Patents by Inventor Naoto Hirosaki

Naoto Hirosaki 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).

  • PHOSPHOR AND USE THEREOF
    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
  • PHOSPHOR, PROCESS FOR PRODUCING THE SAME, AND LUMINESCENT DEVICE
    Publication number: 20120176568
    Abstract: A green phosphor for emitting light, a spectrum of which is sharp, in an ultraviolet and visible light region, which has higher green light brightness than the conventional rare earth-activated sialon phosphor and has higher durability than the conventional oxide phosphor, is provided. The phosphor being characterized in that Al and a metal element M (here, M is Eu) are incorporated into a crystal of a nitride or oxynitride having a ?-type Si3N4 crystal structure as a solid solution, the content of oxygen in the crystal does not exceed 0.8% by mass, and the phosphor emits a visible light having a luminescence peak wavelength in the range of 450 nm to 650 nm upon exposure to an excitation source is provided. This luminescence spectrum has a sharp spectrum shape. Further, a manufacturing method of the phosphor, a lighting device and an image display device utilizing the phosphor are also provided.
    Type: Application
    Filed: March 22, 2012
    Publication date: July 12, 2012
    Inventor: Naoto HIROSAKI
  • Phosphor and use thereof
    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
  • PHOSPHOR, METHOD OF MANUFACTURING THE SAME, AND LIGHT-EMITTING DEVICE
    Publication number: 20120119234
    Abstract: The present invention is a phosphor expressed by the general formula (A1?xRxM2X)m(M2X4)n (wherein the element A is one or more types of element selected from Li, Na, Be, Mg, Ca, Sr, Ba, Sc, Y, La, Gd, and Lu, the element R is one or more types of activating agent selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb, the element M is one or more types of element selected from Si, Ge, Sn, Ti, Hf, Zr, Be, B, Al, Ga, In, Tl, and Zn, the element X is one or more types of element selected from oxygen and nitrogen, n and m are integers of 1 or more, and x is a real number defined by 0<x<1), as well as a manufacturing method for the same, and a light-emitting device that uses this phosphor.
    Type: Application
    Filed: August 4, 2010
    Publication date: May 17, 2012
    Applicants: NATIONAL INSTITUTE FOR MATERIALS SCIENCE, SHOWA DENKO K.K.
    Inventors: Kousuke Shioi, Naoto Hirosaki, Yuichi Michiue
  • LIGHT-EMITTING DEVICE
    Publication number: 20120104448
    Abstract: A semiconductor light-emitting device that is high in luminous efficiency and that emits light which is high in color rendering property includes a semiconductor light-emitting element that emits blue light; a green fluorescent substance that absorbs the blue light and emits green light; and an orange fluorescent substance that absorbs the blue light and emits orange light, fluorescence emitted by the green fluorescent substance and the orange fluorescent substance having an emission spectrum that has a peak wavelength of not less than 540 nm and not more than 565 nm and that satisfies the relation of 0.70>PI(90)/PI(MAX)>0.55, where PI(MAX) represents an emission intensity at the peak wavelength, and PI(90) represents an emission intensity at a wavelength 90 nm longer than the peak wavelength.
    Type: Application
    Filed: July 2, 2010
    Publication date: May 3, 2012
    Inventors: Kenichi Yoshimura, Kohsei Takahashi, Hirochi Fukunaga, Naoto Hirosaki
  • OXYNITRIDE FLUORESCENT MATERIAL AND LIGHT-EMITTING DEVICE
    Publication number: 20120099291
    Abstract: An oxynitride fluorescent material includes a JEM phase as a mother crystal and a luminescence center element Ce. The oxynitride fluorescent material has a fluorescence spectrum with a maximum emission wavelength of 420 nm to 500 nm inclusive and an excitation spectrum with a maximum excitation wavelength of 250 nm to 400 nm inclusive.
    Type: Application
    Filed: January 5, 2012
    Publication date: April 26, 2012
    Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventor: Naoto HIROSAKI
  • Phosphor, process for producing the same, and luminescent device
    Patent number: 8147715
    Abstract: A green phosphor for emitting light, a spectrum of which is sharp, in an ultraviolet and visible light region, which has higher green light brightness than the conventional rare earth-activated sialon phosphor and has higher durability than the conventional oxide phosphor, is provided. The phosphor being characterized in that Al and a metal element M (here, M is Eu) are incorporated into a crystal of a nitride or oxynitride having a ?-type Si3N4 crystal structure as a solid solution, the content of oxygen in the crystal does not exceed 0.8% by mass, and the phosphor emits a visible light having a luminescence peak wavelength in the range of 450 nm to 650 nm upon exposure to an excitation source is provided. This luminescence spectrum has a sharp spectrum shape. A manufacturing method of the phosphor, a lighting device and an image display device utilizing the phosphor are also provided.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: April 3, 2012
    Assignee: National Institute for Materials Science
    Inventor: Naoto Hirosaki
  • Light emitting diode lamp and light emitting device
    Patent number: 8148887
    Abstract: A bullet type light emitting diode lamp or a chip-type light emitting diode lamp includes a semiconductor light emitting element, and a plurality of fluorescent materials that absorb part or whole of light emitted from the semiconductor light emitting element, and emit fluorescence at a wavelength different from that of the absorbed light. The fluorescent materials include a phosphor of a CaAlSiN3 crystalline phase.
