Patents by Inventor Nobuharu Ohsawa
Nobuharu Ohsawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 12225812Abstract: An organic compound having a hole-transport property and a low refractive index is provided. An organic compound represented by General Formula (G1) shown below is provided. In General Formula (G1), Ar1 represents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms in a ring, n represents an integer of 0 or 1, and Ar2 represents an aryl group having 6 to 10 carbon atoms in a ring and includes at least one branched-chain or cyclic alkyl group having 3 to 12 carbon atoms. The total number of carbon atoms of the branched-chain or cyclic alkyl group in Ar2 is more than or equal to 6. R1 to R4 each independently represent an alkyl group having 1 to 6 carbon atoms. R11 to R14 and R21 to R24 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Any one of R15 to R18 and any one of R25 to R28 each represent a bond directly bonded to a nitrogen atom, and the others each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.Type: GrantFiled: March 16, 2022Date of Patent: February 11, 2025Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Tomohiro Kubota, Takao Tosu, Takeyoshi Watabe, Airi Ueda, Yuta Kawano, Nobuharu Ohsawa, Satoshi Seo
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Publication number: 20250034177Abstract: An organic compound having high heat resistance is provided. An organic compound represented by a general formula (G1) is provided. In the formula, Q represents carbon or silicon; each of R1 and R2 independently represents an alkyl group, a cycloalkyl group, or an aryl group; n represents an integer from 1 to 3; each of ?1 to ?4 independently represents a phenylene group or a biphenylene group; at least one of R15, R25, R31 and at least one of R45, R55, and R61 represent single bonds and the others thereof represent H, an alkyl group, or an aryl group; and R11 to R14, R21 to R24, R32 to R35, R41 to R44, R51 to R54, and R62 to R65 represent H, an alkyl group, a cycloalkyl group, or an aryl group.Type: ApplicationFiled: July 3, 2024Publication date: January 30, 2025Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Harue OSAKA, Satoko NUMATA, Nobuharu OHSAWA, Yuko KUBOTA, Kyoko TAKEDA, Hiromitsu KIDO
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Publication number: 20250040430Abstract: A novel light-emitting device, a light-emitting device with high emission efficiency, a light-emitting device with a long lifetime, or a light-emitting device with low driving voltage is provided. An EL layer includes a first layer, a second layer, a third layer, a light-emitting layer, and a fourth layer in this order from the anode side. The first layer contains a first organic compound and a second organic compound. The fourth layer contains a seventh organic compound. The first organic compound exhibits an electron-accepting property with respect to the second organic compound. A HOMO level of the second organic compound is higher than or equal to ?5.7 eV and lower than or equal to ?5.4 eV. The fourth layer includes a region where the amount of seventh organic compound is large and a region where the amount of seventh organic compound is small in the thickness direction.Type: ApplicationFiled: September 17, 2024Publication date: January 30, 2025Inventors: Naoaki HASHIMOTO, Satoshi SEO, Tsunenori SUZUKI, Yusuke TAKITA, Takumu OKUYAMA, Nobuharu OHSAWA, Shunpei YAMAZAKI, Toshiki SASAKI
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Publication number: 20250031515Abstract: A light-emitting device, an electronic device, and a display device each consume less power are provided. The light-emitting device includes a first light-emitting element, a second light-emitting element, and a third light-emitting element that share an EL layer. The EL layer includes a layer containing a light-emitting material that emits blue fluorescence and a layer containing a light-emitting material that emits yellow or green phosphorescence. Light emitted from the second light-emitting element enters a color filter layer or a second color conversion layer, and light emitted from the third light-emitting element enters a first color conversion layer.Type: ApplicationFiled: October 2, 2024Publication date: January 23, 2025Inventors: Satoshi SEO, Nobuharu OHSAWA
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Publication number: 20250024741Abstract: A light-emitting apparatus with high emission efficiency is provided. A light-emitting apparatus including a light-emitting device A and a light-emitting device B is provided. The light-emitting device A includes a first electrode A, a second electrode A, a light-emitting layer A interposed between the first electrode A and the second electrode A, and a first layer A interposed between the first electrode A and the light-emitting layer A. The light-emitting device B includes a first electrode B, a second electrode B, a light-emitting layer B interposed between the first electrode B and the second electrode B, a first layer B interposed between the first electrode B and the light-emitting layer B, and a second layer B interposed between the first electrode B and the light-emitting layer B. The light-emitting layer A contains a light-emitting substance A. The light-emitting layer B contains a light-emitting substance B.Type: ApplicationFiled: November 16, 2022Publication date: January 16, 2025Inventors: Takeyoshi WATABE, Nobuharu OHSAWA, Satoshi SEO
