WO2002064700A1 - Dispositif d'electroluminescence organique, materiau luminescent, et compose organique - Google Patents
Dispositif d'electroluminescence organique, materiau luminescent, et compose organique Download PDFInfo
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- WO2002064700A1 WO2002064700A1 PCT/JP2002/001162 JP0201162W WO02064700A1 WO 2002064700 A1 WO2002064700 A1 WO 2002064700A1 JP 0201162 W JP0201162 W JP 0201162W WO 02064700 A1 WO02064700 A1 WO 02064700A1
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- 239000000463 material Substances 0.000 title claims description 54
- 150000002894 organic compounds Chemical class 0.000 title claims description 17
- 238000005401 electroluminescence Methods 0.000 title claims 2
- 238000002347 injection Methods 0.000 claims abstract description 47
- 239000007924 injection Substances 0.000 claims abstract description 47
- 229910052741 iridium Inorganic materials 0.000 claims abstract description 25
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 125000001424 substituent group Chemical group 0.000 claims description 75
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 57
- 125000005843 halogen group Chemical group 0.000 claims description 53
- 150000001875 compounds Chemical class 0.000 claims description 39
- 150000003248 quinolines Chemical class 0.000 claims description 27
- 230000000903 blocking effect Effects 0.000 claims description 22
- 238000004020 luminiscence type Methods 0.000 claims description 13
- 125000004122 cyclic group Chemical group 0.000 claims description 7
- BNASDYJRNOLPQY-UHFFFAOYSA-N iridium 2-phenylquinoline Chemical group [Ir].c1ccc(cc1)-c1ccc2ccccc2n1.c1ccc(cc1)-c1ccc2ccccc2n1.c1ccc(cc1)-c1ccc2ccccc2n1 BNASDYJRNOLPQY-UHFFFAOYSA-N 0.000 claims description 4
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims 2
- 125000004429 atom Chemical group 0.000 claims 1
- 235000010290 biphenyl Nutrition 0.000 claims 1
- 239000004305 biphenyl Substances 0.000 claims 1
- 150000002504 iridium compounds Chemical class 0.000 abstract description 27
- 230000005281 excited state Effects 0.000 abstract description 22
- 230000005525 hole transport Effects 0.000 abstract description 21
- 239000000758 substrate Substances 0.000 abstract description 9
- 239000011521 glass Substances 0.000 abstract description 8
- 230000007704 transition Effects 0.000 abstract description 4
- 125000002943 quinolinyl group Chemical class N1=C(C=CC2=CC=CC=C12)* 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 147
- 239000002019 doping agent Substances 0.000 description 18
- 239000011368 organic material Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- VFUDMQLBKNMONU-UHFFFAOYSA-N 9-[4-(4-carbazol-9-ylphenyl)phenyl]carbazole Chemical group C12=CC=CC=C2C2=CC=CC=C2N1C1=CC=C(C=2C=CC(=CC=2)N2C3=CC=CC=C3C3=CC=CC=C32)C=C1 VFUDMQLBKNMONU-UHFFFAOYSA-N 0.000 description 7
- 229940126214 compound 3 Drugs 0.000 description 7
- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 6
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000005284 excitation Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 125000001624 naphthyl group Chemical group 0.000 description 5
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 4
- 230000005283 ground state Effects 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- CUJRVFIICFDLGR-UHFFFAOYSA-N acetylacetonate Chemical compound CC(=O)[CH-]C(C)=O CUJRVFIICFDLGR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- JVZRCNQLWOELDU-UHFFFAOYSA-N gamma-Phenylpyridine Natural products C1=CC=CC=C1C1=CC=NC=C1 JVZRCNQLWOELDU-UHFFFAOYSA-N 0.000 description 3
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000012044 organic layer Substances 0.000 description 3
- AZFHXIBNMPIGOD-LNTINUHCSA-N (z)-4-hydroxypent-3-en-2-one;iridium Chemical compound [Ir].C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O AZFHXIBNMPIGOD-LNTINUHCSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910017911 MgIn Inorganic materials 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 125000004093 cyano group Chemical group *C#N 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000000295 emission spectrum Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- UZGLIIJVICEWHF-UHFFFAOYSA-N octogen Chemical group [O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)CN([N+]([O-])=O)C1 UZGLIIJVICEWHF-UHFFFAOYSA-N 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- AYEKOFBPNLCAJY-UHFFFAOYSA-O thiamine pyrophosphate Chemical compound CC1=C(CCOP(O)(=O)OP(O)(O)=O)SC=[N+]1CC1=CN=C(C)N=C1N AYEKOFBPNLCAJY-UHFFFAOYSA-O 0.000 description 2
- DANYXEHCMQHDNX-UHFFFAOYSA-K trichloroiridium Chemical compound Cl[Ir](Cl)Cl DANYXEHCMQHDNX-UHFFFAOYSA-K 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- STTGYIUESPWXOW-UHFFFAOYSA-N 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline Chemical compound C=12C=CC3=C(C=4C=CC=CC=4)C=C(C)N=C3C2=NC(C)=CC=1C1=CC=CC=C1 STTGYIUESPWXOW-UHFFFAOYSA-N 0.000 description 1