    Type: Grant
    Filed: August 8, 2008
    Date of Patent: April 3, 2012
    Assignee: National Institute for Materials Science
    Inventors: Naoto Hirosaki, Ken Sakuma, Kyota Ueda, Hajime Yamamoto
  • Oxynitride fluorescent material and light-emitting device
    Patent number: 8147718
    Abstract: An oxynitride fluorescent material includes a JEM phase as a mother crystal and a luminescence center element Ce. The oxynitride fluorescent material has a fluorescence spectrum with a maximum emission wavelength of 420 nm to 500 nm inclusive and an excitation spectrum with a maximum excitation wavelength of 250 nm to 400 nm inclusive.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: April 3, 2012
    Assignee: National Institute for Materials Science
    Inventor: Naoto Hirosaki
  • Fluorescent material, process for producing the same, and luminescent device
    Patent number: 8142685
    Abstract: A blue fluorescent material having excellent durability and a high luminance, especially one emitting a high-luminance light by the action of electron rays. The fluorescent material comprises inorganic crystals having a crystal structure which is an AlN crystalline, AlN polycrystalline, or AlN solid-solution crystalline structure. It is characterized in that the inorganic crystals contain at least europium in solution and have an oxygen content of 0.4 mass % or lower and that the fluorescent material emits fluorescence derived from divalent europium ions upon irradiation with an excitation source. More preferably, the fluorescent material contains a given metallic element and silicon. Also provided are a process for producing the fluorescent material and an illuminator including the blue fluorescent material.
    Type: Grant
    Filed: January 11, 2008
    Date of Patent: March 27, 2012
    Assignee: National Institute for Materials Science
    Inventor: Naoto Hirosaki
  • Phosphor, process for producing the same, and luminescent device
    Patent number: 8114313
    Abstract: A blue phosphor, which has excellent durability and high brightness, and in particular a blue phosphor in a powder state, which can realize high-brightness luminescence upon exposure to an electron beam, are provided. The phosphor being characterized by comprising at least europium incorporated as a solid solution into an inorganic crystal having a crystal structure of an AlN crystal or an AlN solid solution crystal, wherein the phosphor emits divalent europium-derived fluorescence having a peak at a wavelength in the range of 430 nm to 500 nm upon exposure to an excitation source, is provided. In this case, it is more preferable that a predetermined metal element and silicon are incorporated therein. And a manufacturing method to manufacture such phosphor is also provided. Further, a lighting device comprising such blue phosphor is provided.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: February 14, 2012
    Assignee: National Institute for Materials Science
    Inventor: Naoto Hirosaki
  • Phosphor, production method thereof and light emitting instrument
    Publication number: 20120032579
    Abstract: A light emitting element includes a light-emitting source for emitting light at a wavelength of 330 to 500 nm and a constituent phosphor. The constituent phosphor includes a compound including M, A, Al, O, and N, where M is at least one kind of element selected from Mn, Ce, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb, and A is at least one kind of element selected from C, Si, Ge, Sn, B, Ga, In, Mg, Ca, Sr, Ba, Sc, Y, La, Gd, Lu, Ti, Zr, Hf, Ta, and W.
    Type: Application
    Filed: October 12, 2011
    Publication date: February 9, 2012
    Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventor: Naoto Hirosaki
  • PHOSPHOR, METHOD FOR PRODUCING SAME, LIGHT-EMITTING DEVICE, AND IMAGE DISPLAY APPARATUS
    Publication number: 20120019127
    Abstract: A phosphor comprising a CaAlSiN3 group crystal as a host crystal and emitting highly-intense light, a manufacturing method and an application of the same are provided. In the present invention, the phosphor comprises at least lithium (Li), calcium (Ca), silicon (Si), aluminum (Al), oxygen (O), nitrogen (N), and cerium (Ce) elements, and has a CaAlSiN3 crystal or a crystal having the same crystal structure as CaAlSiN3. And a phosphor emitting yellow, orange, or red luminescence can be produced by controlling a composition thereof.
    Type: Application
    Filed: March 26, 2010
    Publication date: January 26, 2012
    Inventor: Naoto Hirosaki
  • Sialon phosphor
    Patent number: 8057705
    Abstract: A SiAlON phosphor represented by a general formula (1) Lup(Si, Al)12(O, N)16:Euq??(1) wherein at least a main phase has an alpha SiAlON crystal structure; and 0.25?p?0.65.
