WO2019013063A1 - 発光素子、それを含むディスプレイ、照明装置およびセンサ - Google Patents
発光素子、それを含むディスプレイ、照明装置およびセンサ Download PDFInfo
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- WO2019013063A1 WO2019013063A1 PCT/JP2018/025323 JP2018025323W WO2019013063A1 WO 2019013063 A1 WO2019013063 A1 WO 2019013063A1 JP 2018025323 W JP2018025323 W JP 2018025323W WO 2019013063 A1 WO2019013063 A1 WO 2019013063A1
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- light emitting
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- emitting device
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- 150000002469 indenes Chemical class 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PSCMQHVBLHHWTO-UHFFFAOYSA-K indium(iii) chloride Chemical compound Cl[In](Cl)Cl PSCMQHVBLHHWTO-UHFFFAOYSA-K 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- PZOUSPYUWWUPPK-UHFFFAOYSA-N indole Natural products CC1=CC=CC2=C1C=CN2 PZOUSPYUWWUPPK-UHFFFAOYSA-N 0.000 description 1
- RKJUIXBNRJVNHR-UHFFFAOYSA-N indolenine Natural products C1=CC=C2CC=NC2=C1 RKJUIXBNRJVNHR-UHFFFAOYSA-N 0.000 description 1
- 150000002475 indoles Chemical class 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 230000009878 intermolecular interaction Effects 0.000 description 1
- 229940079865 intestinal antiinfectives imidazole derivative Drugs 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 125000000040 m-tolyl group Chemical group [H]C1=C([H])C(*)=C([H])C(=C1[H])C([H])([H])[H] 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001510 metal chloride Inorganic materials 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 1
- YPJRZWDWVBNDIW-UHFFFAOYSA-N n,n-diphenyl-4-[2-[4-[4-[2-[4-(n-phenylanilino)phenyl]ethenyl]phenyl]phenyl]ethenyl]aniline Chemical group C=1C=C(N(C=2C=CC=CC=2)C=2C=CC=CC=2)C=CC=1C=CC(C=C1)=CC=C1C(C=C1)=CC=C1C=CC(C=C1)=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 YPJRZWDWVBNDIW-UHFFFAOYSA-N 0.000 description 1
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical group C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 1
- 125000004593 naphthyridinyl group Chemical group N1=C(C=CC2=CC=CN=C12)* 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
- 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
- WKGDNXBDNLZSKC-UHFFFAOYSA-N oxido(phenyl)phosphanium Chemical compound O=[PH2]c1ccccc1 WKGDNXBDNLZSKC-UHFFFAOYSA-N 0.000 description 1
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 1
- 125000006340 pentafluoro ethyl group Chemical group FC(F)(F)C(F)(F)* 0.000 description 1
- 125000000538 pentafluorophenyl group Chemical group FC1=C(F)C(F)=C(*)C(F)=C1F 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- DGBWPZSGHAXYGK-UHFFFAOYSA-N perinone Chemical class C12=NC3=CC=CC=C3N2C(=O)C2=CC=C3C4=C2C1=CC=C4C(=O)N1C2=CC=CC=C2N=C13 DGBWPZSGHAXYGK-UHFFFAOYSA-N 0.000 description 1
- 125000001792 phenanthrenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C=CC12)* 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
- LFGREXWGYUGZLY-UHFFFAOYSA-N phosphoryl Chemical class [P]=O LFGREXWGYUGZLY-UHFFFAOYSA-N 0.000 description 1
- LFSXCDWNBUNEEM-UHFFFAOYSA-N phthalazine Chemical compound C1=NN=CC2=CC=CC=C21 LFSXCDWNBUNEEM-UHFFFAOYSA-N 0.000 description 1
- 125000004592 phthalazinyl group Chemical group C1(=NN=CC2=CC=CC=C12)* 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 125000003386 piperidinyl group Chemical group 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000553 poly(phenylenevinylene) Polymers 0.000 description 1
- 229920000548 poly(silane) polymer Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 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
- 150000003141 primary amines Chemical class 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 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
- 150000003219 pyrazolines Chemical class 0.000 description 1
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical group C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 1
- 229940083082 pyrimidine derivative acting on arteriolar smooth muscle Drugs 0.000 description 1
- 150000003230 pyrimidines Chemical class 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
- 150000005255 pyrrolopyridines Chemical class 0.000 description 1
- LISFMEBWQUVKPJ-UHFFFAOYSA-N quinolin-2-ol Chemical compound C1=CC=C2NC(=O)C=CC2=C1 LISFMEBWQUVKPJ-UHFFFAOYSA-N 0.000 description 1
- 150000004322 quinolinols Chemical class 0.000 description 1
- 150000004059 quinone derivatives Chemical class 0.000 description 1
- 150000004053 quinones Chemical class 0.000 description 1
- 150000003252 quinoxalines Chemical class 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002441 reversible effect Effects 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
- 125000006413 ring segment Chemical group 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
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- 125000000467 secondary amino group Chemical class [H]N([*:1])[*:2] 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 150000003377 silicon compounds Chemical group 0.000 description 1
- 239000000377 silicon dioxide 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
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 125000003003 spiro group Chemical group 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
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229940042055 systemic antimycotics triazole derivative Drugs 0.000 description 1
- 125000001981 tert-butyldimethylsilyl group Chemical group [H]C([H])([H])[Si]([H])(C([H])([H])[H])[*]C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000000037 tert-butyldiphenylsilyl group Chemical group [H]C1=C([H])C([H])=C([H])C([H])=C1[Si]([H])([*]C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H])C1=C([H])C([H])=C([H])C([H])=C1[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
- 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
- 150000007979 thiazole derivatives Chemical class 0.000 description 1
- 229930192474 thiophene Natural products 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
- 230000007704 transition Effects 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- 125000005259 triarylamine group Chemical group 0.000 description 1
- 125000006387 trifluoromethyl pyridyl group Chemical group 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 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
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Classifications
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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
- H10K85/30—Coordination compounds
- H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
- H10K85/322—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising boron
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
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- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
- C07D413/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing three or more hetero rings
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
- C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
- C07D403/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
- C07D403/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing three or more hetero rings
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- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
- C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
- C07D487/04—Ortho-condensed systems
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/022—Boron compounds without C-boron linkages
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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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- 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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- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
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- 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
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
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- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/20—Delayed fluorescence emission
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- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/90—Multiple hosts in the emissive layer
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- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/302—Details of OLEDs of OLED structures
- H10K2102/3023—Direction of light emission
- H10K2102/3026—Top emission
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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]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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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
- H10K50/15—Hole transporting layers
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- H—ELECTRICITY
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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
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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]
- H10K50/19—Tandem OLEDs
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
Definitions
- the present invention relates to a light emitting element, a display including the same, a lighting device and a sensor.
- the organic thin film light emitting element emits light when electrons injected from the cathode and holes injected from the anode recombine within the light emitting material in the organic layer sandwiched between the electrodes.
- This light-emitting element is characterized by being thin, emitting light with high luminance under a low driving voltage, and capable of emitting multiple colors by selecting a light-emitting material, and has attracted attention.
- TADF Thermally Activated Delayed Fluorescence
- Non-Patent Document 1 discloses a fluorescent organic thin film light emitting device using a TADF material as a dopant material of a light emitting layer.
- the use of the TADF dopant achieves higher luminous efficiency than the conventional fluorescent organic thin film light emitting device.
- TADF dopants emit light with a wide half-width, problems remain in terms of color purity.
- Non-Patent Document 2 discloses a fluorescent organic thin film light emitting device in which a TADF material is mixed in a light emitting layer. In this case, the triplet excitons are converted to singlet excitons by the TADF material, and then the fluorescent dopant receives the singlet excitons to achieve high luminous efficiency.
- problems still remain such as the efficiency of delivery of singlet excitons from TADF materials to fluorescent dopants, and the color purity of light emission.
- Patent Document 1 also discloses a fluorescent organic thin film light emitting device in which a light emitting layer contains a TADF material and a fluorescent dopant.
- a light emitting layer including a first host material having TADF properties, a second host material, and a fluorescent dopant material
- the magnitude relationship between the singlet energy of those materials and the magnitude of the energy difference Preferred relationships are disclosed.
- problems still remain in the efficiency of delivery of singlet excitons from the TADF material to the fluorescent dopant and the color purity of light emission.
- An object of the present invention is to solve the problems of the prior art and to provide an organic thin film light emitting device in which high light emission efficiency and light emission with high color purity are compatible.
- the present invention is a light emitting device having a plurality of organic layers including a light emitting layer between an anode and a cathode and emitting light by electrical energy, wherein the light emitting layer is represented by the general formula (1) It is a light emitting device containing a compound and a delayed fluorescence compound.
- an organic thin film light emitting device in which high light emission efficiency and light emission with high color purity are compatible.
- a light emitting device is a light emitting device having a plurality of organic layers including a light emitting layer between an anode and a cathode, and emitting light by electrical energy, wherein the light emitting layer is a general one described later.
- the compound represented by Formula (1) and the compound of delayed fluorescence are included.
- R 1 to R 9 which may be the same or different, each represents a hydrogen atom, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a thiol group, an alkoxy group or an alkylthio group
- —P ( O) R 10 R 11 and selected from fused rings and aliphatic rings formed between adjacent substituents.
- R 10 and R 11 are an aryl group or a heteroaryl group.
- hydrogen may be deuterium.
- a substituted or unsubstituted aryl group having 6 to 40 carbon atoms has 6 to 40 carbon atoms in all, including the number of carbon atoms contained in the substituent substituted on the aryl group. .
- the other substituents that define the carbon number are also the same as this.
- an alkyl group, a cycloalkyl group, a heterocyclic group an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a thiol group, an alkoxy group, an alkylthio group
- —P ( O)
- R 10 R 11 is preferable, and further, specific substituents which are preferable in the description of each substituent are preferable.
- R 10 and R 11 are an aryl group or a heteroaryl group. Moreover, these substituents may be further substituted by the above-mentioned
- the alkyl group is, for example, a saturated aliphatic hydrocarbon group such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group and the like, and this is a substituent group Or may not have.
- the carbon number 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 is, for example, a saturated alicyclic hydrocarbon group such as a cyclopropyl group, a cyclohexyl group, a norbornyl group, an adamantyl group and the like, which may or may not have a substituent.
- the carbon number of the alkyl group moiety is not particularly limited, but preferably in the range of 3 or more and 20 or less.
- the heterocyclic group means, for example, an aliphatic ring having an atom other than carbon in the ring, such as a pyran ring, a piperidine ring, a cyclic amide, etc., which may or may not have a substituent. .
- the carbon number of the heterocyclic group is not particularly limited, but preferably in the range of 2 or more and 20 or less.
- the alkenyl group means, for example, 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.
- the number of carbon atoms in the alkenyl group is not particularly limited, but is preferably in the range of 2 or more and 20 or less.
- the cycloalkenyl group means, for example, an unsaturated alicyclic hydrocarbon group containing a double bond such as cyclopentenyl group, cyclopentadienyl group, cyclohexenyl group and the like, which may have a substituent even if it has a substituent. You do not 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 in the alkynyl group is not particularly limited, but is preferably in the range of 2 or more and 20 or less.
- the alkoxy group indicates a functional group in which an aliphatic hydrocarbon group is bonded via an ether bond such as, for example, a methoxy group, an ethoxy group and a propoxy group, and this aliphatic hydrocarbon group may have a substituent You do not need to have it.