- POXIZPBFFUKMEQ-UHFFFAOYSA-N 2-cyanoethenylideneazanide Chemical group [N-]=C=[C+]C#N POXIZPBFFUKMEQ-UHFFFAOYSA-N 0.000 description 1
- 229910000846 In alloy Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229940027991 antiseptic and disinfectant quinoline derivative Drugs 0.000 description 1
- HFACYLZERDEVSX-UHFFFAOYSA-N benzidine Chemical compound C1=CC(N)=CC=C1C1=CC=C(N)C=C1 HFACYLZERDEVSX-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 125000002541 furyl group Chemical group 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- RBTKNAXYKSUFRK-UHFFFAOYSA-N heliogen blue Chemical compound [Cu].[N-]1C2=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=NC([N-]1)=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=N2 RBTKNAXYKSUFRK-UHFFFAOYSA-N 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- HLYTZTFNIRBLNA-LNTINUHCSA-K iridium(3+);(z)-4-oxopent-2-en-2-olate Chemical compound [Ir+3].C\C([O-])=C\C(C)=O.C\C([O-])=C\C(C)=O.C\C([O-])=C\C(C)=O HLYTZTFNIRBLNA-LNTINUHCSA-K 0.000 description 1
- 239000000990 laser dye Substances 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 naphthalen-l-yl Chemical group 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical group CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- JZRYQZJSTWVBBD-UHFFFAOYSA-N pentaporphyrin i Chemical compound N1C(C=C2NC(=CC3=NC(=C4)C=C3)C=C2)=CC=C1C=C1C=CC4=N1 JZRYQZJSTWVBBD-UHFFFAOYSA-N 0.000 description 1
- YYMBJDOZVAITBP-UHFFFAOYSA-N rubrene Chemical compound C1=CC=CC=C1C(C1=C(C=2C=CC=CC=2)C2=CC=CC=C2C(C=2C=CC=CC=2)=C11)=C(C=CC=C2)C2=C1C1=CC=CC=C1 YYMBJDOZVAITBP-UHFFFAOYSA-N 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- YNHJECZULSZAQK-UHFFFAOYSA-N tetraphenylporphyrin Chemical compound C1=CC(C(=C2C=CC(N2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3N2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 YNHJECZULSZAQK-UHFFFAOYSA-N 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Classifications
-
- 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
- C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
- C07F15/0006—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table compounds of the platinum group
- C07F15/0033—Iridium compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
- H10K85/342—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising iridium
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/10—Triplet emission
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
- H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
Definitions
- the present invention relates to an organic electroluminescent device, a light emitting material, and an organic compound. m view: skill
- Organic electroluminescent devices (hereinafter referred to as organic EL devices) are expected to be new self-luminous devices.
- the organic EL device has a laminated structure in which a carrier transport layer (an electron transport layer or a hole transport layer) and a light emitting layer are formed between a hole injection electrode and an electron injection electrode. '
- an electrode material having a large work function such as gold or ITO (indium-tin oxide) is used, and for the electron injection electrode, such as Mg (magnesium) or Li (lithium).
- An electrode material with a small work function is used.
- Organic materials are used for the hole transport layer, the light emitting layer, and the electron transport layer.
- a material having P-type semiconductor properties is used for the hole transport layer, and a material having n-type semiconductor properties is used for the electron transport layer.
- the light emitting layer also has a carrier transporting property such as an electron transporting property or a hole transporting property and is made of an organic material that emits fluorescence or phosphorescence. '
- hole injection electrode, hole transport layer, light emitting layer, electron transport layer and electron injection electrode are laminated in this order to form an organic EL device.
- each functional layer of the hole transport layer, the electron transport layer, and the light emitting layer may be composed of a plurality of layers or may be omitted.
- a light emitting layer and a light emitting layer are provided between a hole injection electrode and an electron injection electrode.
- the electron transport layer There are only two organic layers, the electron transport layer. It is a light emitting material called NSD This is because the light-emitting layer formed of the material has a good hole-transport property, and thus the light-emitting layer also serves as the hole-transport layer.
