acceptable. That is, in the light emitting element of the present invention, only the host material or the dopant material may emit light in each light emitting layer, or both the host material and the dopant material may emit light. From the viewpoint of efficiently using electric energy and obtaining light emission with high color purity, the light emitting layer is preferably composed of a mixture of a host material and a dopant material. Further, the host material and the dopant material may be either one kind or a plurality of combinations, respectively.
- a light emitting material host material, dopant material
- the dopant material may be included in the entire host material or may be partially included.
- the dopant material may be laminated or dispersed.
- the dopant material can control the emission color. If the amount of the dopant material is too large, a concentration quenching phenomenon occurs, so that it is preferably used at 20% by weight or less, more preferably 10% by weight or less with respect to the host material.
- the doping method can be formed by a co-evaporation method with a host material, but may be simultaneously deposited after being previously mixed with the host material.
- the light-emitting material includes condensed ring derivatives such as anthracene and pyrene, which have been known as light emitters, metal chelated oxinoid compounds such as tris (8-quinolinolato) aluminum, bisstyrylanthracene derivatives and diesters.
- condensed ring derivatives such as anthracene and pyrene, which have been known as light emitters
- metal chelated oxinoid compounds such as tris (8-quinolinolato) aluminum, bisstyrylanthracene derivatives and diesters.
- Bisstyryl derivatives such as styrylbenzene derivatives, tetraphenylbutadiene derivatives, indene derivatives, coumarin derivatives, oxadiazole derivatives, pyrrolopyridine derivatives, perinone derivatives, cyclopentadiene derivatives, oxadiazole derivatives, thiadiazolopyridine derivatives, dibenzofuran derivatives, carbazole
- polyphenylene vinylene derivatives, polyparaphenylene derivatives, polythiophene derivatives, etc. can be used, but are not particularly limited. Not shall.
- the host material contained in the light emitting material is not particularly limited, but is a compound having a condensed aryl ring such as naphthalene, anthracene, phenanthrene, pyrene, chrysene, naphthacene, triphenylene, perylene, fluoranthene, fluorene, indene, and derivatives thereof, N, Aromatic amine derivatives such as N′-dinaphthyl-N, N′-diphenyl-4,4′-diphenyl-1,1′-diamine, metal chelating oxinoids including tris (8-quinolinato) aluminum (III) Compounds, bisstyryl derivatives such as distyrylbenzene derivatives, tetraphenylbutadiene derivatives, indene derivatives, coumarin derivatives, oxadiazole derivatives, pyrrolopyridine derivatives, perinone derivatives, cyclopentadiene derivatives, pyr
- the dopant material is not particularly limited, but is a compound having a condensed aryl ring such as naphthalene, anthracene, phenanthrene, pyrene, chrysene, triphenylene, perylene, fluoranthene, fluorene, indene or a derivative thereof (for example, 2- (benzothiazole-2) -Yl) -9,10-diphenylanthracene, 5,6,11,12-tetraphenylnaphthacene), furan, pyrrole, thiophene, silole, 9-silafluorene, 9,9'-spirobisilafluorene, benzo Compounds with heteroaryl rings such as thiophene, benzofuran, indole, dibenzothiophene, dibenzofuran, imidazopyridine, phenanthroline, pyridine, pyrazine, naphthyridine
- a phosphorescent material may be included in the light emitting layer.
- a phosphorescent material is a material that exhibits phosphorescence even at room temperature. When a phosphorescent material is used as a dopant, it is basically necessary to obtain phosphorescence even at room temperature, but there is no particular limitation, and iridium (Ir), ruthenium (Ru), rhodium (Rh), An organometallic complex compound containing at least one metal selected from the group consisting of palladium (Pd), platinum (Pt), osmium (Os), and rhenium (Re) is preferable.
- an organometallic complex having iridium or platinum is more preferable.
- Hosts used in combination with a phosphorescent dopant include indole derivatives, carbazole derivatives, indolocarbazole derivatives, pyridine, pyrimidine, nitrogen-containing aromatic compound derivatives having a triazine skeleton, polyarylbenzene derivatives, spirofluorene derivatives, Aromatic hydrocarbon compound derivatives such as truxene derivatives and triphenylene derivatives, compounds containing chalcogen elements such as dibenzofuran derivatives and dibenzothiophene derivatives, and organometallic complexes such as beryllium quinolinol complexes are preferably used.
- triplet light-emitting dopants may be contained, or two or more host materials may be contained. Further, one or more triplet light emitting dopants and one or more fluorescent light emitting dopants may be contained.
- Preferred phosphorescent host or dopant is not particularly limited, but specific examples include the following.
- the light-emitting element material of the present invention can also be used as a light-emitting material because it has high light-emitting performance. Since the light emitting device material of the present invention exhibits strong light emission in the ultraviolet to blue region (300 to 500 nm region), it can be suitably used as a blue light emitting material.
- the light-emitting device material of the present invention may be used as a host material, but is preferably used as a dopant material because it has a high fluorescence quantum yield.
- the electron transport layer is a layer in which electrons are injected from the cathode and further transports electrons.
- the electron transport layer has high electron injection efficiency, and it is desired to efficiently transport injected electrons. Therefore, the electron transport layer is preferably made of a material having a high electron affinity, a high electron mobility, excellent stability, and impurities that are traps are less likely to be generated during manufacture and use.