- the carbon number of the alkoxy group is not particularly limited, but is preferably in the range of 1 or more and 20 or less.
- the alkylthio group is one in which the oxygen atom of the ether bond of the alkoxy group is substituted by a sulfur atom.
- the hydrocarbon group of the alkylthio group may or may not have a substituent.
- the carbon number of the alkylthio group is not particularly limited, but is preferably in the range of 1 or more and 20 or less.
- the aryl ether group refers to, for example, a functional group having an aromatic hydrocarbon group bonded via an ether bond such as phenoxy group, and the aromatic hydrocarbon group may or may not have a substituent. Good.
- the carbon number of the aryl ether group is not particularly limited, but is preferably in the range of 6 or more and 40 or less.
- the arylthioether group is one in which the oxygen atom of the ether bond of the arylether group is substituted by a sulfur atom.
- the aromatic hydrocarbon group in the arylthioether group may or may not have a substituent.
- the carbon number of the arylthioether group is not particularly limited, but preferably in the range of 6 or more and 40 or less.
- the aryl group is, for example, phenyl group, biphenyl group, terphenyl group, naphthyl group, fluorenyl group, benzofluorenyl group, dibenzofluorenyl group, phenanthryl group, anthracenyl group, benzophenanthryl group, benzoanthrase It shows aromatic hydrocarbon groups such as nyl group, chrysenyl group, pyrenyl group, fluoranthenyl group, triphenylenyl group, benzofluoranthenyl group, dibenzoanthracenyl group, perylenyl group, helicenyl group and the like.
- phenyl group biphenyl group, terphenyl group, naphthyl group, fluorenyl group, phenanthryl group, anthracenyl group, pyrenyl group, fluoranthenyl group and triphenylenyl group are preferable.
- the aryl group may or may not have a substituent.
- the number of carbon atoms in the aryl group is not particularly limited, but is preferably in the range of 6 to 40, and more preferably 6 to 30.
- the aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, an anthracenyl group, and a phenyl group or a biphenyl group
- a terphenyl group and a naphthyl group are more preferable, a phenyl group, a biphenyl group and a terphenyl group are more preferable, and a phenyl group is particularly preferable.
- the aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, an anthracenyl group, and a phenyl group, a biphenyl group,
- the phenyl group and the naphthyl group are more preferable, and the phenyl group is particularly preferable.
- heteroaryl group examples include pyridyl group, furanyl group, thienyl group, quinolinyl group, isoquinolinyl group, pyrazinyl group, pyrimidyl group, pyridazinyl group, pyridazinyl group, triazinyl group, naphthyridinyl group, cinnolynyl group, phthalazinyl group, quinoxalinyl group, quinazolinyl group Benzofuranyl group, benzothienyl group, indolyl group, dibenzofuranyl group, dibenzothienyl group, carbazolyl group, benzocarbazolyl group, carborinyl group, indolocarbazolyl group, benzofurocarbazolyl group, benzothienocarbazolyl group Group, dihydroindenocarbazolyl group, benzoquinolinyl group, acridinyl group
- Atoms other than carbon shows a cyclic aromatic group having a single or a plurality of rings.
- the naphthylidinyl group means any of 1,5-naphthylidinyl group, 1,6-naphthylidinyl group, 1,7-naphthylidinyl group, 1,8-naphthylidinyl group, 2,6-naphthylidinyl group, 2,7-naphthylidinyl group Indicate
- the heteroaryl group may or may not have a substituent.
- the carbon number of the heteroaryl group is not particularly limited, but preferably 2 or more and 40 or less, more preferably 2 or more and 30 or less.
- R 1 to R 9 are a substituted or unsubstituted heteroaryl group
- examples of the heteroaryl group include pyridyl group, furanyl group, thienyl group, quinolinyl group, pyrimidyl group, triazinyl group, benzofuranyl group, benzothienyl group, indolyl Group, dibenzofuranyl group, dibenzothienyl group, carbazolyl group, benzoimidazolyl group, imidazopyridyl group, benzoxazolyl group, benzothiazolyl group, phenanthrolinyl group is preferable, and pyridyl group, furanyl group, thienyl group, quinolinyl group More preferred is pyridyl group.
- heteroaryl group examples include pyridyl, furanyl, thienyl, quinolinyl, pyrimidyl, triazinyl, benzofuranyl, benzothienyl, indolyl and dibenzo.
- Furanyl group, dibenzothienyl group, carbazolyl group, benzimidazolyl group, imidazopyridyl group, benzoxazolyl group, benzothiazolyl group, phenanthrolinyl group is preferable, and pyridyl group, furanyl group, thienyl group, quinolinyl group is more preferable, Pyridyl is particularly preferred.
- the electron-accepting nitrogen in the case of “contains an electron-accepting nitrogen” refers to a nitrogen atom which forms a multiple bond with an adjacent atom.
- the aromatic heterocyclic ring containing an electron accepting nitrogen is, for example, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, an oxadiazole ring, a thiazole ring, a quinoline ring, an isoquinoline ring, a naphthyridine ring, a cinnoline ring, phthalazine And rings, quinazoline rings, quinoxaline rings, benzoquinoline rings, phenanthroline rings, acridine rings, benzothiazole rings, benzoxazole rings, and the like.
- naphthyridine refers to any one of 1,5-naphthyridine, 1,6-naphthyridine, 1,7-naphthyridine, 1,8-naphthyridine, 2,6-naphthyridine, and 2,7-naphthyridine.
- Electron-donating nitrogen in the case of "including electron-donating nitrogen” refers to a nitrogen atom which forms only a single bond with an adjacent atom.
- Examples of the heteroaromatic ring containing an electron donating nitrogen include heteroaromatic rings having a pyrrole ring.
- the aromatic heterocyclic ring having a pyrrole ring includes a pyrrole ring, an indole ring, a carbazole ring and the like.
- Halogen is an atom selected from fluorine, chlorine, bromine and iodine.
- the carbonyl group, the carboxyl group, the ester group and the carbamoyl group may or may not have a substituent.
- a substituent an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group etc. are mentioned, for example, These substituents may be further substituted.
- the amino group is a substituted or unsubstituted amino group.
- substituents include an aryl group, a heteroaryl group, a linear alkyl group, a branched alkyl group and the like.
- the aryl group and the heteroaryl group are preferably a phenyl group, a naphthyl group, a pyridyl group and a quinolinyl group. These substituents may be further substituted.
- the carbon number of the substituent part of the amino group is not particularly limited, but is preferably 2 or more and 50 or less, more preferably 6 or more and 40 or less, and particularly preferably 6 or more and 30 or less.
- the silyl group is, for example, an alkylsilyl group such as trimethylsilyl group, triethylsilyl group, tert-butyldimethylsilyl group, propyldimethylsilyl group, vinyldimethylsilyl group, phenyldimethylsilyl group, tert-butyldiphenylsilyl group, tri It shows an arylsilyl group such as a phenylsilyl group and a trinaphthylsilyl group.
- the substituent on the silicon atom may be further substituted.
- the carbon number of the silyl group is not particularly limited, but preferably in the range of 1 or more and 30 or less.
- the siloxanyl group indicates a silicon compound group via an ether bond such as, for example, a trimethylsiloxanyl group.
- the substituent on the silicon atom may be further substituted.
- the boryl group is a substituted or unsubstituted boryl group.
- substituent in the case of substitution include an aryl group, a heteroaryl group, a linear alkyl group, a branched alkyl group, an aryl ether group, an alkoxy group, a hydroxyl group and the like. Among them, an aryl group and an aryl ether group are preferable.
- R 10 R 11 , R 10 and R 11 are an aryl group or a heteroaryl group. Although not particularly limited, specific examples include the following.
- the fused ring and the aliphatic ring formed between the adjacent substituents may be conjugated or non-conjugated by combining any adjacent two substituents (eg, R 1 and R 2 in the general formula (1)) with each other.
- any adjacent two substituents eg, R 1 and R 2 in the general formula (1)
- an element selected from nitrogen, oxygen, sulfur, phosphorus and silicon may be contained.
- these fused rings and aliphatic rings may be fused to further rings.
- the compound represented by the general formula (1) exhibits a high fluorescence quantum yield and has a small Stokes shift and a small peak width at half of the emission spectrum, and thus can be suitably used as a fluorescent dopant.
- the fluorescence spectrum shows a single peak in the range of 400 nm to 900 nm by material design, most of excitation energy can be obtained as light of a desired wavelength. Therefore, efficient use of excitation energy is possible, and high color purity can also be achieved.
- having a single peak in a certain wavelength range indicates that there is no peak having an intensity of 5% or more of the intensity with respect to the strongest peak in that wavelength range. The same applies to the following description.
- the compound represented by the general formula (1) has various characteristics and physical properties such as light emission efficiency, light emission wavelength, color purity, heat resistance, dispersibility and the like by introducing appropriate substituents at appropriate positions. It can be adjusted.
- R 1 , R 3 , R 4 and R 6 is a substituted or unsubstituted alkyl group, substituted or unsubstituted, as compared to the case where R 1 , R 3 , R 4 and R 6 are hydrogen atoms.
- the compound represented by the general formula (1) exhibits higher heat resistance and light stability when it is an aryl group of the above, or a substituted or unsubstituted heteroaryl group. When the heat resistance is improved, the decomposition of the compound can be suppressed at the time of manufacturing the light emitting element, and thus the durability is improved.
- R 1 to R 9 form a condensed ring with the adjacent substituent from the viewpoint of improving the heat resistance and the fluorescence quantum yield.
- R 1 , R 3 , R 4 and R 6 is a substituted or unsubstituted alkyl group, as an alkyl group, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, Alkyl groups having 1 to 6 carbon atoms, such as sec-butyl group, tert-butyl group, pentyl group and hexyl group, are preferable.
- methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group and tert-butyl group are preferable.
- a sterically bulky tert-butyl group is more preferable.
- a methyl group is also preferably used from the viewpoint of easiness of synthesis and easiness of obtaining raw materials.
- the aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a phenyl group, a biphenyl group Groups are more preferred and phenyl groups are particularly preferred.
- the heteroaryl group is preferably a pyridyl group, a quinolinyl group or a thienyl group, and a pyridyl group or a quinolinyl group is More preferred is pyridyl group.
- R 1 , R 3 , R 4 and R 6 may be the same or different, and are preferably substituted or unsubstituted alkyl groups because the color purity is particularly good.
- a methyl group is preferable as the alkyl group from the viewpoint of easiness of synthesis and easiness of obtaining raw materials.
- R 1 , R 3 , R 4 and R 6 may be all the same or different and each is a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group And is preferable because it exhibits light stability.
- all of R 1 , R 3 , R 4 and R 6 may be the same or different, and more preferably a substituted or unsubstituted aryl group.
- R 1 , R 3 , R 4 and R 6 may be the same or different and each is a substituted or unsubstituted aryl group, for example, R 1 ⁇ R 4 , R 3 ⁇ R 6 .
- R 1 ⁇ R 4 , R 3 ⁇ R 6 It is preferable to introduce a plurality of types of substituents, such as R 1 ⁇ R 3 or R 4 ⁇ R 6 .
- “ ⁇ ” indicates that it is a group having a different structure.
- R 1 ⁇ R 4 indicates that R 1 and R 4 are groups having different structures.
- R 1 ⁇ R 3 or R 4 ⁇ R 6 is preferable from the viewpoint of improving the luminous efficiency and the color purity in a well-balanced manner.