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Publication number: 20250024697Abstract: An object of one embodiment of the present invention is to provide a multicolor light-emitting element that utilizes fluorescence and phosphorescence and is advantageous for practical application. The light-emitting element has a stacked-layer structure of a first light-emitting layer containing a host material and a fluorescent substance, a separation layer containing a substance having a hole-transport property and a substance having an electron-transport property, and a second light-emitting layer containing two kinds of organic compounds that form an exciplex and a substance that can convert triplet excitation energy into luminescence. Note that a light-emitting element in which light emitted from the first light-emitting layer has an emission spectrum peak on the shorter wavelength side than an emission spectrum peak of the second light-emitting layer is more effective.Type: ApplicationFiled: July 19, 2024Publication date: January 16, 2025Inventors: Nobuharu OHSAWA, Yusuke NONAKA, Takahiro ISHISONE, Satoshi SEO, Takuya KAWATA
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Patent number: 12200952Abstract: A long-lifetime light-emitting device is provided. The light-emitting apparatus includes a first light-emitting device and a first color conversion layer. The first color conversion layer contains a first substance. An EL layer of the first light-emitting device includes a first layer, a second layer, a third layer, a light-emitting layer, and a fourth layer in this order from the anode side. The first layer contains a first organic compound and a second organic compound. The second layer contains a third organic compound. The third layer contains a fourth organic compound. The light-emitting layer contains a fifth organic compound and a sixth organic compound. The fourth layer contains a seventh organic compound. The first organic compound is an organic compound having an electron accepting property to the second organic compound. The fifth organic compound is an emission center substance. The HOMO level of the second organic compound is higher than or equal to ?5.7 eV and lower than or equal to ?5.4 eV.Type: GrantFiled: January 31, 2020Date of Patent: January 14, 2025Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Nobuharu Ohsawa, Shunpei Yamazaki
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Publication number: 20250017104Abstract: A novel display apparatus that is highly convenient, useful, or reliable is provided. The display apparatus includes a first light-emitting device and a second light-emitting device. A gap is provided between the second light-emitting device and the first light-emitting device. The first light-emitting device includes a first pixel electrode, a common electrode, and a first unit. The first unit is sandwiched between the first pixel electrode and the common electrode and contains a first organic compound L. The first organic compound L includes a plurality of 2,2?-bipyridine skeletons or a plurality of 1,10?-phenanthroline skeletons. The second light-emitting device includes a second pixel electrode, the common electrode, and a third unit. The third unit is sandwiched between the second pixel electrode and the common electrode. The third unit contains the first organic compound L. A gap is provided between the third unit and the first unit.Type: ApplicationFiled: November 17, 2022Publication date: January 9, 2025Inventors: Nobuharu OHSAWA, Toshiki SASAKI, Naoaki HASHIMOTO
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Publication number: 20250017035Abstract: An object is to provide a light-emitting element with high emission efficiency. The light-emitting element contains first to third organic compounds. The first organic compound has a function of converting triplet excitation energy into light. The second organic compound has a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton. The third organic compound is a fluorescent compound. Light emitted from the light-emitting element is light emitted from the third organic compound that receives excitation energy from the first organic compound or from an exciplex formed by the first and second organic compounds.Type: ApplicationFiled: July 19, 2024Publication date: January 9, 2025Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Nobuharu OHSAWA, Satoshi Seo
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Publication number: 20250017036Abstract: A light-emitting device that can be used in a high-resolution display apparatus and has a low driving voltage and high current efficiency is provided. A tandem light-emitting device is fabricated through a photolithography process and includes a plurality of light-emitting units and an intermediate layer therebetween. The intermediate layer includes a layer that includes a metal oxide and an organic compound having a phenanthroline ring with an electron-donating group. The layer of the intermediate layer is in contact with a light-emitting unit on the anode side.Type: ApplicationFiled: June 27, 2024Publication date: January 9, 2025Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Toshiki SASAKI, Nobuharu OHSAWA, Hiromi SEO, Shinya FUKUZAKI