- the device structure shown in CWTang et al., Appl. Phys. Lett., Vol. 51, pp. 913-915 (1987) consists of two organic layers, a hole transport layer and a light-emitting layer. ing.
- tris (8-hydroxyquinolinato) aluminum (hereinafter referred to as A1Q) in the light-emitting layer plays two roles of light emission and electron transport.
- the device structure shown in SA VanSlyke et al., Ap. Phys. Lett., Vol. 69, pp. 2160-2162 (1996) has three layers: a hole injection layer, a hole transport layer, and a light emitting layer. It is composed of organic layers.
- the hole injection layer is made of copper phthalocyanine and has the same function as the hole transport layer. In the device as a whole, there are two hole transport layers.
- the number of the electron transport layer, the hole transport layer, and the light emitting layer can be freely adjusted depending on the organic material used.
- organic EL device visible light from blue to red can be obtained by selecting an organic material constituting a light emitting layer. Therefore, full-color display can be realized by using organic EL elements that emit monochromatic light of each of the three primary colors (RGB) of light, red, green, and blue.
- RGB primary colors
- red light green light and blue light obtained by the organic EL device
- stable light is green light and blue light.
- red to orange light it is difficult to obtain light with high luminance and high luminous efficiency. This is because there is no solid organic material that efficiently emits red to orange fluorescence or phosphorescence.
- an organic material of a light-emitting layer of an organic EL device that emits red to orange light (4- (dicyanomethylene) -2-methyl-6-dulodin- having a structure represented by the following formula (10) is mainly used.
- 4 -yl-vinyl) -4H-pyran ((4- (di cyanomethy 1 ene)-2-methyl-6- julodin-4-yl-vinyl) -4H-pyran: hereinafter referred to as DCM)
- DCM a laser dye-based material such as DCM-based material is used.
- DCM-based material is used.
- An object of the present invention is to provide an organic EL device capable of obtaining high luminance red to orange light with high luminous efficiency.
- Another object of the present invention is to provide a light emitting material capable of obtaining high luminance red to orange light with high luminous efficiency.
- Still another object of the present invention is to provide an organic compound used for an organic EL device capable of obtaining high luminance red to orange light with high luminous efficiency.
- An organic electroluminescent device is an organic electroluminescent device having a light emitting layer between a hole injection electrode and an electron injection electrode, wherein the light emitting layer is composed of iridium and a quinoline derivative. It contains a compound of the formula
- the light-emitting layer contains a compound composed of indium and a quinoline derivative.
- the compound composed of iridium and the quinoline derivative is a material capable of emitting light via a triplet excited state, usually, in the light emitting layer of the organic electro-i / luminescence element, It is possible to emit red to orange light by effectively utilizing the triplet excited state that cannot be effectively used.
- the light-emitting layer may itself be composed of a compound composed of iridium and a quinoline derivative.
- the light emitting layer is composed of an iridium and a quinoline derivative as dopants. May be added.
- the compound composed of iridium and a quinoline derivative has a molecular structure represented by the following formula (1), wherein R 1 in the formula (1) is a hydrogen atom, a halogen atom or a substituent, and A is It is preferably a group.
- a light emitting layer composed of a compound having such a molecular structure can emit red to orange light via a triplet excited state. Therefore, it is possible to achieve high-luminance red to orange light emission with high light emission efficiency.
- A has a molecular structure represented by the following formula (A1), and R 2 in the formula (1) is a hydrogen atom, a halogen atom or a substituent. You may.
- A has a molecular structure represented by the following formula (A2), and R 3 in the formula (A2) is a hydrogen atom, a halogen atom or a substituent. Is also good. Further, in the compound represented by the formula (1), A may have a molecular structure represented by the following formula (A3), and R4 in the formula (A3) may be a hydrogen atom, a halogen atom or a substituent. Good.
- A has a molecular structure represented by the following formula (A4), and R 5 in the formula (A4) is a hydrogen atom, a halogen atom or a substituent. Is also good.
- A has a molecular structure represented by the following formula (A5), and R 6 in the formula (A5) is a hydrogen atom, a halogen atom or a substituent. Is also good.
- A has a molecular structure represented by the following formula (A6), and R 7 in the formula (A6) is a hydrogen atom, a halogen atom or a substituent. Is also good.
- A has a molecular structure represented by the following formula (A7), and R 8 in the formula (A7) is a hydrogen atom, a halogen atom or a substituent. Is also good.
- A has a molecular structure represented by the following formula (A8), and R 9 in the formula (A8) is a hydrogen atom, a halogen atom, or a substituent. Is also good.