- one or more aryl groups affecting color purity are introduced into each of the pyrrole rings on both sides, and aryls affecting light emission efficiency at other positions. Both of these properties can be maximized because groups can be introduced.
- R 1 ⁇ R 3 or R 4 ⁇ R 6 it is more preferable that R 1 RR 4 and R 3 RR 6 from the viewpoint of improving both the heat resistance and the color purity.
- an aryl group substituted with an electron donating group is preferable.
- the electron donating group is an atomic group that donates an electron to a substituted atomic group by an induction effect or a resonance effect in organic electron theory.
- Examples of the electron donating group include those having a negative value as a Hammett's substituent constant ( ⁇ p (para)).
- the Hammett's substituent constant ( ⁇ p (para)) can be cited from Chemical Handbook Basic Edition, Rev. 5 Edition (II-380).
- the electron donating group include, for example, an alkyl group ( ⁇ p of methyl group: -0.17), an alkoxy group ( ⁇ p of methoxy group: -0.27), an amino group ( ⁇ p of -NH 2 :- 0.66) and the like.
- an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms is preferable, and a methyl group, an ethyl group, a tert-butyl group and a methoxy group are more preferable. From the viewpoint of dispersibility, a tert-butyl group and a methoxy group are particularly preferable.
- the substitution position of the substituent is not particularly limited, it is necessary to suppress the twist of the bond in order to enhance the photostability of the compound represented by the general formula (1), and therefore the meta position relative to the binding position with the pyrromethene skeleton It is preferable to bind at the position or para position.
- an aryl group which mainly affects the luminous efficiency an aryl group having a bulky substituent such as a tert-butyl group, an adamantyl group or a methoxy group is preferable.
- R 1 , R 3 , R 4 and R 6 may be the same or different and each is a substituted or unsubstituted aryl group
- R 1 , R 3 , R 4 and R 6 may be the same or different. And is preferably a substituted or unsubstituted phenyl group.
- each of R 1 , R 3 , R 4 and R 6 is more preferably selected from Ar-1 to Ar-6 below.
- preferred combinations of R 1 , R 3 , R 4 and R 6 include, but are not limited to, the combinations shown in Tables 1-1 to 1-11.
- R 2 and R 5 are preferably hydrogen, an alkyl group, a carbonyl group, an ester group, or an aryl group. Among them, hydrogen or an alkyl group is preferable from the viewpoint of thermal stability, and hydrogen is more preferable from the viewpoint of easily obtaining a narrow half width in the emission spectrum.
- R 8 and R 9 are preferably an alkyl group, an aryl group, a heteroaryl group, fluorine, a fluorine-containing alkyl group, a fluorine-containing heteroaryl group or a fluorine-containing aryl group.
- R 8 and R 9 are more preferably fluorine or a fluorine-containing aryl group, because they are stable to excitation light and higher fluorescence quantum yield can be obtained.
- R 8 and R 9 are more preferably fluorine.
- the fluorine-containing aryl group is an aryl group containing fluorine, and examples thereof include a fluorophenyl group, a trifluoromethylphenyl group and a pentafluorophenyl group.
- the fluorine-containing heteroaryl group is a fluorine-containing heteroaryl group, and examples thereof include a fluoropyridyl group, a trifluoromethylpyridyl group and a trifluoropyridyl group.
- the fluorine-containing alkyl group is a fluorine-containing alkyl group, and examples thereof include a trifluoromethyl group and a pentafluoroethyl group.
- X is preferably C—R 7 from the viewpoint of light stability.
- R 7 is preferably a rigid group having a small degree of freedom of movement and difficult to cause aggregation, from the viewpoint of preventing a decrease in light emission intensity due to aggregation in the film or aggregation. Specifically, it is preferably either a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group.
- X is C—R 7 and R 7 is a substituted or unsubstituted aryl group from the viewpoint of giving higher fluorescence quantum yield and being less difficult to be decomposed by heat and light stability.
- the aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, and an anthracenyl group from the viewpoint of not impairing the emission wavelength.
- R 7 is preferably a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, or a substituted or unsubstituted naphthyl group, and is preferably a substituted or unsubstituted group.
- phenyl group is preferably a substituted or unsubstituted biphenyl group, or a substituted or unsubstituted terphenyl group. Particularly preferred is a substituted or unsubstituted phenyl group.
- R 7 is preferably a moderately bulky substituent.
- R 7 has a certain height, aggregation of molecules can be prevented, and as a result, luminous efficiency and durability can be further improved.
- r is hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a thiol group, an alkoxy group, an alkylthio group, an aryl ether group, an aryl thioether , Aryl group, heteroaryl group, halogen, cyano group, aldehyde group, carbonyl group, carboxyl group, ester group, carbamoyl group, amino group, nitro group, silyl group, siloxanyl group, boryl group, phosphine oxide group It is chosen from.
- k is an integer of 1 to 3. When k is 2 or more, r may be the same or different.
- r is a substituted or unsubstituted aryl group from the viewpoint of providing a higher fluorescence quantum yield.
- aryl groups in particular, a phenyl group and a naphthyl group are mentioned as a preferred example.
- k in the general formula (8) is preferably 1 or 2, and above all, k is more preferably 2 from the viewpoint of further preventing aggregation of molecules.
- at least one of r is preferably substituted by an alkyl group.
- alkyl group in this case, a methyl group, an ethyl group and a tert-butyl group are mentioned as particularly preferable examples from the viewpoint of thermal stability, and a tert-butyl group is mentioned as a further preferable example.
- r is preferably a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group or a halogen from the viewpoint of controlling the fluorescence wavelength or absorption wavelength or enhancing the compatibility with the solvent.
- methyl, ethyl, tert-butyl and methoxy are more preferable.
- tert-butyl group and methoxy group are particularly preferable. That r is a tert-butyl group or a methoxy group is more effective in preventing quenching due to aggregation of molecules.
- R 1 to R 7 is an electron withdrawing group.
- R 1 to R 6 is an electron withdrawing group
- R 7 is an electron withdrawing group
- one is an electron withdrawing group
- R 7 is an electron withdrawing group.
- the electron withdrawing group is also referred to as an electron accepting group, and in organic electron theory, is an atomic group that attracts an electron from a substituted atomic group by an induction effect or a resonance effect.
- the electron withdrawing group those having a positive value can be mentioned as Hammett's substituent constant ( ⁇ p (para)).
- the Hammett's substituent constant ( ⁇ p (para)) can be cited from Chemical Handbook Basic Edition, Rev. 5 Edition (II-380).
- a phenyl group also has an example which takes the above positive values as mentioned above, a phenyl group is not contained in an electron withdrawing group in the present invention.
- Examples of the electron withdrawing group include, for example, -F ( ⁇ p: +0.06), -Cl ( ⁇ p: + 0.23), -Br ( ⁇ p: + 0.23), -I ( ⁇ p: +0.18), -CO 2 R 12 ( ⁇ p: +0.45 when R 12 is ethyl group), -CONH 2 ( ⁇ p: +0.38), -COR 12 ( ⁇ p: +0.49 when R 12 is methyl group),- CF 3 ( ⁇ p: +0.50), -SO 2 R 12 ( ⁇ p: +0. 6 when R 12 is a methyl group), -NO 2 ( ⁇ p: +0.81), and the like can be mentioned.
- R 12 each independently represents a hydrogen atom, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms, a substituted or unsubstituted group It represents a substituted C 1 -C 30 alkyl group or a substituted or unsubstituted C 1 -C 30 cycloalkyl group. Specific examples of these groups include the same examples as described above.
- Preferred electron withdrawing groups include fluorine, a fluorine-containing aryl group, a fluorine-containing heteroaryl group, a fluorine-containing alkyl group, a substituted or unsubstituted acyl group, a substituted or unsubstituted ester group, a substituted or unsubstituted amide group, A substituted or unsubstituted sulfonyl group or a cyano group is mentioned. More preferable electron withdrawing groups include fluorine, a fluorine-containing aryl group, a fluorine-containing heteroaryl group, a fluorine-containing alkyl group, and a substituted or unsubstituted ester group. Because these are difficult to be decomposed chemically.
- R 1 , R 3 , R 4 and R 6 may be the same or different and each is a substituted or unsubstituted alkyl group Further, the case where X is C—R 7 and R 7 is a group represented by the general formula (8) can be mentioned. In this case, R 7 is particularly preferably a group represented by General Formula (8) in which r is contained as a substituted or unsubstituted phenyl group.
- R 1 , R 3 , R 4 and R 6 may be the same or different, and Ar-1 to Ar described above
- X is C—R 7 and R 7 is a group represented by the general formula (8).
- R 7 is more preferably a group represented by General Formula (8) in which r is contained as a tert-butyl group or methoxy group
- R 7 is a group represented by General Formula (8) in which r is contained as a methoxy group. It is particularly preferred that
- the molecular weight is not particularly limited, but is preferably 1000 or less and more preferably 800 or less from the viewpoint of heat resistance and film forming property. Furthermore, from the viewpoint of providing a sufficiently high sublimation temperature and more stably controlling the deposition rate, it is more preferably 450 or more. Since the sublimation temperature is sufficiently high and contamination in the chamber can be prevented, stable high-intensity light emission is exhibited, and high-efficiency light emission is easily obtained.
- the compound represented by the general formula (1) is not particularly limited, but specific examples include the following.
- the compound represented by the general formula (1) can be synthesized, for example, by the method described in JP-A-8-509471 or JP-A-2000-208262. That is, by reacting the pyrromethene compound and the metal salt in the presence of a base, the target pyrromethene metal complex can be obtained.
- Delayed fluorescence is a phenomenon in which energy is once held in a metastable state, and then energy released is emitted as light. For example, there is a phenomenon that once excited, a transition to a different state of spin multiplicity occurs and from there enters an emission process.
- thermally activated delayed fluorescence (TADF) phenomenon after being excited, a reverse intersystem crossing from the triplet exciton to the singlet exciton occurs, and light emission occurs from the singlet level.
- the compound represented by the general formula (1) is suitable as a dopant of the light emitting layer because it exhibits high quantum efficiency and narrow half width, but is fluorescent and therefore excitation generated by recombination of electrons and holes Among the photons, triplet excitons can not be used directly as energy for light emission. However, by using a delayed fluorescence compound capable of converting a triplet exciton into a singlet exciton together with the compound represented by the general formula (1), a triplet exciton generated by recombination of electrons and holes is obtained.
- the compound represented by the general formula (1) can be converted into usable singlet excitons. This makes it possible to efficiently use excitons generated by recombination of electrons and holes as light emission.
- a compound represented by the general formula (2) can be mentioned as a suitable example.
- a 1 is an electron donating site
- a 2 is an electron accepting site
- L 1 is a linking group, which may be the same or different, and represents a single bond or a phenylene group.
- m and n are each a natural number of 1 or more and 10 or less. When m is 2 or more, a plurality of A 1 and L 1 may be the same or different. When n is 2 or more, a plurality of A 2 may be the same or different. In terms of heat resistance and film forming properties, m and n are each preferably 6 or less, and particularly preferably 4 or less.
- the electron donating site which is A 1 indicates an electron-rich site relative to the adjacent site. This generally indicates a site having a noncovalent electron pair such as nitrogen atom, oxygen atom, sulfur atom or silicon atom.
- Specific examples of the electron donating moiety include, for example, a moiety containing a structure such as primary amine, secondary amine, tertiary amine, pyrrole skeleton, ether, furan skeleton, thiol, thiophene skeleton, silane, silole skeleton, siloxane, etc. It can be mentioned.
