Patents by Inventor Satoshi Seo
Satoshi Seo 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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Publication number: 20240389377Abstract: A novel light-emitting device that is highly convenient, useful, or reliable is provided. The light-emitting device includes a first electrode, a second electrode, a first unit, and a first layer, and the first unit is held between the first electrode and the second electrode and includes a second layer, a third layer, and a fourth layer. The second layer is held between the third layer and the fourth layer, and the second layer contains a light-emitting material. The fourth layer is held between the second layer and the second electrode and contains a first organic compound. The first organic compound has a ?-electron deficient heteroaromatic ring skeleton and a ?-electron rich heteroaromatic ring skeleton and has a HOMO level higher than or equal to ?6.0 eV and lower than or equal to ?5.6 eV. The first layer is held between the first electrode and the first unit, is in contact with the first electrode, and contains a second organic compound and a third organic compound.Type: ApplicationFiled: April 28, 2022Publication date: November 21, 2024Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Naoaki HASHIMOTO, Satoshi SEO, Tsunenori SUZUKI, Hiromi SEO
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Publication number: 20240389373Abstract: Provided is a light-emitting element with high external quantum efficiency and a low drive voltage. The light-emitting element includes a light-emitting layer which contains a phosphorescent compound and a material exhibiting thermally activated delayed fluorescence between a pair of electrodes, wherein a peak of a fluorescence spectrum and/or a peak of a phosphorescence spectrum of the material exhibiting thermally activated delayed fluorescence overlap(s) with a lowest-energy-side absorption band in an absorption spectrum of the phosphorescent compound, and wherein the phosphorescent compound exhibits phosphorescence in the light-emitting layer by voltage application between the pair of electrodes.Type: ApplicationFiled: May 22, 2024Publication date: November 21, 2024Inventor: Satoshi SEO
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Patent number: 12145946Abstract: An object is to provide a novel composition for an EL device. Another object of one embodiment of the present invention is to provide a composition for an EL device capable of easily manufacturing an EL device with stable characteristics. Another object of one embodiment of the present invention is to provide a composition for an EL device capable of manufacturing an EL device with stable characteristics at low cost. The present inventors have studied a composition for an EL device in which different substances are mixed in advance and which does not cause change in characteristics of the EL device even when evaporation is repeated with use of the composition. As a result, a composition for an EL device in which a difference in the 5% weight loss temperature under a pressure lower than or equal to 0.1 Pa between contained substances is less than or equal to 50° C. is provided.Type: GrantFiled: November 20, 2019Date of Patent: November 19, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Nobuharu Ohsawa, Toshiki Sasaki, Hiromitsu Kido
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Patent number: 12150325Abstract: Provided is a light-emitting element with high external quantum efficiency, or a light-emitting element with a long lifetime. The light-emitting element includes, between a pair of electrodes, a light-emitting layer including a guest material and a host material, in which an emission spectrum of the host material overlaps with an absorption spectrum of the guest material, and phosphorescence is emitted by conversion of an excitation energy of the host material into an excitation energy of the guest material. By using the overlap between the emission spectrum of the host material and the absorption spectrum of the guest material, the energy smoothly transfers from the host material to the guest material, so that the energy transfer efficiency of the light-emitting element is high. Accordingly, a light-emitting element with high external quantum efficiency can be achieved.Type: GrantFiled: September 25, 2023Date of Patent: November 19, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoko Shitagaki, Satoshi Seo, Nobuharu Ohsawa, Hideko Inoue, Masahiro Takahashi, Kunihiko Suzuki
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Publication number: 20240381684Abstract: A light-emitting element having high emission efficiency is provided. The light-emitting element includes a first organic compound, a second organic compound, and a third organic compound. The first organic compound has a function of converting triplet excitation energy into light emission. The second organic compound is preferably a TADF material. The third organic compound is a fluorescent compound. Light emitted from the light-emitting element is obtained from the third organic compound. Triplet excitation energy in a light-emitting layer is transferred to the third organic compound by reverse intersystem crossing caused by the second organic compound or through the first organic compound.Type: ApplicationFiled: April 4, 2024Publication date: November 14, 2024Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Nobuharu OHSAWA, Satoshi Seo