- A has a molecular structure represented by the following formula (A9), and R 10 in the formula (A9) is a hydrogen atom, a halogen atom or a substituent. You may.
- A has a molecular structure represented by the following formula (A10), and R 11 in the formula (A10) is a hydrogen atom, a halogen atom, or a substituent. You can.
- A has a molecular structure represented by the following formula (All), and R 12 in the formula (Al 1) represents a hydrogen atom, a halogen atom or a substituent. It may be.
- the compound composed of iridium and a quinoline derivative has a molecular structure represented by the following formula (2), wherein R21 in the formula (2) is a hydrogen atom, a halogen atom or a substituent, and A is a substituent And D is preferably a substituent forming a cyclic structure.
- D has a molecular structure represented by the following formula (D1), and R22 and R23 in the formula (D1) are the same or different and may be a hydrogen atom, a halogen atom or a substituent.
- D has a molecular structure represented by the following formula (D2), and R 24 in the formula (D2) may be a hydrogen atom, a halogen atom or a substituent.
- A has a molecular structure represented by the following formula (A12), and R 13 in the formula (A12) is a hydrogen atom, an octogen atom or a substituent. You can.
- A has a molecular structure represented by the following formula (A13), and R 14 in the formula (A13) is a hydrogen atom, an octogen atom or a substituent. You can.
- A has a molecular structure represented by the following formula (A14), and R 15 in the formula (A14) is a hydrogen atom, a halogen atom or a substituent. You can.
- A has a molecular structure represented by the following formula (A15), and R 16 in the formula (A15) represents a hydrogen atom, a halogen atom or a substituent. It may be.
- A has a molecular structure represented by the following formula (A16), and R 17 in the formula (A16) is a hydrogen atom, a halogen atom or a substituent. You may use it.
- the compound composed of iridium and a quinoline derivative may be tris (2-phenylquinoline) iridium having a molecular structure represented by the following formula (8).
- the light emitting layer may further include a host material, and the content of the compound composed of the iridium and the quinoline derivative may be from 0.1% by weight to 50% by weight based on the host material. As described above, even when a compound composed of a iridium and a quinoline derivative is added as a dopant in the light-emitting layer, high-luminance red to orange light can be obtained with high luminous efficiency.
- the host material may be 4,4'-bis (carbazol-9-yl) biphenyl having a molecular structure represented by the following formula (9).
- red to orange light can be obtained with high luminous efficiency and high luminance.
- a hole blocking layer having a higher ionization potential than the light emitting layer is provided between the light emitting layer and the electron injection electrode.
- the provision of such a hole blocking layer increases the energy barrier between the light emitting layer and the hole blocking layer. For this reason, it is possible to prevent holes from being injected from the light emitting layer to the electron injection electrode side, and it is possible to efficiently recombine electrons and holes in the light emitting layer. This makes it possible to improve the luminous efficiency of the organic EL device.
- a light emitting material has a molecular structure represented by the following formula (2), wherein R 21 in the formula (2) is a hydrogen atom, a halogen atom or a substituent, and A is D is a substituent forming a cyclic structure,
- D has a molecular structure represented by the following formula (D1), wherein R22 and R23 in the formula (D1) are the same or different, and may be a hydrogen atom, a halogen atom or a substituent.
- D has a molecular structure represented by the following formula (D2), and R24 in the formula (D2) may be a hydrogen atom, a halogen atom or a substituent.
- Such a light-emitting material is a material that can emit light through a triplet excited state, it can emit red to orange light.
- An organic compound according to still another aspect of the present invention has a molecular structure represented by the following formula (2).
- R 21 is a hydrogen atom, a halogen atom or a substituent
- A is a substituent
- D is a substituent forming a cyclic structure.
- D has a molecular structure represented by the following formula (D 1), wherein R 22 and R 23 in the formula (D 1) are the same or different and may be a hydrogen atom, a halogen atom or a substituent .
- D has a molecular structure represented by the following formula (D2), and R 24 in the formula (D2) may be a hydrogen atom, a halogen atom or a substituent.
- the organic compound may have a molecular structure represented by the following formula (C 1) (
- the organic compound may have a molecular structure represented by the following formula (C 2) (
- the organic compound may have a molecular structure represented by the following formula (C7) c
- the organic compound may have a molecular structure represented by the following formula (C 8) c
- FIG. 1 is a schematic diagram showing the structure of an organic EL device according to one embodiment of the present invention.
- FIG. 2 is a diagram showing a light emission spectrum in the organic EL device of the example.
- FIG. 1 is a schematic diagram showing a structure of an organic electroluminescent device (hereinafter, referred to as an organic EL device) according to an embodiment of the present invention.