- a 1 is preferably a group containing an electron-donating nitrogen atom, and a group containing a tertiary amine or a heteroaryl group containing an electron-donating nitrogen is preferable. Among them, a group containing a tertiary amine substituted with a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group, or a heteroaryl group containing a carbazole skeleton is more preferable.
- a 1 is preferably selected from the group represented by the following general formula (3) or (4), and more preferably a group represented by the general formula (3).
- Y 1 is selected from a single bond, CR 21 R 22 , NR 23 , O or S. Among them, preferred is a single bond, CR 21 R 22 or O, more preferred is a single bond or O, and particularly preferred is a single bond.
- the formation of a carbazole skeleton or a cyclic tertiary amine skeleton is preferable because the electron donating property of the electron donating nitrogen is increased and the charge transfer in the molecule is promoted.
- R 10 and R 11 are an aryl group or a heteroaryl group.
- To bind to L 1 at at least one position of R 12 to R 23 means that a carbon atom or nitrogen atom at the root of each R is directly linked to L 1 .
- an aryl group or a heteroaryl group is preferable, a phenyl group, a naphthalenyl group, a carbazolyl group or a dibenzofuranyl group is more preferable, and a phenyl group is particularly preferable.
- Ring a is a benzene ring or a naphthalene ring.
- a fused ring fused via ring a has excellent carrier transportability because it has a relatively wide ⁇ -conjugated plane.
- the ⁇ conjugated plane is too wide, it causes excessive intermolecular interaction and the thin film stability decreases. From the viewpoint of the balance between carrier transportability and thin film stability, a benzene ring is more preferable.
- Y 2 is selected from CR 33 R 34 , NR 35 , O or S. Among them, preferably, Y 2 is CR 33 R 34 , NR 35 or O, more preferably NR 35 or O, and particularly preferably NR 35 .
- R 24 to R 35 which may be the same or different, each represents a hydrogen atom, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a thiol group, an alkoxy group or an alkylthio group
- —P ( O) R 10 R 11 and selected from fused rings and aliphatic rings formed between adjacent substituents. However, it bonds to L 1 at at least one position of R 21 to R 35 .
- R 10 and R 11 are an aryl group or a heteroaryl group.
- a phenyl group, a biphenyl group, a naphthalenyl group, a carbazolyl group or a dibenzofuranyl group is preferable, and a phenyl group or a biphenyl group is more preferable.
- the fused ring structure represented by the general formula (4) is not particularly limited, and specific examples thereof include the following. However, the following structure shows a basic skeleton and may be substituted.
- the A 2, heteroaryl group preferably containing electron-accepting nitrogen, among others, and more preferably a group represented by the following general formula (5).
- Y 3 to Y 8 may be the same or different and are selected from CR 36 or N. At least one of Y 3 to Y 8 is N, and all of Y 3 to Y 8 are not N. If the number of N is too large, the heat resistance is reduced, so the number of N is preferably 3 or less.
- R 36 which may be the same or different, is selected from the group consisting of hydrogen atoms, aryl groups, heteroaryl groups, and fused rings and aliphatic rings formed between adjacent substituents. However, it bonds to L 1 at any one position of Y 3 to Y 8 .
- aryl group for R 36 a phenyl group, a biphenyl group and a naphthalenyl group are preferable, and a phenyl group and a biphenyl group are more preferable.
- the heteroaryl group of R 36 is preferably a heteroaryl group containing an electron accepting nitrogen, and among these, a pyridyl group and a quinolinyl group are preferable, and a pyridyl group is more preferable.
- Y 3 and is attached at least one location either ⁇ Y 8 and L 1, for example, include the case of binding to L 1 at a position of Y 3 in Example, Y 3 is a carbon atom, and the carbon atom L 1 and refers to the direct binding.
- a 2 is preferably selected from the groups represented by the following general formula (6) or (7), and more preferably a group represented by the general formula (6).
- Y 9 and Y 10 may be the same or different, and are selected from CR 40 or N. However, at least one of Y 9 and Y 10 is N. Heat resistance improves because nitrogen atoms do not adjoin each other.
- R 37 to R 40 may be the same or different, and are selected from a hydrogen atom, an aryl group or a heteroaryl group. With the proviso that at least one of R 37 to R 40 binds to L 1 .
- the aryl group of R 37 to R 40 is preferably a phenyl group, a biphenyl group and a naphthalenyl group, more preferably a phenyl group and a biphenyl group.
- the heteroaryl group of R 37 to R 40 is preferably a heteroaryl group containing an electron accepting nitrogen, and among them, a pyridyl group and a quinolinyl group are preferable, and a pyridyl group is more preferable.
- one of R 37 ⁇ R 40 to bind to the L 1 is, for example, include the case of binding to L 1 at a position of R 37 as an example, a carbon atom and L 1 at the root of R 37 Directly bond.
- the group represented by General formula (6) is not specifically limited, Specifically, the following examples may be mentioned.
- the phenyl group in the following structure may be a biphenyl group, a naphthalenyl group, a pyridyl group or a quinolinyl group, and may be further substituted.
- R 41 to R 46 which may be the same or different, are each selected from a hydrogen atom, an aryl group or a heteroaryl group. However, in at least one position either R 41 or R 42, binding to L 1.
- the aryl group of R 41 to R 46 is preferably a phenyl group, a biphenyl group and a naphthalenyl group, more preferably a phenyl group and a biphenyl group.
- the heteroaryl group of R 41 to R 46 is preferably a heteroaryl group containing an electron accepting nitrogen, among which a pyridyl group and a quinolinyl group are preferable, and a pyridyl group is more preferable.
- a 2 is a group represented by General Formula (7)
- the energy difference between HOMO and LUMO becomes smaller.
- the compound represented by General formula (2) can be combined suitably with what shows light emission of a longer wavelength among the compounds represented by General formula (1).
- the molecular weight of the compound represented by the general formula (2) is not particularly limited, but is preferably 900 or less, more preferably 800 or less, from the viewpoint of heat resistance and film formability. More preferably, it is 700 or less, and particularly preferably 650 or less. Also, generally, the larger the molecular weight, the higher the glass transition temperature, and the higher the glass transition temperature, the better the stability of the thin film. Therefore, the molecular weight is preferably 400 or more, and more preferably 450 or more. More preferably, it is 500 or more.
- the electron donating site and the electron accepting site exist in the same molecule.
- Such a compound is likely to have a small energy difference ( ⁇ ST) between the singlet level and the triplet level, and easily exhibit TADF properties.
- ⁇ ST small energy difference
- ⁇ ST does not become sufficiently small and can not exhibit the highly efficient TADF phenomenon.
- the compound represented by the general formula (2) comprises a combination of a specific electron donating site represented by the general formula (3) or (4) and a specific electron accepting site represented by the general formula (5) Is preferred. This is because the highly efficient TADF phenomenon is exhibited.
- the electron donating moiety represented by the general formulas (3) and (4) has an electron donating nitrogen.
- the electron accepting moiety represented by the general formula (5) has an electron accepting nitrogen.
- a change in electron distribution occurs efficiently between the site having the electron donating nitrogen and the site having the electron accepting nitrogen.
- the conjugated system of the specific electron accepting site represented by the general formula (5) is relatively narrow.
- the sites represented by the general formulas (3) and (4) have an electron donating nitrogen and therefore exhibit hole transportability.
- the site represented by the general formula (5) has an electron accepting nitrogen and therefore exhibits an electron transporting property. That is, since the compound represented by the general formula (2) has both the hole transporting site and the electron transporting site, it has a bipolar property capable of transporting both the hole and the electron. Therefore, in the light emitting layer, localization of the recombination region can be suppressed, and the lifetime of the device can be extended.
- the compound represented by the general formula (2) is not particularly limited, but specific examples include the following.
- a known method can be used for the synthesis of the compound represented by the general formula (2).
- carbon-carbon when introducing an aryl group or a heteroaryl group at a certain site P, carbon-carbon can be obtained by using a coupling reaction of a halogenated derivative of the site P with a boronic acid or a boronic acid esterified derivative of the aryl or heteroaryl.
- Nonlimiting examples include methods of generating a bond.
- a coupling reaction of a halogenated derivative of the site P with an amine or a carbazole derivative under a metal catalyst such as palladium is used.
- a metal catalyst such as palladium
- the light emitting device has an anode, a cathode, and an organic layer interposed between the anode and the cathode, and the organic layer emits light by electric energy.
- the organic layer is composed of only the light emitting layer, and 1) hole transporting layer / light emitting layer, 2) light emitting layer / electron transporting layer, 3) hole transporting layer / light emitting layer / electron transporting layer, 4) positive A laminated structure of hole transport layer / light emitting layer / electron transport layer / electron injection layer, 5) hole injection layer / hole transport layer / light emitting layer / electron transport layer / electron injection layer, etc. may be mentioned.
- Each of the layers may be either a single layer or a plurality of layers.
- the light emitting element may be a stack type including a plurality of phosphorescent light emitting layers or fluorescent light emitting layers, or may be a light emitting element in which a fluorescent light emitting layer and a phosphorescent light emitting layer are combined. Furthermore, it is possible to stack light emitting layers that respectively exhibit different emission colors.
- the intermediate layer is generally referred to as an intermediate electrode, an intermediate conductive layer, a charge generation layer, an electron extraction layer, a connection layer, or an intermediate insulating layer, and a known material configuration can be used.
- tandem type are, for example, 4) hole transport layer / light emitting layer / electron transport layer / charge generation layer / hole transport layer / light emitting layer / electron transport layer, 5) hole injection layer / hole transport layer / Charge generation layer as an intermediate layer between the anode and the cathode, such as light emitting layer / electron transport layer / electron injection layer / charge generation layer / hole injection layer / hole transport layer / light emission layer / electron transport layer / electron injection layer And a laminated structure including the above.
- the light emitting element according to the embodiment of the present invention may have an element structure (top emission type) for extracting light from the cathode side or an element structure (bottom emission type) for extracting light from the anode side
- the top emission method is more preferable in that the aperture ratio (the ratio of the light emitting area to the pixel area) can be increased and the luminance can be increased.
- the color purity of light emission can be improved by using a microcavity structure in which the resonance action to the light emission wavelength is used.
- the top emission system is more preferable also in that the light emission with high color purity indicated by the compound represented by the general formula (1) can be further enhanced.
- At least one light emitting layer contains the compound represented by the general formula (1) and the compound represented by the general formula (2).
- the compound represented by General Formula (2) it is preferable to use the compound represented by General Formula (2) as a host material, using the compound represented by General Formula (1) as a dopant.
- the compound represented by the general formula (2) exhibits TADF property, and the triplet excitation energy generated by the recombination of holes and electrons is represented by the general formula (2) The compound converts it into singlet excitation energy. Thereafter, the singlet excitation energy is transferred to the compound represented by the general formula (1) to emit light.
- the dopant material may be only the compound represented by the general formula (1) or a combination of a plurality of compounds. From the viewpoint of obtaining light emission of high color purity, it is preferable that only the compound represented by the general formula (1) is used. Moreover, it is preferable that the compound represented by General formula (1) is disperse
- the ratio of the compound represented by the general formula (1) in the light emitting layer is preferably 5 wt% or less, more preferably 2 wt% or less, and still more preferably 1 wt% or less, since concentration quenching phenomenon occurs if the ratio is too large.