- the electron transport layer in the present invention includes a hole blocking layer that can efficiently block the movement of holes as the same meaning.
- Examples of the electron transport material used for the electron transport layer include condensed polycyclic aromatic derivatives such as naphthalene and anthracene, styryl aromatic ring derivatives represented by 4,4′-bis (diphenylethenyl) biphenyl, anthraquinone and diphenoquinone Quinoline derivatives, phosphorus oxide derivatives, quinolinol complexes such as tris (8-quinolinolato) aluminum (III), benzoquinolinol complexes, hydroxyazole complexes, azomethine complexes, tropolone metal complexes, and flavonol metal complexes.
- An aromatic heterocycle containing electron-accepting nitrogen has high electron affinity.
- An electron transport material having electron-accepting nitrogen makes it easier to receive electrons from a cathode having a high electron affinity, and can be driven at a lower voltage.
- the number of electrons supplied to the light emitting layer increases and the recombination probability increases, the light emission efficiency is further improved.
- heteroaryl ring containing an electron-accepting nitrogen examples include, for example, a pyridine ring, pyrazine ring, pyrimidine ring, quinoline ring, quinoxaline ring, naphthyridine ring, pyrimidopyrimidine ring, benzoquinoline ring, phenanthroline ring, imidazole ring, oxazole ring, Examples thereof include an oxadiazole ring, a triazole ring, a thiazole ring, a thiadiazole ring, a benzoxazole ring, a benzothiazole ring, a benzimidazole ring, and a phenanthrimidazole ring.
- Examples of these compounds having a heteroaryl ring structure include benzimidazole derivatives, benzoxazole derivatives, benzthiazole derivatives, oxadiazole derivatives, thiadiazole derivatives, triazole derivatives, pyrazine derivatives, phenanthroline derivatives, quinoxaline derivatives, quinoline derivatives, benzoins.
- Preferred compounds include quinoline derivatives, oligopyridine derivatives such as bipyridine and terpyridine, quinoxaline derivatives and naphthyridine derivatives.
- imidazole derivatives such as tris (N-phenylbenzimidazol-2-yl) benzene, oxadiazole derivatives such as 1,3-bis [(4-tert-butylphenyl) 1,3,4-oxadiazolyl] phenylene, Triazole derivatives such as N-naphthyl-2,5-diphenyl-1,3,4-triazole, phenanthroline derivatives such as bathocuproine and 1,3-bis (1,10-phenanthroline-9-yl) benzene, 2,2 ′
- a benzoquinoline derivative such as bis (benzo [h] quinolin-2-yl) -9,9′-spirobifluorene, 2,5-bis (6 ′-(2 ′, 2 ′′ -bipyridyl))-1, Bipyridine derivatives such as 1-dimethyl-3,4-diphenylsilole, 1,3-bis (4 ′-(2,2 )
- the condensed polycyclic aromatic skeleton is particularly preferably an anthracene skeleton, a pyrene skeleton or a phenanthroline skeleton.
- the electron transport material may be used alone, but two or more of the electron transport materials may be mixed and used, or one or more of the other electron transport materials may be mixed with the electron transport material.
- the preferred electron transport material is not particularly limited, but specific examples include the following.
- the light emitting device material of the present invention is also suitably used as an electron transport material because it has a high electron injection transport capability.
- the light emitting device material of the present invention When the light emitting device material of the present invention is used, it is not necessary to limit to only one of them, and a mixture of a plurality of benzofluoranthene compounds of the present invention is used, or one or more other electron transport materials are used. You may mix and use with the benzofluoranthene compound of this invention in the range which does not impair the effect of this invention.
- the electron transport material that can be mixed is not particularly limited, but is a compound having a condensed aryl ring such as naphthalene, anthracene, or pyrene or a derivative thereof, or a styryl-based fragrance represented by 4,4′-bis (diphenylethenyl) biphenyl.
- Ring derivatives perylene derivatives, perinone derivatives, coumarin derivatives, naphthalimide derivatives, quinone derivatives such as anthraquinone and diphenoquinone, phosphorus oxide derivatives, carbazole derivatives and indole derivatives, quinolinol complexes such as tris (8-quinolinolato) aluminum (III) and hydroxy Examples include hydroxyazole complexes such as phenyloxazole complexes, azomethine complexes, tropolone metal complexes, and flavonol metal complexes.
- the electron transport material may be used alone, but two or more of the electron transport materials may be mixed and used, or one or more of the other electron transport materials may be mixed and used in the electron transport material.
- a donor material may be contained.
- the donor material is a compound that makes it easier to inject electrons from the cathode or the electron injection layer into the electron transport layer by improving the electron injection barrier, and further improves the electrical conductivity of the electron transport layer.
- Preferred examples of the donor material in the present invention include an alkali metal, an inorganic salt containing an alkali metal, a complex of an alkali metal and an organic material, an alkaline earth metal, an inorganic salt containing an alkaline earth metal, or an alkaline earth metal And a complex of organic substance.
- Preferable types of alkali metals and alkaline earth metals include alkali metals such as lithium, sodium and cesium, which have a low work function and a large effect of improving the electron transport ability, and alkaline earth metals such as magnesium and calcium.
- inorganic salts include oxides such as LiO and Li 2 O, nitrides, fluorides such as LiF, NaF, and KF, Li 2 CO 3 , Na 2 CO 3 , K 2 CO 3 , Rb 2 CO 3 , Examples thereof include carbonates such as Cs 2 CO 3 .
