Patents by Inventor Takatoshi Seto

Takatoshi Seto 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).

  • Patent number: 9856418
    Abstract: Disclosed is a phosphor including at least one of a nitride and an oxynitride, wherein the nitride and the oxynitride contain an alkaline-earth metal element, silicon, and an activator element. wherein the phosphor has a volume average particle diameter of greater than or equal to about 50 nm and less than or equal to about 400 nm and an inner quantum efficiency of greater than or equal to about 60% at an excitation wavelength of about 450 nm. The method of preparing a phosphor includes a precursor preparation process of preparing a phosphor precursor particles including a silicon nitride particles, a compound containing an alkaline-earth metal element, and a compound containing an activator element, wherein the compound containing an alkaline-earth metal element and the compound containing an activator element are deposited on the surface of the silicon nitride particles; and a firing process of firing the phosphor precursor particles.
    Type: Grant
    Filed: July 20, 2015
    Date of Patent: January 2, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Takuya Kitabatake, Fusaki Fujibayashi, Hiroko Endo, Masahide Yamada, Takatoshi Seto
  • Patent number: 9725648
    Abstract: A yellow phosphor is provided. The yellow phosphor includes a crystal formed of a compound that is represented by the following formula (1): Ln4?x(EuzM1?z)xSi12?yAlyO3+x+yN18?x?y(0.5?x?3, 0<z<0.3, 0<y?4) (1), wherein Ln includes at least one rare earth element, and M includes at least one selected from calcium (Ca), barium (Ba), strontium (Sr), and magnesium (Mg).
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: August 8, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Takamasa Izawa, Dohoon Kim, Masahiko Yoshino, Takatoshi Seto
  • Patent number: 9360784
    Abstract: A magenta toner for developing electrostatic latent images, wherein the magenta toner includes a magenta toner particle having a polymer binder and a colorant, wherein the colorant includes a magenta pigment or dye and a visible light-excitable nitride fluorescent substance.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: June 7, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Fusaki Fujibayashi, Takuya Kitabatake, Takatoshi Seto
  • Publication number: 20160017222
    Abstract: Disclosed is a phosphor including at least one of a nitride and an oxynitride, wherein the nitride and the oxynitride contain an alkaline-earth metal element, silicon, and an activator element. wherein the phosphor has a volume average particle diameter of greater than or equal to about 50 nm and less than or equal to about 400 nm and an inner quantum efficiency of greater than or equal to about 60% at an excitation wavelength of about 450 nm. The method of preparing a phosphor includes a precursor preparation process of preparing a phosphor precursor particles including a silicon nitride particles, a compound containing an alkaline-earth metal element, and a compound containing an activator element, wherein the compound containing an alkaline-earth metal element and the compound containing an activator element are deposited on the surface of the silicon nitride particles; and a firing process of firing the phosphor precursor particles.
    Type: Application
    Filed: July 20, 2015
    Publication date: January 21, 2016
    Inventors: Takuya KITABATAKE, Fusaki FUJIBAYASHI, Hiroko ENDO, Masahide YAMADA, Takatoshi SETO
  • Publication number: 20150192873
    Abstract: A magenta toner for developing electrostatic latent images, wherein the magenta toner includes a magenta toner particle having a polymer binder and a colorant, wherein the colorant includes a magenta pigment or dye and a visible light-excitable nitride fluorescent substance.
    Type: Application
    Filed: January 9, 2015
    Publication date: July 9, 2015
    Inventors: Fusaki FUJIBAYASHI, Takuya KITABATAKE, Takatoshi SETO
  • Publication number: 20150159085
    Abstract: A yellow phosphor is provided. The yellow phosphor includes a crystal formed of a compound that is represented by the following formula (1): Ln4?x(EuzM1?z)xSi12?yAlyO3+x+yN18?x?y(0.5?x?3, 0<y?4) (1), wherein Ln includes at least one selected from a Group IIIa element and a rare earth element, and M includes at least one selected from calcium (Ca), barium (Ba), strontium (Sr), and magnesium (Mg).
    Type: Application
    Filed: December 10, 2014
    Publication date: June 11, 2015
    Inventors: Takamasa IZAWA, Dohoon KIM, Masahiko YOSHINO, Takatoshi SETO
  • Patent number: 8992797
    Abstract: To provide a new phosphor of which fluorescence contains much red light component and has a large full width at half maximum, the crystal phase represented by the formula [I] is included in the phosphor. R3?x?y?z+w2MzA1.5x+y?w2Si6?w1?w2AlW1+w2Oy+w1N11?y?w1??[I] (R represents La, Gd, Lu, Y and/or Sc, M represents Ce, Eu, Mn, Yb, Pr and/or Tb, A represents Ba, Sr, Ca, Mg and/or Zn, and x, y, z, w1 and w2 are the numeric values in the following ranges: (1/7)?(3?x?y?z+w2)/6<(1/2), 0<(1.5x+y?w2)/6<(9/2), 0<x<3, 0?y<2, 0<z<1, 0?w1?5, 0?w2?5, and 0?w1+w2?5).