- the compound represented by the general formula (1) has a very large fluorescence quantum yield, and efficiently emits the singlet excitation energy received from the general formula (2) as fluorescence. Therefore, efficient light emission is possible even at low concentration.
- the host material may be only the compound represented by General Formula (2) or a combination of a plurality of compounds, but is preferably a combination of a plurality of compounds.
- the compound represented by the general formula (2) is combined with another host material, the content of the compound represented by the general formula (2) in the light emitting layer is reduced, so the compound represented by the general formula (2)
- the energy transfer directly from the triplet level of the compound to the triplet level of the compound represented by the general formula (1) can be suppressed by the Dexter mechanism. As a result, the efficiency of energy transfer through the TADF phenomenon is improved, and high light emission efficiency can be expected.
- the proportion of the compound represented by the general formula (2) in the light emitting layer is preferably less than 70 wt%, and more preferably less than 50 wt%.
- a material having a triplet level higher than a singlet level of the compound represented by the general formula (2) is preferable.
- Such host materials include, but are not limited to, fused aromatic ring derivatives such as anthracene and pyrene, fluorene derivatives, dibenzofuran derivatives, carbazole derivatives, indolocarbazole derivatives and the like.
- carbazole derivatives such as 4,4'-bis (carbazol-9-yl) biphenyl (CBP), 1,3-bis (carbazol-9-yl) benzene and carbazole multimers have higher triplet levels. It is preferable to have it.
- carbazole multimers are preferable, and bis (N-arylcarbazole) derivatives represented by General Formula (14) are more preferable in that they exhibit excellent carrier transportability.
- R 51 to R 66 which may be the same or different, each represents a hydrogen atom, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a thiol group, an alkoxy group or an alkylthio group
- —P ( O) R 10 R 11 and selected from fused rings and aliphatic rings formed between adjacent substituents. However, L 4 is linked at one position of R 51 to R 58 and at one position of R 59 to R 66 .
- R 10 and R 11 are an aryl
- L 4 to L 6 are a single bond or a phenylene group.
- L 4 is linked to a position of one of R 51 to R 58 and a position of one of R 59 to R 66 .
- Ar 6 and Ar 7 may be the same or different and each represents a substituted or unsubstituted aryl group.
- L 4 is preferably linked to a position of one of R 56 and R 57 and a position of one of R 60 and R 61 . This is because the hole transportability of the compound represented by the general formula (14) is improved, and when combined with the compound represented by the general formula (2), the carrier balance is improved. Furthermore, L 4 is connected at the position of the position and R 61 in R 56, or the L 4 is connected at the position of the position and R 60 in R 57 is more preferably, L 4 and the position of R 56 R It is particularly preferred to connect at position 61 .
- the aryl group of Ar 6 and Ar 7 may be the same or different, and may be phenyl group, biphenyl group, terphenyl group, naphthyl group, fluorenyl group, phenanthryl group, anthracenyl group, pyrenyl group, fluoranthenyl group,
- a triphenylenyl group is preferable, and being a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, and a triphenylenyl group is because the conjugation is not excessively broadened and the triplet level is not excessively lowered. More preferable.
- phenyl group More preferably, they are a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group and a fluorenyl group.
- the substituent is selected from alkyl group, cycloalkyl group, alkoxy group, aryl ether group, halogen, cyano group, amino group, nitro group, silyl group, phenyl group and naphthyl group Is preferred.
- Ar 6 and Ar 7 may be the same as or different from each other, and a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted 2-
- a fluorenyl group is preferable because the triplet level is increased.
- the substituent is preferably selected from an alkyl group, a cycloalkyl group, an alkoxy group, an aryl ether group, a halogen, a cyano group, an amino group, a nitro group, a silyl group and a phenyl group .
- Preferred examples of Ar 6 and Ar 7 include, but are not particularly limited to, the following examples.
- the compound represented by the general formula (14) has an asymmetric structure, and the interaction between the force rubazole skeletons is suppressed, whereby a stable thin film can be formed, which is preferable.
- R 64 is an aryl group
- the hole transportability of the compound represented by the general formula (14) is improved, and in the general formula (2) It is preferable because the carrier balance is improved when combined with the compound to be represented.
- R 64 is an aryl group
- the aryl group may be the same or different from each other from the viewpoint that the conjugation is not excessively broadened and the triplet level is not excessively lowered, and substituted or unsubstituted phenyl Group, biphenyl group, terphenyl group, naphthyl group, fluorenyl group, phenanthryl group, anthracenyl group, pyrenyl group, fluoranthenyl group, triphenylenyl group is preferable, and substituted or unsubstituted phenyl group, biphenyl group, terphenyl group, More preferably, they are a naphthyl group, a fluorenyl group, a phenanthryl group and a triphenylenyl group.
- R 64 is a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted 2-fluorenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group Is preferable because the triplet level is high.
- Particularly preferred are a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted 2-fluorenyl group, and a substituted or unsubstituted terphenyl group.
- the substituent is preferably selected from an alkyl group, a cycloalkyl group, an alkoxy group, an aryl ether group, a halogen, a cyano group, an amino group, a nitro group and a silyl group.
- the compound represented by the general formula (14) is not particularly limited, but specific examples include the following.
- (lambda) 1 (abs) represents the peak wavelength (nm) of the peak by the side of a longest wavelength among the absorption spectra in the wavelength of 400 nm-900 nm of a compound represented by General formula (1).
- (lambda) 2 (FL) represents the peak wavelength (nm) of the peak by the side of the longest wavelength among the fluorescence spectra in the wavelength of 400 nm-900 nm of a compound represented by General formula (2).
- the peak is the maximum portion of the spectrum, and the peak wavelength indicates the wavelength at which the maximum value is taken.
- the peak on the longest wavelength side comparison is made at major peaks excluding excessively small peaks such as noise. For example, small peaks whose half width is less than 10 nm are excluded.
- the compound represented by the general formula (1) has a high fluorescence quantum yield, so that singlet excitation energy transferred from the compound represented by the general formula (2) can be smoothly converted into fluorescence. Thereby, it can suppress that singlet excitation energy remains in the compound represented by General formula (2), and can suppress light emission derived from the compound represented by General formula (2). Moreover, the compound represented by General formula (2) does not necessarily have a high fluorescence quantum yield compared with the compound represented by General formula (1). Therefore, when singlet excitation energy remains in the compound represented by the general formula (2), if only the compound represented by the general formula (2) is present, loss of energy due to non-radiative deactivation etc. Will occur. However, the loss can be suppressed by combining the compound represented by General Formula (2) and the compound represented by General Formula (1).
- the emission of a single peak in the wavelength range of 400 nm to 900 nm is achieved.
- the half width of the single peak is preferably 60 nm or less, more preferably 50 nm or less.
- the light-emitting device is a light-emitting layer (hereinafter referred to as “others”) in addition to the light-emitting layer containing the compound represented by General Formula (1) and the compound represented by General Formula (2) It may have a light emitting layer "as appropriate. In that case, generally used light emitting materials can be used besides the compound represented by General Formula (1) and the compound represented by General Formula (2).
- the other light emitting layer may be either a single layer or a plurality of layers, each of which is formed of a light emitting material (host material, dopant material).
- the other light emitting layer may be composed of a mixture of the host material and the dopant material, or may be composed of the host material alone. That is, in each light emitting layer, only the host material or the dopant material may emit light, or both the host material and the dopant material may emit light. From the viewpoint of efficiently using electric energy and obtaining light emission of high color purity, the other light emitting layer is preferably made of a mixture of a host material and a dopant material.
- each of the host material and the dopant material may be of one type or a combination of two or more types.
- the dopant material may be contained in the entire host material or may be partially contained.
- the dopant material may be either stacked or dispersed.
- the dopant material can control emission color.
- the amount of the dopant material is preferably 20% by weight or less, more preferably 10% by weight or less, based on the host material, because concentration quenching occurs if the amount is too large.
- the doping method a method of co-evaporating the host material and the doping material, a method of mixing the host material and the doping material in advance and simultaneously depositing them may be mentioned.
- the host material contained in the light emitting material is not particularly limited, but compounds having a fused 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-chelated oxinoids such as tris (8-quinolinate) aluminum (III) Compound, bis-styryl derivative such as distyrylbenzene derivative, tetraphenyl butadiene derivative, indene derivative, coumarin derivative, oxadiazole derivative, pyrrolopyridine derivative, perinone derivative, cyclopentadiene derivative, pyrrolopyrrole derivative, For diazolopyr
- the dopant material is not particularly limited, but compounds having a fused aryl ring such as naphthalene, anthracene, phenanthrene, pyrene, chrysene, triphenylene, perylene, fluoranthene, fluorene, indene and derivatives thereof (for example, 2- (benzothiazole- 2-yl) -9,10-diphenylanthracene, 5,6,11,12-tetraphenylnaphthacene, etc., furan, pyrrole, thiophene, silole, 9-silafluorene, 9,9'-spirobisilafluorene, Benzothiophene, benzofuran, indole, dibenzothiophene, dibenzofuran, imidazopyridine, phenanthroline, pyridine, pyrazine, naphthyridine, quinoxaline, pyrrolopyridine
- the other light emitting layer may contain a phosphorescent light emitting material.
- the phosphorescent material is a material that exhibits phosphorescent light even at room temperature.
- a phosphorescent light emitting material it is not particularly limited, and iridium (Ir), ruthenium (Ru), rhodium (Rh), palladium (Pd), platinum (Pt), osmium (Os), And an organometallic complex compound containing at least one metal selected from the group consisting of rhenium (Re).
- an organometallic complex having iridium or platinum is more preferable from the viewpoint of having a high phosphorescent emission yield even at room temperature.
- Hosts used in combination with phosphorescent dopants include indole derivatives, carbazole derivatives, indolocarbazole derivatives, pyridine, pyrimidine, nitrogen-containing aromatic compound derivatives having a triazine skeleton, polyarylbenzene derivatives, spirofluorene derivatives, Preferred are aromatic hydrocarbon compound derivatives such as toluxene derivatives and triphenylene derivatives, compounds containing a chalcogen element such as dibenzofuran derivatives and dibenzothiophene derivatives, and organic metal complexes such as beryllium quinolinol complexes.
- any triplet energy may be used as long as the triplet energy is larger than that of the dopant used and electrons and holes are injected and transported smoothly from the respective transport layers.
- the other light emitting layer may contain two or more triplet light emitting dopants, or may contain two or more host materials. Furthermore, the other light emitting layer may contain one or more types of triplet light emitting dopants and one or more types of fluorescence emitting dopants.
- the preferred phosphorescent host or dopant is not particularly limited, and specific examples include the following.
- the other light emitting layer may contain a TADF material as a dopant.
- the TADF material may be a single material showing a TADF, or a plurality of materials showing a TADF.
- the TADF material used may be a single material or a plurality of materials, and known materials can be used. Specific examples thereof include benzonitrile derivatives, triazine derivatives, disulfoxide derivatives, carbazole derivatives, indolocarbazole derivatives, dihydrophenazine derivatives, thiazole derivatives, oxadiazole derivatives and the like.
- the compound represented by the general formula (2) of the present invention can also be suitably used as a TADF dopant.
- the anode and the cathode have a role of supplying a sufficient current for light emission of the device.
