Patents by Inventor Satoko Shitagaki
Satoko Shitagaki 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: 20190189949Abstract: 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: ApplicationFiled: February 25, 2019Publication date: June 20, 2019Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Satoko SHITAGAKI, Satoshi SEO, Nobuharu OHSAWA, Hideko INOUE, Masahiro TAKAHASHI, Kunihiko SUZUKI
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Publication number: 20190173038Abstract: A light-emitting element having high external quantum efficiency is provided. A light-emitting element having low drive voltage is provided. Provided is a light-emitting element which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes. A combination of the first organic compound and the second organic compound forms an exciplex (excited complex). An emission spectrum of the exciplex overlaps with an absorption band located on the longest wavelength side of an absorption spectrum of the phosphorescent compound. A peak wavelength of the emission spectrum of the exciplex is longer than or equal to a peak wavelength of the absorption band located on the longest wavelength side of the absorption spectrum of the phosphorescent compound.Type: ApplicationFiled: February 11, 2019Publication date: June 6, 2019Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Satoshi Seo, Satoko Shitagaki, Nobuharu Ohsawa, Hideko Inoue, Kunihiko Suzuki
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Publication number: 20190157577Abstract: A light-emitting element having high external quantum efficiency is provided. A light-emitting element having a long lifetime is provided. A light-emitting element is provided which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes, in which a combination of the first organic compound and the second organic compound forms an exciplex (excited complex). The light-emitting element transfers energy by utilizing an overlap between the emission spectrum of the exciplex and the absorption spectrum of the phosphorescent compound and thus has high energy transfer efficiency. Therefore, a light-emitting element having high external quantum efficiency can be obtained.Type: ApplicationFiled: January 30, 2019Publication date: May 23, 2019Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Satoko SHITAGAKI, Satoshi SEO, Nobuharu OHSAWA, Hideko INOUE, Kunihiko SUZUKI
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Patent number: 10263195Abstract: A novel substance with which an increase in life and emission efficiency of a light-emitting element can be achieved is provided. A carbazole compound having a structure represented by General Formula (G1) is provided. Note that a substituent which makes the HOMO level and the LUMO level of a compound in which a bond of the substituent is substituted with hydrogen deep and shallow, respectively is used as each of substituents in General Formula (G1) (R1, R2, Ar3, and ?3). Further, a substituent which makes the band gap (Bg) and the T1 level of a compound in which a bond of the substituent is substituted with hydrogen wide and high is used as each of the substituents in General Formula (G1) (R1, R2, Ar3, and ?3).Type: GrantFiled: February 17, 2017Date of Patent: April 16, 2019Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Harue Osaka, Takako Takasu, Hiroshi Kadoma, Yuko Kawata, Satoko Shitagaki, Hiromi Nowatari, Tsunenori Suzuki, Nobuharu Ohsawa, Satoshi Seo
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Publication number: 20190088897Abstract: Objects of the present invention are to provide: a light-emitting element having a long lifetime and good emission efficiency and drive voltage. One embodiment of the invention is a light-emitting element including, between an anode and a cathode, at least a stack structure in which a first layer, a second layer, and a light-emitting layer are provided in order from the anode side. The first layer includes a first organic compound and an electron-accepting compound. The second layer includes a second organic compound having a HOMO level differing from the HOMO level of the first organic compound by from ?0.2 eV to +0.2 eV. The light-emitting layer includes a third organic compound having a HOMO level differing from the HOMO level of the second organic compound by from ?0.2 eV to +0.2 eV and a light-emitting substance having a hole-trapping property with respect to the third organic compound.Type: ApplicationFiled: November 8, 2018Publication date: March 21, 2019Inventors: Satoshi SEO, Tsunenori SUZUKI, Satoko SHITAGAKI