- a preferable example of the alkali metal or alkaline earth metal is lithium from the viewpoint that the raw materials are inexpensive and easy to synthesize.
- Preferred examples of the organic substance in the complex with the organic substance include quinolinol, benzoquinolinol, flavonol, hydroxyimidazopyridine, hydroxybenzazole, hydroxytriazole and the like.
- a complex of an alkali metal and an organic substance is preferable, a complex of lithium and an organic substance is more preferable, and lithium quinolinol is particularly preferable. Two or more of these donor materials may be mixed and used.
- the suitable doping concentration varies depending on the material and the film thickness of the doping region.
- the deposition rate ratio of the electron transport material and the donor compound is 10,000: It is preferable to use an electron transport layer by co-evaporation so as to be in the range of 1 to 2: 1.
- the deposition rate ratio is more preferably 100: 1 to 5: 1, and further preferably 100: 1 to 10: 1.
- the donor material is a complex of a metal and an organic material
- the electron transport layer and the donor material are co-deposited so that the deposition rate ratio of the electron transport material and the donor material is in the range of 100: 1 to 1: 100. Is preferred.
- the deposition rate ratio is more preferably 10: 1 to 1:10, and more preferably 7: 3 to 3: 7.
- the electron transport layer in which the light emitting device material of the present invention is doped with a donor material as described above may be used as a charge generation layer in a tandem structure type device connecting a plurality of light emitting devices.
- the method for improving the electron transport ability by doping a donor material into the electron transport layer is particularly effective when the thin film layer is thick. It is particularly preferably used when the total film thickness of the electron transport layer and the light emitting layer is 50 nm or more.
- the total film thickness of the electron transport layer and the light emitting layer is 50 nm or more.
- the total film thickness of the electron transport layer and the light-emitting layer is 50 nm or more, and in the case of long-wavelength light emission such as red, it may be a thick film near 100 nm. .
- the thickness of the electron transport layer to be doped may be a part or all of the electron transport layer.
- the donor material is in direct contact with the light emitting layer, it may adversely affect the light emission efficiency. In that case, it is preferable to provide a non-doped region at the light emitting layer / electron transport layer interface.
- an electron injection layer may be provided between the cathode and the electron transport layer.
- the electron injection layer is inserted for the purpose of assisting injection of electrons from the cathode to the electron transport layer, but in the case of insertion, a compound having a heteroaryl ring structure containing electron-accepting nitrogen may be used. Alternatively, a layer containing the above donor material may be used.
- the light emitting device material of the present invention may be contained in the electron injection layer.
- An insulator or a semiconductor inorganic substance can also be used for the electron injection layer. Use of these materials is preferable because a short circuit of the light emitting element can be effectively prevented and the electron injection property can be improved.
- an insulator it is preferable to use at least one metal compound selected from the group consisting of alkali metal chalcogenides, alkaline earth metal chalcogenides, alkali metal halides and alkaline earth metal halides. If the electron injection layer is composed of these alkali metal chalcogenides or the like, it is more preferable because the electron injection property can be further improved.
- preferred alkali metal chalcogenides include, for example, Li 2 O, Na 2 S, and Na 2 Se
- preferred alkaline earth metal chalcogenides include, for example, CaO, BaO, SrO, BeO, BaS, and CaSe. Is mentioned.
- preferable alkali metal halides include, for example, LiF, NaF, KF, LiCl, KCl, and NaCl.
- preferable alkaline earth metal halides include fluorides such as CaF 2 , BaF 2 , SrF 2 , MgF 2 and BeF 2 , and halides other than fluorides.
- a complex of an organic substance and a metal is also preferably used.
- a complex of an organic substance and a metal is used for the electron injection layer, it is more preferable because the film thickness can be easily adjusted.
- organometallic complexes include quinolinol, benzoquinolinol, pyridylphenol, flavonol, hydroxyimidazopyridine, hydroxybenzazole, hydroxytriazole and the like as preferred examples of the organic substance in a complex with an organic substance.
- a complex of an alkali metal and an organic substance is preferable, a complex of lithium and an organic substance is more preferable, and lithium quinolinol is particularly preferable.
- each layer constituting the light emitting element is not particularly limited, such as resistance heating vapor deposition, electron beam vapor deposition, sputtering, molecular lamination method, coating method, etc., but resistance heating vapor deposition or electron beam vapor deposition is usually used in terms of element characteristics. preferable.
- the thickness of the organic layer is not limited because it depends on the resistance value of the luminescent material, but is preferably 1 to 1000 nm.
- the film thicknesses of the light emitting layer, the electron transport layer, and the hole transport layer are each preferably 1 nm to 200 nm, and more preferably 5 nm to 100 nm.
- the light emitting element of the present invention has a function of converting electrical energy into light.
- a direct current is mainly used as the electric energy, but a pulse current or an alternating current can also be used.
- the current value and voltage value are not particularly limited, but should be selected so that the maximum luminance can be obtained with as low energy as possible in consideration of the power consumption and lifetime of the device.
- the light-emitting element of the present invention is suitably used as a display for displaying in a matrix and / or segment system, for example.
- pixels for display are arranged two-dimensionally such as a lattice shape or a mosaic shape, and characters and images are displayed by a set of pixels.
- the shape and size of the pixel are determined by the application. For example, a square pixel with a side of 300 ⁇ m or less is usually used for displaying images and characters on a personal computer, monitor, TV, and a pixel with a side of mm order for a large display such as a display panel. become.
