Patents by Inventor Susumu Kuwabata
Susumu Kuwabata 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: 20240387784Abstract: Provided is an efficient method for producing semiconductor nanoparticles that exhibit band edge emission. The method comprises performing a first heat treatment of a first mixture, which contains a Cu salt, a Ag salt, a salt containing at least one of In or Ga, a gallium halide, and an organic solvent, to obtain first semiconductor nanoparticles. At least one of the Cu salt, the Ag salt, or the salt containing at least one of In or Ga in the first mixture contains a compound having a bond formed of a metal and sulfur.Type: ApplicationFiled: July 8, 2022Publication date: November 21, 2024Applicants: NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Susumu KUWABATA, Taro UEMATSU, Tomoya KUBO, Yohei IKAGAWA, Daisuke OYAMATSU
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Patent number: 12113148Abstract: Provided is a method for manufacturing a semiconductor nanoparticle, the method includes performing a heat treatment of a first mixture containing a silver (Ag) salt, an alkali metal salt, a salt containing at least one of indium (In) and gallium (Ga), a sulfur source, and an organic solvent. A ratio of the number of atoms of an alkali metal to the total number of atoms of Ag and the alkali metal in the first mixture is greater than 0 and less than 1.Type: GrantFiled: July 25, 2023Date of Patent: October 8, 2024Assignees: National University Corporation Tokai National Higher Education and Research System, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa Torimoto, Tatsuya Kameyama, Yuki Mori, Hiroki Yamauchi, Susumu Kuwabata, Taro Uematsu, Daisuke Oyamatsu
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Publication number: 20240332462Abstract: Semiconductor nanoparticles including Ag, In, Ga, and S are provided. In the semiconductor nanoparticles, a ratio of a number of Ga atoms to a total number of In and Ga atoms is 0.95 or less. The semiconductor nanoparticles emit light having an emission peak with a wavelength in a range of from 500 nm to less than 590 nm, and a half bandwidth of 70 nm or less, and have an average particle diameter of 10 nm or less.Type: ApplicationFiled: June 6, 2024Publication date: October 3, 2024Applicants: NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Marino KISHI, Chie MIYAMAE, Susumu KUWABATA, Taro UEMATSU, Daisuke OYAMATSU, Kenta NIKI
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Patent number: 12074253Abstract: Provided is a method of producing semiconductor nanoparticles that exhibit a band-edge emission, and are superior in quantum yield. The method includes raising the temperature of a first mixture containing a silver (Ag) salt, a salt containing at least one of indium (In) and gallium (Ga), a solid compound that serves as a supply source of sulfur (S), and an organic solvent to a temperature in a range of from 125 ?C to 175 ?C, and heat-treating, subsequent to the raising of the temperature, the first mixture at a temperature in a range of from 125 ?C to 175 ?C for three seconds or more to obtain a solution containing semiconductor nanoparticles, and decreasing the temperature of the solution containing semiconductor nanoparticles. The solid compound that serves as a supply source of S contains thiourea.Type: GrantFiled: November 7, 2022Date of Patent: August 27, 2024Assignees: OSAKA UNIVERSITY, National University Corporation Tokai National Higher Education and Research System, NICHIA CORPORATIONInventors: Susumu Kuwabata, Taro Uematsu, Kazutaka Wajima, Tsukasa Torimoto, Tatsuya Kameyama, Daisuke Oyamatsu
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Patent number: 12040433Abstract: Semiconductor nanoparticles including Ag, In, Ga, and S are provided. In the semiconductor nanoparticles, a ratio of a number of Ga atoms to a total number of In and Ga atoms is 0.95 or less. The semiconductor nanoparticles emit light having an emission peak with a wavelength in a range of from 500 nm to less than 590 nm, and a half bandwidth of 70 nm or less, and have an average particle diameter of 10 nm or less.Type: GrantFiled: March 28, 2023Date of Patent: July 16, 2024Assignees: NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa Torimoto, Tatsuya Kameyama, Marino Kishi, Chie Miyamae, Susumu Kuwabata, Taro Uematsu, Daisuke Oyamatsu, Kenta Niki
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Publication number: 20240209258Abstract: Provided is a method of producing semiconductor nanoparticles that exhibit band-edge emission and have excellent band-edge emission purity and internal quantum yield.Type: ApplicationFiled: February 22, 2022Publication date: June 27, 2024Applicants: NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Susumu KUWABATA, Taro UEMATSU, Yohei IKAGAWA, Daisuke OYAMATSU, Tomoya KUBO