- at least one of the anode and the cathode is 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 not particularly limited as long as it is a material capable of efficiently injecting holes into the organic layer, and, for example, a conductive material such as tin oxide, indium oxide, indium tin oxide (ITO), or zinc indium oxide (IZO) Metal oxides, or metals such as gold, silver and chromium, inorganic conductive substances such as copper iodide and copper sulfide, and conductive polymers such as polythiophene, polypyrrole and polyaniline. Among them, ITO and tin oxide are preferable. These electrode materials may be used alone, or a plurality of materials may be laminated or mixed.
- a conductive material such as tin oxide, indium oxide, indium tin oxide (ITO), or zinc indium oxide (IZO) Metal oxides, or metals such as gold, silver and chromium, inorganic conductive substances such as copper iodide and copper sulfide, and conductive polymers such as
- the resistance of the anode is not particularly limited as long as a current sufficient for light emission of the device can be supplied, but in view of the power consumption of the device, the resistance of the anode is preferably low.
- an ITO substrate of 300 ohms / square or less functions as a device electrode, but it is particularly preferable to use a substrate having a low resistance of 20 ohms / square or less.
- the thickness of the anode can be arbitrarily selected in accordance with the resistance value, but usually 100 to 300 nm is preferable.
- the light emitting element in order to maintain the mechanical strength of the light emitting element, it is preferable to form the light emitting element on a substrate.
- a glass substrate such as soda glass or non-alkali glass is preferably used.
- the thickness of the glass substrate is sufficient if it has a thickness sufficient to maintain the mechanical strength, so 0.5 mm or more is sufficient.
- non-alkali glass is preferable because it is preferable that the amount of ions eluted from the glass be small.
- a soda lime glass with a barrier coating such as SiO 2 may also be used, as it is commercially available.
- the substrate does not have to be glass, and for example, the anode may be formed on a plastic substrate.
- the method for forming the anode is not particularly limited, such as electron beam method, sputtering method and chemical reaction method.
- the material used for the cathode is not particularly limited as long as the material can efficiently inject electrons into the light emitting layer.
- metals such as platinum, gold, silver, copper, iron, tin, aluminum and indium or alloys or multilayers of these metals with low work function metals such as lithium, sodium, potassium, calcium and magnesium
- aluminum, silver and magnesium are preferable as the main component of the cathode from the viewpoint of electric resistance value, ease of film formation, stability of film, luminous efficiency and the like.
- the cathode is made of magnesium and silver, it is preferable because electron injection to the electron transport layer and the electron injection layer becomes easy and low voltage driving becomes possible.
- metals such as platinum, gold, silver, copper, iron, tin, aluminum and indium, alloys using at least one of these metals, inorganic substances such as silica, titania and silicon nitride, It is preferable to laminate an organic polymer compound such as polyvinyl alcohol, polyvinyl chloride, or a hydrocarbon-based polymer compound as a protective film layer on the cathode.
- an organic polymer compound such as polyvinyl alcohol, polyvinyl chloride, or a hydrocarbon-based polymer compound
- the protective film layer is selected from materials having optical transparency in the visible light region.
- the method of producing the cathode 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 of using a mixture of a hole transport material and a polymer binder.
- the hole transport material preferably transports holes from the positive electrode efficiently. Therefore, it is preferable that the hole injection efficiency is high and the injected holes are efficiently transported.
- the hole transport material is not particularly limited.
- carbazole multimers specifically, derivatives of carbazole dimer such as bis (N-arylcarbazole) or bis (N-alkylcarbazole), derivatives of carbazole trimer and derivatives of carbazole tetramer are preferable. , Carbazole dimer derivatives and carbazole trimer derivatives are more preferable. Furthermore, asymmetric type bis (N-arylcarbazole) derivatives are particularly preferred. These carbazole multimers have good electron blocking properties and hole injection / transport properties, and can contribute to further increase in efficiency of the light emitting device.
- a material having one carbazole skeleton and one triarylamine skeleton is also preferable. More preferably, it is a material having an arylene group as a linking group between a nitrogen atom of an amine and a carbazole skeleton, and particularly preferably a material having a skeleton represented by the following general formulas (12) and (13) .
- L 2 and L 3 are arylene groups, and Ar 1 to Ar 5 are aryl groups.
- the hole transport material in addition to the above compounds, triphenylene compounds, pyrazoline derivatives, stilbene derivatives, hydrazone derivatives, benzofuran derivatives, thiophene derivatives, oxadiazole derivatives, phthalocyanine derivatives, heterocyclic compounds such as porphyrin derivatives, fullerene derivatives Etc.
- polycarbonate, a styrene derivative, or the like having a structure similar to that of the hole transport material in the side chain can be preferably used as the hole transport material.
- polythiophene, polyaniline, polyfluorene, polyvinylcarbazole and polysilane can also be preferably used.
- inorganic compounds such as p-type Si and p-type SiC can also be used.
- the hole transport layer may be composed of a plurality of layers, but it is preferable to use a monoamine compound having a spirofluorene skeleton as the hole transport layer in direct contact with the light emitting layer of the present invention.
- the injection of electrons into the light emitting layer is injected into the LUMO level of the host material.
- the delayed fluorescence compound exemplified by the compound represented by the general formula (2) used in the light emitting layer of the present invention has a strong electron accepting property, in other words, a substituent having a high electron affinity.
- the LUMO level is deeper than the LUMO level of the host material.
- the light emitting layer containing the delayed fluorescent compound is more likely to receive electrons from the electron transport layer than a general light emitting layer. Furthermore, when the light emitting layer contains the compound represented by the general formula (1), these compounds have a deeper LUMO level than the host material and the delayed fluorescence compound. Therefore, since the light emitting layer containing the delayed fluorescence compound and the compound represented by the general formula (1) can receive electrons more easily from the electron transporting layer, the light emitting layer of the present invention tends to be electron-rich. Therefore, electrons easily leak to the hole transport layer side. In order to suppress this, it is necessary to confine electrons in the light emitting layer using a hole transport material having a small electron affinity, that is, a shallow LUMO level.
- the monoamine compound which has spiro fluorene frame is a material which has a big steric hindrance.
- Such materials can reduce the planarity of molecules and reduce the interaction between molecules. As the interaction between molecules becomes smaller, the energy gap becomes larger and the LUMO level becomes shallower. That is, since the electron affinity decreases and the electron blocking property increases, it becomes possible to confine electrons in the light emitting layer, and it is possible to further improve the light emission efficiency and the durability. Furthermore, as the interaction between molecules is reduced, the fluorescence quantum yield in the amorphous state is increased. Therefore, in the organic thin film light emitting element, the decomposition of the material in the excited state can be suppressed, and an element having high durability can be obtained.
- the remaining two preferable substituents bonded to the nitrogen atom of the monoamine compound having a spirofluorene skeleton include an aryl group and a heteroaryl group.
- aryl groups a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted fluorenyl group in view of having a high triplet level and preventing deepening of the LUMO level Or a substituted or unsubstituted spirofluorenyl group is more preferable, and a substituted or unsubstituted biphenyl group or a substituted or unsubstituted fluorenyl group is more preferable.
- a substituted or unsubstituted p-biphenyl group, a substituted or unsubstituted p-terphenyl group, and a substituted or unsubstituted 2-fluorenyl group are most preferable from the viewpoint of having higher mobility and capable of reducing the driving voltage.
- heteroaryl groups for example, having a group containing an electron accepting nitrogen such as a pyridyl group may cause the LUMO level to be deep, so a heteroaryl group not containing an electron accepting nitrogen is preferable, among them It is more preferable that it is a group having a substituted or unsubstituted dibenzofuranyl group which is electron resistant and can be expected to improve durability, or a substituted or unsubstituted dibenzothiophenyl group, and the substituted or unsubstituted dibenzofuranyl group is More preferable.
- the preferred monoamine compound having a spirofluorene skeleton is not particularly limited, and specific examples include the following.
- a hole injection layer may be provided between the anode and the hole transport layer.
- the driving voltage of the light emitting element can be lowered and the durable life can be improved.
- benzidine derivatives such as TPD 232 described above, starburst arylamine materials, and phthalocyanine derivatives may be used.
- the hole injection layer be composed of an acceptor compound alone, or that the acceptor compound be doped into another hole transport material.
- the acceptor compound include, but are not particularly limited to, iron (III) chloride, aluminum chloride, gallium chloride, indium chloride, metal chloride such as antimony chloride, molybdenum oxide, vanadium oxide, tungsten oxide, ruthenium oxide And metal oxides, charge transfer complexes 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 suitably used.
- metal oxides and cyano group-containing compounds are preferable. These compounds are easy to handle and easy to deposit, so that the above-described effects can be easily obtained.
- Specific examples of the cyano group-containing compound include the following compounds.
- the hole injection layer is composed of the acceptor compound alone or in the case where the hole injection layer is doped with the acceptor compound, the hole injection layer may be a single layer, Multiple layers may be stacked. Further, 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 preferred.
- the electron transport layer is a layer between the cathode and the light emitting layer.
- the electron transporting layer may be a single layer or a plurality of layers, and may or may not be in contact with the cathode or the light emitting layer.
- the electron transporting layer is desired to have high electron injection efficiency from the cathode, to efficiently transport the injected electrons, and to have high electron injection efficiency to the light emitting layer.
- the electron transporting material used for the electron transporting layer is not particularly limited, but is a styryl aromatic ring represented by a fused polycyclic aromatic derivative such as naphthalene or anthracene, or 4,4'-bis (diphenylethenyl) biphenyl Derivatives, quinone derivatives such as anthraquinone and diphenoquinone, phosphor oxide derivatives, quinolinol complexes such as tris (8-quinolinolato) aluminum (III), benzoquinolinol complexes, hydroxyazole complexes, azomethine complexes, tropolone metal complexes and flavonol metal complexes Metal complexes are mentioned. Moreover, it is also preferable to use a compound having an aromatic heterocyclic structure containing an electron accepting nitrogen, which is composed of an element selected from carbon, hydrogen, nitrogen, oxygen, silicon and phosphorus.
- the compound having an aromatic heterocyclic structure containing an electron accepting nitrogen is not particularly limited.
- triazine derivatives such as 2,4,6-tri ([1,1′-biphenyl] -4-yl) -1,3,5-triazine, tris (N-phenylbenzimidazol-2-yl) benzene and the like
- Imidazole derivatives oxadiazole derivatives such as 1,3-bis [(4-tert-butylphenyl) 1,3,4-oxadiazolyl] phenylene, N-naphthyl-2,5-diphenyl-1,3,4- Triazole derivatives such as triazole, phenanthroline derivatives such as vasocuproin and 1,3-bis (1,10-phenanthrolin-9-yl) benzene, 2,2′-bis (benzo [h] quinolin-2-yl) -9, Benzoquinoline derivatives such as 9′-spirobifluorene, 2,5-bis (6 ′-(2 ′, 2 ′ ′-
- particularly preferred electron transport materials include triazine derivatives and phenanthroline derivatives.
- the triazine derivative has high triplet energy, so that triplet exciton energy generated in the light emitting layer can be prevented from leaking to the electron transport layer.
- the TADF material used in the light emitting layer has a LUMO energy level equivalent to that of the triazine derivative, when the triazine derivative is used in the electron transport layer, the barrier having a small barrier to the TADF material in the light emitting layer Electron injection becomes possible, and low voltage, high efficiency, and long life can be realized.
- the triazine derivative is a compound represented by the following general formula (15), the above-mentioned effect is more preferable, and thus it is more preferable.
- Ar 8 to Ar 10 which may be the same or different, each represents a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group.
- the aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a spirofluorenyl group, a triphenylenyl group and a phenanthrenyl group, and a phenyl group, a biphenyl group, a naphthyl group and a fluorenyl group are particularly preferable.