- monochrome display pixels of the same color may be arranged. However, in color display, red, green, and blue pixels are displayed side by side. In this case, there are typically a delta type and a stripe type.
- the matrix driving method may be either a line sequential driving method or an active matrix. Although the structure of the line sequential drive is simple, the active matrix may be superior in consideration of the operation characteristics, and it is necessary to use it depending on the application.
- the segment system in the present invention is a system in which a pattern is formed so as to display predetermined information and a region determined by the arrangement of the pattern is caused to emit light.
- a pattern is formed so as to display predetermined information and a region determined by the arrangement of the pattern is caused to emit light.
- the time and temperature display in a digital clock or a thermometer the operation state display of an audio device or an electromagnetic cooker, the panel display of an automobile, etc.
- the matrix display and the segment display may coexist in the same panel.
- the light-emitting element of the present invention is also preferably used as a backlight for various devices.
- the backlight is used mainly for the purpose of improving the visibility of a display device that does not emit light, and is used for a liquid crystal display device, a clock, an audio device, an automobile panel, a display panel, a sign, and the like.
- the light-emitting element of the present invention is preferably used for a backlight for a liquid crystal display device, particularly a personal computer for which a reduction in thickness is being considered, and a backlight that is thinner and lighter than conventional ones can be provided.
- Synthesis example 1 Synthesis of Compound [1] 14.0 g of acenaphthylene, 25.0 g of diphenylisobenzofuran and 200 ml of o-xylene were mixed and heated to reflux under a nitrogen stream. After 2 hours, after cooling to room temperature, the solvent was distilled off and 300 mL of ether was added. The resulting precipitate was filtered and vacuum dried to obtain 27.7 g of intermediate A (yield 71%).
- intermediate E19.4 g, potassium acetate 9.6 g, and dimethylformamide 82 mL were mixed and purged with nitrogen.
- To this mixed solution were added 0.29 g of palladium acetate and 0.85 g of triphenylphosphine, and the mixture was heated to reflux. After 3 hours, after cooling to room temperature, 300 mL of water was added. Aqueous potassium hydroxide was added until basic, and the precipitate was filtered and dried in a vacuum dryer. The obtained solid was recrystallized with butyl acetate, filtered, and then vacuum-dried to obtain 11.0 g of Intermediate F (yield 77%).
- Compound [1] was used as a light emitting device material after sublimation purification at about 340 ° C. under a pressure of 1 ⁇ 10 ⁇ 3 Pa using an oil diffusion pump.
- the HPLC purity (area% at a measurement wavelength of 254 nm) was 99.9% before sublimation purification and 99.9% after sublimation purification.
- Example 1 A glass substrate (manufactured by Geomat Co., Ltd., 11 ⁇ / ⁇ , sputtered product) on which ITO transparent conductive film was deposited at 165 nm was cut into 38 ⁇ 46 mm and etched. The obtained substrate was ultrasonically cleaned with “Semico Clean 56” (trade name, manufactured by Furuuchi Chemical Co., Ltd.) for 15 minutes and then with ultrapure water. This substrate was subjected to UV-ozone treatment for 1 hour immediately before producing the device, placed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus became 5 ⁇ 10 ⁇ 4 Pa or less.
- “Semico Clean 56” trade name, manufactured by Furuuchi Chemical Co., Ltd.
- HAT-CN6 was deposited as a hole injection layer at a thickness of 5 nm and HT-1 as a hole transport layer was deposited at a thickness of 80 nm by a resistance heating method.
- a host material H-1 and a dopant material D-1 were vapor-deposited to a thickness of 40 nm as a light emitting layer so that the doping concentration was 5% by weight.
- Compound [1] was deposited as an electron transport layer to a thickness of 30 nm and laminated.
- 1000 nm of aluminum was vapor-deposited to form a cathode, and a 5 ⁇ 5 mm square device was fabricated.
- the film thickness referred to here is a crystal oscillation type film thickness monitor display value.
- the characteristics of this light emitting element at 1000 cd / m 2 were a driving voltage of 4.6 V and an external quantum efficiency of 4.8%. Further, when the initial luminance was set to 1000 cd / m 2 and driving at constant current, the luminance half time for decreasing the luminance by 50% was 1100 hours.
- HAT-CN6, HT-1, H-1, and D-1 are the compounds shown below.
- Examples 2 to 17 A light emitting device was prepared and evaluated in the same manner as in Example 1 except that the compounds listed in Table 1 were used for the electron transport layer. The results are shown in Table 1. Compounds [2] to [17] are the compounds shown below.
- Comparative Examples 1-6 A light emitting device was prepared and evaluated in the same manner as in Example 1 except that the compounds listed in Table 1 were used for the electron transport layer. The results are shown in Table 1. E-1 to E-6 are the compounds shown below.
- Example 18 A glass substrate (manufactured by Geomat Co., Ltd., 11 ⁇ / ⁇ , sputtered product) on which ITO transparent conductive film was deposited at 165 nm was cut into 38 ⁇ 46 mm and etched. The obtained substrate was ultrasonically cleaned with “Semico Clean 56” (trade name, manufactured by Furuuchi Chemical Co., Ltd.) for 15 minutes and then with ultrapure water. This substrate was subjected to UV-ozone treatment for 1 hour immediately before producing the device, placed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus became 5 ⁇ 10 ⁇ 4 Pa or less.