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Patent number: 11981849Abstract: Semiconductor nanoparticles are provided. The semiconductor nanoparticles contains Ag, at least one of In and Ga, and Se. An Ag content is 10 mol % to 30 mol %, a total content of the at least one of In and Ga is 15 mol % to 35 mol %, and an Se content is 35 mol % to 55 mol % in the semiconductor nanoparticles. The semiconductor nanoparticles emit light having an emission spectrum with a peak emission wavelength in a range of 500 nm to 900 nm, and a half bandwidth of 250 meV or less upon irradiation with light in a wavelength range of 350 nm to less than 500 nm.Type: GrantFiled: February 16, 2021Date of Patent: May 14, 2024Assignees: NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa Torimoto, Tatsuya Kameyama, Hiroki Yamauchi, Chie Miyamae, Yuki Mori, Susumu Kuwabata, Taro Uematsu, Daisuke Oyamatsu
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Publication number: 20240063334Abstract: Provided is a method for manufacturing a semiconductor nanoparticle, the method includes performing a heat treatment of a first mixture containing a silver (Ag) salt, an alkali metal salt, a salt containing at least one of indium (In) and gallium (Ga), a sulfur source, and an organic solvent. A ratio of the number of atoms of an alkali metal to the total number of atoms of Ag and the alkali metal in the first mixture is greater than 0 and less than 1.Type: ApplicationFiled: July 25, 2023Publication date: February 22, 2024Applicants: National University Corporation Tokai National Higher Education and Research System, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Yuki MORI, Hiroki YAMAUCHI, Susumu KUWABATA, Taro UEMATSU, Daisuke OYAMATSU
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Publication number: 20230416603Abstract: A semiconductor nanoparticle includes a core and a shell covering a surface of the core. The shell has a larger bandgap energy than the core and is in heterojunction with the core. The semiconductor nanoparticle emits light when irradiated with light. The core is made of a semiconductor that contains M1, M2, and Z. M1 is at least one element selected from the group consisting of Ag, Cu, and Au. M2 is at least one element selected from the group consisting of Al, Ga, In and Tl. Z is at least one element selected from the group consisting of S, Se, and Te. The shell is made of a semiconductor that consists essentially of a Group 13 element and a Group 16 element.Type: ApplicationFiled: September 11, 2023Publication date: December 28, 2023Applicants: OSAKA UNIVERSITY, NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, NICHIA CORPORATIONInventors: Susumu KUWABATA, Taro UEMATSU, Kazutaka WAJIMA, Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Daisuke OYAMATSU, Kenta NIKI
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Patent number: 11788003Abstract: A semiconductor nanoparticle includes a core and a shell covering a surface of the core. The shell has a larger bandgap energy than the core and is in heterojunction with the core. The semiconductor nanoparticle emits light when irradiated with light. The core is made of a semiconductor that contains M1, M2, and Z. M1 is at least one element selected from the group consisting of Ag, Cu, and Au. M2 is at least one element selected from the group consisting of Al, Ga, In and Tl. Z is at least one element selected from the group consisting of S, Se, and Te. The shell is made of a semiconductor that consists essentially of a Group 13 element and a Group 16 element.Type: GrantFiled: September 28, 2021Date of Patent: October 17, 2023Assignees: OSAKA UNIVERSITY, NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, NICHIA CORPORATIONInventors: Susumu Kuwabata, Taro Uematsu, Kazutaka Wajima, Tsukasa Torimoto, Tatsuya Kameyama, Daisuke Oyamatsu, Kenta Niki
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Patent number: 11757064Abstract: Provided is a method for manufacturing a semiconductor nanoparticle, the method includes performing a heat treatment of a first mixture containing a silver (Ag) salt, an alkali metal salt, a salt containing at least one of indium (In) and gallium (Ga), a sulfur source, and an organic solvent. A ratio of the number of atoms of an alkali metal to the total number of atoms of Ag and the alkali metal in the first mixture is greater than 0 and less than 1.Type: GrantFiled: March 11, 2020Date of Patent: September 12, 2023Assignees: National University Corporation Tokai National Higher Education and Research System, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa Torimoto, Tatsuya Kameyama, Yuki Mori, Hiroki Yamauchi, Susumu Kuwabata, Taro Uematsu, Daisuke Oyamatsu