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Patent number: 12178119Abstract: A light-emitting device with high emission efficiency and high reliability is provided. The light-emitting device includes a host material and a guest material in a light-emitting layer. The host material has a function of converting triplet excitation energy into light emission and the guest material emits fluorescence. The guest material has a molecular structure including a luminophore and protecting groups, and five or more protecting groups are included in one molecule of the guest materials. When the protecting groups are introduced into the molecule, triplet excitation energy transfer from the host material to the guest material by the Dexter mechanism is inhibited. As the protecting group, an alkyl group or a branched-chain alkyl group is used. A light-emitting device with improved emission efficiency can be obtained with the use of a material having a five-membered ring skeleton in the host material.Type: GrantFiled: October 28, 2019Date of Patent: December 24, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Nobuharu Ohsawa, Satoshi Seo
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Publication number: 20240423005Abstract: A novel light-emitting device is provided. Alternatively, a light-emitting device with high emission efficiency is provided. Alternatively, a light-emitting device having a long lifetime is provided. Alternatively, a light-emitting device having low driving voltage is provided. A light-emitting device including an EL layer including a first layer, a second layer, a third layer, a light-emitting layer, and a fourth layer in this order from the anode side is provided. The first layer includes a first organic compound and a second organic compound. The fourth layer includes a seventh organic compound. The first organic compound exhibits an electron-accepting property with respect to the second organic compound. The HOMO level of the second organic compound is from ?5.7 eV to ?5.4 eV. The HOMO level of the seventh organic compound is ?6.0 eV or higher.Type: ApplicationFiled: August 26, 2024Publication date: December 19, 2024Inventors: Satoshi SEO, Tsunenori SUZUKI, Takumu OKUYAMA, Yusuke TAKITA, Naoaki HASHIMOTO, Hiromi SEO, Nobuharu OHSAWA, Toshiki SASAKI, Shunpei YAMAZAKI
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Patent number: 12170337Abstract: The transistor includes a first gate electrode, a first insulating film over the first gate electrode, an oxide semiconductor film over the first insulating film, a source electrode over the oxide semiconductor film, a drain electrode over the oxide semiconductor film, a second insulating film over the oxide semiconductor film, the source electrode, and the drain electrode, and a second gate electrode over the second insulating film. The first insulating film includes a first opening. A connection electrode electrically connected to the first gate electrode through the first opening is formed over the first insulating film. The second insulating film includes a second opening that reaches the connection electrode. The second gate electrode includes an oxide conductive film and a metal film over the oxide conductive film. The connection electrode and the second gate electrode are electrically connected to each other through the metal film.Type: GrantFiled: April 12, 2023Date of Patent: December 17, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Yoshiaki Oikawa, Nobuharu Ohsawa, Masami Jintyou, Yasutaka Nakazawa
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Patent number: 12171127Abstract: A multicolor light-emitting element that utilizes fluorescence and phosphorescence and is advantageous for practical application is provided. The light-emitting element has a stacked-layer structure of a first light-emitting layer containing a host material and a fluorescent substance and a second light-emitting layer containing two kinds of organic compounds and a substance that can convert triplet excitation energy into luminescence. Note that light emitted from the first light-emitting layer has an emission peak on the shorter wavelength side than light emitted from the second light-emitting layer.Type: GrantFiled: November 15, 2023Date of Patent: December 17, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Takahiro Ishisone, Satoshi Seo, Yusuke Nonaka, Nobuharu Ohsawa
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Publication number: 20240414987Abstract: A light-emitting apparatus including a first light-emitting device and a second light-emitting device is provided. The first light-emitting device includes a first electrode, a second electrode, a first light-emitting layer positioned between the first electrode and the second electrode, a first layer positioned between the first electrode and the first light-emitting layer, and a second layer positioned between the first layer and the first light-emitting layer. The second light-emitting device includes a third electrode, a fourth electrode, a second light-emitting layer positioned between the third electrode and the fourth electrode, a third layer positioned between the third electrode and the second light-emitting layer, a fourth layer positioned between the third layer and the second light-emitting layer, and a fifth layer positioned between the third electrode and the second light-emitting layer. The first light-emitting layer includes a first light-emitting substance.Type: ApplicationFiled: October 3, 2022Publication date: December 12, 2024Applicant: Semiconductor Energy Labratory Co., Ltd.Inventors: Takeyoshi WATABE, Nobuharu OHSAWA, Satoshi SEO