- the electron transport layer may be formed of a plurality of layers, in which case it is preferred that the triazine derivative be used in the layer directly in contact with the light emitting layer for the reasons described above.
- the phenanthroline derivative has high electron mobility, and further has the property of being easy to inject electrons from the cathode. Therefore, by using the phenanthroline derivative as the electron transport layer, a significant reduction in voltage and an increase in efficiency can be realized.
- the phenanthroline derivative is a phenanthroline multimer, it is more preferable because the above-mentioned effect is greater.
- the compound represented by the following general formula (16) is mentioned.
- R 71 to R 78 which may be the same or different, each represents a hydrogen atom, a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group.
- Ar 11 is a substituted or unsubstituted aryl group.
- p is a natural number of 1 to 3. In the case where the electron transport layer is formed of a plurality of layers, it is preferable to use a phenanthroline derivative for the layer in contact with the cathode or the electron injection layer for the reason described above.
- the preferable electron transporting material is not particularly limited, and specifically, the following examples may be mentioned.
- the electron transport material may be used alone, or 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. Absent.
- the electron transport layer may further contain a donor material.
- the donor material is a material that facilitates electron injection from the cathode or the electron injection layer to 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 include alkali metals, inorganic salts containing alkali metals, complexes of alkali metals and organic substances, alkaline earth metals, inorganic salts containing alkaline earth metals, or alkaline earth metals and organic substances And the like.
- Preferred types of alkali metals and alkaline earth metals include alkali metals such as lithium, sodium and cesium, which have a large effect of improving the electron transport ability at a low work function, and alkaline earth metals such as magnesium and calcium.
- an electron injecting layer may be provided between the cathode and the electron transporting layer.
- the electron injection layer is inserted for the purpose of assisting the injection of electrons from the cathode to the electron transport layer.
- a compound having a heteroaryl ring structure containing an electron accepting nitrogen may be used, or a layer containing the above-mentioned donor material may be used.
- an insulator or a semiconductor inorganic substance can be used for the electron injection layer.
- an insulator or a semiconductor inorganic substance can be used for the electron injection layer.
- At least one metal compound selected from the group consisting of alkali metal chalcogenides, alkaline earth metal chalcogenides, halides of alkali metals and halides of alkaline earth metals.
- preferable alkali metal chalcogenides include, for example, Li 2 O, Na 2 S and Na 2 Se
- preferable alkaline earth metal chalcogenides include, for example, CaO, BaO, SrO, BeO, BaS and CaSe.
- a halide of a preferable alkali metal LiF, NaF, KF, LiCl, KCl, NaCl etc. are mentioned, for example.
- Preferable halides of alkaline earth metals for example, fluorides or CaF 2, or the like 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 suitably used for the electron injection layer.
- organic metal complexes preferred examples of the organic substance include quinolinol, benzoquinolinol, pyridylphenol, flavonol, hydroxyimidazopyridine, hydroxybenzazole, hydroxytriazole and the like.
- organometallic complexes a complex of an alkali metal and an organic substance is preferable, and a complex of lithium and an organic substance is more preferable.
- the charge generating layer is an intermediate layer between the anode and the cathode in the above tandem structure type device, and is a layer which generates holes and electrons by charge separation. is there.
- the charge generation layer is generally formed of a P-type layer on the cathode side and an N-type layer on the anode side. For these layers, efficient charge separation and efficient transport of generated carriers are desired.
- materials used for the above-described hole injection layer and hole transport layer can be used.
- benzidine derivatives such as HAT-CN6, NPD and TBDB
- materials called starburst arylamines such as m-MTDATA and 1-TNATA
- materials having a skeleton represented by the general formulas (12) and (13), etc. can be suitably used.
- the materials used for the above-mentioned electron injection layer and electron transport layer can be used, and compounds having a heteroaryl ring structure containing an electron accepting nitrogen may be used, or the above-mentioned A layer containing a donor material may be used.
- the method of forming the above-mentioned layers constituting the light emitting element is not particularly limited, such as resistance heating evaporation, electron beam evaporation, sputtering, molecular lamination method, coating method, etc. Usually, resistance heating evaporation or electron beam evaporation is preferable from the point of element characteristics. preferable.
- the light emitting element according to the embodiment of the present invention has a function capable of converting electrical energy into light.
- direct current is mainly used as the electrical energy, it is also possible to use pulse current or alternating current.
- the current value and the voltage value are not particularly limited, but in consideration of the power consumption and the lifetime of the device, they should be selected so as to obtain the maximum luminance with the lowest possible energy.
- the light emitting device is suitably used for a display. Specifically, for example, it is suitably used as a display that displays in a matrix and / or segment system.
- pixels for display are two-dimensionally arranged in a lattice shape, a mosaic shape, or the like, and a character or an image is displayed by a set of pixels.
- the shape and size of the pixels depend on the application. For example, for displaying images and characters on personal computers, monitors, and televisions, square pixels with one side of 300 ⁇ m or less are usually used, and in the case of a large display such as a display panel, pixels with one side of mm order become.
- monochrome display pixels of the same color may be arranged, but in color display, red, green and blue pixels are displayed side by side. In this case, there are typically delta types and stripe types.
- the method of driving this matrix may be either a line sequential driving method or an active matrix. Although the line sequential drive has a simple structure, the active matrix may be superior in some cases in consideration of the operation characteristics, so it is necessary to use this in accordance with the application.
- the segment method is a method in which a pattern is formed so as to display predetermined information, and a region determined by the arrangement of the pattern is made to emit light. Examples include time and temperature displays on digital watches and thermometers, operation state displays on audio devices and induction cookers, and panel displays on automobiles.
- the matrix display and the segment display may coexist in the same panel.
- the light emitting device can be preferably used as a backlight of various displays.
- displays include liquid crystal displays, displays in watches and audio devices, automobile panels, display boards and signs.
- the light-emitting element of the present invention is preferably used for a backlight of applications such as liquid crystal displays, particularly TVs, tablets, smart phones, personal computers, etc., for which thinning has been considered. This makes it possible to provide a thinner and lighter backlight than the conventional one.
- the light emitting element according to the embodiment of the present invention is preferably used as various lighting devices.
- the light emitting element according to the embodiment of the present invention can achieve both high luminous efficiency and high color purity, and can be made thinner and lighter, so that low power consumption and bright luminescent color, A lighting device having high designability can be realized.
- the light emitting device according to the embodiment of the present invention is also preferably used for a sensor.
- the light emitting device of the present invention is preferably used as a wearable sensor that requires low power consumption and small size and light weight, and provides a small sensor capable of visualizing changes due to heat or pressure or light or other stimulus or chemical reaction. it can.
- ⁇ 1 (abs) and ⁇ 2 (FL) were determined by measuring the absorption spectrum and the fluorescence spectrum by the method shown below.
- the fluorescence spectrum of the compound was prepared by dissolving the compound in 2-methyltetrahydrofuran at a concentration of 1 ⁇ 10 ⁇ 6 mol / L using an F-2500 spectrofluorimeter (manufactured by Hitachi, Ltd.) and exciting it at a wavelength of 350 nm. The fluorescence spectrum was measured.
- Example 1 A glass substrate (Geomatech Co., Ltd. product, 11 ⁇ / ⁇ , sputtered product) on which 100 nm of Ag 0.98 Pd 0.01 Cu 0.01 alloy and 10 nm of ITO transparent conductive film were deposited was cut into 38 ⁇ 46 mm and etching was performed. The obtained substrate was subjected to ultrasonic cleaning for 15 minutes with “SEMICOCLEAN 56” (trade name, manufactured by Furuuchi Chemical Co., Ltd.), and then washed with ultrapure water. The substrate was subjected to UV-ozone treatment for 1 hour immediately before producing the device, placed in a vacuum evaporation apparatus, and evacuated until the degree of vacuum in the apparatus became 5 ⁇ 10 ⁇ 4 Pa or less.
- SEMICOCLEAN 56 trade name, manufactured by Furuuchi Chemical Co., Ltd.
- HAT-CN 6 was deposited to 10 nm as a hole injection layer, and HT-1 was deposited to 180 nm as a hole transport layer by resistance heating.
- the compound ET-1 is used as the electron transport material
- 2E-1 is used as the donor material
- the deposition rate ratio of the compound ET-1 and 2E-1 is 1: 1 so that the thickness is 35 nm. Stacked.
- Examples 2 to 20 and Comparative Examples 1 to 6 A light emitting device was produced and evaluated in the same manner as in Example 1 except that the compounds described in Tables 2 and 3 were used as the material of the light emitting layer. The results are shown in Tables 2-3. H-2 to H-10, D-6 and D-7 are compounds shown below.
- Example 21 A glass substrate (Geomatech Co., Ltd. product, 11 ⁇ / ⁇ , sputtered product) on which an ITO transparent conductive film was deposited at 165 nm was cut into 38 ⁇ 46 mm and etched. The obtained substrate was subjected to ultrasonic cleaning for 15 minutes with “SEMICOCLEAN 56” (trade name, manufactured by Furuuchi Chemical Co., Ltd.), and then washed with ultrapure water. The substrate was subjected to UV-ozone treatment for 1 hour just before producing the device, and was placed in a vacuum evaporation apparatus, and the apparatus was evacuated until the degree of vacuum in the apparatus became 5 ⁇ 10 ⁇ 4 Pa or less.
- SEMICOCLEAN 56 trade name, manufactured by Furuuchi Chemical Co., Ltd.
- HAT-CN 6 was deposited to 10 nm as a hole injection layer, and HT-1 was deposited to 180 nm as a hole transport layer by resistance heating.
- the compound ET-1 is used as the electron transport material
- 2E-1 is used as the donor material
- the deposition rate ratio of the compound ET-1 and 2E-1 is 1: 1 so that the thickness is 35 nm. Stacked.
- Comparative example 7 A light emitting device was produced and evaluated in the same manner as in Example 21 except that the compounds described in Table 2 were used as the material of the light emitting layer. The results are shown in Table 2.
- Example 1 high external quantum efficiency was achieved as compared to Comparative Example 1 not including the compound represented by the general formula (2). Above all, Example 1 satisfying Formula (i-1) achieved high external quantum efficiency as compared with Examples 2 and 3 not satisfying Formula (i-1).
- Example 21 which is a bottom emission device using D-3 as a compound represented by the general formula (1) and a bottom using a phosphorescent compound D-7 other than the compound represented by the general formula (1) Compared with Comparative Example 7 which is an emission element, although the case of using D-7 which is a phosphorescent light emitting element is superior in terms of external quantum efficiency, it is represented by the general formula (1) in terms of color purity. It can be seen that the case of using compound D-3 is largely superior.
- Example 7 and Example 21 in which D-3 was used as the compound represented by the general formula (1) very high color purity was obtained without significantly reducing the external quantum efficiency when used as a top emission device. We see that we can achieve it.
- Examples 22 to 35 A light emitting device was produced and evaluated in the same manner as in Example 1 except that the compounds described in Table 4 were used as the material of the electron transport layer. The results are shown in Table 4. ET-2 to ET-8 are compounds shown below.
- Examples 22 to 25 and 30 to 35 achieved high external quantum efficiency as compared with Examples 1 and 7 not containing the compound represented by the general formula (15).
- Example 36 After forming the hole injection layer, 170 nm of HT-1 is vapor deposited as a first hole transport layer, and then 10 nm of the compounds described in Table 5 as a second hole transport layer, and a hole transport layer having a total thickness of 180 nm A light emitting element was produced and evaluated in the same manner as in Example 1 except that the above were formed. The results are shown in Table 5.