- “Semico Clean 56” trade name, manufactured by Furuuchi Chemical Co., Ltd.
- HAT-CN6 was deposited as a hole injection layer at a thickness of 5 nm and HT-1 as a hole transport layer was deposited at a thickness of 80 nm by a resistance heating method.
- a host material H-1 and a dopant material D-1 were vapor-deposited to a thickness of 40 nm as a light emitting layer so that the doping concentration was 5% by weight.
- the compound [1] was deposited to a thickness of 10 nm as a first electron transport layer and laminated.
- compound [1] is used as the second electron transporting layer as the electron transporting material
- cesium is used as the donor material
- the deposition rate ratio of compound [1] and cesium is 20: 1 so that the thickness is 20 nm. did.
- 1000 nm of aluminum was vapor-deposited to form a cathode, and a 5 ⁇ 5 mm square device was fabricated.
- the characteristics of this light emitting element at 1000 cd / m 2 were a driving voltage of 4.2 V and an external quantum efficiency of 5.6%.
- the luminance half time for decreasing the luminance by 50% was 1500 hours.
- Examples 19-34 A light emitting device was prepared and evaluated in the same manner as in Example 18 except that the compounds shown in Table 2 were used for the electron transport layer. The results are shown in Table 2.
- Comparative Examples 7-12 A light emitting device was prepared and evaluated in the same manner as in Example 18 except that the compounds shown in Table 2 were used for the electron transport layer. The results are shown in Table 2.
- Example 35 A glass substrate (manufactured by Geomat Co., Ltd., 11 ⁇ / ⁇ , sputtered product) on which ITO transparent conductive film was deposited at 165 nm was cut into 38 ⁇ 46 mm and etched. The obtained substrate was ultrasonically cleaned with “Semico Clean 56” (trade name, manufactured by Furuuchi Chemical Co., Ltd.) for 15 minutes and then with ultrapure water. This substrate was subjected to UV-ozone treatment for 1 hour immediately before producing the device, placed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus became 5 ⁇ 10 ⁇ 4 Pa or less.
- “Semico Clean 56” trade name, manufactured by Furuuchi Chemical Co., Ltd.
- HAT-CN6 was deposited as a hole injection layer at a thickness of 5 nm and HT-1 as a hole transport layer was deposited at a thickness of 80 nm by a resistance heating method.
- a host material H-1 and a dopant material D-1 were vapor-deposited to a thickness of 40 nm as a light emitting layer so that the doping concentration was 5% by weight.
- the compound [1] is used as the electron transport material for the electron transport layer
- 2E-1 is used as the donor material
- the thickness of the compound [1] and 2E-1 is set to 30 nm so that the deposition rate ratio is 1: 1.
- Laminated. This electron transport layer is shown as a second electron transport layer in Table 2.
- Examples 36-51 A light emitting device was prepared and evaluated in the same manner as in Example 35 except that the compounds described in Table 3 were used as the electron transport layer and the donor material. The results are shown in Table 3. 2E-1 is a compound shown below.
- Comparative Examples 13-18 A light emitting device was prepared and evaluated in the same manner as in Example 35 except that the compounds described in Table 3 were used as the electron transport layer and the donor material. The results are shown in Table 3.
- Example 52 A glass substrate (manufactured by Geomat Co., Ltd., 11 ⁇ / ⁇ , sputtered product) on which ITO transparent conductive film was deposited at 165 nm was cut into 38 ⁇ 46 mm and etched. The obtained substrate was ultrasonically cleaned with “Semico Clean 56” (trade name, manufactured by Furuuchi Chemical Co., Ltd.) for 15 minutes and then with ultrapure water. This substrate was subjected to UV-ozone treatment for 1 hour immediately before producing the device, placed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus became 5 ⁇ 10 ⁇ 4 Pa or less.
- “Semico Clean 56” trade name, manufactured by Furuuchi Chemical Co., Ltd.
- HAT-CN6 was deposited as a hole injection layer at a thickness of 5 nm and HT-1 as a hole transport layer was deposited at a thickness of 80 nm by a resistance heating method. This hole transport layer is shown in Table 3 as the first hole transport layer.
- a host material H-2 and a dopant material D-2 were deposited to a thickness of 40 nm so that the doping concentration was 10 wt%.
- Compound [1] was deposited as an electron transport layer to a thickness of 30 nm and laminated.
- the film thickness referred to here is a crystal oscillation type film thickness monitor display value.
- the characteristics of this light emitting device at 4000 cd / m 2 were a driving voltage of 4.2 V and an external quantum efficiency of 12.1%.
- the luminance half time was 1200 hours.
- H-2 and D-2 are the compounds shown below.
- Example 53 A glass substrate (manufactured by Geomat Co., Ltd., 11 ⁇ / ⁇ , sputtered product) on which ITO transparent conductive film was deposited at 165 nm was cut into 38 ⁇ 46 mm and etched. The obtained substrate was ultrasonically cleaned with “Semico Clean 56” (trade name, manufactured by Furuuchi Chemical Co., Ltd.) for 15 minutes and then with ultrapure water. This substrate was subjected to UV-ozone treatment for 1 hour immediately before producing the device, placed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus became 5 ⁇ 10 ⁇ 4 Pa or less.
- “Semico Clean 56” trade name, manufactured by Furuuchi Chemical Co., Ltd.