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Publication number: 20240414988Abstract: A light-emitting apparatus with high emission efficiency is provided. A light-emitting apparatus including a light-emitting device A and a light-emitting device B is provided. The light-emitting device A includes a first electrode A, a second electrode A, a light-emitting layer A between the first electrode A and the second electrode A, and a first layer A between the first electrode A and the light-emitting layer A. The light-emitting device B includes a first electrode B, a second electrode B, a light-emitting layer B between the first electrode B and the second electrode B, a first layer B between the first electrode B and the light-emitting layer B, and a second layer B between the first electrode B and the light-emitting layer B. The light-emitting layer A contains a light-emitting substance A. The light-emitting layer B contains a light-emitting substance B. An emission peak wavelength of the light-emitting substance A is shorter than an emission peak wavelength of the light-emitting substance B.Type: ApplicationFiled: October 25, 2022Publication date: December 12, 2024Inventors: Takeyoshi WATABE, Nobuharu OHSAWA, Satoshi SEO
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Publication number: 20240414974Abstract: A light-emitting apparatus including a light-emitting device A and a light-emitting device B is provided. The light-emitting device A includes a first electrode A, a second electrode A, a light-emitting layer A interposed between the first electrode A and the second electrode A, a first layer A interposed between the first electrode A and the light-emitting layer A, and a second layer A interposed between the first layer A and the light-emitting layer A. The light-emitting device B includes a first electrode B, a second electrode B, a light-emitting layer B interposed between the first electrode B and the second electrode B, a first layer B interposed between the first electrode B and the light-emitting layer B, a second layer B positioned between the first layer B and the light-emitting layer B, and a third layer B interposed between the first electrode B and the light-emitting layer B. The light-emitting layer A contains a light-emitting substance A.Type: ApplicationFiled: September 20, 2022Publication date: December 12, 2024Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Takeyoshi WATABE, Nobuharu OHSAWA, Satoshi SEO
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Publication number: 20240397741Abstract: A display apparatus having a function of emitting visible light and infrared light and a light detection function is provided. The display apparatus includes a first light-emitting device, a second light-emitting device, and a light-receiving device in a display portion. The first light-emitting device emits both visible light and infrared light and the second light-emitting device emits visible light. The light-receiving device has a function of absorbing at least part of visible light and infrared light. The first light-emitting device includes a first pixel electrode, a first light-emitting layer, a second light-emitting layer, and a common electrode. The second light-emitting device includes a second pixel electrode, a third light-emitting layer, and the common electrode. The light-receiving device includes a third pixel electrode, an active layer, and the common electrode. The first light-emitting layer includes a light-emitting material emitting infrared light.Type: ApplicationFiled: August 1, 2024Publication date: November 28, 2024Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei YAMAZAKI, Daisuke KUBOTA, Nobuharu OHSAWA, Takeyoshi WATABE, Taisuke KAMADA
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Publication number: 20240397742Abstract: A light-emitting apparatus with high emission efficiency is provided. The light-emitting apparatus includes light-emitting devices A and B each including an anode, a cathode, and an EL layer. An EL layer A includes a first layer A to a third layer A and a light-emitting layer A. An EL layer B includes a first layer B to a fourth layer B and a light-emitting layer B. The light-emitting layer A includes a light-emitting substance A and the light-emitting layer B includes a light-emitting substance B. An emission peak wavelength (wavelength A) of the light-emitting substance A is shorter than an emission peak wavelength (wavelength B) of the light-emitting substance B. The first layers A and B have similar structures, the second layers A and B have similar structures, and the third layers A and B have similar structures. The ordinary refractive index (no) of each of the first layer A and the third layer A is lower than the no of the second layer A at the wavelength A.Type: ApplicationFiled: September 12, 2022Publication date: November 28, 2024Inventors: Takeyoshi WATABE, Nobuharu OHSAWA, Satoshi SEO
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Publication number: 20240389376Abstract: To provide a light-emitting device with favorable characteristics. A plurality of light-emitting devices are over one insulating surface. Each of the plurality of light-emitting devices includes a first electrode, a second electrode, and an organic compound layer between the first electrode and the second electrode. The first electrodes of the plurality of light-emitting devices are separate from each other. The second electrode is shared by the plurality of light-emitting devices. The organic compound layer includes a first light-emitting layer, a second light-emitting layer, and an intermediate layer between the first light-emitting layer and the second light-emitting layer. Contours of the first light-emitting layer, the intermediate layer, and the second light-emitting layer are aligned or substantially aligned with each other in each of the plurality of light-emitting devices. The intermediate layer includes a first layer.Type: ApplicationFiled: May 13, 2024Publication date: November 21, 2024Inventors: Toshiki SASAKI, Nobuharu OHSAWA, Hiromi SEO, Shinya FUKUZAKI