WO2022034421A1 - 発光デバイス、発光装置、電子機器および照明装置 - Google Patents
発光デバイス、発光装置、電子機器および照明装置 Download PDFInfo
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- WO2022034421A1 WO2022034421A1 PCT/IB2021/056887 IB2021056887W WO2022034421A1 WO 2022034421 A1 WO2022034421 A1 WO 2022034421A1 IB 2021056887 W IB2021056887 W IB 2021056887W WO 2022034421 A1 WO2022034421 A1 WO 2022034421A1
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- Prior art keywords
- light emitting
- layer
- emitting device
- electron
- light
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical group C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
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- SEEPANYCNGTZFQ-UHFFFAOYSA-N sulfadiazine Chemical compound C1=CC(N)=CC=C1S(=O)(=O)NC1=NC=CC=N1 SEEPANYCNGTZFQ-UHFFFAOYSA-N 0.000 description 1
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- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- 125000005579 tetracene group Chemical group 0.000 description 1
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- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 125000004665 trialkylsilyl group Chemical group 0.000 description 1
- DTQVDTLACAAQTR-UHFFFAOYSA-N trifluoroacetic acid Substances OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 125000005580 triphenylene group Chemical group 0.000 description 1
- 229910000404 tripotassium phosphate Inorganic materials 0.000 description 1
- 235000019798 tripotassium phosphate Nutrition 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 125000001834 xanthenyl group Chemical group C1=CC=CC=2OC3=CC=CC=C3C(C12)* 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- OYQCBJZGELKKPM-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O-2].[Zn+2].[O-2].[In+3] OYQCBJZGELKKPM-UHFFFAOYSA-N 0.000 description 1
- CJGUQZGGEUNPFQ-UHFFFAOYSA-L zinc;2-(1,3-benzothiazol-2-yl)phenolate Chemical compound [Zn+2].[O-]C1=CC=CC=C1C1=NC2=CC=CC=C2S1.[O-]C1=CC=CC=C1C1=NC2=CC=CC=C2S1 CJGUQZGGEUNPFQ-UHFFFAOYSA-L 0.000 description 1
- ZVWKZXLXHLZXLS-UHFFFAOYSA-N zirconium nitride Chemical compound [Zr]#N ZVWKZXLXHLZXLS-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
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- 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
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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
- H10K50/15—Hole transporting layers
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/14—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hydrogen or carbon atoms directly attached to at least one ring carbon atom
- C07D251/24—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hydrogen or carbon atoms directly attached to at least one ring carbon atom to three ring carbon atoms
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- 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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- 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
- G09F9/33—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 being semiconductor devices, e.g. diodes
- G09F9/335—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 being semiconductor devices, e.g. diodes being organic light emitting diodes [OLED]
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- 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
- H10K50/80—Constructional details
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- H10K50/81—Anodes
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
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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
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
- H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
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- 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
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/654—Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
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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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- 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
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/805—Electrodes
- H10K59/8052—Cathodes
- H10K59/80524—Transparent cathodes, e.g. comprising thin metal layers
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
Definitions
- One aspect of the present invention relates to an organic compound, a light emitting element, a light emitting device, a display module, a lighting module, a display device, a light emitting device, an electronic device, a lighting device, and an electronic device. It should be noted that one aspect of the present invention is not limited to the above technical fields.
- the technical field of one aspect of the invention disclosed in the present specification and the like relates to a product, a method, or a manufacturing method.
- one aspect of the invention relates to a process, machine, manufacture, or composition (composition of matter).
- the technical fields of one aspect of the present invention disclosed in the present specification include semiconductor devices, display devices, liquid crystal display devices, light emitting devices, lighting devices, power storage devices, storage devices, image pickup devices, and the like.
- the driving method or the manufacturing method thereof can be given as an example.
- organic EL devices that utilize electroluminescence (EL) using organic compounds
- EL layer organic compound layer
- EL layer organic compound layer
- Such a light emitting device is a self-luminous type, when used as a pixel of a display, it has advantages such as higher visibility and no need for a backlight as compared with a liquid crystal display, and is particularly suitable for a flat panel display. Further, it is a great advantage that the display using such a light emitting device can be manufactured thin and lightweight. Another feature is that the response speed is very fast.
- these light emitting devices can form a light emitting layer continuously in two dimensions, light emission can be obtained in a planar manner. This is a feature that is difficult to obtain with a point light source represented by an incandescent lamp and an LED, or a line light source represented by a fluorescent lamp, and therefore has high utility value as a surface light source that can be applied to lighting and the like.
- displays and lighting devices using light emitting devices are suitable for various electronic devices, but research and development are underway in search of light emitting devices having better characteristics.
- One of the problems in one aspect of the present invention is to provide a light emitting device having high luminous efficiency.
- one aspect of the present invention is to provide any of a light emitting device, a light emitting device, an electronic device, a display device, or an electronic device having low power consumption.
- one of the problems in one aspect of the present invention is to provide an inexpensive light emitting device.
- one of the problems in one aspect of the present invention is to provide a light emitting device that is inexpensive and has high luminous efficiency.
- the present invention shall solve any one of the above-mentioned problems.
- One aspect of the present invention has an anode, a cathode, and an EL layer located between the anode and the cathode, and the EL layer has a hole transport region, a light emitting layer, and an electron transport region.
- the hole transport region is located between the anode and the light emitting layer
- the electron transport region is located between the cathode and the light emitting layer
- the hole transport region is coated and fired with a varnish containing heteropolyacid.
- the electron-transporting region has an electron-transporting organic compound, and the normal light refractive index of the electron-transporting organic compound in light having a wavelength of 455 nm or more and 465 nm or less is 1. It is a light emitting device having 50 or more and 1.75 or less.
- another aspect of the present invention has an anode, a cathode, and an EL layer located between the anode and the cathode, and the EL layer includes a hole transport region, a light emitting layer, and an electron transport region.
- the hole transport region is located between the anode and the light emitting layer
- the electron transport region is located between the cathode and the light emitting layer
- the hole transport region is a varnish containing heteropolyacid. It has a layer formed by coating and firing
- the electron transport region has an electron transporting organic compound, and the normal light refractive index of the electron transporting organic compound with respect to light having a wavelength of 633 nm is 1. It is a light emitting device having a temperature of .45 or more and 1.70 or less.
- the hole transport region is coated and fired with a varnish containing an organic compound having a heteropolyacid and a ⁇ -electron-rich aromatic ring, or an organic compound having a heteropolyacid and a ⁇ -electron-rich heteroaromatic ring. It is preferable to have a formed layer.
- the organic compound having a ⁇ -electron-rich aromatic ring and the organic compound having a ⁇ -electron-rich heteroaromatic ring are preferably arylamines.
- another aspect of the present invention has an anode, a cathode, and an EL layer located between the anode and the cathode, and the EL layer has a hole transport region, a light emitting layer, and an electron transport region.
- the hole transport region is located between the anode and the light emitting layer
- the electron transport region is located between the cathode and the light emitting layer
- the hole transport region has heteropolyacid and electron transport.
- the region has an organic compound having an electron transporting property
- the organic compound having an electron transporting property is a light emitting device having an anode refractive index of 1.50 or more and 1.75 or less in light having a wavelength of 455 nm or more and 465 nm or less. ..
- another aspect of the present invention has an anode, a cathode, and an EL layer located between the anode and the cathode, and the EL layer has a hole transport region, a light emitting layer, and an electron transport region.
- the hole transport region is located between the anode and the light emitting layer
- the electron transport region is located between the cathode and the light emitting layer
- the hole transport region has heteropolyacid and electron transport.
- the region is a light emitting device having an electron transporting organic compound and having an electron transporting organic compound having an anode refractive index of 1.45 or more and 1.70 or less with respect to light having a wavelength of 633 nm.
- the hole transport region contains an organic compound having a heteropolyacid and a ⁇ -electron-rich aromatic ring, or an organic compound having a heteropolyacid and a ⁇ -electron-rich heteroaromatic ring.
- the organic compound having a ⁇ -electron-rich aromatic ring and the organic compound having a ⁇ -electron-rich heteroaromatic ring are preferably arylamines.
- the hole transport region contains a heteropolyacid and a tertiary amine.
- the heteropolyacid is preferably phosphotungstic acid.
- the hole transport region contains aryl sulfonic acid.
- the light emitting layer contains an iridium complex.
- the iridium complex exhibits green phosphorescence.
- the iridium complex is an iridium complex represented by the following structural formula (301).
- the electron-transporting organic compound has at least one 6-membered heteroaromatic ring containing nitrogen, two benzene rings, and one or more aromatic hydrocarbons having 6 to 14 carbon atoms.
- An organic compound having a hydrogen ring and a hydrocarbon group forming a bond in a plurality of sp 3 hybrid orbitals and having a total number of carbons forming a bond in the sp 3 hybrid orbital is an organic compound having electron transportability. It is preferably 10% or more and 60% or less of the total number of carbon atoms in the molecule.
- the electron transport region has an electron transport layer and an electron injection layer, the electron injection layer is provided in contact with the cathode, and the electron transport layer contains an organic compound having electron transport property. Is preferable.
- the electron transport layer contains a metal complex of an alkali metal or an alkaline earth metal.
- the metal complex of an alkali metal or an alkaline earth metal has a ligand containing an 8-quinolinolat structure.
- the metal complex of alkali metal or alkaline earth metal is a metal complex of lithium.
- the electron injection layer contains a heteroaromatic compound.
- the heteroaromatic compound is preferably 2-phenyl-9- [3- (9-phenyl-1,10-phenanthroline-2-yl) phenyl] -1,10-phenanthroline.
- the electron injection layer contains fluorine and sodium.
- the electron injection layer contains barium.
- another aspect of the present invention includes a plurality of light emitting devices according to any one of the above, wherein the plurality of light emitting devices include a light emitting device that emits light at least in red and a light emitting device that emits light in green.
- the light emitting layer of the light emitting device that emits red light, and the light emitting layer of the light emitting device that emits green light are light emitting devices containing iridium.
- the light obtained from each of the light emitting device that emits red light and the light emitting device that emits green light is phosphorescent light.
- the plurality of light emitting devices include a light emitting device that emits blue light, and the light obtained from the light emitting device that emits blue light is fluorescent.
- another aspect of the present invention is a light emitting device having a plurality of light emitting devices according to any one of the above.
- another aspect of the present invention is a display device provided with the light emitting device according to any one of the above.
- another aspect of the present invention is an electronic device having the light emitting device according to any one of the above, a sensor, an operation button, a speaker or a microphone.
- another aspect of the present invention is a lighting device having the light emitting device according to any one of the above and a housing.
- the light emitting device in the present specification includes an image display device using a light emitting device. Further, a module in which a connector, for example, an anisotropic conductive film or TCP (Tape Carrier Package) is attached to the light emitting device, a module in which a printed wiring board is provided at the end of TCP, or a COG (Chip On Glass) method in the light emitting device. A module in which an IC (integrated circuit) is directly mounted may also be included in the light emitting device. Further, lighting equipment and the like may have a light emitting device.
- a connector for example, an anisotropic conductive film or TCP (Tape Carrier Package) is attached to the light emitting device
- a module in which a printed wiring board is provided at the end of TCP or a COG (Chip On Glass) method in the light emitting device.
- COG Chip On Glass
- a module in which an IC (integrated circuit) is directly mounted may also be included in the light emitting device. Further
- a light emitting device having high luminous efficiency it is possible to provide a light emitting device having high luminous efficiency.
- any of a light emitting device, a light emitting device, an electronic device, a display device, or an electronic device having low power consumption can be provided.
- a novel organometallic complex can be provided.
- metal complex applicable to a light emitting device having a low drive voltage.
- metal complex having an electron transport layer having a low refractive index and applicable to a light emitting device having a low driving voltage it is possible to provide a metal complex having an electron transport layer having a low refractive index and applicable to a light emitting device having a low driving voltage.
- 1A to 1D are schematic views of a light emitting device.
- 2A and 2B are diagrams showing an active matrix type light emitting device.
- 3A and 3B are diagrams showing an active matrix type light emitting device.
- FIG. 4 is a diagram showing an active matrix type light emitting device.
- 5A and 5B are diagrams showing a passive matrix type light emitting device.
- 6A and 6B are diagrams showing a lighting device.
- 7A, 7B1, 7B2 and 7C are diagrams representing electronic devices.
- 8A to 8C are diagrams showing electronic devices.
- FIG. 9 is a diagram showing a lighting device.
- FIG. 10 is a diagram showing a lighting device.
- FIG. 11 is a diagram showing an in-vehicle display device and a lighting device.
- FIG. 12A and 12B are diagrams showing electronic devices.
- 13A to 13C are diagrams showing electronic devices.
- FIG. 14 is an absorption spectrum and an emission spectrum in a dehydrated acetone solution of Li-6mq.
- FIG. 15 is data obtained by measuring the refractive index of mmtBumBPTzhn.
- 16A to 16D are diagrams showing an example of a method for manufacturing a light emitting device.
- FIG. 17 is a conceptual diagram illustrating a droplet ejection device.
- FIG. 18 is a diagram illustrating the ESR spectra of the sample 1, the comparative sample 1, and the comparative sample 2.
- FIG. 19 is a diagram illustrating an ultraviolet-visible absorption spectrum of sample 1.
- FIG. 20 is a diagram illustrating an ultraviolet-visible absorption spectrum of Comparative Sample 1.
- FIG. 21 is a diagram illustrating an ultraviolet-visible absorption spectrum of Comparative Sample 2.
- FIG. 1A shows a diagram showing a light emitting device according to an aspect of the present invention.
- the light emitting device of one aspect of the present invention has an anode 101, a cathode 102, and an EL layer 103, and the EL layer 103 includes a hole transport region 120, a light emitting layer 113, an electron transport region 121, and the like. have.
- the hole transporting region 120 has a hole injecting layer 111 and a hole transporting layer 112, and the electron transporting region 121 has an electron transporting layer 114 and an electron injecting layer 115, respectively. May not be provided, or other functional layers may be provided. Examples of other functional layers include a carrier block layer, an exciton block layer, a charge generation layer, and the like.
- the light emitting layer 113 has at least a light emitting material
- the electron transport region 121 has at least an organic compound having electron transportability.
- the hole transport region 120 is assumed to include at least a part of a layer formed by a wet film forming method.
- the hole transport region 120 has a layer in which the ink containing the material is formed by a wet film forming method such as an inkjet method.
- the hole transport region 120 is formed by laminating a single layer or a plurality of layers from layers having desired functions such as a hole injection layer 111, a hole transport layer 112, and an electron block layer. It should be noted that not only the configuration in which one layer has one function but also the configuration in which a layer having a plurality of functions such as a hole injection transport layer is provided may be provided.
- the hole transport region 120 has a function of transporting holes between the anode 101 and the light emitting layer 113, so that the hole transport region 120 contains a material having a hole transport property. It is more preferable that a material having a hole transporting property and a material exhibiting an accepting property are contained.
- a material having a hole transport property for example, an organic compound having a ⁇ -electron-rich aromatic ring or an organic compound having a ⁇ -electron-rich heteroaromatic ring is preferable.
- the ⁇ -electron excess aromatic ring for example, an arylamine skeleton can be mentioned.
- examples of the ⁇ -electron excess type heteroaromatic ring include a thiophene skeleton, a pyrrole skeleton, and a carbazole skeleton.