- HAT-CN6 was deposited as a hole injection layer at 5 nm and HT-1 as a first hole transport layer was deposited at 70 nm by a resistance heating method. Furthermore, 10 nm of HT-2 was deposited as a second hole transport layer. Next, as a light emitting layer, a host material H-2 and a dopant material D-2 were deposited to a thickness of 40 nm so that the doping concentration was 10 wt%. Next, Compound [1] was deposited as an electron transport layer to a thickness of 30 nm and laminated.
- the film thickness referred to here is a crystal oscillation type film thickness monitor display value.
- the characteristics of this light emitting element at 4000 cd / m 2 were a driving voltage of 4.3 V and an external quantum efficiency of 14.2%.
- the luminance half time was 1700 hours.
- HT-2 is a compound shown below.
- Examples 54 and 55 A light emitting device was prepared and evaluated in the same manner as in Example 53 except that the compounds described in Table 4 were used as the second hole transport layer. The results are shown in Table 4.
- HT-3 and HT-4 are the compounds shown below.
- Example 56 A light emitting device was prepared and evaluated in the same manner as in Example 52 except that the compound [2] was used as the electron transport layer. The results are shown in Table 4.
- Examples 57-59 An element was prepared and evaluated in the same manner as in Example 53 except that the compounds shown in Table 4 were used as the second hole transport layer and the compound [2] was used as the electron transport layer. The results are shown in Table 4.
- Comparative Examples 19 and 23 A light emitting device was prepared and evaluated in the same manner as in Example 52 except that the compounds listed in Table 4 were used as the electron transport layer. The results are shown in Table 4.
- Comparative Examples 20-22, 24-26 A device was prepared and evaluated in the same manner as in Example 53 except that the compounds shown in Table 3 were used as the second hole transport layer and the electron transport layer. The results are shown in Table 4.
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Abstract
Description
化合物[1]の合成
アセナフチレン14.0g、ジフェニルイソベンゾフラン25.0gおよびo-キシレン200mlを混合し、窒素気流下で加熱還流した。2時間後、室温に冷ました後、溶媒を留去し、エーテル300mLを加えた。得られた析出物をろ過し、真空乾燥することにより、中間体A27.7g(収率71%)を得た。
化合物[1]: 1H-NMR (CDCl3(d=ppm)) δ 6.75(t,2H),7.22(dd,1H),7.34-7.54(m,7H),7.61-7.78(m,15H),7.83-7.99(m,4H),8.06(d,1H),8.27(dd,1H),8.51(d,1H),8.89(dd,1H)。
ITO透明導電膜を165nm堆積させたガラス基板(ジオマテック(株)製、11Ω/□、スパッタ品)を38×46mmに切断し、エッチングを行った。得られた基板を“セミコクリーン56”(商品名、フルウチ化学(株)製)で15分間超音波洗浄してから、超純水で洗浄した。この基板を素子を作製する直前に1時間UV-オゾン処理し、真空蒸着装置内に設置して、装置内の真空度が5×10-4Pa以下になるまで排気した。抵抗加熱法によって、まず正孔注入層として、HAT-CN6を5nm、正孔輸送層として、HT-1を80nm蒸着した。次に、発光層として、ホスト材料H-1、ドーパント材料D-1をドープ濃度が5重量%になるようにして40nmの厚さに蒸着した。次に、電子輸送層として化合物[1]を30nmの厚さに蒸着して積層した。次に、フッ化リチウムを0.5nm蒸着した後、アルミニウムを1000nm蒸着して陰極とし、5×5mm角の素子を作製した。ここで言う膜厚は、水晶発振式膜厚モニター表示値である。この発光素子の1000cd/m2時の特性は、駆動電圧4.6V、外部量子効率4.8%であった。また初期輝度を1000cd/m2に設定し、定電流駆動させたところ輝度50%低下する輝度半減時間は1100時間であった。なおHAT-CN6、HT-1、H-1、D-1は以下に示す化合物である。