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: November 15, 2011
    Assignees: Fujikura Ltd., National Institute for Materials Science
    Inventors: Ken Sakuma, Naoto Hirosaki
  • Phosphor, method for producing same, and light-emitting device
    Patent number: 8057704
    Abstract: Disclosed are violet, blue, and green phosphors having excellent durability and high luminance. Specifically disclosed is a phosphor which contains a metal element M (M is at least one element selected from among Mn, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Tm and Yb) for constituting a metal ion, which is solid-solubilized in an AlON crystal, an AlON solid solution crystal or an inorganic crystal having the same crystal structure as AlON. The phosphor is capable of emitting fluorescence having a peak in the wavelength range from 300 nm to 700 nm. Also disclosed is a method for producing such a phosphor. Further disclosed are an illuminating device and an image display each containing such a phosphor.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: November 15, 2011
    Assignee: National Institute for Materials Science
    Inventors: Rong-Jun Xie, Naoto Hirosaki
  • Light emitting device and illumination device
    Patent number: 8053970
    Abstract: An LED with a semiconductor light emitting element that emits a blue or a blue-violet light, and a fluorescent material that absorbs some or all of the light emitted from the element and emits a fluorescent light of a wavelength different from the absorbed light. The fluorescent material is a mixed fluorescent material obtained by mixing a first fluorescent material that emits a blue-green or a green light, a second fluorescent material that has a peak emission wavelength longer than that of the first fluorescent material and emits a green or a yellow-green light, a third fluorescent material that has a 1 peak emission wavelength longer than that of the second fluorescent material and emits a yellow-green, a yellow or a yellow-red light, and a fourth fluorescent material that has a peak emission wavelength longer than that of the third fluorescent material and emits a yellow-red or a red light.
    Type: Grant
    Filed: February 11, 2009
    Date of Patent: November 8, 2011
    Assignees: Fujikura Ltd., National Institute for Materials Science
    Inventors: Naoki Kimura, Ryuji Suzuki, Ken Sakuma, Naoto Hirosaki
  • ILLUMINATION DEVICE FOR DISPLAY DEVICE, AND DISPLAY DEVICE
    Publication number: 20110235309
    Abstract: An illumination device for a display device, which is formed from a substrate and a plurality of white light-emitting devices disposed on top of the substrate, and can be used as a backlight for a liquid crystal display panel, wherein the white light-emitting devices have a light source and a phosphor that is excited by the light source and emits light, and a fluorescent material with a composition represented by a general formula: M(0)aM(1)bM(2)x?(vm+n)M(3)(vm+n)?yOnNz?n is used as the phosphor.
    Type: Application
    Filed: November 25, 2009
    Publication date: September 29, 2011
    Applicants: SHOWA DENKO K.K., NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Hisayuki Miki, Kousuke Shioi, Naoto Hirosaki
  • Oxynitride fluorescent material and light-emitting device
    Patent number: 8007684
    Abstract: The invention has for its object the provision of an oxynitride fluorescent material has higher emission luminance than conventional rare earth element-activated sialon fluorescent materials. To this end, an oxynitride fluorescent material is designed in such a way as comprising a JEM phase as a mother crystal and a luminescence center element M1. For instance, the luminescence center element M1 is at least one kind of an element selected from Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. And the JEM phase is expressed as a general formula MA1(Si6-zAlz) N10-zOz (where M indicates a metal element, 0.1?z?3).
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: August 30, 2011
    Assignee: National Institute For Materials Science
    Inventor: Naoto Hirosaki
  • ? type sialon fluorescent substance
    Patent number: 8003011
    Abstract: A ? type Sialon fluorescent substance is disclosed that is capable of achieving enhanced brightness of a white light emitting diode using blue to ultraviolet light as a light source. In the fluorescent substance which contains not less than 90% by mass of a ? type Sialon composition represented by general formula: Si6-zAlzOzN8-z as a host material wherein z is not less than 0.24 and not more than 0.42, Eu is present dissolved in solid solution as a luminescent center at a content of 0.05 to 0.2% by atom. The ? type Sialon fluorescent substance is preferably in the form of a powder having an average particle size of not less than 1 ?m and not more than 20 ?m. A white LED of good luminescent characteristics can be obtained by using a blue or ultraviolet light emitting diode as a excitation light source in combination with a fluorescent substance that emits yellow or red light.
    Type: Grant
    Filed: May 10, 2006
    Date of Patent: August 23, 2011
    Assignees: National Institute for Materials Science, Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Naoto Hirosaki, Hideyuki Emoto, Masahiro Ibukiyama
  • Oxynitride fluorescent material and light-emitting device
    Publication number: 20110175519
    Abstract: An oxynitride fluorescent material includes a JEM phase as a mother crystal and a luminescence center element Ce. The oxynitride fluorescent material has a fluorescence spectrum with a maximum emission wavelength of 420 nm to 500 nm inclusive and an excitation spectrum with a maximum excitation wavelength of 250 nm to 400 nm inclusive.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 21, 2011
    Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventor: Naoto Hirosaki