- examples of the material having a hole transport property include arylamine having an arylamine skeleton, a thiophene derivative having a thiophene skeleton, a pyrrole derivative having a pyrrole skeleton, and a carbazole derivative having a carbazole skeleton.
- the material having hole transportability may be a small molecule, an oligomer, or a polymer, or a mixture thereof.
- the hole transport region 120 includes two layers, a hole injection layer 111 and a hole transport layer 112.
- the material exhibiting the acceptability includes, for example, a heteropolyacid (both heteropolyoxometalate and metal oxoacid). ) And so on.
- Heteropolyacids are preferable because they can be easily formed into a film by a wet method. It also shows strong acidity even in the solid state, which is preferable.
- the heteropolyacid is an inorganic oxygen acid formed by condensation or polymerization of two or more kinds of inorganic oxygen acids.
- the heteropolyacid is represented by, for example, [X w M x O y ] n ⁇ , where X is a hetero atom, M is a poly atom, O is oxygen, w, x, y, and n are each represented by any integer. ..
- Examples of the heteroatom of the heteropolyacid include phosphorus (P), silicon (Si), arsenic (As), germanium (Ge), and boron (B).
- Examples of the skeleton atom (also referred to as a poly atom) of the heteropolyacid include tungsten (W), molybdenum (Mo), vanadium (V), niobium (Nb), and tantalum (Ta).
- the skeleton atom has one or more of the above-mentioned elements.
- heteropolyacid examples include phosphotung acid, phosphomolybdic acid, phosphomolybdotungstate, phosphomolybdovanadic acid, silicate-tungstate, silicate-molybdenum, germanium-tungnic acid, germanium-molybdic, and their compounds. Can be mentioned.
- phosphotungstic acid or phosphomolybdic acid is preferable.
- the heteropolyacid used for the hole transport region 120 may be used alone or in combination of two or more.
- heteropolyacids containing molybdenum, tungsten, or vanadium have strong oxidizing power in addition to strong acidity, and when mixed with an organic compound having a ⁇ -electron-rich aromatic ring or an organic compound having a ⁇ -electron-rich heteroaromatic ring, carriers are generated. It is easy to generate, the conductivity is improved, and it is preferable. Of these, phosphotungstic acid or phosphomolybdic acid is preferable because it is inexpensive and easy to handle, and further, phosphotungstic acid is less likely to be colored.
- Examples of the primary structure of the heteropolyacid include Keggin type and Dawson type.
- the structure of Keggin-type phosphotungstic acid (H 3 PW 12 O 40 ) is shown below.
- the skeletal structure of the polyanion ([PW 12 O 40 ] 3- ) is shown, and the counter cation (which may contain water of crystallization and organic molecules) is omitted.
- a polymer material having a desired function, a small molecule material, or a material such as a dendrimer may be used as it is, or an ink dispersed or dissolved in a solvent may be used.
- an ink in which one or more kinds of monomers of the polymer material to be obtained are mixed may be applied, and after application by heating, energy light irradiation or the like, bonds such as cross-linking or condensation, polymerization, coordination and salt may be formed.
- the ink may contain an organic compound having other functions such as a surfactant and a substance for adjusting viscosity.
- Secondary arylamines are preferred because they form crosslinks and improve film quality when mixed with heteropolyacids. Further, it is preferable because it is easy to generate carriers and the conductivity is improved.
- the arylamine used as the monomer any of primary amine, secondary amine, and tertiary amine can be used, but tertiary amine is more preferable. Since the tertiary amine is more electrochemically and photoscientifically more stable than the secondary amine, the hole transport property becomes better when the tertiary amine and the heteropolyacid are mixed.
- the arylamine used as a monomer is not limited to only one kind, and a plurality of arylamines can be used in combination. For example, it is possible to use both tertiary and secondary amines, both primary and tertiary amines, or both primary and secondary amines. Further, all of the primary amine, the secondary amine, and the tertiary amine may be used in combination.
- the arylamine has a substituted or unsubstituted aryl group having 6 to 14 carbon atoms and a substituted or unsubstituted ⁇ -electron excess heteroaryl group having 6 to 12 carbon atoms.
- the aryl group include a phenyl group, a biphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthryl group and the like.
- the solubility of the arylamine is good and the raw material price is low, which is preferable.
- the ⁇ -electron excess heteroaryl group include a carbazole skeleton, a pyrrole skeleton, a thiophene skeleton, a furan skeleton, and an imidazole skeleton.
- the arylamine has a plurality of bonds formed via the ⁇ -electron excess heteroarylamine because the film quality is improved. Further, oligomers or polymers having many of these bonds may be formed.
- a part of the amine skeleton may be a tertiary amine, a secondary amine, or a primary amine, and a large proportion of the tertiary amine is preferable, and all of them.
- Tertiary amines are chemically stable and more preferred.
- the number of amine skeletons is 1000 or less, more preferably 10 or less, and the molecular weight is preferably 100,000 or less. Further, when fluorine is substituted, the compatibility with the compound in which fluorine is substituted is improved, which is preferable.
- arylamines for example, an organic compound represented by the following general formula (Gam1) is preferable.
- Ar 1 to Ar 3 represent substituted or unsubstituted aryl groups having 6 to 14 carbon atoms, which may be bonded to each other to form a ring.
- the substituent may be a group in which a plurality of diarylamino groups or carbazolyl groups are linked. Further, it may have an ether bond, a sulfide bond, or a bond via an amine, and when it has a plurality of aryl groups, it is preferable to use these bonds because the solubility in an organic solvent is improved. Further, when it has an alkyl group as a substituent, it may be bonded via an ether bond, a sulfide bond, or an amine.
- tertiary amine represented by the general formula (Gam1) include organic compounds represented by the following structural formulas (Am1-1) to (Am1-8).
- another material having a hole transporting property may be appropriately mixed with these tertiary amines.
- a secondary amine may be used as the amine used as the above-mentioned monomer.
- an organic compound represented by the following general formula (Gam2) is preferable.
- Ar 11 to Ar 13 represents hydrogen, and the others represent substituted or unsubstituted aromatic rings having 6 to 14 carbon atoms, and Ar 14 to Ar 17 are substituted. Alternatively, it represents an unsubstituted aromatic ring having 6 to 14 carbon atoms.
- Ar 12 and Ar 16 , Ar 14 and Ar 16 , Ar 11 and Ar 14 , Ar 14 and Ar 15 , Ar 15 and Ar 17 , and Ar 13 and Ar 17 may be coupled to each other to form a ring. ..
- p represents an integer of 0 to 1000, and is preferably 0 to 3.
- the molecular weight of the organic compound represented by the general formula (Gam2) is preferably 100,000 or less.
- aromatic ring having 6 to 14 carbon atoms a benzene ring, a bisbenzene ring, a naphthalene ring, a fluorene ring, a phenanthrene ring, an anthracene ring and the like can be used.
- the secondary amine (having an NH group) represented by the general formula (Gam2) include organic compounds represented by the following structural formulas (Am2-1) to structural formulas (Am2-32). Can be mentioned.
- the compound mixed in addition to the heteropolyacid is fluoride, as in the following structural formulas (Am2-22) to (Am2-28) and structural formula (Am2-31). It is preferable to use fluoride because the compatibility is improved when fluoride is contained in the varnish.
- the varnish described in this specification and the like can be paraphrased as ink.
- the ink described in the present specification and the like can be paraphrased as varnish.
- a thiophene derivative may be used instead of arylamine.
- Specific examples of the thiophene derivative include organic compounds represented by the following structural formulas (T-1) to (T-4), as well as polythiophene and poly (3,4-ethylenedioxythiophene). (PEDOT) and the like are preferable.
- a material exhibiting acceptability other than heteropolyacid is simultaneously contained.
- the material exhibiting the acceptability include a sulfonic acid compound, a fluorine compound, a trifluoroacetic acid compound, a propionic acid compound, and a metal oxide.
- the sulfonic acid compound an aryl sulfonic acid compound is preferable.
- the aryl sulfonic acid may have a sulfo group, and sulfonic acid or sulfonic acid salt, alkoxy sulfonic acid, halogenated sulfonic acid, and sulfonic acid anion can be used.
- sulfo group a group as described above can be used. It may have a plurality of these sulfo groups.
- aryl group of the aryl sulfonic acid a substituted or unsubstituted aryl group having 6 to 16 carbon atoms can be used.
- aryl group for example, a phenyl group, a biphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthryl group, a pyrenyl group and the like can be used, and the naphthyl group is preferable because it has good solubility and transportability in an organic solvent.
- these aryl sulfonic acids may have a plurality of aryl groups, and the presence of a fluorine-substituted aryl group is preferable because the LUMO level can be deeply adjusted (largely negatively).
- it may have an ether bond, a sulfide bond, or a bond via an amine, and when it has a plurality of aryl groups, it is preferable to use these bonds because the solubility in an organic solvent is improved.
- it when it has an alkyl group as a substituent, it may be bonded via an ether bond, a sulfide bond, or an amine.
- these aryl sulfonic acids may be substituted with a plurality of polymers.
- polyethylene, nylon, polystyrene, polyfluorenylene and the like can be used, but polystyrene or polyfluorenylene has good conductivity and is preferable.
- aryl sulfonic acid compound for example, an organic compound represented by the following structural formula (S-1) to structural formula (S-15) is preferable.
- Polymers with sulfo groups such as poly (4-styrene sulfonic acid) (PSS) can also be used.
- PSS poly (4-styrene sulfonic acid)
- an aryl sulfonic acid compound electrons from an electron donor with a shallow HOMO level (amine compound, carbazole compound, thiophene compound, etc.) can be received, and by mixing with the electron donor, the positive from the electrode can be received. It can have hole injection and hole transport properties.
- the LUMO level can be adjusted deeper (having a more negative energy level).
- a cyano compound such as a tetracyanoquinodimethane compound can also be used as an electron acceptor.
- a cyano compound such as a tetracyanoquinodimethane compound
- F4TCNQ 2,3,5,6-tetrafluoro-7,7,8,8-tetracyano-quinodimethane
- HAT-CN6 3,6,7,10,11-hexacarbonitrile
- the ink mixed with the above monomers contains either or both of the 3,3,3-trifluoropropyltrimethoxysilane compound and the phenyltrimethoxysilane compound, it gets wet when formed in a wet film. It is preferable because it improves the properties.
- FIG. 16A to 16D are cross-sectional views illustrating a method for producing a layer 786 containing a light emitting substance.
- the conductive film 772 is formed on the flattening insulating film 770, and the insulating film 730 is formed so as to cover a part of the conductive film 772 (see FIG. 16A).
- the droplet 784 is ejected from the droplet ejection device 783 to the exposed portion of the conductive film 772 which is the opening of the insulating film 730 to form the layer 785 containing the composition.
- the droplet 784 is a composition containing a solvent and adheres to the conductive film 772 (see FIG. 16B).
- the step of ejecting the droplet 784 may be performed under reduced pressure.
- the solvent is removed from the layer 785 containing the composition and solidified to form the layer 786 containing the luminescent substance (see FIG. 16C).
- a drying step or a heating step may be performed.
- the conductive film 788 is formed on the layer 786 containing the light emitting substance to form the light emitting element 782 (see FIG. 16D).
- the composition can be selectively ejected, so that the loss of the material can be reduced. Further, since the lithography process for processing the shape is not required, the process can be simplified and the cost can be reduced.
- the droplet ejection method described above is a general term for a nozzle having a discharge port for a composition or a head having one or a plurality of nozzles having a means for ejecting droplets.
- FIG. 17 is a conceptual diagram illustrating the droplet ejection device 1400.
- the droplet ejection device 1400 has a droplet ejection means 1403. Further, the droplet ejection means 1403 has a head 1405, a head 1412, and a head 1416.
- the head 1405, the head 1412, and the head 1416 are connected to the control means 1407, and can be drawn in a pre-programmed pattern by controlling the head 1405 with the computer 1410.
- the marker 1411 formed on the substrate 1402 may be used as a reference.
- the reference point may be determined with reference to the outer edge of the substrate 1402.
- the marker 1411 is detected by the image pickup means 1404, converted into a digital signal by the image processing means 1409, recognized by the computer 1410, and a control signal is generated and sent to the control means 1407.
- an image sensor using a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) can be used as the image pickup means 1404.
- Information on the pattern to be formed on the substrate 1402 is stored in the storage medium 1408, and a control signal is sent to the control means 1407 based on this information, and the head 1405 and the head of the droplet ejection means 1403 are sent.
- the 1412 and the head 1416 can be controlled individually.
- the material to be discharged is supplied from the material supply source 1413, the material supply source 1414, and the material supply source 1415 to the head 1405, the head 1412, and the head 1416, respectively, through piping.
- the inside of the head 1405, the head 1412, and the head 1416 has a structure having a space for filling a liquid material and a nozzle which is a discharge port.
- the head 1412 also has an internal structure similar to that of the head 1405. If the nozzles of the head 1405 and the head 1412 are provided in different sizes, different materials can be drawn at different widths at the same time. With one head, it is possible to eject and draw multiple types of light emitting materials, etc., and when drawing in a wide area, it is possible to simultaneously eject and draw the same material from multiple nozzles in order to improve throughput. can.
- the head 1405, the head 1412, and the head 1416 can freely scan the substrate in the directions of the arrows X, Y, and Z shown in FIG. 17, and the drawing area can be freely set. , The same pattern can be drawn multiple times on one board.
- the layer 786 containing the luminescent substance can be produced by using the droplet ejection device.
- various organic solvents and various organic solvents are formed as a composition in which various organic materials and organic inorganic halogen perovskites are dissolved or dispersed in a solvent by a wet method.
- various organic solvents that can be used in the composition include benzene, toluene, xylene, mesitylene, tetrahydrofuran, dioxane, ethanol, methanol, n-propanol, isopropanol, n-butanol, t-butanol, acetonitrile, dimethyl sulfoxide, and the like.
- Examples thereof include dimethylformamide, chloroform, methylene chloride, carbon tetrachloride, ethyl acetate, hexane, cyclohexane and the like.
- a low-polarity benzene derivative such as benzene, toluene, xylene, and mesitylene
- a solution with a suitable concentration can be prepared, and the material contained in the droplets can be prevented from deteriorating due to oxidation or the like. It is preferable because it can be done.
- the boiling point is preferably 100 ° C. or higher, and toluene, xylene, and mesitylene are more preferable.
- the organic compound having electron transporting property contained in the electron transporting region 121 in the light emitting device of one aspect of the present invention has an ordinary light refractive index with respect to light of any wavelength ( ⁇ B ) in the wavelength range of 455 nm or more and 465 nm or less.
- ⁇ B any wavelength in the wavelength range of 455 nm or more and 465 nm or less.
- the normal light refractive index for light having a wavelength of 1.50 or more and 1.75 or less or a wavelength of 633 nm is 1.45 or more and 1.70 or less.
- the refractive index in the present specification is determined by measuring the thin film of the material, but in such a thin film, when the material has anisotropy.
- the index of refraction for normal light and the index of refraction for anisotropy may be different.
- the normal light refractive index is used as an index.
- the electron transport region 121 contains such a material, it is possible to provide a layer having a low refractive index. By providing a layer having a small refractive index inside the EL layer, the light extraction efficiency is improved, and a light emitting device having high luminous efficiency can be obtained.