電子輸送層に表1に記載した化合物を用いた以外は実施例1と同様にして発光素子を作成し、評価した。結果を表1に示す。なお、化合物[2]~[17]は下記に示す化合物である。
電子輸送層に表1に記載した化合物を用いた以外は実施例1と同様にして発光素子を作成し、評価した。結果を表1に示す。なお、E-1~E-6は以下に示す化合物である。
ITO透明導電膜を165nm堆積させたガラス基板(ジオマテック(株)製、11Ω/□、スパッタ品)を38×46mmに切断し、エッチングを行った。得られた基板を“セミコクリーン56”(商品名、フルウチ化学(株)製)で15分間超音波洗浄してから、超純水で洗浄した。この基板を素子を作製する直前に1時間UV-オゾン処理し、真空蒸着装置内に設置して、装置内の真空度が5×10-4Pa以下になるまで排気した。抵抗加熱法によって、まず正孔注入層として、HAT-CN6を5nm、正孔輸送層として、HT-1を80nm蒸着した。次に、発光層として、ホスト材料H-1、ドーパント材料D-1をドープ濃度が5重量%になるようにして40nmの厚さに蒸着した。次に、第1電子輸送層として化合物[1]を10nmの厚さに蒸着して積層した。さらに第2電子輸送層として電子輸送材料に化合物[1]を、ドナー性材料としてセシウムを用い、化合物[1]とセシウムの蒸着速度比が20:1になるようにして20nmの厚さに積層した。次に、フッ化リチウムを0.5nm蒸着した後、アルミニウムを1000nm蒸着して陰極とし、5×5mm角の素子を作製した。この発光素子の1000cd/m2時の特性は、駆動電圧4.2V、外部量子効率5.6%であった。また初期輝度を1000cd/m2に設定し、定電流駆動させたところ輝度50%低下する輝度半減時間は1500時間であった。
電子輸送層に表2に記載した化合物を用いた以外は実施例18と同様にして発光素子を作成し、評価した。結果を表2に示す。
電子輸送層に表2に記載した化合物を用いた以外は実施例18と同様にして発光素子を作成し、評価した。結果を表2に示す。
ITO透明導電膜を165nm堆積させたガラス基板(ジオマテック(株)製、11Ω/□、スパッタ品)を38×46mmに切断し、エッチングを行った。得られた基板を“セミコクリーン56”(商品名、フルウチ化学(株)製)で15分間超音波洗浄してから、超純水で洗浄した。この基板を素子を作製する直前に1時間UV-オゾン処理し、真空蒸着装置内に設置して、装置内の真空度が5×10-4Pa以下になるまで排気した。抵抗加熱法によって、まず正孔注入層として、HAT-CN6を5nm、正孔輸送層として、HT-1を80nm蒸着した。次に、発光層として、ホスト材料H-1、ドーパント材料D-1をドープ濃度が5重量%になるようにして40nmの厚さに蒸着した。さらに電子輸送層として電子輸送材料に化合物[1]を、ドナー性材料として2E-1を用い、化合物[1]と2E-1の蒸着速度比が1:1になるようにして30nmの厚さに積層した。この電子輸送層は表2では第2電子輸送層として示す。次に、フッ化リチウムを0.5nm蒸着した後、アルミニウムを1000nm蒸着して陰極とし、5×5mm角の素子を作製した。この発光素子の1000cd/m2時の特性は、駆動電圧3.9V、外部量子効率6.0%であった。また初期輝度を1000cd/m2に設定し、定電流駆動させたところ輝度50%低下する輝度半減時間は1800時間であった。
電子輸送層、ドナー性材料として表3に記載した化合物を用いた以外は実施例35と同様にして発光素子を作成し、評価した。結果を表3に示す。2E-1は下記に示す化合物である。
電子輸送層、ドナー性材料として表3に記載した化合物を用いた以外は実施例35と同様にして発光素子を作成し、評価した。結果を表3に示す。
ITO透明導電膜を165nm堆積させたガラス基板(ジオマテック(株)製、11Ω/□、スパッタ品)を38×46mmに切断し、エッチングを行った。得られた基板を“セミコクリーン56”(商品名、フルウチ化学(株)製)で15分間超音波洗浄してから、超純水で洗浄した。この基板を素子を作製する直前に1時間UV-オゾン処理し、真空蒸着装置内に設置して、装置内の真空度が5×10-4Pa以下になるまで排気した。抵抗加熱法によって、まず正孔注入層として、HAT-CN6を5nm、正孔輸送層として、HT-1を80nm蒸着した。この正孔輸送層は表3では第1正孔輸送層として示す。次に、発光層として、ホスト材料H-2、ドーパント材料D-2をドープ濃度が10重量%になるようにして40nmの厚さに蒸着した。次に、電子輸送層として化合物[1]を30nmの厚さに蒸着して積層した。次に、フッ化リチウムを0.5nm蒸着した後、アルミニウムを1000nm蒸着して陰極とし、5×5mm角の素子を作製した。ここで言う膜厚は、水晶発振式膜厚モニター表示値である。この発光素子の4000cd/m2時の特性は、駆動電圧4.2V、外部量子効率12.1%であった。また初期輝度を4000cd/m2に設定し、定電流駆動させたところ輝度半減時間は1200時間であった。なおH-2、D-2は以下に示す化合物である。
ITO透明導電膜を165nm堆積させたガラス基板(ジオマテック(株)製、11Ω/□、スパッタ品)を38×46mmに切断し、エッチングを行った。得られた基板を“セミコクリーン56”(商品名、フルウチ化学(株)製)で15分間超音波洗浄してから、超純水で洗浄した。この基板を素子を作製する直前に1時間UV-オゾン処理し、真空蒸着装置内に設置して、装置内の真空度が5×10-4Pa以下になるまで排気した。抵抗加熱法によって、まず正孔注入層として、HAT-CN6を5nm、第1正孔輸送層として、HT-1を70nm蒸着した。さらに第2正孔輸送層としてHT-2を10nm蒸着した。次に、発光層として、ホスト材料H-2、ドーパント材料D-2をドープ濃度が10重量%になるようにして40nmの厚さに蒸着した。次に、電子輸送層として化合物[1]を30nmの厚さに蒸着して積層した。次に、フッ化リチウムを0.5nm蒸着した後、アルミニウムを1000nm蒸着して陰極とし、5×5mm角の素子を作製した。ここで言う膜厚は、水晶発振式膜厚モニター表示値である。この発光素子の4000cd/m2時の特性は、駆動電圧4.3V、外部量子効率14.2%であった。また初期輝度を4000cd/m2に設定し、定電流駆動させたところ輝度半減時間は1700時間であった。なお、HT-2は以下に示す化合物である。