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Publication number: 20230253533Abstract: Semiconductor nanoparticles including Ag, In, Ga, and S are provided. In the semiconductor nanoparticles, a ratio of a number of Ga atoms to a total number of In and Ga atoms is 0.95 or less. The semiconductor nanoparticles emit light having an emission peak with a wavelength in a range of from 500 nm to less than 590 nm, and a half bandwidth of 70 nm or less, and have an average particle diameter of 10 nm or less.Type: ApplicationFiled: March 28, 2023Publication date: August 10, 2023Applicants: NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Marino KISHI, Chie MIYAMAE, Susumu KUWABATA, Taro UEMATSU, Daisuke OYAMATSU, Kenta NIKI
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Publication number: 20230151271Abstract: Provided is a method of producing semiconductor nanoparticles exhibiting band-edge emission with a short emission peak wavelength. The method of producing semiconductor nanoparticles comprises: obtaining a first mixture that contains a Ag salt, an In salt, a compound containing Ga and S, and an organic solvent; and performing a heat treatment of the first mixture at a temperature in a range of 125° C. or higher and 300° C. or lower to obtain first semiconductor nanoparticles.Type: ApplicationFiled: March 8, 2021Publication date: May 18, 2023Applicants: National University Corporation Tokai National Higher Education and Research System, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Susumu KUWABATA, Taro UEMATSU, Yohei IKAGAWA, Daisuke OYAMATSU, Tomoya KUBO
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Patent number: 11652194Abstract: Semiconductor nanoparticles including Ag, In, Ga, and S are provided. In the semiconductor nanoparticles, a ratio of a number of Ga atoms to a total number of In and Ga atoms is 0.95 or less. The semiconductor nanoparticles emit light having an emission peak with a wavelength in a range of from 500 nm to less than 590 nm, and a half bandwidth of 70 nm or less, and have an average particle diameter of 10 nm or less.Type: GrantFiled: July 14, 2021Date of Patent: May 16, 2023Assignees: NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa Torimoto, Tatsuya Kameyama, Marino Kishi, Chie Miyamae, Susumu Kuwabata, Taro Uematsu, Daisuke Oyamatsu, Kenta Niki
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Publication number: 20230120918Abstract: Provided is a method of producing semiconductor nanoparticles that exhibit a band-edge emission, and are superior in quantum yield. The method includes raising the temperature of a first mixture containing a silver (Ag) salt, a salt containing at least one of indium (In) and gallium (Ga), a solid compound that serves as a supply source of sulfur (S), and an organic solvent to a temperature in a range of from 125 ?C to 175 ?C, and heat-treating, subsequent to the raising of the temperature, the first mixture at a temperature in a range of from 125 ?C to 175 ?C for three seconds or more to obtain a solution containing semiconductor nanoparticles, and decreasing the temperature of the solution containing semiconductor nanoparticles. The solid compound that serves as a supply source of S contains thiourea.Type: ApplicationFiled: November 7, 2022Publication date: April 20, 2023Applicants: OSAKA UNIVERSITY, National University Corporation Tokai National Higher Education and Research System, NICHIA CORPORATIONInventors: Susumu KUWABATA, Taro UEMATSU, Kazutaka WAJIMA, Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Daisuke OYAMATSU
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Patent number: 11532767Abstract: Provided is a method of producing semiconductor nanoparticles that exhibit a band-edge emission, and are superior in quantum yield. The method includes raising the temperature of a first mixture containing a silver (Ag) salt, a salt containing at least one of indium (In) and gallium (Ga), a solid compound that serves as a supply source of sulfur (S), and an organic solvent to a temperature in a range of from 125° C. to 175° C., and heat-treating, subsequent to the raising of the temperature, the first mixture at a temperature in a range of from 125° C. to 175° C. for three seconds or more to obtain a solution containing semiconductor nanoparticles, and decreasing the temperature of the solution containing semiconductor nanoparticles. The solid compound that serves as a supply source of S contains thiourea.Type: GrantFiled: February 15, 2019Date of Patent: December 20, 2022Assignees: OSAKA UNIVERSITY, National University Corporation Tokai National Higher Education and Research System, NICHIA CORPORATIONInventors: Susumu Kuwabata, Taro Uematsu, Kazutaka Wajima, Tsukasa Torimoto, Tatsuya Kameyama, Daisuke Oyamatsu