- the refractive index of the organic compound constituting the light emitting device is about 1.8 to 1.9, and the light emitting device of one aspect of the present invention is provided with an electron transport region 121 having a layer having a small refractive index. This makes it possible to obtain a light emitting device having good light emitting efficiency.
- the electron transport region 121 has an ordinary light refractive index of 1.50 or more and less than 1.75, preferably 1.50 or more and less than 1.70. It is preferable to include a layer. Further, the organic compound having electron transporting property contained in the electron transporting region preferably has an ordinary light refractive index of ⁇ B with respect to light of 1.50 or more and 1.75 or less, and preferably 1.50 or more and 1.70 or less. Is more preferable.
- the normal light refractive index of the organic compound having electron transportability used in the electron transport layer 114 of one aspect of the present invention with respect to light having a wavelength of 633 nm. Is preferably 1.45 or more and 1.70 or less.
- the organic compound having an electron transport property preferably has an alkyl group or a cycloalkyl group.
- the refractive index can be lowered, and the electron transport layer 114 having a low refractive index can be realized.
- the alkyl group of the organic compound having electron transportability is preferably an alkyl group having a branch, particularly preferably an alkyl group having 3 or 4 carbon atoms, and particularly preferably a tert-butyl group. ..
- the electron-transporting organic compound has at least one 6-membered heteroaromatic ring containing 1 or more and 3 or less nitrogen, and forms a ring, which is an aromatic hydrocarbon ring having 6 to 14 carbon atoms. It is preferable that at least two of the plurality of aromatic hydrocarbon rings are benzene rings and contain an organic compound having a plurality of hydrocarbon groups forming bonds in the sp3 mixed orbital. ..
- the total number of carbons forming bonds in the sp3 hybrid orbital is preferably 10% or more and 60% or less of the total carbon number in the molecule of the organic compound, and the organic compound is preferably used. It is more preferable that the total number of carbon atoms in the molecule of the compound is 10% or more and 50% or less. In other words, the ratio of the number of carbon atoms forming a bond in the sp3 hybrid orbital to the total number of carbon atoms in the molecule of the organic compound is preferably 10% or more and 60% or less, preferably 10% or more and 50% or less. Is more preferable.
- the integral value of the signal of less than 4 ppm in the measurement of the organic compound by 1 H-NMR may be 1 ⁇ 2 or more of the integral value of the signal of 4 ppm or more. preferable.
- the hydrocarbon group forming a bond in all sp 3 hybrid orbitals of the organic compound is bonded to an aromatic hydrocarbon ring having 6 to 14 carbon atoms forming the ring, and the aromatic hydrocarbon ring thereof. It is preferable that LUMO of the organic compound is not distributed on the hydrocarbon ring.
- the organic compound having electron transporting property is contained in the electron transporting layer 114 in the electron transporting region 121.
- the organic compound having an electron transport property is preferably an organic compound represented by the following general formula ( Ge11 ).
- A represents a 6-membered heteroaromatic ring containing 1 or more and 3 or less nitrogens, and any of a pyridine ring, a pyrimidine ring, a pyrazine ring, a pyridazine ring, and a triazine ring is preferable.
- the R 200 contains either a hydrogen, an alkyl group having 1 to 6 carbon atoms, an alicyclic group having 3 to 10 carbon atoms, or a substituent represented by the above general formula ( Ge1-1-1 ). show.
- At least one of R 201 to R 215 is a phenyl group having a substituent, and the other is independently hydrogen, an alkyl group having 1 to 6 carbon atoms, an alicyclic group having 3 to 10 carbon atoms, substituted or absent.
- the phenyl group having the substituent has one or two substituents, each of which is independently an alkyl group having 1 to 6 carbon atoms, an alicyclic group having 3 to 10 carbon atoms, a substituent or no substituent. It is any of an aromatic hydrocarbon group having 6 to 14 carbon atoms, which forms a ring of substitution.
- the organic compound represented by the above general formula ( Ge11 ) has a plurality of hydrocarbon groups selected from an alkyl group having 1 to 6 carbon atoms and an alicyclic group having 3 to 10 carbon atoms, and is intramolecular.
- the ratio of the total carbon number forming a bond in the sp3 hybrid orbital to the total carbon number of the above is 10% or more and 60% or less.
- an organic compound represented by the following general formula ( Ge12 ) is preferable.
- R 201 to R 215 is a phenyl group having a substituent, and the other is independently hydrogen, an alkyl group having 1 to 6 carbon atoms, an alicyclic group having 3 to 10 carbon atoms, a substituent or a substituted group.
- R 201 , R 203 , R 205 , R 206 , R 208 , R 210 , R 211 , R 213 and R 215 are hydrogen.
- the phenyl group having the substituent has one or two substituents, each of which is independently an alkyl group having 1 to 6 carbon atoms, an alicyclic group having 3 to 10 carbon atoms, a substituent or no substituent. It is any of an aromatic hydrocarbon group having 6 to 14 carbon atoms, which forms a ring of substitution.
- the organic compound represented by the above general formula ( Ge12 ) has a plurality of hydrocarbon groups selected from an alkyl group having 1 to 6 carbon atoms and an alicyclic group having 3 to 10 carbon atoms, and is intramolecular.
- the ratio of the number of carbon atoms forming a bond in the sp3 hybrid orbital to the total number of carbon atoms in the above is preferably 10% or more and 60% or less.
- the phenyl group having a substituent may be a group represented by the following general formula (G e1 1-2). preferable.
- ⁇ represents a substituted or unsubstituted phenylene group, and is preferably a meta-position substituted phenylene group.
- the substituent is preferably an alkyl group having 1 to 6 carbon atoms or an alicyclic group having 3 to 10 carbon atoms, more preferably an alkyl group having 1 to 6 carbon atoms, and tert-. It is more preferably a butyl group.
- R 20 represents an alkyl group having 1 to 6 carbon atoms, an alicyclic group having 3 to 10 carbon atoms, or an aromatic hydrocarbon group having 6 to 14 carbon atoms forming a substituted or unsubstituted ring.
- m and n represent 1 or 2.
- the plurality of ⁇ may be the same or different.
- the plurality of R 20s may be the same or different.
- R 20 is preferably a phenyl group, and one or both of the two meta positions of R 20 has an alkyl group having 1 to 6 carbon atoms or an alicyclic group having 3 to 10 carbon atoms. It is more preferably a phenyl group.
- the substituent having the phenyl group at one or both of the two meta positions is more preferably an alkyl group having 1 to 6 carbon atoms, and further preferably a tert-butyl group.
- the electron transport layer 114 of the electron transport region 121 may contain a metal complex of an alkali metal or an alkaline earth metal together with an organic compound having an electron transport property.
- a metal complex of alkali metal or alkaline earth metal a metal complex of lithium is preferable.
- the metal complex of an alkali metal or an alkaline earth metal it is preferable to have a ligand containing an 8-quinolinolat structure.
- the metal complex of the alkali metal or alkaline earth metal for example, 8-quinolinolato-lithium and the like are preferable.
- the ligand containing the 8-quinolinolat structure preferably has an alkyl group, and when the lithium complex having the ligand containing the 8-quinolinolat structure has an alkyl group, the alkyl group contained in the complex. Is preferably one.
- the alkyl group contained in the metal complex of the alkali metal preferably has any one of 1 to 3 carbon atoms, and is particularly preferably a methyl group.
- 8-Kinolinolato lithium having an alkyl group can be a metal complex having a small refractive index.
- the normal light refractive index for light having a wavelength in the range of 455 nm or more and 465 nm or less in the thin film state is 1.45 or more and 1.70 or less
- the normal light refractive index for light having a wavelength of 633 nm is 1.40 or more and 1.65 or less. can do.
- 6-alkyl-8-quinolinolato-lithium having an alkyl group at the 6-position has the effect of lowering the drive voltage of the light emitting device.
- 6-alkyl-8-quinolinolato-lithium it is more preferable to use 6-methyl-8-quinolinolato-lithium.
- 6-alkyl-8-quinolinolato-lithium can be expressed as the following general formula ( Giq 1).
- R represents an alkyl group having 1 to 3 carbon atoms.
- a more preferable embodiment is a metal complex represented by the following structural formula (100).
- the organic compound having an electron transporting property used for the electron transporting layer 114 in the light emitting device of one aspect of the present invention preferably has an alkyl group having 3 or 4 carbon atoms, but in particular, the electron transporting property. It is preferable that the organic compound having the above has a plurality of the alkyl groups. However, if the number of alkyl groups in the molecule is too large, the carrier transport property is lowered. Therefore, the proportion of carbon forming a bond in the sp3 hybrid orbital of the organic compound having electron transport property is the total of the organic compound. It is preferably 10% or more and 60% or less, and more preferably 10% or more and 50% or less with respect to the number of carbon atoms. An organic compound having an electron transporting property having such a structure can realize a low refractive index without significantly impairing the electron transporting property.
- an alkyl group or a cycloalkyl group inhibits the interaction (also referred to as docking) between an organic compound having electron transport property and a metal complex of an alkali metal, resulting in an increase in driving voltage.
- a large increase in the driving voltage makes it possible to obtain a light emitting device having a layer having a small refractive index in the electron transport region 121 and having good light emitting efficiency.
- the light emitting device of one aspect of the present invention has an EL layer 103 composed of a plurality of layers between the pair of electrodes of the anode 101 and the cathode 102, and the EL layer 103 has a light emitting material. It has a layer 113 and a hole transport region 120 and an electron transport region 121 having the above-described configuration.
- the anode 101 is preferably formed by using a metal, an alloy, a conductive compound, a mixture thereof, or the like having a large work function (specifically, 4.0 eV or more).
- a metal an alloy, a conductive compound, a mixture thereof, or the like having a large work function (specifically, 4.0 eV or more).
- ITO Indium Tin Oxide
- indium-tin oxide containing silicon or silicon oxide indium-zinc oxide-zinc oxide
- tungsten oxide and indium oxide containing zinc oxide specifically, for example. IWZO
- These conductive metal oxide films are usually formed by a sputtering method, but may be produced by applying a sol-gel method or the like.
- indium oxide-zinc oxide may be formed by a sputtering method using a target in which 1 to 20 wt% zinc oxide is added to indium oxide.
- Indium oxide (IWZO) containing tungsten oxide and zinc oxide is formed by a sputtering method using a target containing 0.5 to 5 wt% of tungsten oxide and 0.1 to 1 wt% of zinc oxide with respect to indium oxide. You can also do it.
- the materials used for the anode 101 include, for example, gold (Au), platinum (Pt), nickel (Ni), tungsten (W), chromium (Cr), molybdenum (Mo), iron (Fe), and cobalt.
- Electrodes of metallic materials (for example, titanium nitride) and the like can be mentioned.
- graphene can also be used as the material used for the anode 101.
- the anode 101 When the anode 101 is made of a material having transparency to visible light, it can be a light emitting device that emits light from the anode side as shown in FIG. 1C. Such a light emitting device can be a so-called bottom emission type light emitting device when the anode 101 is manufactured on the substrate side.
- the EL layer 103 preferably has a laminated structure, but the laminated structure is not particularly limited, and is a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a carrier block layer.
- Various layer structures such as (hole block layer, electron block layer), exciton block layer, and charge generation layer can be applied. It should be noted that any layer may not be provided.
- the hole injecting layer 111 and the hole transporting layer 112 are provided in the hole transporting region 120, and the electron transporting layer 114 and the electron transporting layer 112 are provided in the electron transporting region 121.
- the light emitting layer 113 has a light emitting substance and a host material.
- the light emitting layer 113 may contain other materials at the same time. Further, a plurality of layers having different compositions may be laminated.
- the luminescent substance may be a fluorescent luminescent substance, a phosphorescent luminescent substance, a substance showing thermal activated delayed fluorescence (TADF), or another luminescent substance.
- TADF thermal activated delayed fluorescence
- Examples of the material that can be used as the fluorescent light emitting substance in the light emitting layer 113 include the following. Further, other fluorescent light emitting substances can also be used.
- condensed aromatic diamine compounds typified by pyrenediamine compounds such as 1,6FLPAPrn, 1,6 mMlemFLPARn, and 1,6BnfAPrn-03 are preferable because they have high hole trapping properties and excellent luminous efficiency and reliability. ..
- a phosphorescent light emitting substance is used as a light emitting substance in the light emitting layer 113
- examples of the materials that can be used include the following.
- Tris (4-methyl-6-phenylpyrimidineat) iridium (III) (abbreviation: [Ir (mppm) 3 ]
- Tris (4-tert-butyl 6-phenylpyrimidinat) iridium (III) ( Abbreviation: [Ir (tBuppm) 3 ])
- (Acetylacetone) Bis (6-methyl-4-phenylpyrimidinat) Iridium (III) (Abbreviation: [Ir (mppm) 2 (acac)]
- (Acetylacetonato) Bis [6- (2-norbornyl) ) -4-Phenylpyrimidinat] iridium (III) (abbreviation: [Ir (nbppm)
- the organometallic iridium complex having a pyrimidine skeleton is particularly preferable because it is remarkably excellent in reliability and luminous efficiency.
- the iridium complex represented by the following structural formula (300) or structural formula (301) is particularly preferable to use as the light emitting material. Since the iridium complex has an alkyl group, it is easily dissolved in an organic solvent and the varnish is easily adjusted.
- Triphenylpyrazinato) Iridium (III) (abbreviation: [Ir (tppr) 2 (acac)]), Bis (2,3,5-triphenylpyrazinato) (Dipivaloylmethanato) Iridium (III) (Abbreviation: [Ir (tppr) 2 (dpm)]), (Acetylacetonato) bis [2,3-bis (4-fluorophenyl) quinoxalinato] Iridium (III) (abbreviation: [Ir (Fdpq) 2 (acac) )]) Organic metal iridium complex with pyrazine skeleton, tris (1-phenylisoquinolinato-N, C 2 ') iridium (III) (abbreviation: [Ir (piq) 3 ]), bis (1) -Phenylisoquinolinato-N, C 2' ) Iridium (III) Acetylacetonate (
- known phosphorescent compounds may be selected and used.
- TADF material fullerene and its derivatives, acridine and its derivatives, eosin derivatives and the like can be used.
- metal-containing porphyrin include a protoporphyrin-tin fluoride complex (SnF 2 (Proto IX)), a mesoporphyrin-tin fluoride complex (SnF 2 (Meso IX)) and hematoporphyrin represented by the following structural formulas.
- Heterocyclic compounds having one or both can also be used. Since the heterocyclic compound has a ⁇ -electron excess type heteroaromatic ring and a ⁇ -electron deficiency type heteroaromatic ring, both electron transportability and hole transportability are high, which is preferable.
- the skeletons having a ⁇ -electron deficient complex aromatic ring the pyridine skeleton, the diazine skeleton (pyrimidine skeleton, pyrazine skeleton, pyridazine skeleton), and triazine skeleton are preferable because they are stable and have good reliability.
- the benzoflopyrimidine skeleton, the benzothienopyrimidine skeleton, the benzoflopyrazine skeleton, and the benzothienopyrazine skeleton are preferable because they have high acceptability and good reliability.
- the skeletons having a ⁇ -electron-rich complex aromatic ring the acridine skeleton, the phenoxazine skeleton, the phenothiazine skeleton, the furan skeleton, the thiophene skeleton, and the pyrrole skeleton are stable and have good reliability, and therefore at least one of the skeletons. It is preferable to have.