- a hole injection electrode (anode) 2 made of a transparent electrode film is formed on a glass substrate 1.
- a hole injection layer 3 made of an organic material, a hole transport layer 4 made of an organic material, and a light emitting layer 5 made of an organic material are formed in this order.
- a hole blocking layer 6 made of an organic material is formed on the light emitting layer 5, and an electron injection electrode (cathode) 7 is formed on the hole blocking layer 6.
- the light emitting layer 5 contains an organic iridium compound composed of a quinoline derivative and a metal iridium.
- the light-emitting layer 5 may be itself composed of such an organic iridium compound, or may contain such an organic iridium compound as a light-emitting dopant.
- a host material described below is used as a light emitting dopant.
- organic iridium compounds comprising quinoline and quinoline derivatives.
- the content of the organic iridium compound is from 0.1% by weight to 50% by weight relative to the host material, and preferably from 1% by weight to 10% by weight.
- CBP 4,4'-bis (carbazole-9-yl) biphenyl (4,4'-bis (carbazol-9) having a molecular structure represented by the following formula (9) is used.
- -yl) bipheny 1 hereinafter referred to as CBP).
- the organic iridium compound contained in the light emitting layer 5 preferably has a molecular structure represented by the following formula (1).
- R 1 in the formula (1) represents a hydrogen atom, a halogen atom or a substituent
- A represents a substituent described later.
- a in the above formula (1) may be any of the substituents having a molecular structure represented by, for example, the following formulas (A1) to (All).
- R 2 to R 12 in the formulas (Al) to (All) are a hydrogen atom, a halogen atom or a substituent.
- the organic iridium compound composed of iridium and a quinoline derivative and having the structure represented by the above formula (1) can emit red to orange phosphorescence via a triplet excited state.
- the organic iridium compound represented by the above formula (1) is obtained by reacting a quinoline derivative having a molecular structure represented by the following formula (B1) with an iridium compound, and coordinating or chelating the quinoline derivative to the iridium. Manufactured. In this case, 3 mo 1 or more of the quinoline derivative is reacted with 1 mo 1 of the iridium compound.
- the iridium compound tris (acetylacetonato) iridium (Ir (acac) 3 ), iridium chloride, or the like can be used.
- acac is an abbreviation for “acetylacetone”.
- triplet excited states with parallel electron spins are generated at a ratio of about three-quarters of the total excited states generated by the bond between electrons and holes, and about four minutes At a ratio of 1, the electron spins are antiparallel and the sum of spin quantum numbers becomes 0. It is believed that a singlet excited state is generated.
- Fluorescence is spin-tolerant and occurs easily. For this reason, fluorescence is widely used in light emission phenomena of organic EL devices and the like.
- the aforementioned DCM-based material used as a light-emitting material of a conventional red light-emitting organic EL element emits red fluorescence via a singlet excited state.
- the triplet excited state which occupies about three quarters, cannot be used effectively. Therefore, it is difficult to improve the luminous efficiency of the organic EL device having the light emitting layer made of such a DCM red light emitting material.
- the light emitting layer 5 is an organic iridium compound having a structure represented by the above formula (1) as a red to orange light emitting material. Therefore, the light-emitting layer 5 can emit red to orange phosphorescence via the triplet excited state. Thus, in this case, it is possible to effectively use the triplet excited state that represents about three-quarters of the entire excited state. As a result, in the organic EL element 100, it is possible to obtain red to orange light with high luminance with high luminous efficiency.
- an organic iridium compound having a molecular structure represented by the above formula (1) was used.
- An organic iridium compound having a similar structure is disclosed.
- the organic iridium compound disclosed herein is a compound in which phenylpyridine and iridium are combined, and therefore has a ⁇ -conjugated electron system compared to a compound in which a quinoline derivative and iridium are combined as in this example. Is short. Therefore, the emission color of the organic iridium compound comprising phenylpyridine and iridium disclosed in this document is green.
- the spectrum can be shifted to the red to orange region, and an organic EL device capable of emitting red to orange light can be realized.
- the organic iridium compound contained in the light emitting layer 5 preferably has a molecular structure represented by the following formula (2).
- R21 represents a hydrogen atom, an octane atom or a substituent
- ⁇ represents a substituent described below
- D represents a substituent forming a cyclic structure.
- D in the above formula (2) may be, for example, a substituent having a molecular structure represented by the following formula (D1) or (D2).
- R22 to R24 in the formulas (Dl) and (D2) are a hydrogen atom, a halogen atom or a substituent.
- a in the above formula (2) may be, for example, any of the substituents having a molecular structure represented by the following formulas (A12) to (A16).