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Patent number: 12139446Abstract: To provide a novel arylamine compound with a low refractive index. The provided arylamine compound includes at least one aromatic group. The aromatic group includes a first benzene ring, a second benzene ring, a third benzene ring, and at least three alkyl groups. The first benzene ring, the second benzene ring, and the third benzene ring are directly bonded in this order. The first benzene ring is bonded to nitrogen of amine. The first benzene ring may further include a substituted or unsubstituted phenyl group. The second benzene ring or the third benzene ring may further include an alkylated phenyl group. Each of first positions and third positions of two or more of the first to third benzene rings is independently bonded to another benzene ring, a benzene ring of the alkylated phenyl group, any of the at least three alkyl groups, or the nitrogen of the amine.Type: GrantFiled: March 26, 2021Date of Patent: November 12, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Nobuharu Ohsawa, Tomohiro Kubota, Takeyoshi Watabe, Airi Ueda, Yasushi Kitano, Takao Tosu
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Publication number: 20240373746Abstract: A triarylamine derivative represented by a general formula (G1) given below is provided. Note that in the formula, Ar represents either a substituted or unsubstituted phenyl group or a substituted or unsubstituted biphenyl group; ? represents a substituted or unsubstituted naphthyl group; ? represents either hydrogen or a substituted or unsubstituted naphthyl group; n and m each independently represent 1 or 2; and R1 to R8 each independently represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, or a phenyl group.Type: ApplicationFiled: May 2, 2024Publication date: November 7, 2024Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Harue OSAKA, Takahiro USHIKUBO, Nobuharu OHSAWA, Satoshi SEO, Tsunenori SUZUKI
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Publication number: 20240373748Abstract: A novel organic compound, a benzofuropyrimidine derivative or a benzothienopyrimidine derivative is provided. The organic compound has a structure in which a benzothienocarbazolyl ring, a benzofurocarbazolyl ring, an indolocarbazolyl ring, or an indenocarbazolyl ring is bonded to the 8-position of a benzofuropyrimidine ring or a benzothienopyrimidine ring directly or through an aromatic hydrocarbon ring. That is, the organic compound is represented by General Formula (G1) below.Type: ApplicationFiled: July 1, 2024Publication date: November 7, 2024Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Tomoka HARA, Keito TOSU, Hideko YOSHIZUMI, Toshiki SASAKI, Hiromitsu KIDO, Satoshi SEO
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Publication number: 20240365578Abstract: A light-emitting element which uses a plurality of kinds of light-emitting dopants emitting light in a balanced manner and has high emission efficiency is provided. Further, a light-emitting device, a display device, an electronic device, and a lighting device each having reduced power consumption by using the above light-emitting element are provided. A light-emitting element which includes a plurality of light-emitting layers including different phosphorescent materials is provided. In the light-emitting element, the light-emitting layer which includes a light-emitting material emitting light with a long wavelength includes two kinds of carrier-transport compounds having properties of transporting carriers with different polarities. Further, in the light-emitting element, the triplet excitation energy of a host material included in the light-emitting layer emitting light with a short wavelength is higher than the triplet excitation energy of at least one of the carrier-transport compounds.Type: ApplicationFiled: July 1, 2024Publication date: October 31, 2024Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi SEO, Takahiro ISHISONE
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Publication number: 20240357846Abstract: A novel light-emitting device is provided. Alternatively, a light-emitting device with favorable emission efficiency is provided. Alternatively, a light-emitting device with a favorable lifetime is provided. Alternatively, a light-emitting device with a low driving voltage is provided. Provided is a light-emitting device including an anode, a cathode, and a layer including an organic compound that is positioned between the anode and the cathode, in which the layer including the organic compound includes a first layer, a second layer, and a light-emitting layer in this order from the anode side, the first layer includes a first substance and a second substance, the second layer includes a third substance, the first substance is an organic compound a HOMO level of which is higher than or equal to ?5.8 eV and lower than or equal to ?5.Type: ApplicationFiled: June 28, 2024Publication date: October 24, 2024Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Tsunenori Suzuki, Yusuke Takita, Takumu Okuyama, Anna Tada