- the furan skeleton is preferably a dibenzofuran skeleton
- the thiophene skeleton is preferably a dibenzothiophene skeleton.
- the pyrrole skeleton an indole skeleton, a carbazole skeleton, an indolecarbazole skeleton, a bicarbazole skeleton, and a 3- (9-phenyl-9H-carbazole-3-yl) -9H-carbazole skeleton are particularly preferable.
- the substance in which the ⁇ -electron-rich heteroaromatic ring and the ⁇ -electron-deficient heteroaromatic ring are directly bonded has both the electron donating property of the ⁇ -electron-rich heteroaromatic ring and the electron acceptability of the ⁇ -electron-deficient heteroaromatic ring. It becomes stronger and the energy difference between the S1 level and the T1 level becomes smaller, which is particularly preferable because the heat-activated delayed fluorescence can be efficiently obtained.
- an aromatic ring to which an electron-withdrawing group such as a cyano group is bonded may be used.
- an aromatic amine skeleton, a phenazine skeleton, or the like can be used.
- An aromatic ring having a group or a cyano group, a heteroaromatic ring, a carbonyl skeleton such as benzophenone, a phosphine oxide skeleton, a sulfone skeleton and the like can be used.
- a ⁇ -electron-deficient skeleton and a ⁇ -electron-rich skeleton can be used instead of at least one of the ⁇ -electron-deficient complex aromatic ring and the ⁇ -electron-rich heteroaromatic ring.
- the TADF material is a material having a small difference between the S1 level and the T1 level and having a function of converting energy from triplet excitation energy to singlet excitation energy by crossing between inverse terms. Therefore, the triplet excited energy can be up-converted to the singlet excited energy (intersystem crossing) with a small amount of thermal energy, and the singlet excited state can be efficiently generated. In addition, triplet excitation energy can be converted into light emission.
- an excited complex also referred to as an exciplex, an exciplex or an Exciplex
- the difference between the S1 level and the T1 level is extremely small, and the triplet excitation energy is the singlet excitation energy. It has a function as a TADF material that can be converted into.
- a phosphorescence spectrum observed at a low temperature may be used.
- a tangent line is drawn at the hem on the short wavelength side of the fluorescence spectrum
- the energy of the wavelength of the extraline is set to the S1 level
- a tangent line is drawn at the hem on the short wavelength side of the phosphorescence spectrum, and the extrapolation thereof is performed.
- the difference between the S1 level and the T1 level is preferably 0.3 eV or less, and more preferably 0.2 eV or less.
- the S1 level of the host material is higher than the S1 level of the TADF material. Further, it is preferable that the T1 level of the host material is higher than the T1 level of the TADF material.
- various carrier transport materials such as a material having electron transport property, a material having hole transport property, and the above TADF material can be used.
- the material having a hole transport property it is preferable to have a hole mobility of 1 ⁇ 10 -6 cm 2 / Vs or more.
- an organic compound having an amine skeleton or a ⁇ -electron excess type heteroaromatic ring is preferable, and for example, 4,4'-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (abbreviation: NPB), N, N.
- N- (4-biphenyl) -6 N-diphenylbenzo [b] naphtho [1,2-d] furan-8-amine (abbreviation: BnfABP), N, N-bis (4-biphenyl) -6.
- Examples of the material having electron transportability include bis (10-hydroxybenzo [h] quinolinato) berylium (II) (abbreviation: BeBq 2 ) and bis (2-methyl-8-quinolinolato) (4-phenylphenolato).
- Aluminum (III) (abbreviation: BAlq), bis (8-quinolinolato) zinc (II) (abbreviation: Znq), bis [2- (2-benzoxazolyl) phenolato] zinc (II) (abbreviation: ZnPBO), Metal complexes such as bis [2- (2-benzothiazolyl) phenolato] zinc (II) (abbreviation: ZnBTZ) and organic compounds having a ⁇ -electron-deficient heteroaromatic ring are preferable.
- Examples of the organic compound having a ⁇ -electron-deficient heterocyclic ring include 2- (4-biphenylyl) -5- (4-tert-butylphenyl) -1,3,4-oxadiazole (abbreviation: PBD).
- a heterocyclic compound having a diazine skeleton, a heterocyclic compound having a pyridine skeleton, and a heterocyclic compound having a triazine skeleton are preferable because they have good reliability.
- a heterocyclic compound having a diazine (pyrimidine or pyrazine) skeleton and a heterocyclic compound having a triazine skeleton have high electron transport properties and contribute to a reduction in driving voltage.
- the TADF material that can be used as the host material the one listed above as the TADF material can be used in the same manner.
- the triplet excitation energy generated by the TADF material is converted to singlet excitation energy by crossing between inverse terms, and further energy is transferred to the light emitting material, thereby increasing the light emission efficiency of the light emitting device. be able to.
- the TADF material functions as an energy donor and the luminescent material functions as an energy acceptor.
- the S1 level of the TADF material is higher than the S1 level of the fluorescent light emitting substance.
- the T1 level of the TADF material is preferably higher than the S1 level of the fluorescent light emitting substance. Therefore, the T1 level of the TADF material is preferably higher than the T1 level of the fluorescent light emitting substance.
- a TADF material that emits light so as to overlap the wavelength of the absorption band on the lowest energy side of the fluorescent light emitting substance.
- the TADF material in order to efficiently generate singlet excitation energy from triplet excitation energy by reverse intersystem crossing, it is preferable that carrier recombination occurs in the TADF material. Further, it is preferable that the triplet excitation energy generated by the TADF material does not transfer to the triplet excitation energy of the fluorescent light emitting substance.
- the fluorescent light-emitting substance has a protecting group around the chromophore (skeleton that causes light emission) of the fluorescent light-emitting substance.
- a substituent having no ⁇ bond is preferable, a saturated hydrocarbon is preferable, specifically, an alkyl group having 3 or more and 10 or less carbon atoms, and a substituted or unsubstituted cyclo having 3 or more and 10 or less carbon atoms. Examples thereof include an alkyl group and a trialkylsilyl group having 3 or more and 10 or less carbon atoms, and it is more preferable that there are a plurality of protecting groups.
- Substituents that do not have ⁇ bonds have a poor ability to transport carriers, so they can increase the distance between the TADF material and the chromophore of the fluorescent luminescent material with little effect on carrier transport or carrier recombination. ..
- the chromophore refers to an atomic group (skeleton) that causes light emission in a fluorescent luminescent substance.
- the chromophore preferably has a skeleton having a ⁇ bond, preferably contains an aromatic ring, and preferably has a condensed aromatic ring or a condensed heteroaromatic ring.
- Examples of the fused aromatic ring or the condensed heteroaromatic ring include a phenanthrene skeleton, a stilbene skeleton, an acridone skeleton, a phenoxazine skeleton, and a phenothiazine skeleton.
- a fluorescent substance having a naphthalene skeleton, anthracene skeleton, fluorene skeleton, chrysene skeleton, triphenylene skeleton, tetracene skeleton, pyrene skeleton, perylene skeleton, coumarin skeleton, quinacridone skeleton, and naphthobisbenzofuran skeleton is preferable because of its high fluorescence quantum yield.
- a material having an anthracene skeleton is suitable as the host material.
- a substance having an anthracene skeleton is used as a host material for a fluorescent light emitting substance, it is possible to realize a light emitting layer having good luminous efficiency and durability.
- a diphenylanthracene skeleton, particularly a substance having a 9,10-diphenylanthracene skeleton is preferable because it is chemically stable.
- the host material has a carbazole skeleton
- the injection / transportability of holes is enhanced, but when the host material contains a benzocarbazole skeleton in which a benzene ring is further condensed with carbazole, the HOMO level is about 0.1 eV than that of carbazole. It is more preferable because it becomes shallower and holes are more likely to enter.
- the host material contains a dibenzocarbazole skeleton, the HOMO level is shallower than that of carbazole by about 0.1 eV, holes are easily entered, holes are easily transported, and heat resistance is high, which is suitable. Is.
- a substance having a 9,10-diphenylanthracene skeleton and a carbazole skeleton (or a benzocarbazole skeleton or a dibenzocarbazole skeleton) at the same time is further preferable as a host material.
- a benzofluorene skeleton or a dibenzofluorene skeleton may be used instead of the carbazole skeleton.
- examples of such substances are 9-phenyl-3- [4- (10-phenyl-9-anthryl) phenyl] -9H-carbazole (abbreviation: PCzPA), 3- [4- (1-naphthyl)-.
- Phenyl] -9-Phenyl-9H-carbazole (abbreviation: PCPN), 9- [4- (10-phenyl-9-anthrasenyl) phenyl] -9H-carbazole (abbreviation: CzPA), 7- [4- (10-) Phenyl-9-anthryl) phenyl] -7H-dibenzo [c, g] carbazole (abbreviation: cgDBCzPA), 6- [3- (9,10-diphenyl-2-anthryl) phenyl] -benzo [b] naphtho [1 , 2-d] Fran (abbreviation: 2mBnfPPA), 9-Phenyl-10- ⁇ 4- (9-phenyl-9H-fluoren-9-yl) biphenyl-4'-yl ⁇ anthracene (abbreviation: FLPPA), 9- (1-naphthyl) -10- [4- (2-n
- the host material may be a material in which a plurality of kinds of substances are mixed, and when a mixed host material is used, it is preferable to mix a material having an electron transport property and a material having a hole transport property. ..
- a material having an electron transport property 1: 19 to 19: 1.
- a phosphorescent light emitting substance can be used as a part of the mixed material.
- the phosphorescent light-emitting substance can be used as an energy donor that supplies excitation energy to the fluorescent light-emitting substance when the fluorescent light-emitting substance is used as the light-emitting substance.
- an excited complex may be formed between these mixed materials.
- At least one of the materials forming the excitation complex may be a phosphorescent substance.
- the HOMO level of the material having hole transportability is equal to or higher than the HOMO level of the material having electron transportability.
- the LUMO level of the material having hole transportability is equal to or higher than the LUMO level of the material having electron transportability.
- the LUMO level and HOMO level of the material can be derived from the electrochemical properties (reduction potential and oxidation potential) of the material measured by cyclic voltammetry (CV) measurement.
- the emission spectrum of the material having hole transport property, the emission spectrum of the material having electron transport property, and the emission spectrum of the mixed film in which these materials are mixed are compared, and the emission spectrum of the mixed film is compared.
- the transient photoluminescence (PL) of the material having hole transportability, the transient PL of the material having electron transportability, and the transient PL of the mixed membrane in which these materials are mixed are compared, and the transient PL lifetime of the mixed membrane is determined.
- transient PL may be read as transient electroluminescence (EL). That is, the formation of an excited complex can also be formed by comparing the transient EL of the material having hole transportability, the transient EL of the material having electron transportability, and the transient EL of the mixed membrane thereof, and observing the difference in the transient response. You can check.
- EL transient electroluminescence
- the electron transport layer 114 can be a layer having a small refractive index by having the configuration of the present invention, it is possible to form a layer having a low refractive index inside the EL layer 103 without significantly lowering the driving voltage. , It is possible to improve the external quantum efficiency of the light emitting device.
- the electron transport layer 114 having this configuration may also serve as the electron injection layer 115.
- the alkali metal or the metal complex of the alkali metal has a concentration difference (including the case where it is 0) in the electron transport layer 114 in the thickness direction.
- LiF Lithium fluoride
- CsF cesium fluoride
- CaF 2 calcium fluoride
- Liq 8-quinolinolato-lithium
- a layer containing an alkali metal or an alkaline earth metal such as, or a compound or complex thereof may be provided.
- an alkali metal, an alkaline earth metal, or a compound thereof contained in a layer made of a substance having electron transporting property, or an electride may be used. Examples of the electride include a substance in which a high concentration of electrons is added to a mixed oxide of calcium and aluminum.
- the electron transportability and water resistance of the light emitting device are improved, which is a preferable configuration.
- anions having various binding numbers of sodium and fluorine such as Na 2 F + , NaF 2 ⁇ , Na 2 F 3 ⁇ , etc.
- a signal derived from cations is observed.
- a layer containing an alkaline earth metal such as barium may be provided in contact with the cathode. This is preferable because the electron injection property from the cathode is improved.
- the layer containing barium may have a complex aromatic compound at the same time.
- a complex aromatic compound an organic compound having a phenanthroline skeleton is preferable, and 2-phenyl-9- [3- (9-phenyl-1,10-phenanthroline-2) represented by the following structural formula (400) is particularly preferable.
- -Il) Phenyl] -1,10-Phenanthroline and the like are preferable.
- the electron-injected layer 115 contains an electron-transporting substance (preferably an organic compound having a bipyridine skeleton) containing fluoride of the alkali metal or alkaline earth metal at a concentration of 50 wt% or more so as to be in a microcrystalline state. It is also possible to use a layer that has been removed. Since the layer has a low refractive index, it is possible to provide a light emitting device having better external quantum efficiency.
- an electron-transporting substance preferably an organic compound having a bipyridine skeleton
- a charge generation layer 116 may be provided instead of the electron injection layer 115 of FIG. 1A (FIG. 1B).
- the charge generation layer 116 is a layer capable of injecting holes into the layer in contact with the cathode side and electrons into the layer in contact with the anode side by applying an electric potential.
- the charge generation layer 116 includes at least a P-type layer 117.
- the P-type layer 117 is preferably formed by using the composite material mentioned as a material that can form the hole injection layer 111 described above. Further, the P-type layer 117 may be formed by laminating a film containing the above-mentioned acceptor material and a film containing a hole transport material as a material constituting the composite material. By applying an electric potential to the P-type layer 117, electrons are injected into the electron transport layer 114 and holes are injected into the cathode 102, and the light emitting device operates.
- the charge generation layer 116 is provided with either one or both of the electron relay layer 118 and the electron injection buffer layer 119 in addition to the P-type layer 117.
- the electron relay layer 118 contains at least a substance having electron transportability, and has a function of preventing interaction between the electron injection buffer layer 119 and the P-type layer 117 and smoothly transferring electrons.
- the LUMO level of the electron-transporting substance contained in the electron relay layer 118 is the LUMO level of the accepting substance in the P-type layer 117 and the substance contained in the layer in contact with the charge generating layer 116 in the electron transporting layer 114. It is preferably between the LUMO level.
- the specific energy level of the LUMO level in the electron-transporting material used for the electron relay layer 118 is preferably ⁇ 5.0 eV or higher, preferably ⁇ 5.0 eV or higher and ⁇ 3.0 eV or lower.
- the substance having electron transportability used for the electron relay layer 118 it is preferable to use a phthalocyanine-based material or a metal complex having a metal-oxygen bond and an aromatic ligand.
- the electron injection buffer layer 119 includes alkali metals, alkaline earth metals, rare earth metals, and compounds thereof (alkali metal compounds (including oxides such as lithium oxide, halides, and carbonates such as lithium carbonate and cesium carbonate). , Alkaline earth metal compounds (including oxides, halides and carbonates), or rare earth metal compounds (including oxides, halides and carbonates)) and other highly electron-injectable substances can be used. Is.
- the donor substance includes an alkali metal, an alkaline earth metal, a rare earth metal, and a compound thereof (as a donor substance).