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Publication number: 20220285589Abstract: Provided is a method for producing semiconductor nanoparticles. The method includes: providing first semiconductor nanoparticles containing a semiconductor containing an element M1, an element M2 and an element Z, wherein the element M1 is at least one element selected from the group consisting of Ag, Cu, Au and an alkali metal, and contains at least Ag, the element M2 is at least one element selected from the group consisting of Al, Ga, In and Tl, and contains at least one of In and Ga, and the element Z contains at least one element selected from the group consisting of S, Se and Te; and heat-treating a mixture containing the first semiconductor nanoparticles, a first compound having a Ga—S bond, a second compound containing Ga and not containing S, and an organic solvent to obtain second semiconductor nanoparticles.Type: ApplicationFiled: March 7, 2022Publication date: September 8, 2022Applicants: National University Corporation Tokai National Higher Education and Research System, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Chie MIYAMAE, Susumu KUWABATA, Taro UEMATSU, Tomoya KUBO
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Patent number: 11332663Abstract: Provided is a ternary or quaternary semiconductor nanoparticle that enables the band-edge emission and a less toxic composition. A semiconductor nanoparticle is provided that contains Ag, In, and S and has an average particle size of 50 nm or less, wherein the ratio of the number of atoms of Ag to the total number of atoms of Ag and In is 0.320 or more and 0.385 or less, the ratio of the number of atoms of S to the total number of atoms of Ag and In is 1.20 or more and 1.45 or less. The semiconductor nanoparticle is adapted to emit photoluminescence having a photoluminescence lifetime of 200 ns or less upon being irradiated with light having a wavelength in a range of 350 nm to 500 nm.Type: GrantFiled: November 13, 2020Date of Patent: May 17, 2022Assignees: NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION and RESEARCH SYSTEM, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa Torimoto, Tatsuya Kameyama, Marino Kishi, Susumu Kuwabata, Taro Uematsu, Daisuke Oyamatsu
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Publication number: 20220089452Abstract: Provided is a method for producing a semiconductor nanoparticle including preparing a mixture containing a Ag salt, a salt containing at least one of In and Ga, and an organic solvent; raising the temperature of the mixture to a raised temperature in a range of from 120° C. to 300° C.; and adding a supply source of S to the mixture at the raised temperature in such a manner that a ratio of a number of S atoms to a number of Ag atoms in the mixture increases at a rate of not more than 10/min.Type: ApplicationFiled: February 7, 2020Publication date: March 24, 2022Applicants: National University Corporation Tokai National Higher Education and Research System, OSAKA UNIVERSITY, NICHIA CORPORATIONInventors: Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Susumu KUWABATA, Taro UEMATSU, Daisuke OYAMATSU
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Publication number: 20220017819Abstract: A semiconductor nanoparticle includes a core and a shell covering a surface of the core. The shell has a larger bandgap energy than the core and is in heterojunction with the core. The semiconductor nanoparticle emits light when irradiated with light. The core is made of a semiconductor that contains M1, M2, and Z. M1 is at least one element selected from the group consisting of Ag, Cu, and Au. M2 is at least one element selected from the group consisting of Al, Ga, In and Tl. Z is at least one element selected from the group consisting of S, Se, and Te. The shell is made of a semiconductor that consists essentially of a Group 13 element and a Group 16 element.Type: ApplicationFiled: September 28, 2021Publication date: January 20, 2022Applicants: OSAKA UNIVERSITY, NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, NICHIA CORPORATIONInventors: Susumu KUWABATA, Taro UEMATSU, Kazutaka WAJIMA, Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Daisuke OYAMATSU, Kenta NIKI