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Publication number: 20190074450Abstract: A novel substance with which an increase in life and emission efficiency of a light-emitting element can be achieved is provided. A carbazole compound having a structure represented by General Formula (G1) is provided. Note that a substituent which makes the HOMO level and the LUMO level of a compound in which a bond of the substituent is substituted with hydrogen deep and shallow, respectively is used as each of substituents in General Formula (G1) (R1, R2, Ar3, and ?3). Further, a subsistent which makes the band gap (Bg) and the T1 level of a compound in which a bond of the substituent is substituted with hydrogen wide and high is used as each of the substituents in General Formula (G1) (R1, R2, Ar3, and ?3).Type: ApplicationFiled: October 24, 2018Publication date: March 7, 2019Inventors: Harue OSAKA, Takako TAKASU, Hiroshi KADOMA, Yuko KAWATA, Satoko SHITAGAKI, Hiromi NOWATARI, Tsunenori SUZUKI, Nobuharu OHSAWA, Satoshi SEO
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Patent number: 10205100Abstract: An organic compound having a high T1 level is provided. An element emitting phosphorescence in the blue and green regions is provided. An organic compound having a high glass-transition temperature is provided. A light-emitting element, a light-emitting device, an electronic appliance, or a lighting device having high heat resistance is provided. A light-emitting element includes at least a hole-transport layer, a light-emitting layer, and an electron-transport layer between an anode and a cathode. An anthracene compound represented by General Formula (G1) is contained in at least one of the hole-transport layer, the light-emitting layer, and the electron-transport layer.Type: GrantFiled: October 7, 2016Date of Patent: February 12, 2019Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Masato Suzuki, Nobuharu Ohsawa, Satoko Shitagaki, Harue Osaka
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Publication number: 20190040009Abstract: To provide a light-emitting element having high luminous efficiency and to provide a light-emitting device and an electronic device which consumes low power and is driven at low voltage, a carbazole derivative represented by the general formula (1) is provided. In the formula, ?1, ?2, ?3, and ?4 each represent an arylene group having less than or equal to 13 carbon atoms; Ar1 and Ar2 each represent an aryl group having less than or equal to 13 carbon atoms; R1 represents any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group; and R2 represents any of an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group. In addition, l, m, and n are each independently 0 or 1.Type: ApplicationFiled: September 24, 2018Publication date: February 7, 2019Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hiroko Nomura, Harue OSAKA, Takahiro USHIKUBO, Sachiko KAWAKAMI, Satoshi SEO, Satoko SHITAGAKI
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Patent number: 10193097Abstract: It is an object to provide a light-emitting element having long lifetime. A light-emitting element is provided, in which a light-emitting layer, a first layer, and a second layer are provided between a first electrode and a second electrode; the first layer is provided between the light-emitting layer and the first electrode; the second layer is provided between the light-emitting layer and the second electrode; the first layer is a layer for controlling the hole transport; the second layer is a layer for controlling the electron transport; and light emission is obtained from the light-emitting layer by applying voltage to the first electrode and the second electrode such that the potential of the first electrode is higher than that of the second electrode.Type: GrantFiled: February 17, 2016Date of Patent: January 29, 2019Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Tsunenori Suzuki, Satoko Shitagaki, Satoshi Seo
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Patent number: 10181563Abstract: A novel substance with which an increase in life and emission efficiency of a light-emitting element can be achieved is provided. A carbazole compound having a structure represented by General Formula (G1) is provided. Note that a substituent which makes the HOMO level and the LUMO level of a compound in which a bond of the substituent is substituted with hydrogen deep and shallow, respectively is used as each of substituents in General Formula (G1) (R1, R2, Ar3, and ?3). Further, a substituent which makes the band gap (Bg) and the T1 level of a compound in which a bond of the substituent is substituted with hydrogen wide and high is used as each of the substituents in General Formula (G1) (R1, R2, Ar3, and ?3).Type: GrantFiled: February 17, 2017Date of Patent: January 15, 2019Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Harue Osaka, Takako Takasu, Hiroshi Kadoma, Yuko Kawata, Satoko Shitagaki, Hiromi Nowatari, Tsunenori Suzuki, Nobuharu Ohsawa, Satoshi Seo