- Alkali metal compounds including oxides such as lithium oxide, halides, and carbonates such as lithium carbonate and cesium carbonate
- alkaline earth metal compounds including oxides, halides, and carbonates
- rare earth metal compounds include oxides, halides, and carbonates
- organic compounds such as tetrathianaphthalene (abbreviation: TTN), nickerosen, and decamethyl nickerosen can also be used.
- the substance having electron transportability it can be formed by using the same material as the material constituting the electron transport layer 114 described above. Since the material is an organic compound having a low refractive index, it is possible to obtain a light emitting device having good external quantum efficiency by using it for the electron injection buffer layer 119.
- a metal having a small work function (specifically, 3.8 eV or less), an alloy, an electrically conductive compound, a mixture thereof, or the like
- cathode materials include alkali metals such as lithium (Li) and cesium (Cs), and Group 1 or Group 1 of the Periodic Table of Elements such as magnesium (Mg), calcium (Ca), and strontium (Sr).
- alkali metals such as lithium (Li) and cesium (Cs)
- Group 1 or Group 1 of the Periodic Table of Elements such as magnesium (Mg), calcium (Ca), and strontium (Sr).
- Mg magnesium
- Ca calcium
- examples thereof include elements belonging to Group 2, rare earth metals such as alloys containing them (MgAg, AlLi), europium (Eu), ytterbium (Yb), and alloys containing these.
- various indium oxide-tin oxide containing Al, Ag, ITO, silicon or silicon oxide can be used regardless of the size of the work function.
- a conductive material can be used as the cathode 102.
- the cathode 102 When the cathode 102 is made of a material having transparency to visible light, it can be a light emitting device that emits light from the cathode side as shown in FIG. 1D.
- a light emitting device having such a cathode can be a so-called top emission type light emitting device when the anode 101 is manufactured on the substrate side.
- These conductive materials can be formed into a film by using a dry method such as a vacuum vapor deposition method or a sputtering method, an inkjet method, a spin coating method, or the like. Further, it may be formed by a wet method using a sol-gel method, or may be formed by a wet method using a paste of a metal material.
- a dry method such as a vacuum vapor deposition method or a sputtering method, an inkjet method, a spin coating method, or the like. Further, it may be formed by a wet method using a sol-gel method, or may be formed by a wet method using a paste of a metal material.
- a method for forming the EL layer 103 various methods can be used regardless of whether it is a dry method or a wet method.
- a vacuum vapor deposition method, a gravure printing method, an offset printing method, a screen printing method, an inkjet method, a spin coating method, or the like may be used.
- each electrode or each layer described above may be formed by using a different film forming method.
- the structure of the layer provided between the anode 101 and the cathode 102 is not limited to the above. However, a light emitting region in which holes and electrons recombine at a portion distant from the anode 101 and the cathode 102 so that quenching caused by the proximity of the light emitting region to the metal used for the electrode or carrier injection layer is suppressed. Is preferable.
- the hole transport layer and the electron transport layer in contact with the light emitting layer 113 suppresses the energy transfer from the excitons generated in the light emitting layer, so that the band gap thereof.
- a light emitting device also referred to as a laminated element or a tandem type element
- This light emitting device is a light emitting device having a plurality of light emitting units between the anode and the cathode.
- One light emitting unit has substantially the same configuration as the EL layer 103 shown in FIG. 1A. That is, it can be said that the tandem type element is a light emitting device having a plurality of light emitting units, and the light emitting device shown in FIG. 1A or FIG. 1B is a light emitting device having one light emitting unit.
- a first light emitting unit and a second light emitting unit are laminated between an anode and a cathode, and a charge generation layer is provided between the first light emitting unit and the second light emitting unit.
- the anode and cathode correspond to the anode 101 and the cathode 102 in FIG. 1A, respectively, and the same ones described in the description of FIG. 1A can be applied.
- the first light emitting unit and the second light emitting unit may have the same configuration or different configurations from each other.
- the charge generation layer in the tandem type element has a function of injecting electrons into one light emitting unit and injecting holes into the other light emitting unit when a voltage is applied to the anode and the cathode. That is, when a voltage is applied so that the potential of the anode is higher than the potential of the cathode, the charge generation layer injects electrons into the first light emitting unit and holes into the second light emitting unit. Anything is fine.
- the charge generation layer is preferably formed with the same configuration as the charge generation layer 116 described with reference to FIG. 1B. Since the composite material of the organic compound and the metal oxide is excellent in carrier injection property and carrier transport property, low voltage drive and low current drive can be realized. When the surface of the light emitting unit on the anode side is in contact with the charge generating layer, the charge generating layer can also serve as the hole injection layer of the light emitting unit, so that the light emitting unit does not have a hole injection layer. Also good.
- the electron injection buffer layer 119 plays the role of the electron injection layer in the light emitting unit on the anode side, so that the light emitting unit on the anode side does not necessarily have electrons. There is no need to form an injection layer.
- the tandem type element having two light emitting units has been described above, but the same can be applied to a tandem type element in which three or more light emitting units are laminated.
- a tandem type element in which three or more light emitting units are laminated.
- each emission unit by making the emission color of each emission unit different, it is possible to obtain emission of a desired color as the entire emission device. For example, in a light emitting device having two light emitting units, a light emitting device that emits white light as a whole by obtaining a red and green light emitting color from the first light emitting unit and a blue light emitting color from the second light emitting unit. It is also possible to get it.
- each layer or electrode such as the EL layer 103, the first light emitting unit, the second light emitting unit, and the charge generation layer may be, for example, a vapor deposition method (including a vacuum vapor deposition method) or a droplet ejection method (both an inkjet method). It can be formed by using a method such as a coating method or a gravure printing method. They may also include small molecule materials, medium molecule materials (including oligomers, dendrimers), or polymer materials.
- FIGS. 2A and 2B a light emitting device manufactured by using the light emitting device according to the first embodiment will be described with reference to FIGS. 2A and 2B.
- 2A is a top view showing the light emitting device
- FIG. 2B is a cross-sectional view cut along the alternate long and short dash line AB and the alternate long and short dash line CD shown in FIG. 2A.
- This light emitting device includes a drive circuit unit (source line drive circuit) 601, a pixel unit 602, and a drive circuit unit (gate line drive circuit) 603 shown by dotted lines to control the light emission of the light emitting device.
- 604 is a sealing substrate
- 605 is a sealing material
- the inside surrounded by the sealing material 605 is a space 607.
- the routing wiring 608 is a wiring for transmitting signals input to the source line drive circuit 601 and the gate line drive circuit 603, and is a video signal, a clock signal, and a video signal and a clock signal from the FPC (flexible print circuit) 609 which is an external input terminal. Receives start signal, reset signal, etc. Although only the FPC is shown here, a printed wiring board (PWB) may be attached to the FPC.
- the light emitting device in the present specification includes not only the light emitting device main body but also a state in which an FPC or PWB is attached to the light emitting device main body.
- a drive circuit unit and a pixel unit are formed on the element substrate 610, and here, a source line drive circuit 601 which is a drive circuit unit and one pixel in the pixel unit 602 are shown.
- the element substrate 610 is manufactured by using a substrate made of glass, quartz, organic resin, metal, alloy, semiconductor, etc., as well as a plastic substrate made of FRP (Fiber Reinforced Plastics), PVF (polyvinyl flolide), polyester, acrylic resin, etc. do it.
- FRP Fiber Reinforced Plastics
- PVF polyvinyl flolide
- polyester acrylic resin, etc. do it.
- the structure of the transistor used for the pixel and the drive circuit is not particularly limited. For example, it may be an inverted stagger type transistor or a stagger type transistor. Further, a top gate type transistor or a bottom gate type transistor may be used.
- the semiconductor material used for the transistor is not particularly limited, and for example, silicon, germanium, silicon carbide, gallium nitride and the like can be used. Alternatively, an oxide semiconductor containing at least one of indium, gallium, and zinc, such as In-Ga-Zn oxide, may be used.
- the crystallinity of the semiconductor material used for the transistor is not particularly limited, and either an amorphous semiconductor or a semiconductor having crystallinity (a fine crystal semiconductor, a polycrystalline semiconductor, a single crystal semiconductor, or a semiconductor having a partially crystallized region). May be used. It is preferable to use a semiconductor having crystallinity because deterioration of transistor characteristics can be suppressed.
- an oxide semiconductor to a semiconductor device such as a transistor used for a touch sensor or the like, which will be described later, in addition to the transistor provided in the pixel or the drive circuit.
- a semiconductor device such as a transistor used for a touch sensor or the like, which will be described later
- an oxide semiconductor having a wider bandgap than silicon By using an oxide semiconductor having a wider bandgap than silicon, the current in the off state of the transistor can be reduced.
- the oxide semiconductor preferably contains at least indium (In) or zinc (Zn). Further, it may be an oxide semiconductor containing an oxide represented by an In-M-Zn oxide (M is a metal such as Al, Ti, Ga, Ge, Y, Zr, Sn, La, Ce or Hf). More preferred.
- M is a metal such as Al, Ti, Ga, Ge, Y, Zr, Sn, La, Ce or Hf. More preferred.
- the semiconductor layer has a plurality of crystal portions, and the c-axis of the crystal portion is oriented perpendicular to the surface to be formed of the semiconductor layer or the upper surface of the semiconductor layer, and grain boundaries are formed between adjacent crystal portions. It is preferable to use an oxide semiconductor film that does not have.
- the transistor having the above-mentioned semiconductor layer can retain the electric charge accumulated in the capacitance through the transistor for a long period of time due to its small off current.
- the transistor having the above-mentioned semiconductor layer can retain the electric charge accumulated in the capacitance through the transistor for a long period of time due to its small off current.
- a base film to stabilize the characteristics of the transistor.
- an inorganic insulating film such as a silicon oxide film, a silicon nitride film, a silicon oxide film, or a silicon nitride film can be used, and can be produced as a single layer or laminated.
- the undercoat is coated by sputtering method, chemical vapor deposition (CVD) method (plasma CVD method, thermal CVD method, MOCVD (Metal Organic CVD) method, etc.), atomic layer deposition (ALD) method, and coating. It can be formed by using a method, a printing method, or the like. The undercoat may not be provided if it is not necessary.
- the FET 623 indicates one of the transistors formed in the drive circuit unit 601.
- the drive circuit may be formed of various CMOS circuits, epitaxial circuits or MIMO circuits.
- the driver integrated type in which the drive circuit is formed on the substrate is shown, but it is not always necessary, and the drive circuit can be formed on the outside instead of on the substrate.
- the pixel unit 602 is formed by a plurality of pixels including a switching FET 611, a current control FET 612, and an anode 613 electrically connected to the drain thereof, but the pixel portion 602 is not limited to this, and is not limited to three or more.
- a pixel unit may be a combination of an FET and a capacitive element.
- the insulator 614 is formed so as to cover the end portion of the anode 613.
- it can be formed by using a positive type photosensitive acrylic resin film.
- a curved surface having a curvature is formed at the upper end portion or the lower end portion of the insulating material 614.
- a positive photosensitive acrylic resin is used as the material of the insulating material 614, it is preferable that only the upper end portion of the insulating material 614 has a curved surface having a radius of curvature (0.2 ⁇ m to 3 ⁇ m).
- a negative type photosensitive resin or a positive type photosensitive resin can be used as the insulating material 614.
- An EL layer 616 and a cathode 617 are formed on the anode 613, respectively.
- the material used for the anode 613 it is desirable to use a material having a large work function.
- a laminated structure of a titanium nitride film and a film containing aluminum as a main component, a three-layer structure of a titanium nitride film and a film containing aluminum as a main component, and a titanium nitride film can be used. It should be noted that the laminated structure has low resistance as wiring, good ohmic contact can be obtained, and can further function as an anode.
- the EL layer 616 is formed by various methods such as a thin-film deposition method using a thin-film deposition mask, an inkjet method, and a spin coating method.
- the EL layer 616 includes a configuration as described in the first embodiment.
- a low molecular weight compound or a high molecular weight compound may be used as another material constituting the EL layer 616.
- the cathode 617 As the material formed on the EL layer 616 and used for the cathode 617, a material having a small work function (Al, Mg, Li, Ca, or an alloy or compound thereof (MgAg, MgIn, AlLi, etc.)) is used. Is preferable.
- the cathode 617 is a thin metal thin film and a transparent conductive film (ITO, indium oxide containing 2 to 20 wt% zinc oxide. It is preferable to use a laminate with indium tin oxide containing silicon, zinc oxide (ZnO), etc.).
- a light emitting device is formed by the anode 613, the EL layer 616, and the cathode 617.
- the light emitting device is the light emitting device according to the first embodiment. Although a plurality of light emitting devices are formed in the pixel portion, in the light emitting device according to the present embodiment, both the light emitting device according to the first embodiment and the light emitting device having other configurations are mixed. You may be doing it.
- the sealing substrate 604 by bonding the sealing substrate 604 to the element substrate 610 with the sealing material 605, the light emitting device 618 is provided in the space 607 surrounded by the element substrate 610, the sealing substrate 604, and the sealing material 605.
- the space 607 is filled with a filler, and may be filled with an inert gas (nitrogen, argon, etc.) or a sealing material.
- an epoxy resin or glass frit for the sealing material 605. Further, it is desirable that these materials are materials that do not allow moisture or oxygen to permeate as much as possible. Further, as the material used for the sealing substrate 604, in addition to the glass substrate and the quartz substrate, a plastic substrate made of FRP (Fiber Reinforced Plastics), PVF (polyvinyl fluoride), polyester, acrylic resin or the like can be used.
- FRP Fiber Reinforced Plastics
- PVF polyvinyl fluoride
- polyester acrylic resin or the like
- a protective film may be provided on the cathode.
- the protective film may be formed of an organic resin film or an inorganic insulating film. Further, a protective film may be formed so as to cover the exposed portion of the sealing material 605. Further, the protective film can be provided so as to cover the surface and side surfaces of the pair of substrates, and the exposed side surfaces such as the sealing layer and the insulating layer.
- the protective film a material that does not easily allow impurities such as water to permeate can be used. Therefore, it is possible to effectively suppress the diffusion of impurities such as water from the outside to the inside.
- oxides, nitrides, fluorides, sulfides, ternary compounds, metals, polymers and the like can be used, and for example, aluminum oxide, hafnium oxide, hafnium silicate, lanthanum oxide and oxidation can be used.
- nitride Materials including hafnium, silicon nitride, tantalum nitride, titanium nitride, niobium nitride, molybdenum nitride, zirconium nitride or gallium nitride, nitrides including titanium and aluminum, oxides containing titanium and aluminum, oxides containing aluminum and zinc , A sulfide containing manganese and zinc, a sulfide containing cerium and strontium, an oxide containing erbium and aluminum, an oxide containing yttrium and zirconium, and the like can be used.
- the protective film is preferably formed by using a film forming method having good step coverage (step coverage).
- a film forming method having good step coverage is the ALD method. It is preferable to use a material that can be formed by the ALD method for the protective film. By using the ALD method, it is possible to form a protective film having a dense, reduced defects such as cracks and pinholes, or a uniform thickness. In addition, damage to the processed member when forming the protective film can be reduced.
- the ALD method it is possible to form a uniform protective film with few defects on the front surface having a complicated uneven shape, the upper surface, the side surface and the back surface of the touch panel.
- a light emitting device manufactured by using the light emitting device according to the first embodiment can be obtained.