- R13 to R17 in the formulas (A12) to (A16) are a hydrogen atom, a halogen atom or a substituent.
- the organic iridium compound having the structure represented by the above formula (2) which is composed of iridium and a quinoline derivative, can emit red to orange phosphorescence via a triplet excited state.
- the organic iridium compound represented by the above formula (2) includes a quinoline derivative having a molecular structure represented by the following formula (B2), an iridium compound, and D represented by the above formula (D1) or (D2). It is produced by reacting a corresponding compound and coordinating or chelating a quinoline derivative and D with iridium. In this case, the quinoline derivative is added to 1.5 to 2.5 mo 1 and D to 1 mo 1 of the iridium compound. The compound corresponding to is reacted with 0.5 to 1.5 mo 1.
- the iridium compound tris (acetylacetonato) iridium (I r (acac) 3 ), iridium chloride, or the like can be used.
- acac is an abbreviation for “ace tyl acetone”.
- the structure of the organic EL device according to the present invention is not limited to the above structure, and various structures can be used.
- a structure in which only two layers of a light emitting layer and an electron transport layer are provided between the hole injection electrode 2 and the electron injection electrode 7 may be used.
- a structure in which a hole transport layer, a light emitting layer, a hole blocking layer, and an electron transport layer are sequentially stacked between the hole injection electrode 2 and the electron injection electrode 7 may be employed.
- a hole blocking layer having a higher ionization potential than the light emitting layer between the light emitting layer and the electron injection electrode.
- an energy barrier between the light emitting layer and the hole blocking layer can be increased. This makes it possible to prevent holes from being injected from the light emitting layer into the layer on the electron injection electrode side (for example, the electron transport layer or the electron injection layer), and to efficiently generate holes in the light emitting layer. It becomes possible to recombine with electrons. As a result, it is possible to improve the luminous efficiency of the organic EL device.
- the organic EL element 100 described above by applying a voltage between the hole injection electrode 2 and the electron injection electrode 7, the light emitting layer 5 of the organic EL element 100 emits red to orange light, and the glass substrate Light is emitted from the back surface of 1.
- Example 1 a hole injection electrode (anode) and a hole transport layer were formed on a glass substrate.
- An organic EL device in which a light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection electrode (cathode) were sequentially stacked was used.
- the hole injection electrode of the organic EL device is made of indium tin oxide (ITO) having a thickness of 100 OA.
- the hole transport layer has a thickness of 500 A and has a molecular structure represented by the following formula (11): ⁇ , ⁇ '-di (naphthylene-1-yl) - ⁇ , ⁇ '-diphenyl -Benzidine ( ⁇ , N'-Di (naphthalen-l-yl) -N, N'-dipheny benzidine: hereinafter referred to as NPB).
- the light-emitting layer 5 has a thickness of 20 OA, contains CBP having a molecular structure represented by the following formula (9) as a host material, and has a molecular structure represented by the following formula (8) as a red-orange luminescent dopant.
- CBP having a molecular structure represented by the following formula (9) as a host material
- a molecular structure represented by the following formula (8) as a red-orange luminescent dopant Tris (2-phenylquinoline) iridium (tris (2-phenylquinoline) iridium: hereinafter referred to as Ir (Pq) 3 ). This Ir (Phq) 3 can emit red to orange light via a triplet excited state.
- the light emitting layer 5 contains 6.5% by weight of Ir (Ph q) 3 with respect to the host material CBP.
- the ionization potential of the host material CBP is 5.9 eV.
- the hole blocking layer has a thickness of 10 OA and is made of bathocuproine (hereinafter referred to as BCP) having a molecular structure represented by the following formula (12).
- BCP bathocuproine
- the hole blocking layer composed of such a BCP has an ionization potential of 6.2 eV, which is larger than that of CBP, which is the host material of the light emitting layer.
- the electron transport layer has a thickness of 15 OA and is composed of tris (8-hydroxyquinolinato) aluminum (hereinafter referred to as AlQ) having a molecular structure represented by the following formula (13).
- AlQ tris (8-hydroxyquinolinato) aluminum
- the ionization potential of such an electron transport layer composed of A 1 q is 5.5 eV.
- the hole blocking layer having a large ionization potential is formed between the light emitting layer and the electron transport layer as described above, the energy barrier between the light emitting layer and the hole blocking layer is reduced. growing. For this reason, it is possible to prevent holes from being injected from the light emitting layer into the electron transport layer. This makes it possible to efficiently recombine holes and electrons in the light emitting layer. As a result, it is possible to improve the luminous efficiency of the organic EL device.
- the electron injection electrode is made of a MgIn alloy having a thickness of 2000 A (ratio: 10: 1).