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 31, 2015
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Takatoshi Seto, Naoto Kijima
  • Patent number: 8828272
    Abstract: A phosphor includes a crystal phase of a formula (Ln,Ca,Ce)3+?Si6N11. In this formula, ? is from ?0.1 to 1.5, inclusive. When an object color of the phosphor is expressed by the L*a*b* color system, the value of (a*2+b*2)1/2 satisfies 71?(a*2+b*2)1/2. Also in the formula, Ln is La, Gd, Lu, Y, Sc, or any combination of these. When the phosphor is excited with light having a wavelength of 455 nm, it emits a color wherein x is from 0.400 to 0.570 inclusive, and y is from 0.420 to 0.590, inclusive, as expressed in the CIE standard coordinate system.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: September 9, 2014
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Takatoshi Seto, Naoto Kijima, Keiichi Seki, Ryuji Adachi, Hiroyasu Yamada, Tatsuya Inoue
  • Patent number: 8703019
    Abstract: A phosphor which emits light having high brightness, serves as an excellent orange or red phosphor whose light brightness is less decreased when exposed to an excitation source contains a crystal phase having the chemical composition expressed by the general formula [1]: (1?a?b)(Ln?pMII?1?pMIII?MIV?N3).a(MIV?(3n+2)/4NnO).b(AMIV?2N3)??[1] wherein Ln? represents a metal element selected from the group consisting of lanthanoids, Mn, and Ti; MnII? represents a divalent metal element except the Ln? element; MIII? represents a trivalent metal element; MIV? represents a tetravalent metal element; A represents a metal element selected from the group consisting of Li, Na, and K; 0<p?0.2; 0?a, 0?b, a+b>0, 0?n, and 0.002?(3n+2)a/4?0.9.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: April 22, 2014
    Assignees: Mitsubishi Chemical Corporation, Independent Administrative Institution National Institute for Materials Science
    Inventors: Naoto Hirosaki, Takatoshi Seto, Naoto Kijima
  • Publication number: 20140042898
    Abstract: To provide a yellow to orange phosphor which has high luminance and excellent temperature characteristics and which also has high luminance when mixed with a phosphor of a different color. A phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy ?20?a*??2, 71?b* and 71?(a*2+b*2)1/2, respectively: R3?x?y?z+w2MzA1.
    Type: Application
    Filed: October 18, 2013
    Publication date: February 13, 2014
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Takatoshi Seto, Naoto Kijima, Keiichi Seki, Ryuji Adachi, Hiroyasu Yamada, Tatsuya Inoue
  • Patent number: 8574459
    Abstract: To provide a yellow to orange phosphor which has high luminance and excellent temperature characteristics and which also has high luminance when mixed with a phosphor of a different color. A phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy ?20?a*??2, 71?b* and 71?(a*2+b*2)1/2, respectively: R3?x?y?z+w2MzA1.5x+y?w2Si6?w1?w2Alw1+w2Oy+w1N11?y?w1??[I].
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: November 5, 2013
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Takatoshi Seto, Naoto Kijima, Keiichi Seki, Ryuji Adachi, Hiroyasu Yamada, Tatsuya Inoue
  • Publication number: 20130234588
    Abstract: To provide a new phosphor of which fluorescence contains much red light component and has a large full width at half maximum, the crystal phase represented by the formula [I] is included in the phosphor. R3?x?y?z+w2MzA1.5x+y?w2Si6?w1?w2AlW1+w2Oy+w1N11?y?w1??[I] (R represents La, Gd, Lu, Y and/or Sc, M represents Ce, Eu, Mn, Yb, Pr and/or Tb, A represents Ba, Sr, Ca, Mg and/or Zn, and x, y, z, w1 and w2 are the numeric values in the following ranges: (1/7)?(3?x?y?z+w2)/6<(1/2), 0<(1.5x+y?w2)/6<(9/2), 0<x<3, 0?y<2, 0<z<1, 0?w1?5, 0?w2?5, and 0?w1+w2?5.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 12, 2013
    Inventors: Takatoshi SETO, Naoto Kijima
  • Patent number: 8398890
    Abstract: To provide a new phosphor of which fluorescence contains much red light component and has a large full width at half maximum, the crystal phase represented by the formula [I] is included in the phosphor. R3?x?y?z+w2MzA1.5x+y?w2Si6?w1?w2AlW1+w2Oy+w1N11?y?w1??[I] (R represents La, Gd, Lu, Y and/or Sc, M represents Ce, Eu, Mn, Yb, Pr and/or Tb, A represents Ba, Sr, Ca, Mg and/or Zn, and x, y, z, w1 and w2 are the numeric values in the following ranges: ( 1/7)?(3?x?y?z+w2)/6<(½), 0<(1.