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Publication number: 20240357845Abstract: A light-emitting element having high emission efficiency which includes a fluorescent material as a light-emitting substance is provided. A light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a light-emitting layer. The light-emitting layer includes a host material and a guest material. The host material has a difference of more than 0 eV and less than or equal to 0.2 eV between a singlet excitation energy level and a triplet excitation energy level. The guest material is capable of emitting fluorescence. The triplet excitation energy level of the host material is higher than a triplet excitation energy level of the guest material.Type: ApplicationFiled: May 23, 2024Publication date: October 24, 2024Inventors: Satoshi SEO, Nobuharu OHSAWA, Shunsuke HOSOUMI, Takahiro ISHISONE
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Publication number: 20240357929Abstract: A novel photoelectric conversion device that is highly convenient, useful, or reliable is provided. A photoelectric conversion device (550S) includes a first electrode (551S), a second electrode (552S), and a unit (103S); the unit (103S) is interposed between the first electrode (551S) and the second electrode (552S); the unit (103S) includes a first layer (113) and a second layer (114S); and the first layer (113) is interposed between the second electrode (552S) and the second layer (114S). The first layer (113) contains a first organic compound ETM, the first organic compound ETM has an electron-transport property, and the first organic compound ETM has a LUMO level in a first level LUMO1. The second layer (114S) contains a second organic compound CTM, the second organic compound CTM emits delayed fluorescent light at room temperature, and the second organic compound CTM has a LUMO level in a second level LUMO2.Type: ApplicationFiled: August 3, 2022Publication date: October 24, 2024Inventors: Yasuhiro NIIKURA, Daisuke KUBOTA, Taisuke KAMADA, Sachiko KAWAKAMI, Anna TADA, Satoshi SEO
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Patent number: 12127418Abstract: 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: GrantFiled: December 20, 2022Date of Patent: October 22, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Nobuharu Ohsawa
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Patent number: 12127471Abstract: A light-emitting element which includes a plurality of light-emitting layers between a pair of electrodes and has low driving voltage and high emission efficiency is provided. A light-emitting element including first to third light-emitting layers between a cathode and an anode is provided. The first light-emitting layer includes a first phosphorescent material and a first electron-transport material; the second light-emitting layer includes a second phosphorescent material and a second electron-transport material; the third light-emitting layer includes a fluorescent material and a third electron-transport material; the first to third light-emitting elements are provided in contact with an electron-transport layer positioned on a cathode side; and a triplet excitation energy level of a material included in the electron-transport layer is lower than triplet excitation energy levels of the first electron-transport material and the second electron-transport material.Type: GrantFiled: June 29, 2023Date of Patent: October 22, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Tsunenori Suzuki, Naoaki Hashimoto, Eriko Saijo, Satoshi Seo
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Patent number: 12127479Abstract: To provide a light-emitting element with an improved reliability, a light-emitting element with a high current efficiency (or a high quantum efficiency), and a novel dibenzo[f,h]quinoxaline derivative that is favorably used in a light-emitting element which is one embodiment of the present invention. A light-emitting element includes an EL layer between an anode and a cathode. The EL layer includes a light-emitting layer; the light-emitting layer contains a first organic compound having an electron-transport property and a hole-transport property, a second organic compound having a hole-transport property, and a light-emitting substance; the combination of the first organic compound and the second organic compound forms an exciplex; the HOMO level of the first organic compound is lower than the HOMO level of the second organic compound; and a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV.Type: GrantFiled: October 19, 2023Date of Patent: October 22, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Takao Hamada, Tatsuyoshi Takahashi, Yasushi Kitano, Hiroki Suzuki, Hideko Inoue