- the light emitting device in the present embodiment uses the light emitting device according to the first embodiment, it is possible to obtain a light emitting device having good characteristics. Specifically, since the light emitting device according to the first embodiment has good luminous efficiency, it can be a light emitting device having low power consumption.
- FIGS. 3A and 3B show an example of a light emitting device in which a light emitting device exhibiting white light emission is formed and a colored layer (color filter) or the like is provided to make the light emitting device full color.
- Unit 1040 drive circuit unit 1041, light emitting device anode 1024W, light emitting device anode 1024R, light emitting device anode 1024G, light emitting device anode 1024B, partition wall 1025, EL layer 1028, light emitting device cathode 1029, sealing substrate 1031.
- the sealing material 1032 and the like are shown in the figure.
- the colored layer (red colored layer 1034R, green colored layer 1034G, blue colored layer 1034B) is provided on the transparent base material 1033. Further, a black matrix 1035 may be further provided. The transparent base material 1033 provided with the colored layer and the black matrix 1035 is aligned and fixed to the substrate 1001. The colored layer and the black matrix 1035 are covered with an overcoat layer. Further, in FIG. 3A, the colored layer 1034R, green colored layer 1034G, blue colored layer 1034B) is provided on the transparent base material 1033. Further, a black matrix 1035 may be further provided. The transparent base material 1033 provided with the colored layer and the black matrix 1035 is aligned and fixed to the substrate 1001. The colored layer and the black matrix 1035 are covered with an overcoat layer. Further, in FIG.
- the image can be expressed by the pixels of four colors.
- FIG. 3B shows an example in which a colored layer (red colored layer 1034R, green colored layer 1034G, blue colored layer 1034B) is formed between the gate insulating film 1003 and the first interlayer insulating film 1020.
- the colored layer may be provided between the substrate 1001 and the sealing substrate 1031.
- the light emitting device has a structure that extracts light to the substrate 1001 side on which the FET is formed (bottom emission type), but has a structure that extracts light to the sealing substrate 1031 side (top emission type). ) May be used as a light emitting device.
- a cross-sectional view of the top emission type light emitting device is shown in FIG.
- a substrate that does not transmit light can be used for the substrate 1001. It is formed in the same manner as the bottom emission type light emitting device until the connection electrode for connecting the FET and the anode of the light emitting device is manufactured.
- a third interlayer insulating film 1037 is formed so as to cover the electrode 1022. This insulating film may play a role of flattening.
- the third interlayer insulating film 1037 can be formed by using the same material as the second interlayer insulating film and other known materials.
- the anode 1024W of the light emitting device, the anode 1024R of the light emitting device, the anode 1024G of the light emitting device, and the anode 1024B of the light emitting device are referred to as an anode here, but may be a cathode. Further, in the case of the top emission type light emitting device as shown in FIG. 4, it is preferable to use the anode as a reflecting electrode.
- the structure of the EL layer 1028 is the same as that described as the EL layer 103 in the first embodiment, and has an element structure such that white light emission can be obtained.
- the sealing can be performed by the sealing substrate 1031 provided with the colored layer (red colored layer 1034R, green colored layer 1034G, blue colored layer 1034B).
- the sealing substrate 1031 may be provided with a black matrix 1035 so as to be located between the pixels.
- the colored layer (red colored layer 1034R, green colored layer 1034G, blue colored layer 1034B) and the black matrix 1035 may be covered with an overcoat layer.
- a substrate having translucency is used as the sealing substrate 1031.
- full-color display with four colors of red, green, blue, and white is shown here, the present invention is not particularly limited, and full-color with four colors of red, yellow, green, and blue, and three colors of red, green, and blue. It may be displayed.
- the microcavity structure can be preferably applied.
- a light emitting device having a microcavity structure can be obtained by using a reflecting electrode as an anode and a semitransmissive / semi-reflecting electrode as a cathode.
- An EL layer is provided between the reflective electrode and the semi-transmissive / semi-reflective electrode, and at least a light emitting layer serving as a light emitting region is provided.
- the reflective electrode is a film having a visible light reflectance of 40% to 100%, preferably 70% to 100%, and a resistivity of 1 ⁇ 10 ⁇ 2 ⁇ cm or less.
- the semi-transmissive / semi-reflective electrode is a film having a visible light reflectance of 20% to 80%, preferably 40% to 70%, and a resistivity of 1 ⁇ 10 ⁇ 2 ⁇ cm or less. ..
- the light emitted from the light emitting layer included in the EL layer is reflected by the reflective electrode and the semi-transmissive / semi-reflective electrode and resonates.
- the light emitting device can change the optical distance between the reflective electrode and the transflective / semi-reflective electrode by changing the thickness of the transparent conductive film, the above-mentioned composite material, the carrier transport material, and the like. As a result, it is possible to intensify the light having a wavelength that resonates between the reflecting electrode and the semi-transmissive / semi-reflective electrode, and to attenuate the light having a wavelength that does not resonate.
- the light reflected and returned by the reflecting electrode causes large interference with the light directly incident on the semi-transmissive / semi-reflecting electrode from the light emitting layer (first incident light), and is therefore reflected.
- the EL layer may have a structure having a plurality of light emitting layers or a structure having a single light emitting layer, and may be combined with, for example, the above-mentioned configuration of the tandem type light emitting device.
- a plurality of EL layers may be provided on one light emitting device with a charge generation layer interposed therebetween, and the present invention may be applied to a configuration in which a single or a plurality of light emitting layers are formed in each EL layer.
- the microcavity structure By having a microcavity structure, it is possible to increase the emission intensity in the front direction of a specific wavelength, so that it is possible to reduce power consumption.
- the microcavity structure that matches the wavelength of each color can be applied to all the sub-pixels in addition to the effect of improving the brightness by yellow light emission. It can be a light emitting device with good characteristics.
- the light emitting device in the present embodiment uses the light emitting device according to the first embodiment, it is possible to obtain a light emitting device having good characteristics. Specifically, since the light emitting device according to the first embodiment has good luminous efficiency, it can be a light emitting device having low power consumption.
- FIG. 5A and 5B show a passive matrix type light emitting device manufactured by applying the present invention.
- 5A is a perspective view showing the light emitting device
- FIG. 5B is a cross-sectional view of FIG. 5A cut along the alternate long and short dash line XY.
- an EL layer 955 is provided between the electrode 952 and the electrode 956 on the substrate 951.
- the end of the electrode 952 is covered with an insulating layer 953.
- a partition wall layer 954 is provided on the insulating layer 953.
- the side wall of the partition wall layer 954 has an inclination such that the distance between one side wall and the other side wall becomes narrower as it gets closer to the substrate surface. That is, the cross section in the short side direction of the partition wall layer 954 is trapezoidal, and the bottom side (the side facing the same direction as the surface direction of the insulating layer 953 and in contact with the insulating layer 953) is the upper side (the surface of the insulating layer 953). It faces in the same direction as the direction, and is shorter than the side that does not contact the insulating layer 953).
- the passive matrix type light emitting device also uses the light emitting device according to the first embodiment, and can be a highly reliable light emitting device or a light emitting device having low power consumption.
- the light emitting device described above is a light emitting device that can be suitably used as a display device for expressing an image because it is possible to control a large number of minute light emitting devices arranged in a matrix.
- FIG. 6B is a top view of the lighting device
- FIG. 6A is a cross-sectional view taken along the line segment ef shown in FIG. 6B.
- the anode 401 is formed on the translucent substrate 400 which is a support.
- the anode 401 corresponds to the anode 101 in the first embodiment.
- the anode 401 is formed of a translucent material.
- a pad 412 for supplying a voltage to the cathode 404 is formed on the substrate 400.
- An EL layer 403 is formed on the anode 401.
- the EL layer 403 corresponds to the configuration of the EL layer 103 in the first embodiment, or the configuration in which the first light emitting unit, the second light emitting unit, and the charge generation layer are combined. Please refer to the description for these configurations.
- the cathode 404 is formed by covering the EL layer 403.
- the cathode 404 corresponds to the cathode 102 in the first embodiment.
- the cathode 404 is formed of a highly reflective material. A voltage is supplied to the cathode 404 by connecting it to the pad 412.
- the lighting device showing the light emitting device having the anode 401, the EL layer 403, and the cathode 404 in the present embodiment has. Since the light emitting device is a light emitting device having high luminous efficiency, the lighting device in the present embodiment can be a lighting device having low power consumption.
- the lighting device is completed by fixing and sealing the substrate 400 on which the light emitting device having the above configuration is formed and the sealing substrate 407 using the sealing material 405 and the sealing material 406. Either the sealing material 405 and the sealing material 406 may be used. Further, a desiccant can be mixed with the inner sealing material 406 (not shown in FIG. 6B), whereby moisture can be adsorbed, which leads to improvement in reliability.
- an IC chip 420 or the like on which a converter or the like is mounted may be provided on the IC chip 420.
- the lighting device according to the present embodiment uses the light emitting device according to the first embodiment for the EL element, and can be a lighting device having low power consumption.
- the light emitting device according to the first embodiment is a light emitting device having good luminous efficiency and low power consumption.
- the electronic device described in the present embodiment can be an electronic device having a light emitting unit having low power consumption.
- Examples of electronic devices to which the above light emitting device is applied include television devices (also referred to as televisions or television receivers), monitors for computers, digital cameras, digital video cameras, digital photo frames, mobile phones (mobile phones, etc.). (Also referred to as a mobile phone device), a portable game machine, a mobile information terminal, a sound reproduction device, a large game machine such as a pachinko machine, and the like. Specific examples of these electronic devices are shown below.
- FIG. 7A shows an example of a television device.
- the display unit 7103 is incorporated in the housing 7101. Further, here, a configuration in which the housing 7101 is supported by the stand 7105 is shown. An image can be displayed by the display unit 7103, and the display unit 7103 is configured by arranging the light emitting devices according to the first embodiment in a matrix.
- the operation of the television device can be performed by the operation switch provided in the housing 7101 and the separate remote control operation machine 7110.
- the operation key 7109 included in the remote controller 7110 can be used to operate the channel and volume, and can operate the image displayed on the display unit 7103.
- the remote controller 7110 may be provided with a display unit 7107 for displaying information output from the remote controller 7110.
- the light emitting device according to the first embodiment, which is arranged in a matrix, can also be applied to the display unit 7107.
- the television device shall be equipped with a receiver, modem, etc.
- the receiver can receive general television broadcasts, and by connecting to a wired or wireless communication network via a modem, one-way (sender to receiver) or two-way (sender and receiver). It is also possible to perform information communication between (or between receivers, etc.).
- FIG. 7B1 is a computer, which includes a main body 7201, a housing 7202, a display unit 7203, a keyboard 7204, an external connection port 7205, a pointing device 7206, and the like.
- This computer is manufactured by arranging the light emitting devices according to the first embodiment in a matrix and using them in the display unit 7203.
- the computer of FIG. 7B1 may have the form shown in FIG. 7B2.
- the computer of FIG. 7B2 is provided with a display unit 7210 instead of the keyboard 7204 and the pointing device 7206.
- the display unit 7210 is a touch panel type, and input can be performed by operating the input display displayed on the display unit 7210 with a finger or a dedicated pen. Further, the display unit 7210 can display not only the input display but also other images. Further, the display unit 7203 may also be a touch panel. By connecting the two screens with a hinge, it is possible to prevent troubles such as damage or damage to the screens during storage and transportation.
- FIG. 7C shows an example of a mobile terminal.
- the mobile phone includes an operation button 7403, an external connection port 7404, a speaker 7405, a microphone 7406, and the like, in addition to the display unit 7402 incorporated in the housing 7401.
- the mobile phone has a display unit 7402 manufactured by arranging the light emitting devices according to the first embodiment in a matrix.
- the mobile terminal shown in FIG. 7C can also be configured so that information can be input by touching the display unit 7402 with a finger or the like. In this case, operations such as making a phone call or composing an e-mail can be performed by touching the display unit 7402 with a finger or the like.
- the screen of the display unit 7402 mainly has three modes. The first is a display mode mainly for displaying an image, and the second is an input mode mainly for inputting information such as characters. The third is a display + input mode in which two modes, a display mode and an input mode, are mixed.
- the display unit 7402 may be set to a character input mode mainly for inputting characters, and the characters displayed on the screen may be input. In this case, it is preferable to display the keyboard or the number button on most of the screen of the display unit 7402.
- the orientation (vertical or horizontal) of the mobile terminal can be determined and the screen display of the display unit 7402 can be displayed. It can be switched automatically.
- the screen mode can be switched by touching the display unit 7402 or by operating the operation button 7403 of the housing 7401. It is also possible to switch depending on the type of the image displayed on the display unit 7402. For example, if the image signal displayed on the display unit is moving image data, the display mode is switched, and if the image signal is text data, the input mode is switched.
- the input mode the signal detected by the optical sensor of the display unit 7402 is detected, and if there is no input by the touch operation of the display unit 7402 for a certain period of time, the screen mode is switched from the input mode to the display mode. You may control it.
- the display unit 7402 can also function as an image sensor.
- the person can be authenticated by touching the display unit 7402 with a palm or a finger and taking an image of a palm print, a fingerprint, or the like.
- a backlight that emits near-infrared light or a sensing light source that emits near-infrared light is used for the display unit, it is possible to image finger veins, palmar veins, and the like.
- the configuration shown in the present embodiment can be used by appropriately combining the configurations shown in the first to fourth embodiments.
- the range of application of the light emitting device provided with the light emitting device according to the first embodiment is extremely wide, and this light emitting device can be applied to electronic devices in all fields.
- an electronic device having low power consumption can be obtained.
- FIG. 8A is a schematic diagram showing an example of a cleaning robot.
- the cleaning robot 5100 has a display 5101 arranged on the upper surface, a plurality of cameras 5102 arranged on the side surface, a brush 5103, and an operation button 5104. Although not shown, the lower surface of the cleaning robot 5100 is provided with tires, suction ports, and the like.
- the cleaning robot 5100 also includes various sensors such as an infrared sensor, an ultrasonic sensor, an acceleration sensor, a piezo sensor, an optical sensor, and a gyro sensor. Further, the cleaning robot 5100 is provided with a wireless communication means.
- the cleaning robot 5100 is self-propelled, can detect dust 5120, and can suck dust from a suction port provided on the lower surface.
- the cleaning robot 5100 can analyze the image taken by the camera 5102 and determine the presence or absence of obstacles such as walls, furniture, and steps. Further, when an object that is likely to be entangled with the brush 5103 such as wiring is detected by image analysis, the rotation of the brush 5103 can be stopped.
- the display 5101 can display the remaining battery level, the amount of dust sucked, and the like.
- the route traveled by the cleaning robot 5100 may be displayed on the display 5101. Further, the display 5101 may be a touch panel, and the operation buttons 5104 may be provided on the display 5101.
- the cleaning robot 5100 can communicate with a portable electronic device 5140 such as a smartphone.
- the image taken by the camera 5102 can be displayed on the portable electronic device 5140. Therefore, the owner of the cleaning robot 5100 can know the state of the room even when he / she is out. Further, the display of the display 5101 can be confirmed by a portable electronic device such as a smartphone.
- the light emitting device of one aspect of the present invention can be used for the display 5101.