- the organic EL device having the above structure was manufactured as follows. First, a hole injection electrode made of indium-tin oxide (ITO) was formed on a glass substrate. Next, the glass substrate on which the hole injection electrode was formed was washed with a neutral detergent, and then ultrasonically washed for 10 minutes in acetone and 10 minutes in ethanol. Further, the surface of the glass substrate was cleaned with an ozone cleaner.
- ITO indium-tin oxide
- a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection electrode were sequentially stacked on the hole injection electrode made of ITO by a vacuum evaporation method.
- Each of these depositions was performed at room temperature without controlling the substrate temperature at a degree of vacuum of 1 ⁇ 10 ′′ 6 Torr.
- a positive bias voltage was applied to the hole injection electrode and a negative bias voltage was applied to the electron injection electrode of the organic EL device manufactured by the above method, and the light emission characteristics of this device were measured.
- the maximum luminance of the organic EL element is 34, 200 c dZm 2, luminous efficiency at this time was 1 5. 7 c dZA.
- Example 2 an organic EL device having the same structure as the organic EL device of Example 1 was used except for the following points.
- the organic EL device of Example 2 was manufactured by the same method as the method for manufacturing the organic EL device of Example 1.
- the hole blocking layer has a molecular structure represented by the following formula (14) ((1,1′-bisphenyl) -4-olato) (2-methyl-8-quinolinola) To N1, 08) Aluminum (((1, 1'-Bisphenyl) —4'-Olato) (2-methythy 8- qui no 1 i no la te- Nl, 08) Aluminimn: Hereinafter referred to as BA la ).
- the hole blocking layer composed of such BA I Q has a thickness of 100 A and an ionization potential of 5.6 eV.
- the organic EL device of the present example in which the hole blocking layer having such a large ionization potential is formed between the light emitting layer and the electron transport layer, —Because the energy barrier between the electron transport layer and the electron blocking layer is large, it is possible to prevent holes from being injected from the light emitting layer into the electron transport layer. This makes it possible to efficiently recombine holes and electrons in the light emitting layer. As a result, the luminous efficiency of the organic EL device can be improved.
- Example 3 has the same structure as the organic EL device of Example 1 except that the light emitting layer does not contain a host material and is composed of only a single layer of Ir (Ph q) 3 having a thickness of 20 OA.
- An organic EL device having the same was used.
- the organic EL device of Example 3 was manufactured by the same method as the method of manufacturing the organic EL device of Example 1.
- the organic EL device of this example since a hole blocking layer having a high ionization potential is formed between the light emitting layer and the electron transporting layer, the energy barrier between the light emitting layer and the hole blocking layer is formed. Becomes larger. For this reason, it is possible to prevent holes from being injected from the light emitting layer into the electron transport layer. This makes it possible to efficiently recombine holes and electrons in the light emitting layer. As a result, the luminous efficiency of the organic EL device can be improved.
- the luminescence characteristics were measured in the same manner as in Example 1. As a result, in this organic EL device, good orange light having a peak at a wavelength of 598 nm was obtained.
- Example 2 when the light emitting layer contains BCP or BA 1 Q as a host, the light emitting layer contains only Ir (P h Q) 3 . , The luminance and luminous efficiency are further improved.
- Examples 4 to 13 the organic E of Example 1 was used except for the dopant of the light emitting layer.
- An organic EL device having the same structure as the L device was used.
- the organic EL devices of Examples 4 to 13 were manufactured by the same method as the method for manufacturing the organic EL device of Example 1, and the organic EL devices of Examples 4 to 13 were used as dopants in the light emitting layers of the organic EL devices, respectively.
- Compounds 1 to 10 having the molecular structures represented by the following formulas (C1) to (C10) were used.
- FIG. 2 representatively shows an emission spectrum of the organic EL device of Example 11. As shown in FIG. 2, in the organic EL device of Example 11, a light emitting spectrum having a peak at a wavelength of 630 nm was obtained.
- Table 1 shows the measurement results of the materials and the emission characteristics of the organic EL devices of Examples 4 to 13. ⁇ table 1 ⁇
- Examples 14 to 16 an organic EL device having the same structure as the organic EL device of Example 1 was used except that Compound 3 was used as a dopant for the light emitting layer.
- the concentrations of the compound 3 as a dopant were 13%, 20% and 3%, respectively.
- the organic EL devices of Examples 14 to 16 were manufactured by the same method as the method of manufacturing the organic EL device of Example 1.
- Example 1 shows the measurement results of the materials and the emission characteristics of the organic EL devices of Examples 14 to 16.