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Patent number: 12127419Abstract: An object is to provide a light-emitting element which uses a plurality of kinds of light-emitting dopants and has high emission efficiency. In one embodiment of the present invention, a light-emitting device, a light-emitting module, a light-emitting display device, an electronic device, and a lighting device each having reduced power consumption by using the above light-emitting element are provided. Attention is paid to Förster mechanism, which is one of mechanisms of intermolecular energy transfer. Efficient energy transfer by Förster mechanism is achieved by making an emission wavelength of a molecule which donates energy overlap with the longest-wavelength-side local maximum peak of a graph obtained by multiplying an absorption spectrum of a molecule which receives energy by a wavelength raised to the fourth power.Type: GrantFiled: September 25, 2023Date of Patent: October 22, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Shunpei Yamazaki, Takahiro Ishisone
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Publication number: 20240349546Abstract: It is an object to provide a flexible light-emitting device with long lifetime in a simple way and to provide an inexpensive electronic device with long lifetime using the flexible light-emitting device. A flexible light-emitting device is provided, which includes a substrate having flexibility and a light-transmitting property with respect to visible light; a first adhesive layer over the substrate; an insulating film containing nitrogen and silicon over the first adhesive layer; a light-emitting element including a first electrode, a second electrode facing the first electrode, and an EL layer between the first electrode and the second electrode; a second adhesive layer over the second electrode; and a metal substrate over the second adhesive layer, wherein the thickness of the metal substrate is 10 ?m to 200 ?m inclusive. Further, an electronic device using the flexible light-emitting device is provided.Type: ApplicationFiled: March 4, 2024Publication date: October 17, 2024Inventors: Kaoru HATANO, Satoshi SEO, Takaaki NAGATA, Tatsuya OKANO
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Publication number: 20240349531Abstract: A novel light-emitting device that is highly convenient, useful, or reliable is provided. The light-emitting device includes a first electrode, a second electrode, a first layer, a second layer, and a third layer. The first layer is interposed between the first electrode and the second electrode. The second layer is interposed between the second electrode and the first layer. The third layer is interposed between the second layer and the first layer. The first layer contains a first light-emitting material. The first light-emitting material has an emission spectrum having a peak at a wavelength ?1. The first layer has an ordinary refractive index n1 at the wavelength ?1. The second layer contains a second light-emitting material. The second light-emitting material has an emission spectrum having a peak at a wavelength ?2. The second layer has an ordinary refractive index n2 at the wavelength ?2.Type: ApplicationFiled: October 3, 2022Publication date: October 17, 2024Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Takeyoshi WATABE, Nobuharu OHSAWA, Satoshi SEO
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Patent number: 12120900Abstract: To provide a light-emitting device not only including a light-emitting layer in which energy is efficiently transferred from a host material to a guest material but also having high reliability. The light-emitting device not only includes a light-emitting layer in which the T1 levels and the S1 levels of a host material and a guest material fall within certain ranges so that energy can be efficiently transferred from the host material to the guest material and but also has improved reliability.Type: GrantFiled: August 27, 2019Date of Patent: October 15, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventor: Satoshi Seo
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Publication number: 20240341177Abstract: A light-emitting element containing a light-emitting material and having high light emission efficiency is provided. The light-emitting element includes a host material and a guest material. The host material includes at least a first molecule and a second molecule having the same molecular structure. The guest material has a function of exhibiting fluorescence or converting triplet excitation energy into light emission. The first molecule and the second molecule each include a first skeleton, a second skeleton, and a third skeleton, and the first skeleton and the second skeleton are bonded to each other through the third skeleton. The first skeleton includes at least one of a ?-electron rich heteroaromatic skeleton and an aromatic amine skeleton and the second skeleton includes a ?-electron deficient heteroaromatic skeleton. The first molecule and the second molecule have a function of forming an excited complex.Type: ApplicationFiled: June 17, 2024Publication date: October 10, 2024Inventors: Satoshi SEO, Nobuharu OHSAWA