    Type: Grant
    Filed: October 19, 2009
    Date of Patent: March 19, 2013
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Takatoshi Seto, Naoto Kijima
  • Publication number: 20120286646
    Abstract: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr, Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.12?b/(a+b)?0.4.
    Type: Application
    Filed: April 26, 2012
    Publication date: November 15, 2012
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Hiroaki SAKUTA, Kazuhiko Kagawa, Yoshihito Sato, Takatoshi Seto, Naoto Kijima
  • Publication number: 20120267999
    Abstract: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr,Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.12?b/(a+b)?0.4.).
    Type: Application
    Filed: March 2, 2012
    Publication date: October 25, 2012
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Hiroaki Sakuta, Kazuhiko Kagawa, Yoshihito Sato, Takatoshi Seto, Naoto Kijima
  • Publication number: 20120262648
    Abstract: A phosphor which emits light having high brightness, serves as an excellent orange or red phosphor whose light brightness is less decreased when exposed to an excitation source contains a crystal phase having the chemical composition expressed by the general formula [1]: (1?a?b)(Ln?pMII?1-pMIII?MIV?N3).a(MIV?(3n+2)/4NnO).b(AMIV?2N3)??[1] wherein Ln? represents a metal element selected from the group consisting of lanthanoids, Mn, and Ti; MnII? represents a divalent metal element except the Ln? element; MIII? represents a trivalent metal element; MIV? represents a tetravalent metal element; A represents a metal element selected from the group consisting of Li, Na, and K; 0<p?0.2; 0?a, 0?b, a+b>0, 0?n, and 0.002?(3n+2)a/4?0.9.
    Type: Application
    Filed: May 22, 2012
    Publication date: October 18, 2012
    Applicants: Independent Administrative Institution National Institute For Materials Science, Mitsubishi Chemical Corporation
    Inventors: Naoto HIROSAKI, Takatoshi Seto, Naoto Kijima
  • Publication number: 20120256533
    Abstract: To provide a yellow to orange phosphor which has high luminance and excellent temperature characteristics and which also has high luminance when mixed with a phosphor of a different color. A phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy ?20?a*??2, 71?b* and 71?(a*2+b*2)1/2, respectively: R3?x?y?z+w2MzA1.
    Type: Application
    Filed: September 23, 2011
    Publication date: October 11, 2012
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Takatoshi Seto, Naoto Kijima, Keiichi Seki, Ryuji Adachi, Hiroyasu Yamada, Tatsuya Inoue
  • Publication number: 20120212123
    Abstract: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr,Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.05?b/(a+b)?0.6.
    Type: Application
    Filed: February 29, 2012
    Publication date: August 23, 2012
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Hiroaki SAKUTA, Kazuhiko Kagawa, Yoshihito Sato, Takatoshi Seto, Naoto Kijima
  • Patent number: 8206611
    Abstract: A phosphor which emits light having high brightness, serves as an excellent orange or red phosphor whose light brightness is less decreased when exposed to an excitation source contains a crystal phase having the chemical composition expressed by the general formula [1]: (1?a?b)(Ln?pMII?1?pMIII?MIV?N3).a(MIV?(3n+2)/4NnO).b(AMIV?2N3)??[1] wherein Ln? represents a metal element selected from the group consisting of lanthanoids, Mn, and Ti; MnII? represents a divalent metal element except the Ln? element; MIII? represents a trivalent metal element; MIV? represents a tetravalent metal element; A represents a metal element selected from the group consisting of Li, Na, and K; 0<p?0.2; 0?a, 0?b, a+b>0, 0?n, and 0.002?(3n+2)a/4?0.9.
    Type: Grant
    Filed: May 24, 2006
    Date of Patent: June 26, 2012
    Assignees: Mitsubishi Chemical Corporation, Independent Administrative Institution National Institute for Materials Science
    Inventors: Naoto Hirosaki, Takatoshi Seto, Naoto Kijima
  • Publication number: 20100090585
    Abstract: To provide a phosphor that stably shows high emission intensity and brightness as well as superior temperature characteristics, under excitation by near-ultraviolet light, the phosphor contains an alkaline-earth metal aluminate and has a crystal phase comprising an alkali metal element and, in that crystal phase, the rate of substituted Eu (europium) to the number of sites which can be substituted with Eu of the crystal phase is 25% or higher and the ratio of the alkali metal element to the number of sites which can be substituted with Eu of the crystal phase is 3% or lower.
    Type: Application
    Filed: September 29, 2009
    Publication date: April 15, 2010
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Takatoshi SETO, Naoto KIJIMA, Etsuo SHIMIZU, Kumie SHIMIZU