- HT-2 to HT-6 are the following compounds.
- Examples 36 to 40 and 42 to 46 high external quantum efficiency is achieved as compared with Examples 1 and 7 which do not contain the monoamine compound having a spirofluorene skeleton in the hole transport layer on the anode side of the light emitting layer. did.
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Abstract
Description
遅延蛍光とは、準安定状態に一度エネルギーが保持され,その後放出されたエネルギーが光として放出される現象である。例えば、励起された後に一旦スピン多重度の異なる状態への遷移が起こり、そこから発光過程に入る現象が挙げられる。熱活性化遅延蛍光(TADF)現象の場合、励起された後に三重項励起子から一重項励起子への逆項間交差が生じ、一重項準位から発光が生じる。
本発明の実施の形態に係る発光素子は、陽極、陰極、およびそれら陽極と陰極との間に介在する有機層を有し、該有機層が電気エネルギーにより発光する。
本発明の実施の形態に係る発光素子では、少なくとも1つの発光層が、一般式(1)で表される化合物と一般式(2)で表される化合物とを含有する。特に限定されないが、一般式(1)で表される化合物をドーパントとして用い、一般式(2)で表される化合物をホスト材料として用いることが好ましい。
λ1(abs)は、一般式(1)で表される化合物の波長400nm以上900nm以下における吸収スペクトルのうち、最も長波長側のピークのピーク波長(nm)を表す。λ2(FL)は、一般式(2)で表される化合物の波長400nm以上900nm以下における蛍光スペクトルのうち、最も長波長側のピークのピーク波長(nm)を表す。
数式(i-2)を満たす場合、一般式(2)で表される化合物の蛍光スペクトルと、一般式(1)で表される化合物の吸収スペクトルとの重なりがさらに大きくなるので、一般式(2)で表される化合物から一般式(1)で表される化合物へのエネルギー移動が特に効率的に進行する。そのため、一般式(2)で表される化合物由来の発光が十分に抑制され、さらに効率的な励起エネルギーの利用と、より色純度高い発光の達成が可能である。
本発明の実施の形態に係る発光素子において、陽極および陰極は、素子の発光のために十分な電流を供給するための役割を有するものである。光を取り出すために、陽極および陰極の少なくとも一方は透明または半透明であることが好ましい。通常、基板上に形成される陽極を透明電極とする。
正孔輸送層は、正孔輸送材料の一種または二種以上を積層または混合する方法、もしくは、正孔輸送材料と高分子結着剤との混合物を用いる方法により形成される。また、正孔輸送材料は、正極からの正孔を効率良く輸送することが好ましい。そのため、正孔注入効率が高く、注入された正孔を効率良く輸送するものであることが好ましい。
本発明の実施の形態に係る発光素子において、陽極と正孔輸送層との間に正孔注入層を設けてもよい。正孔注入層を設けることで発光素子が低駆動電圧化し、耐久寿命も向上する。
本発明において、電子輸送層とは、陰極と発光層との間にある層である。電子輸送層は単層でも複数層であってもよく、陰極もしくは発光層に接していてもいいし、接していなくてもよい。
本発明の実施の形態に係る発光素子において、陰極と電子輸送層との間に電子注入層を設けてもよい。一般的に、電子注入層は、陰極から電子輸送層への電子の注入を助ける目的で挿入される。電子注入層には、電子受容性窒素を含むヘテロアリール環構造を有する化合物を用いてもよいし、上記のドナー性材料を含有する層を用いてもよい。
本発明の実施の形態に係る発光素子において、電荷発生層とは、上記のタンデム構造型素子における、陽極と陰極の間にある中間層であり、電荷分離により正孔および電子を発生させる層である。電荷発生層は、一般に、陰極側のP型層と陽極側のN型層から形成される。これらの層には、効率的な電荷分離と、生じたキャリアの効率的な輸送が望まれる。
化合物の吸収スペクトルは、U-3200形分光光度計(日立製作所株式会社製)を用い、化合物を2-メチルテトラヒドロフランに1×10-6mol/Lの濃度で溶解させて測定を行った。
化合物の蛍光スペクトルは、F-2500形分光蛍光光度計(日立製作所株式会社製)を用い、化合物を2-メチルテトラヒドロフランに1×10-6mol/Lの濃度で溶解させ、波長350nmで励起させた際の蛍光スペクトルを測定した。
Ag0.98Pd0.01Cu0.01合金100nmとITO透明導電膜10nmを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10nm、正孔輸送層として、HT-1を180nm蒸着した。次に、発光層として、ホスト材料H-1と、一般式(1)で表される化合物D-1と、一般式(2)で表される化合物B-1とを、重量比で80:1:20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ET-1を、ドナー性材料として2E-1を用い、化合物ET-1と2E-1の蒸着速度比が1:1になるようにして35nm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、マグネシウムと銀を15nm共蒸着して陰極とし、5×5mm角のトップエミッション素子を作製した。この発光素子は、発光ピーク波長625nm、半値幅46nmの高色純度発光を示した。また、この発光素子を、輝度1000cd/m2で発光させた時の外部量子効率は5.0%であった。結果を表2に示す。なお、HAT-CN6、HT-1、ET-1、2E-1は下記に示す化合物である。
発光層の材料として表2~3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製し、評価した。結果を表2~3に示す。なお、H-2~H-10、D-6、D-7は下記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10nm、正孔輸送層として、HT-1を180nm蒸着した。次に、発光層として、ホスト材料H-1と、一般式(1)で表される化合物D-3と、一般式(2)で表される化合物B-1とを、重量比で80:1:20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ET-1を、ドナー性材料として2E-1を用い、化合物ET-1と2E-1の蒸着速度比が1:1になるようにして35nm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角のボトムエミッション素子を作製した。この発光素子は、発光ピーク波長519nm、半値幅30nmの高色純度発光を示した。また、この発光素子を、輝度1000cd/m2で発光させた時の外部量子効率は4.4%であった。結果を表2に示す。
発光層の材料として表2に記載した化合物を用いた以外は実施例21と同様にして発光素子を作製し、評価した。結果を表2に示す。
電子輸送層の材料として表4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4に示す。なおET-2~ET-8は下記に示す化合物である。
正孔注入層形成後に、第1正孔輸送層としてHT-1を170nm蒸着し、その後、第2正孔輸送層として表5に記載した化合物を10nm蒸着し、合計厚み180nmの正孔輸送層を形成した以外は、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5に示す。なおHT-2~HT-6は下記に示す化合物である。
Claims (34)
- 陽極と陰極との間に発光層を含む複数の有機層を有し、電気エネルギーにより発光する発光素子であって、
前記発光層が、一般式(1)で表される化合物および遅延蛍光性の化合物を含む発光素子。
- 波長400nm以上900nm以下の範囲で単一ピークを示す蛍光を発する、請求項1または2に記載の発光素子。
- 前記単一ピークの半値幅が60nm以下である、請求項3に記載の発光素子。
- トップエミッション方式である、請求項1~4のいずれかに記載の発光素子。
- 下記数式(i-1)を満たす、請求項1~5のいずれかに記載の発光素子。
|λ1(abs)-λ2(FL)|≦50 (i-1)
(λ1(abs)は、一般式(1)で表される化合物の波長400nm以上900nm以下における吸収スペクトルのうち、最も長波長側のピークのピーク波長(nm)を表す。λ2(FL)は、一般式(2)で表される化合物の波長400nm以上900nm以下における蛍光スペクトルのうち、最も長波長側のピークのピーク波長(nm)を表す。) - 前記発光層中、一般式(1)で表される化合物の含有量が5wt%以下であり、一般式(2)で表される化合物の含有量が70wt%以下である、請求項1~6のいずれかに記載の発光素子。
- A1が下記一般式(3)または(4)から選ばれる、請求項2~7のいずれかに記載の発光素子。
- 一般式(2)において、A1が一般式(3)で表される、請求項2~8のいずれかに記載の発光素子。
- 一般式(2)において、A2が下記一般式(6)または(7)で表される、請求項2~10のいずれかに記載の発光素子。
- 一般式(2)において、A2が一般式(6)で表される、請求項2~11のいずれかに記載の発光素子。
- 前記発光層が、さらに、一般式(14)で表される化合物を含む、請求項1~12のいずれかに記載の発光素子。
- 一般式(14)において、L4が、R56とR57のうち1つの位置、およびR60とR61のうち1つの位置と連結する、請求項13に記載の発光素子。
- 一般式(14)において、L4が単結合である、請求項13または14に記載の発光素子。
- 一般式(14)において、Ar6とAr7が異なる、請求項13~15のいずれかに記載の発光素子。
- 一般式(14)において、Ar6およびAr7が、それぞれ同じでも異なっていてもよく、置換もしくは無置換の、フェニル基、ビフェニル基、ターフェニル基、ナフチル基、フルオレニル基、フェナントリル基、トリフェニレニル基から選ばれる、請求項13~16のいずれかに記載の発光素子。
- 一般式(14)において、R64がアリール基である、請求項13~18のいずれかに記載の発光素子。
- 一般式(14)において、R64が置換もしくは無置換の、フェニル基、ビフェニル基、ターフェニル基、ナフチル基、フルオレニル基、フェナントリル基、トリフェニレニル基である、請求項13~19のいずれかに記載の発光素子。
- 発光層の陽極側に、スピロフルオレン骨格を有するモノアミン化合物を含む正孔輸送層を有する、請求項1~20のいずれか記載の発光素子。
- 前記スピロフルオレン骨格を有するモノアミン化合物の窒素原子の置換基のうち、少なくとも一つが置換もしくは無置換のp-ビフェニル基、置換もしくは無置換のp-ターフェニル基、置換もしくは無置換の2-フルオレニル基、置換もしくは無置換のジベンゾフラ二ル基を含む基であることを特徴とする、請求項21に記載の発光素子。
- 前記一般式(15)において、Ar8~Ar10のうち、少なくともひとつが、置換もしくは無置換の、フェニル基、ビフェニル基、ナフチル基、フルオレニル基である、請求項23に記載の発光素子。
- 発光層の陰極側にフェナントロリン骨格を有する化合物を含む電子輸送層を有する請求項1~22のいずれかに記載の発光素子。
- 前記一般式(16)において、pが2である、請求項26に記載の発光素子。
- 一般式(1)において、XはC-R7であり、R7が置換もしくは無置換のフェニル基である、請求項1~27のいずれかに記載の発光素子。
- 一般式(1)において、R1、R3、R4、R6が全て、それぞれ同じでも異なっていてもよく、置換もしくは無置換のフェニル基である、請求項1~28のいずれかに記載の発光素子。
- 一般式(1)において、R1、R3、R4、R6が全て、それぞれ同じでも異なっていてもよく、置換もしくは無置換のアルキル基である、請求項1~28のいずれかに記載の発光素子。
- R1~R7のうち少なくとも1つが電子求引基である、請求項1~30のいずれかに記載の発光素子。
- 請求項1~31のいずれかに記載の発光素子を含むディスプレイ。
- 請求項1~31のいずれかに記載の発光素子を含む照明装置。
- 請求項1~31のいずれかに記載の発光素子を含むセンサ。
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KR102515298B1 (ko) | 2023-03-29 |
CN110892541A (zh) | 2020-03-17 |
US20210151683A1 (en) | 2021-05-20 |
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