第2正孔輸送層として表4に記載した化合物を用いた以外は、実施例53と同様にして発光素子を作成し、評価した。結果を表4に示す。なおHT-3、HT-4は以下に示す化合物である。
電子輸送層として化合物[2]を用いた以外は実施例52と同様に発光素子を作成し、評価した。結果を表4に示す。
第2正孔輸送層として表4記載の化合物を用い、電子輸送層として化合物[2]を用いた以外は、実施例53と同様にして素子を作成し、評価した。結果を表4に示す。
電子輸送層として表4記載の化合物を用いた以外は実施例52と同様に発光素子を作成し、評価した。結果を表4に示す。
第2正孔輸送層および電子輸送層として表3記載の化合物を用いた以外は、実施例53と同様にして素子を作成し、評価した。結果を表4に示す。
Claims (15)
- 下記一般式(1)で表される化合物を有することを特徴とする発光素子材料。
- nが1である請求項1に記載の発光素子材料。
- R8およびR13が置換もしくは無置換のアリール基である請求項2に記載の発光素子材料。
- R8およびR13がフェニル基である請求項5に記載の発光素子材料。
- Zが下記一般式(5)~(9)のいずれかで表される請求項1~6のいずれかに記載の発光素子材料。
- 環Bが下記一般式(10)~(13)のいずれかで表される構造である請求項7記載の発光素子材料。
- 陽極と陰極の間に有機層が存在し、電気エネルギーにより発光する発光素子であって、前記有機層に請求項1~8のいずれか記載の発光素子材料を含有することを特徴とする発光素子。
- 前記有機層が電子輸送層を含み、前記請求項1~8のいずれか記載の発光素子材料が前記電子輸送層に含まれる請求項9記載の発光素子。
- 前記電子輸送層がさらにドナー性材料を含む請求項10記載の発光素子。
- 前記ドナー性材料がアルカリ金属、アルカリ金属を含有する無機塩、アルカリ金属と有機物との錯体、アルカリ土類金属、アルカリ土類金属を含有する無機塩またはアルカリ土類金属と有機物との錯体である請求項11記載の発光素子。
- 前記ドナー性材料がアルカリ金属と有機物との錯体またはアルカリ土類金属と有機物との錯体である請求項12記載の発光素子。
- 陽極と陰極の間にさらに正孔輸送層を含み、前記正孔輸送層がカルバゾール骨格を有する材料を含有する請求項9~13のいずれか記載の発光素子。
- 前記カルバゾール骨格を有する材料がカルバゾール多量体である請求項14記載の発光素子。
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WO2015182547A1 (ja) * | 2014-05-28 | 2015-12-03 | 東レ株式会社 | フルオランテン誘導体、それを含有する電子デバイス、発光素子および光電変換素子 |
WO2016163372A1 (ja) * | 2015-04-08 | 2016-10-13 | 出光興産株式会社 | 化合物、これを用いた有機エレクトロルミネッセンス素子用材料、及びこれを用いた有機エレクトロルミネッセンス素子並びに電子機器 |
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CN111233826A (zh) * | 2018-11-29 | 2020-06-05 | 昱镭光电科技股份有限公司 | 含荧蒽基的二苯并噻吩化合物及其有机电致发光器件 |
WO2021020872A1 (ko) * | 2019-07-31 | 2021-02-04 | 덕산네오룩스 주식회사 | 유기전기 소자용 화합물, 이를 이용한 유기전기소자 및 그 전자 장치 |
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KR20150121400A (ko) * | 2014-04-18 | 2015-10-29 | (주)더블유에스 | 플루오란텐 유도체 및 이를 포함한 유기 전계발광 소자 |
KR101581948B1 (ko) * | 2014-04-18 | 2016-01-04 | (주)더블유에스 | 플루오란텐 유도체 및 이를 포함한 유기 전계발광 소자 |
WO2015182547A1 (ja) * | 2014-05-28 | 2015-12-03 | 東レ株式会社 | フルオランテン誘導体、それを含有する電子デバイス、発光素子および光電変換素子 |
CN106458899A (zh) * | 2014-05-28 | 2017-02-22 | 东丽株式会社 | 荧蒽衍生物、含有其的电子设备、发光元件及光电转换元件 |
JPWO2015182547A1 (ja) * | 2014-05-28 | 2017-04-20 | 東レ株式会社 | フルオランテン誘導体、それを含有する電子デバイス、発光素子および光電変換素子 |
WO2016163372A1 (ja) * | 2015-04-08 | 2016-10-13 | 出光興産株式会社 | 化合物、これを用いた有機エレクトロルミネッセンス素子用材料、及びこれを用いた有機エレクトロルミネッセンス素子並びに電子機器 |
US10629821B2 (en) | 2015-04-08 | 2020-04-21 | Idemitsu Kosan Co., Ltd. | Compound, material for organic electroluminescent elements using same, and organic electroluminescent element and electronic device each using same |
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JP6269060B2 (ja) | 2018-01-31 |
EP2860784B1 (en) | 2016-11-02 |
KR20150029617A (ko) | 2015-03-18 |
EP2860784A4 (en) | 2015-12-09 |
JPWO2013187258A1 (ja) | 2016-02-04 |
KR102102620B1 (ko) | 2020-04-21 |
CN104350627B (zh) | 2016-05-18 |
EP2860784A1 (en) | 2015-04-15 |
TW201402571A (zh) | 2014-01-16 |
CN104350627A (zh) | 2015-02-11 |
TWI558705B (zh) | 2016-11-21 |
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