- the robot 2100 shown in FIG. 8B includes a computing device 2110, an illuminance sensor 2101, a microphone 2102, an upper camera 2103, a speaker 2104, a display 2105, a lower camera 2106, an obstacle sensor 2107, and a moving mechanism 2108.
- the microphone 2102 has a function of detecting a user's voice, environmental sound, and the like. Further, the speaker 2104 has a function of emitting sound.
- the robot 2100 can communicate with the user by using the microphone 2102 and the speaker 2104.
- the display 2105 has a function of displaying various information.
- the robot 2100 can display the information desired by the user on the display 2105.
- the display 2105 may be equipped with a touch panel. Further, the display 2105 may be a removable information terminal, and by installing the display 2105 at a fixed position of the robot 2100, charging and data transfer are possible.
- the upper camera 2103 and the lower camera 2106 have a function of photographing the surroundings of the robot 2100. Further, the obstacle sensor 2107 can detect the presence or absence of an obstacle in the traveling direction when the robot 2100 moves forward by using the moving mechanism 2108. The robot 2100 can recognize the surrounding environment and move safely by using the upper camera 2103, the lower camera 2106, and the obstacle sensor 2107.
- the light emitting device of one aspect of the present invention can be used for the display 2105.
- FIG. 8C is a diagram showing an example of a goggle type display.
- the goggle type display includes, for example, a housing 5000, a display unit 5001, a display unit 5002, a speaker 5003, an LED lamp 5004, an operation key (including a power switch or an operation switch), a connection terminal 5006, and a sensor 5007 (force, displacement, Position, velocity, acceleration, angular velocity, rotation speed, distance, light, liquid, magnetism, temperature, chemical substance, voice, time, hardness, electric field, current, voltage, power, radiation, flow rate, humidity, gradient, vibration, smell, It also has a function of measuring infrared rays), a microphone 5008, a support portion 5012, an earphone 5013, and the like.
- the light emitting device of one aspect of the present invention can be used for the display unit 5001 and the display unit 5002.
- FIG. 9 is an example in which the light emitting device according to the first embodiment is used for a desk lamp which is a lighting device.
- the desk lamp shown in FIG. 9 has a housing 2001 and a light source 2002, and the lighting device according to the third embodiment may be used as the light source 2002.
- FIG. 10 is an example in which the light emitting device according to the first embodiment is used as an indoor lighting device 3001. Since the light emitting device according to the first embodiment is a light emitting device having high luminous efficiency, it can be a lighting device having low power consumption. Further, since the light emitting device according to the first embodiment can have a large area, it can be used as a lighting device having a large area. Further, since the light emitting device according to the first embodiment is thin, it can be used as a thin lighting device.
- the light emitting device according to the first embodiment can also be mounted on the windshield and dashboard of an automobile.
- FIG. 11 shows an aspect in which the light emitting device according to the first embodiment is used for a windshield and a dashboard of an automobile.
- the display area 5200 to the display area 5203 are display areas provided by using the light emitting device according to the first embodiment.
- the display area 5200 and the display area 5201 are display devices equipped with the light emitting device according to the first embodiment provided on the windshield of an automobile.
- the light emitting device according to the first embodiment can be a so-called see-through display device in which the opposite side can be seen through by manufacturing the anode and the cathode with electrodes having translucency. If the display is in a see-through state, even if it is installed on the windshield of an automobile, it can be installed without obstructing the view.
- a transistor for driving it is preferable to use a transistor having translucency, such as an organic transistor made of an organic semiconductor material or a transistor using an oxide semiconductor.
- the display area 5202 is a display device equipped with the light emitting device according to the first embodiment provided in the pillar portion. By projecting an image from an image pickup means provided on the vehicle body on the display area 5202, the field of view blocked by the pillars can be complemented.
- the display area 5203 provided in the dashboard portion compensates for blind spots and enhances safety by projecting an image from an imaging means provided on the outside of the automobile in a field of view blocked by the vehicle body. Can be done. By projecting the image so as to complement the invisible part, it is possible to confirm the safety more naturally and without discomfort.
- the display area 5203 can provide various information by displaying navigation information, a speedometer, a tachometer, an air conditioner setting, and the like.
- the display items and layout of the display can be changed as appropriate according to the user's preference. It should be noted that these information can also be provided in the display area 5200 to the display area 5202. Further, the display area 5200 to the display area 5203 can also be used as a lighting device.
- FIGS. 12A and 12B show a foldable mobile information terminal 5150.
- the foldable portable information terminal 5150 has a housing 5151, a display area 5152, and a bent portion 5153.
- FIG. 12A shows a mobile information terminal 5150 in an expanded state.
- FIG. 12B shows a mobile information terminal in a folded state.
- the portable information terminal 5150 has a large display area 5152, it is compact and excellent in portability when folded.
- the display area 5152 can be folded in half by the bent portion 5153.
- the bent portion 5153 is composed of a stretchable member and a plurality of support members. When folded, the stretchable member is stretched, and the bent portion 5153 is folded with a radius of curvature of 2 mm or more, preferably 3 mm or more. Is done.
- the display area 5152 may be a touch panel (input / output device) equipped with a touch sensor (input device).
- the light emitting device of one aspect of the present invention can be used for the display area 5152.
- FIGS. 13A to 13C show a foldable mobile information terminal 9310.
- FIG. 13A shows a mobile information terminal 9310 in an expanded state.
- FIG. 13B shows a mobile information terminal 9310 in a state of being changed from one of the expanded state or the folded state to the other.
- FIG. 13C shows a mobile information terminal 9310 in a folded state.
- the mobile information terminal 9310 is excellent in portability in the folded state, and is excellent in the listability of the display due to the wide seamless display area in the unfolded state.
- the display panel 9311 is supported by three housings 9315 connected by a hinge 9313.
- the display panel 9311 may be a touch panel (input / output device) equipped with a touch sensor (input device). Further, the display panel 9311 can be reversibly deformed from the unfolded state to the folded state of the portable information terminal 9310 by bending between the two housings 9315 via the hinge 9313.
- the light emitting device of one aspect of the present invention can be used for the display panel 9311.
- the absorption spectrum was measured using an ultraviolet-visible spectrophotometer (V550 type manufactured by JASCO Corporation), and the spectrum measured by putting only dehydrated acetone in a quartz cell was subtracted.
- a fluorometer (FP-8600 manufactured by JASCO Corporation) was used for the measurement of the emission spectrum.
- the dehydrated acetone solution of Li-6mq had an absorption peak at 390 nm, and the emission wavelength peak was 540 nm (excitation wavelength 385 nm).
- 5-Di-tert-butylphenyl) -1,3,5-triazine (abbreviation: mmtBumBP-dmmtBuPTzn) will be described.
- the structure of mmtBumBP-dmmtBuPTzhn is shown below.
- Step 1 Synthesis of 3-bromo-3', 5'-di-tert-butylbiphenyl> 1.0 g (4.3 mmol) of 3,5-di-tert-butylphenylboronic acid, 1.5 g (5.2 mmol) of 1-bromo-3-iodobenzene in a three-necked flask, 4.5 mL of a 2 mol / L potassium carbonate aqueous solution , 20 mL of toluene and 3 mL of ethanol were added, and the mixture was degassed by stirring under reduced pressure.
- step 1 tris (2-methylphenyl) phosphine (abbreviation: P (o-tolyl) 3 ) 52 mg (0.17 mmol), palladium (II) acetate (abbreviation: Pd (OAc) 2 ) 10 mg (0.043 mmol) was added.
- P (o-tolyl) 3 tris (2-methylphenyl) phosphine
- Pd (OAc) 2 ) 10 mg (0.043 mmol) was added.
- the reaction was carried out at 80 ° C. for 14 hours under a nitrogen atmosphere. After completion of the reaction, extraction with toluene was performed, and the obtained organic layer was dried over magnesium sulfate. This mixture was naturally filtered, and the obtained filtrate was purified by silica gel column chromatography (developing solvent: hexane) to obtain 1.0 g of the desired white solid (yield: 68%).
- the synthesis scheme of step 1 is shown below.
- Step 2 Synthesis of 2- (3', 5'-di-tert-butylbiphenyl-3-yl) -4,4,5,5,-tetramethyl-1,3,2-dioxaborolane>
- 30 mL of 1,4-dioxane was added, and the mixture was degassed by stirring under reduced pressure.
- 2-dicyclohexylphosphino-2', 6'-dimethoxybiphenyl (abbreviation: SPhos) 0.12 g (0.30 mmol)
- [1,1'-bis (diphenylphosphino) ferrocene] palladium (II) dichloride 0.12 g (0.15 mmol) of a dichloromethane adduct (abbreviation: Pd (dppf) 2 Cl 2 ⁇ CH 2 Cl 2 ) was added, and the mixture was reacted at 110 ° C. for 24 hours under a nitrogen atmosphere. After completion of the reaction, extraction with toluene was performed, and the obtained organic layer was dried over magnesium sulfate.
- step 2 The synthesis scheme of step 2 is shown below.
- Step 3 Synthesis of mmtBumBP-dmmtBuPTzh> 4,6-bis (3,5-di-tert-butyl-phenyl) -2-chloro-1,3,5-triazine 0.8 g (1.6 mmol), 2- (3', 5') in a three-necked flask -Di-tert-butylbiphenyl-3-yl) -4,4,5,5-tetramethyl-1,3,2-dioxaborolane 0.89 g (2.3 mmol), tripotassium phosphate 0.68 g (3.
- the obtained solid was recrystallized from hexane to obtain 0.88 g (yield: 76%) of the desired white solid.
- the synthesis scheme of step 3 is shown below.
- FIG. 15 shows the results of measuring the refractive index of mmtBumBP-dmmtBuPTzh obtained by the above-mentioned synthesis method using a spectroscopic ellipsometer (M-2000U manufactured by JA Woolam Japan Co., Ltd.). For the measurement, a film in which the material of each layer was formed on a quartz substrate by a vacuum vapor deposition method at about 50 nm was used. Note that FIG. 15 shows n, Ordinary, which is the refractive index of ordinary light rays, and n, Extra-ordinary, which is the refractive index of abnormal light rays.
- mmtBumBP-dmmtBuPTzhn has an ordinary light refractive index in the range of 1.50 or more and 1.75 or less in the entire blue light emitting region (455 nm or more and 465 nm or less), and an ordinary light refractive index of 1.45 or more for 633 nm. It was found that the material was in the range of 70 or less and had a low refractive index.
- Structural formula (202) 2- (3,3'', 5,5''-tetra-tert-butyl-1,1': 3', 1''-phenyl-5'-yl) -4,6- Diphenyl-1,3,5-triazine (abbreviation: mmtBumTPTzn) 1 1 H NMR (CDCl 3,300 MHz): ⁇ 1.44 (s, 36H), 7.54-7.62 (m, 12H), 7.99 (t, 1H), 8.79 (d, 4H) , 8.92 (d, 2H).
- All of the above organic compounds have an ordinary light refractive index of 1.50 or more and 1.75 or less in the blue light emitting region (455 nm or more and 465 nm or less), or an ordinary light refractive index with respect to light of 633 nm which is usually used for measuring the refractive index. It is an organic compound of 45 or more and 1.70 or less.
- the H 3 O 40 PW 12 contained in the sample 1 is a heteropolyacid, and the DPA contained in the sample 1 is a secondary amine compound. That is, the sample 1 has a mixed film of a heteropolyacid and a secondary amine.
- FIG. 18 shows the results of ESR measurement of sample 1, comparative sample 1, and comparative sample 2.
- FIG. 18 shows the ESR spectra of sample 1, comparative sample 1, and comparative sample 2.
- the horizontal axis is the g value
- the vertical axis is the spin intensity (Intensity) [a. u. ].
- the ESR spectrum was measured using an electron spin resonance measuring device JES FA300 (manufactured by JEOL Ltd.). The above measurement was performed at resonance frequency (about 9.2 GHz), output (1 mW), modulation magnetic field (50 mT), modulation width (0.5 mT), time constant (0.03 sec), sweep time (4 min), and room temperature. went. Then, the magnetic field was corrected according to the positions of Mn 2 + 3rd and 4th signals.
- the mixed film and the mixture of the heteropolyacid and the secondary amine according to one aspect of the present invention have a significantly increased spin density having a g value of about 2.00 as compared with the unmixed one. rice field. Therefore, it is presumed that carriers have been generated. Therefore, it was suggested that when the mixed membrane of the heteropolyacid and the secondary amine of one aspect of the present invention is used for the hole injection layer, a device having good hole injection property can be obtained. Further, the hole injection layer having a mixed film of a heteropolyacid and a secondary amine has a signal having a g value of about 2.00 as measured by an electron spin resonance spectrum by the ESR method.
- the ultraviolet-visible absorption spectrum of sample 1 is shown in FIG. 19, the ultraviolet-visible absorption spectrum of comparative sample 1 is shown in FIG. 20, and the ultraviolet-visible absorption spectrum of comparative sample 2 is shown in FIG. 21.
- the horizontal axis is the wavelength (nm) and the vertical axis is the absorbance.
- the small peak near 900 nm that appears in the ultraviolet-visible absorption spectra of Sample 1, Comparative Sample 1, and Comparative Sample 2 is a spectral disturbance due to the switching of the light source of the measuring device.
- the mixed film and mixture of the heteropolyacid and the secondary amine according to one aspect of the present invention have a new intramolecular interaction in the range of 400 nm to 1500 nm as compared with the unmixed one. It was found that the absorption derived from the charge transfer transition) was significantly increased. This also correlates with the increase in ESR spin density. Therefore, it is presumed that carriers have been generated. Therefore, it was suggested that when the mixed membrane of the heteropolyacid and the secondary amine of one aspect of the present invention is used for the hole injection layer, a device having good hole injection property can be obtained. Further, the hole injection layer having a mixed film of a heteropolyacid and a secondary amine has an absorption in which a peak is located at 400 nm or more and 1500 nm or less as measured by an ultraviolet-visible absorption spectrum.
- Electrode 101: Electrode, 102: Electrode, 103: EL layer, 111: Hole injection layer, 112: Hole transport layer, 113: Light emitting layer, 114: Electron transport layer, 115: Electron injection layer, 116: Charge generation layer, 117: P-type layer, 118: electron relay layer, 119: electron injection buffer layer, 120: hole transport region, 121: electron transport region, 400: substrate, 401: anode, 403: EL layer, 404: cathode, 405.