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Patent number: 10134996Abstract: It is an object of the present invention to provide a composite material that can be used for manufacturing a heat-resistant light-emitting element, provide a composite material that can be used for manufacturing a heat-resistant light-emitting element that can be driven with stability for a long period of time, and further, provide a composite material that can be used for manufacturing a light-emitting element that easily prevents short circuit between electrodes and uses less power. The present invention provides a composite material that has a first metal oxide skeleton including a first metal atom and an organic compound that is bound to the first metal atom by forming a chelate, where the first metal oxide exhibits an electron accepting property to the organic compound.Type: GrantFiled: August 19, 2013Date of Patent: November 20, 2018Assignee: Semicondcutor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Harue Nakashima, Ryoji Nomura, Satoko Shitagaki
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Publication number: 20180269410Abstract: A light-emitting element having high external quantum efficiency is provided. A light-emitting element having a long lifetime is provided. A light-emitting element is provided which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes, in which a combination of the first organic compound and the second organic compound forms an exciplex (excited complex). The light-emitting element transfers energy by utilizing an overlap between the emission spectrum of the exciplex and the absorption spectrum of the phosphorescent compound and thus has high energy transfer efficiency. Therefore, a light-emitting element having high external quantum efficiency can be obtained.Type: ApplicationFiled: May 21, 2018Publication date: September 20, 2018Inventors: Satoko SHITAGAKI, Satoshi SEO, Nobuharu OHSAWA, Hideko INOUE, Kunihiko SUZUKI
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Patent number: 10079350Abstract: To provide a novel organometallic complex, and light emitting elements, light emitting devices, and electronic devices which include the organometallic complex. In addition, to provide a composition in which the organometallic complex is dissolved and to provide a method for manufacturing light emitting elements using the composition. An organometallic complex has high solubility in a solvent. In the organometallic complex, the ligand including a pyrazine skeleton is bound to an atom belonging to Group 9 (Co, Rh, or Ir) or an atom belonging to Group 10 (Ni, Pd, or Pt). In addition, the light emission efficiency is high. Therefore, the organometallic complex is preferably used for manufacturing a light emitting element.Type: GrantFiled: July 25, 2016Date of Patent: September 18, 2018Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hideko Inoue, Satoko Shitagaki, Satoshi Seo
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Patent number: 10062867Abstract: A light-emitting element having high external quantum efficiency is provided. A light-emitting element having a long lifetime is provided. A light-emitting element includes a light-emitting layer between a pair of electrodes. The light-emitting layer contains at least a phosphorescent compound, a first organic compound (host material) having an electron-transport property, and a second organic compound (assist material) having a hole-transport property. The light-emitting layer has a stacked-layer structure including a first light-emitting layer and a second light-emitting layer, and the first light-emitting layer contains a higher proportion of the second organic compound than the second light-emitting layer. In the light-emitting layer (the first light-emitting layer and the second light-emitting layer), a combination of the first organic compound and the second organic compound forms an exciplex.Type: GrantFiled: March 2, 2017Date of Patent: August 28, 2018Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hiromi Seo, Satoko Shitagaki, Satoshi Seo, Takahiro Ushikubo, Toshiki Sasaki, Shogo Uesaka
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Publication number: 20180212154Abstract: A light-emitting element includes a light-emitting layer including a guest, an n-type host and a p-type host between a pair of electrodes, where the difference between the energy difference between a triplet excited state and a ground state of the n-type host (or p-type host) and the energy difference between a triplet excited state and a ground state of the guest is 0.15 eV or more. Alternatively, in such a light-emitting element, the LUMO level of the n-type host is higher than the LUMO level of the guest by 0.1 eV or more, or the HOMO level of the p-type host is lower than the HOMO level of the guest by 0.1 eV or more.Type: ApplicationFiled: March 23, 2018Publication date: July 26, 2018Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Satoshi SEO, Nobuharu OHSAWA, Satoko SHITAGAKI, Hideko INOUE, Hiroshi KADOMA, Harue OSAKA, Kunihiko SUZUKI, Yasuhiko TAKEMURA