- Example 14 when the concentration of compound 3, which is a dopant, is 13%, the maximum luminance is 43,000 cd / m 2 , and the luminous efficiency at this time is 18.2 cd / A. became.
- Example 6 when the concentration of the compound 3 as the dopant was 6.5%, the maximum luminance was 29,500 cd / m 2 and the luminous efficiency at this time was 14.2 cd / A. .
- Example 16 when the concentration of the compound 3 as a dopant was 3%, the maximum luminance was 20, 100 cd / m 2 , and the luminous efficiency at this time was 10.2 cd / A.
- Example 15 when the concentration of the compound 3, which is a dopant, was 20%, the maximum luminance was 17,000 cd / m 2 , and the luminous efficiency at this time was 8 cd / A. From the results of Examples 6, 14 to 16, it was found that good luminous efficiency can be realized when the concentration of compound 3 is in the range of 3% to 20%.
- Example 17 an organic iridium compound was used as a host material of the light emitting layer.
- the light emitting layer contained Ir (Phq) 3 as a host material and the light emitting layer contained 6.5% by weight of the compound 8 represented by the above formula (C 8) as a light emitting dopant.
- an organic EL device having a structure similar to that of the organic EL device of Example 1 was used.
- the organic EL device of Example 17 was manufactured by the same method as the method of manufacturing the organic EL device of Example 1.
- the luminescence characteristics were measured in the same manner as in Example 1.
- red light emission having a peak at a wavelength of 621 nm was obtained.
- the maximum luminance was 9800 cd / m 2
- the luminous efficiency at this time was 4.lcdZA.
- the triplet was used as the host material of the light emitting layer. It was found that the use of the excitation material Ir (Ph q) 3 makes it possible to achieve high-luminance red to orange emission with good luminous efficiency in an organic EL device.
- Example 18 an organic iridium compound was used as a hole transport material.
- a hole injection electrode made of ITO a hole transport layer of 30 nm made of Ir (Phq) 3, a light emitting layer of 50 nm made of A1q, and a An organic EL device was used in which electron injection electrodes made of Mg and an Mg In alloy were sequentially stacked.
- the luminescence characteristics were measured in the same manner as in Example 1.
- green light emission having a peak at a wavelength of 530 nm was obtained.
- the maximum luminance was 3100 cd / m 2
- the luminous efficiency at this time was 1.5 ⁇ ⁇ 1 / ⁇ ⁇
- the use of the triplet excitation material Ir (Ph q) 3 makes it possible to achieve high-luminance green light emission with good luminous efficiency in an organic EL device.
- Example 19 an organic iridium compound was used as an electron transport material.
- a hole injection electrode made of ITO, a 50 nm light emitting layer, a 30 nm electron transport layer made of Ir (PhQ) 3, and an electron injection made of MgIn alloy were formed on a glass substrate.
- An organic EL element in which electrodes were sequentially stacked was used.
- the light emitting layer contains NPB as a host material and 5% by weight of rubrene having a molecular structure represented by the following formula (16) as a light emitting dopant.
- the luminescence characteristics were measured in the same manner as in Example 1.
- yellow light emission having a peak at a wavelength of 560 nm was obtained.
- the yellow light obtained here is the CIE chromaticity
- the maximum luminance in this case was 2800 cd / m 2
- the luminous efficiency at this time was 1.3 cd / A.
- triplet excitation as an electron transport material was performed. It was found that the use of Ir (Ph q) 3 as a material makes it possible to achieve high-brightness yellow light emission with good luminous efficiency in an organic EL device.
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Description
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US10/467,856 US7998595B2 (en) | 2001-02-14 | 2002-02-12 | Organic electroluminescent device, luminescent material and organic compound |
EP02711477A EP1371708A4 (en) | 2001-02-14 | 2002-02-12 | ORGANIC ELECTROLUMINESCENCE DEVICE, LUMINESCENT MATERIAL, AND ORGANIC COMPOUND |
JP2002565020A JP3942544B2 (ja) | 2001-02-14 | 2002-02-12 | 有機エレクトロルミネッセンス素子、発光材料および有機化合物 |
KR1020027013716A KR100874290B1 (ko) | 2001-02-14 | 2002-02-12 | 유기 전계 발광 소자, 발광 재료 및 유기 화합물 |
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Also Published As
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JPWO2002064700A1 (ja) | 2004-07-22 |
KR100874290B1 (ko) | 2008-12-18 |
KR20020086950A (ko) | 2002-11-20 |
EP1371708A1 (en) | 2003-12-17 |
JP3942544B2 (ja) | 2007-07-11 |
EP1371708A4 (en) | 2004-06-16 |
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