- Sealing material 406: Sealing material, 407: Sealing substrate, 412: Pad, 420: IC chip, 601: Drive circuit section (source line drive circuit), 602: Pixel section, 603: Drive circuit section (gate wire drive) Circuit), 604: Encapsulating substrate, 605: Sealing material, 607: Space, 608: Wiring, 609: FPC (Flexible printed circuit), 610: Element substrate, 611: Switching FET, 612: Current control FET, 613 : Abox, 614: Insulant, 616: EL layer, 617: Cathode, 618: Light emitting device, 623: FET, 730: Insulating film, 770: Flattening insulating film, 772: Conductive film, 782: Light emitting element, 783: Droplet ejection device, 784: droplet, 785: layer, 786: layer, 788: conductive film, 951: substrate, 952: electrode, 953: insulating layer, 954: partition
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Abstract
Description
図2Aおよび図2Bはアクティブマトリクス型発光装置を表す図である。
図3Aおよび図3Bはアクティブマトリクス型発光装置を表す図である。
図4はアクティブマトリクス型発光装置を表す図である。
図5Aおよび図5Bはパッシブマトリクス型発光装置を表す図である。
図6Aおよび図6Bは照明装置を表す図である。
図7A、図7B1、図7B2および図7Cは電子機器を表す図である。
図8A乃至図8Cは電子機器を表す図である。
図9は照明装置を表す図である。
図10は照明装置を表す図である。
図11は車載表示装置及び照明装置を表す図である。
図12Aおよび図12Bは電子機器を表す図である。
図13A乃至図13Cは電子機器を表す図である。
図14はLi−6mqの脱水アセトン溶液における吸収スペクトルおよび発光スペクトルである。
図15はmmtBumBPTznの屈折率を測定したデータである。
図16A乃至図16Dは発光デバイスの作製方法の一例を表す図である。
図17は液滴吐出装置を説明する概念図である。
図18は、試料1、比較試料1、及び比較試料2のESRスペクトルを説明する図である。
図19は、試料1の紫外可視吸収スペクトルを説明する図である。
図20は、比較試料1の紫外可視吸収スペクトルを説明する図である。
図21は、比較試料2の紫外可視吸収スペクトルを説明する図である。
図1Aに、本発明の一態様の発光デバイスを表す図を示す。本発明の一態様の発光デバイスは、陽極101と、陰極102と、EL層103とを有し、当該EL層103は、正孔輸送領域120と、発光層113と、電子輸送領域121と、を有している。
本実施の形態では、実施の形態1に記載の発光デバイスを用いた発光装置について説明する。
本実施の形態では、実施の形態1に記載の発光デバイスを照明装置として用いる例を、図6を参照しながら、説明する。図6Bは照明装置の上面図、図6Aは図6Bに示す線分e−fにおける断面図である。
本実施の形態では、実施の形態1に記載の発光デバイスをその一部に含む電子機器の例について説明する。実施の形態1に記載の発光デバイスは発光効率が良好であり、消費電力の小さい発光デバイスである。その結果、本実施の形態に記載の電子機器は、消費電力が小さい発光部を有する電子機器とすることが可能である。
本実施例では、実施の形態1で説明した6−メチル−8−キノリノラト−リチウム(略称:Li−6mq)の合成方法について説明する。Li−6mqの構造式を以下に示す。
実施の形態1で説明した低屈折率電子輸送性材料の合成方法の一例を以下に示す。
三口フラスコに3,5−ジ−tert−ブチルフェニルボロン酸1.0g(4.3mmol)、1−ブロモ−3−ヨードベンゼン1.5g(5.2mmol)、2mol/L炭酸カリウム水溶液4.5mL、トルエン20mL、エタノール3mLを加え、減圧下で撹拌することにより脱気した。さらにここへトリス(2−メチルフェニル)ホスフィン(略称:P(o−tolyl)3)52mg(0.17mmol)、酢酸パラジウム(II)(略称:Pd(OAc)2)10mg(0.043mmol)を加え、窒素雰囲気下、80℃で14時間反応させた。反応終了後、トルエンによる抽出を行い、得られた有機層を硫酸マグネシウムで乾燥させた。この混合物を自然ろ過し、得られたろ液をシリカゲルカラムクロマトグラフィー(展開溶媒:ヘキサン)にて精製することにより目的の白色固体1.0gを得た(収率:68%)。ステップ1の合成スキームを以下に示す。
三口フラスコに3−ブロモ−3’,5’−ジ−tert−ブチルビフェニル1.0g(2.9mmol)、ビス(ピナコレート)ジボロン0.96g(3.8mmol)、酢酸カリウム0.94g(9.6mmol)、1,4−ジオキサン30mLを加え、減圧下で撹拌することにより脱気した。さらにここに2−ジシクロヘキシルホスフィノ−2’,6’−ジメトキシビフェニル(略称:SPhos)0.12g(0.30mmol)、[1,1’−ビス(ジフェニルホスフィノ)フェロセン]パラジウム(II)ジクロリド ジクロロメタン付加物(略称:Pd(dppf)2Cl2・CH2Cl2)0.12g(0.15mmol)を加え、窒素雰囲気下、110℃で24時間反応させた。反応終了後、トルエンによる抽出をおこない、得られた有機層を硫酸マグネシウムにて乾燥させた。この混合物を自然ろ過した。得られたろ液をシリカゲルカラムクロマトグラフィー(展開溶媒:トルエン)にて精製することにより、目的の黄色オイル0.89gを得た(収率:78%)。ステップ2の合成スキームを以下に示す。
三口フラスコに4,6−ビス(3,5−ジ−tert−ブチル−フェニル)−2−クロロ−1,3,5−トリアジン0.8g(1.6mmol)、2−(3’,5’−ジ−tert−ブチルビフェニル−3−イル)−4,4,5,5−テトラメチル−1,3,2−ジオキサボロラン0.89g(2.3mmol)、リン酸三カリウム0.68g(3.2mmol)、水3mL、トルエン8mL、1,4−ジオキサン3mLを加え、減圧下で撹拌することにより脱気した。さらにここに酢酸パラジウム(II)3.5mg(0.016mmol)、トリス(2−メチルフェニル)ホスフィン10mg(0.032mmol)を加え、窒素雰囲気下12時間加熱還流した。反応終了後、酢酸エチルによる抽出を行い、得られた有機層を硫酸マグネシウムにて乾燥させた。この混合物を自然ろ過した。得られたろ液を濃縮し、シリカゲルカラムクロマトグラフィー(展開溶媒 酢酸エチル:ヘキサン=1:20)にて精製し、固体を得た。この固体をシリカゲルカラムクロマトグラフィー(展開溶媒 クロロホルム:ヘキサン=5:1から1:0に変化させた)にて精製した。得られた固体をヘキサンにて再結晶することにより、目的の白色固体0.88g(収率:76%)を得た。ステップ3の合成スキームを以下に示す。
1H NMR(CDCl3,300MHz):δ=1.44(s,18H),7.51−7.68(m,10H),7.83(d,1H),8.73−8.81(m,5H),9.01(s,1H)。
1H NMR(CDCl3,300MHz):δ=1.44(s,36H),7.54−7.62(m,12H),7.99(t,1H),8.79(d,4H),8.92(d,2H)。
1H NMR(CDCl3,300MHz):δ=1.39−1.45(m,54H),7.47(t,1H),7.59−7.65(m,5H),7.76(d,1H),7.95(s,1H),8.06(d,4H),8.73(d,1H、8.99(s,1H))。
1H NMR(CDCl3,300MHz):δ=1.41(s,18H),1.49(s,9H),1.52(s,9H),7.49(s,3H),7.58−7.63(m,7H),7.69−7.70(m,2H),7.88(t,1H),8.77−8.83(m,6H)。
12タングスト(VI)りん酸n水和物(略称:H3O40PW12、富士フイルム和光純薬株式会社製)と4−ジフェニルアミノジフェニルアミン(DPA)を1mol:8molの割合で、N,N−ジメチルホルムアミド(DMF)に溶かした。得られた溶液を石英基板上に滴下して成膜した。得られた成膜基板を約150℃のホットプレート上にて乾燥させ、試料1を得た。
H3O40PW12をDMFに溶かした。得られた溶液を石英基板上に滴下して成膜した。得られた成膜基板を約150℃のホットプレート上にて乾燥させ、比較試料1を得た。
DPAをDMFに溶かした。得られた溶液を石英基板上に滴下して成膜した。得られた成膜基板を約150℃のホットプレート上にて乾燥させ、比較試料2を得た。
Claims (33)
- 陽極と、
陰極と、
前記陽極と前記陰極の間に位置するEL層とを有し、
前記EL層は、正孔輸送領域と、発光層と、電子輸送領域とを有し、
前記正孔輸送領域は、前記陽極と前記発光層との間に位置し、
前記電子輸送領域は、前記陰極と前記発光層との間に位置し、
前記正孔輸送領域は、ヘテロポリ酸が含まれるワニスを塗布および焼成することによって形成された層を有し、
前記電子輸送領域は、電子輸送性を有する有機化合物を有し、
前記電子輸送性を有する有機化合物の、波長455nm以上465nm以下の光における常光屈折率が、1.50以上1.75以下である発光デバイス。 - 陽極と、
陰極と、
前記陽極と前記陰極の間に位置するEL層とを有し、
前記EL層は、正孔輸送領域と、発光層と、電子輸送領域とを有し、
前記正孔輸送領域は、前記陽極と前記発光層との間に位置し、
前記電子輸送領域は、前記陰極と前記発光層との間に位置し、
前記正孔輸送領域は、ヘテロポリ酸が含まれるワニスを塗布および焼成することによって形成された層を有し、
前記電子輸送領域は、電子輸送性を有する有機化合物を有し、
前記電子輸送性を有する有機化合物の、波長633nmの光に対する常光屈折率が、1.45以上1.70以下である発光デバイス。 - 請求項1または請求項2において、
前記正孔輸送領域が、前記ヘテロポリ酸及びπ電子過剰型芳香環を有する有機化合物、または前記ヘテロポリ酸及びπ電子過剰型複素芳香環を有する有機化合物が含まれるワニスを塗布および焼成することによって形成された層を有する発光デバイス。 - 請求項3において、
前記π電子過剰型芳香環を有する有機化合物及び前記π電子過剰型複素芳香環を有する有機化合物が、アリールアミンである発光デバイス。 - 陽極と、
陰極と、
前記陽極と前記陰極との間に位置するEL層とを有し、
前記EL層は、正孔輸送領域と、発光層と、電子輸送領域とを有し、
前記正孔輸送領域は前記陽極と前記発光層との間に位置し、
前記電子輸送領域は前記陰極と前記発光層との間に位置し、
前記正孔輸送領域は、ヘテロポリ酸を有し、
前記電子輸送領域は、電子輸送性を有する有機化合物を有し、
前記電子輸送性を有する有機化合物は、波長455nm以上465nm以下の光における常光屈折率が、1.50以上1.75以下である発光デバイス。 - 陽極と、
陰極と、
前記陽極と前記陰極との間に位置するEL層とを有し、
前記EL層は、正孔輸送領域と、発光層と、電子輸送領域とを有し、
前記正孔輸送領域は前記陽極と前記発光層との間に位置し、
前記電子輸送領域は前記陰極と前記発光層との間に位置し、
前記正孔輸送領域は、ヘテロポリ酸を有し、
前記電子輸送領域は、電子輸送性を有する有機化合物を有し、
前記電子輸送性を有する有機化合物の、波長633nmの光に対する常光屈折率が、1.45以上1.70以下である発光デバイス。 - 請求項5または請求項6において、
前記正孔輸送領域が、前記ヘテロポリ酸及びπ電子過剰型芳香環を有する有機化合物、または前記ヘテロポリ酸及びπ電子過剰型複素芳香環を有する有機化合物を含む発光デバイス。 - 請求項7において、
前記π電子過剰型芳香環を有する有機化合物及び前記π電子過剰型複素芳香環を有する有機化合物が、アリールアミンである発光デバイス。 - 請求項5または請求項6において、
前記正孔輸送領域が、前記ヘテロポリ酸及び三級アミンを含む発光デバイス。 - 請求項1乃至請求項9のいずれか一項において、
前記ヘテロポリ酸が、リンタングステン酸である発光デバイス。 - 請求項1乃至請求項10のいずれか一項において、
前記正孔輸送領域が、アリールスルホン酸を含む発光デバイス。 - 請求項1乃至請求項11のいずれか一項において、
前記正孔輸送領域が、正孔輸送層と、正孔注入層とを有し、
前記正孔注入層が、前記陽極に接して設けられ、
前記正孔注入層が、前記ヘテロポリ酸及び二級アミンを含む発光デバイス。 - 請求項12において、
前記正孔注入層が、ESR法による電子スピン共鳴スペクトルの測定で、g値が約2.00にシグナルを有する発光デバイス。 - 請求項12または請求項13において、
前記正孔注入層が、紫外可視吸収スペクトルの測定で、400nm以上1500nm以下にピークが位置する吸収を有する発光デバイス。 - 請求項1乃至請求項14のいずれか一項において、
前記発光層が、イリジウム錯体を含む発光デバイス。 - 請求項15において、
前記イリジウム錯体が、緑色のりん光を呈する発光デバイス。 - 請求項15または請求項16において、
前記発光層が、ToF−SIMSによるポジティブモードの測定で、m/z=1676付近にシグナルを有する発光デバイス。 - 請求項1乃至請求項18のいずれか一項において、
前記電子輸送性を有する有機化合物が、窒素を含む6員環の複素芳香環を少なくとも一つと、ベンゼン環を二つと、一つまたは複数の炭素数6乃至14の芳香族炭化水素環と、複数のsp3混成軌道で結合を形成している炭化水素基と、を有し、
前記sp3混成軌道で結合を形成している炭素の総数が、前記電子輸送性を有する有機化合物の分子内の総炭素数の10%以上60%以下である発光デバイス。 - 請求項1乃至請求項19のいずれか一項において、
前記電子輸送領域が、電子輸送層と、電子注入層とを有し、
前記電子注入層が、前記陰極に接して設けられ、
前記電子輸送層が、前記電子輸送性を有する有機化合物を含む発光デバイス。 - 請求項20において、
前記電子輸送層が、アルカリ金属またはアルカリ土類金属の金属錯体を含む発光デバイス。 - 請求項21において、
前記アルカリ金属またはアルカリ土類金属の金属錯体が、8−キノリノラト構造を含む配位子を有する発光デバイス。 - 請求項21または請求項22において、
前記アルカリ金属またはアルカリ土類金属の金属錯体が、リチウムの金属錯体である発光デバイス。 - 請求項20乃至請求項23のいずれか一項において、
前記電子注入層が、ToF−SIMSによるポジティブモードまたはネガティブモードの測定で、m/z=587付近にシグナルを有する発光デバイス。 - 請求項20乃至請求項24のいずれか一項において、
前記電子注入層が、複素芳香族化合物を含む発光デバイス。 - 請求項25において、
前記複素芳香族化合物が、2−フェニル−9−[3−(9−フェニル−1,10−フェナントロリン−2−イル)フェニル]−1,10−フェナントロリンである発光デバイス。 - 請求項20乃至請求項26のいずれか一項において、
前記電子注入層が、フッ素と、ナトリウムと、を含む発光デバイス。 - 請求項20乃至請求項27のいずれか一項において、
前記電子注入層が、バリウムを含む発光デバイス。 - 請求項1乃至請求項28のいずれか一項に記載の発光デバイスを複数有し、
前記複数の発光デバイスが、少なくとも赤色に発光する発光デバイスと、緑色に発光する発光デバイスとを含み、
前記赤色に発光する発光デバイスの発光層、および前記緑色に発光する発光デバイスの発光層が、イリジウムを含む発光装置。 - 請求項29において、
前記赤色に発光する発光デバイスおよび前記緑色に発光する発光デバイス、のそれぞれから得られる光が、いずれもりん光である発光装置。 - 請求項29または請求項30において、
前記複数の発光デバイスが、青色に発光する発光デバイスを含み、
前記青色に発光する発光デバイスから得られる光が蛍光である発光装置。 - 請求項1乃至請求項28のいずれか一項に記載の発光デバイスを複数有する発光装置。
- 請求項29乃至請求項32のいずれか一項に記載の発光装置を備えた表示装置。
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