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Publication number: 20180159062Abstract: In a light-emitting element including an EL layer between a pair of electrodes, between an electrode functioning as an anode and a fourth layer having a light-emitting property (light-emitting layer), the EL layer includes at least a first layer having a hole-injecting property (hole-injecting layer), a second layer having a hole-transporting property (first hole-transporting layer), and a third layer having a hole-transporting property (second hole-transporting layer). The absolute value of the highest occupied molecular orbital level (HOMO level) of the second layer is larger than the absolute value of the highest occupied molecular orbital level (HOMO level) of each of the first layer and the third layer. With such a structure, the rate of transport of holes injected from the electrode functioning as an anode is reduced and emission efficiency of the light-emitting element is improved.Type: ApplicationFiled: January 10, 2018Publication date: June 7, 2018Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoko Shitagaki, Tsunenori Suzuki, Satoshi Seo
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Patent number: 9985218Abstract: A light-emitting element with low drive voltage, a light-emitting element with high current efficiency, and/or a light-emitting element with a long lifetime are/is provided. Specifically, a light-emitting element with low drive voltage, a light-emitting element with high current efficiency, and/or a light-emitting element with a long lifetime are/is provided by the use of an organic compound with a dibenzo[f,h]quinoxaline skeleton in a light-emitting layer.Type: GrantFiled: July 30, 2013Date of Patent: May 29, 2018Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Harue Osaka, Hiroshi Kadoma, Yasushi Kitano, Satoko Shitagaki, Nobuharu Ohsawa, Satoshi Seo
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Patent number: 9985223Abstract: Provided is a novel substance that can emit phosphorescence. Alternatively, provided is a novel substance with high emission efficiency. An organometallic complex in which a 4-arylpyrimidine derivative is a ligand and iridium is a central metal is provided. Specifically, an organometallic complex having a structure represented by a general formula (G1) is provided. In the general formula (G1), R1 represents a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms, R2 represents any of hydrogen, a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, and a substituted or unsubstituted phenyl group, R3 represents hydrogen or a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, and Ar1 represents a substituted or unsubstituted arylene group having 6 to 10 carbon atoms.Type: GrantFiled: November 6, 2015Date of Patent: May 29, 2018Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hideko Inoue, Tomoya Yamaguchi, Satoko Shitagaki, Takahiro Ushikubo, Satoshi Seo, Yui Yamada, Hiromi Nowatari
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Patent number: 9972794Abstract: Disclosed is an organometallic complex capable of variable phosphorescence characteristics and yellow emission at high luminance. The organometallic complex has a structure represented by a formula (G1), where at least one of R4, R5, R6, and R7 is a phenoxy group, M is a Group 9 metal or a Group 10 metal, and n is 2 when the central metal M is a Group 9 element, or n is 1 when the central metal M is a Group 10 element.Type: GrantFiled: November 2, 2016Date of Patent: May 15, 2018Assignee: Semiconductor Laboratory Co., Ltd.Inventors: Hideko Inoue, Nobuharu Ohsawa, Satoko Shitagaki, Satoshi Seo
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Patent number: 9960368Abstract: Provided is a novel heterocyclic compound which can be used for a light-emitting element, as a host material of a light-emitting layer in which a light-emitting substance is dispersed. A heterocyclic compound represented by a general formula (G1) is provided. In the formula, A represents any of a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted dibenzofuranyl group, and a substituted or unsubstituted carbazolyl group, R11 to R19 separately represent any of hydrogen, an alkyl group having 1 to 4 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms, and Ar represents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms.Type: GrantFiled: February 9, 2017Date of Patent: May 1, 2018Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hiroshi Kadoma, Yasushi Kitano, Satoko Shitagaki, Nobuharu Ohsawa, Satoshi Seo