Patents by Inventor Makoto Izumi

Makoto Izumi 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: 9716211
    Abstract: There is provided a semiconductor phosphor nanoparticle comprising: a nano particle core composed of a compound semiconductor, a first coating layer coating the nano particle core, and a second coating layer bonded to an outer surface of the first coating layer through Si—O bonding.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: July 25, 2017
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yasutaka Kuzumoto, Tatsuya Ryohwa, Mami Morishita, Noriyuki Yamazumi, Makoto Izumi
  • Publication number: 20170200841
    Abstract: A photoelectric conversion element includes a photoelectric conversion layer having the quantum structure and utilizes intersubband transition in a conduction band. The photoelectric conversion element includes a superlattice semiconductor layer in which a barrier layer and a quantum dot layer as a quantum layer are alternately and repeatedly stacked. The barrier layer includes an indirect transition semiconductor material, and the quantum dot layer has a nano-structure including a direct transition semiconductor material. The indirect transition semiconductor material constituting the barrier layer has a bandgap of more than 1.42 eV at room temperature.
    Type: Application
    Filed: December 14, 2016
    Publication date: July 13, 2017
    Inventors: Hirofumi YOSHIKAWA, Makoto IZUMI, Yasuhiko ARAKAWA, Katsuyuki WATANABE
  • Publication number: 20170167693
    Abstract: A light emitting structure comprises a translucent support, a liquid dispersion medium, and a semiconductor nanoparticle phosphor. Preferably, the light emitting structure is formed such that the translucent support has a pore, the liquid dispersion medium is held in the pore of the translucent support, and the semiconductor nanoparticle phosphor is dispersed in the liquid dispersion medium. Furthermore, preferably, the light emitting structure is such that the translucent support includes a macromolecular chain forming a three-dimensional mesh structure, and one or more types of semiconductor nanoparticle phosphors are dispersed in a gelated material including the translucent support and the liquid dispersion medium and presented in a wet state.
    Type: Application
    Filed: December 12, 2016
    Publication date: June 15, 2017
    Inventors: Noriyuki YAMAZUMI, Yasutaka KUZUMOTO, Tatsuya RYOHWA, Mami MORISHITA, Makoto IZUMI
  • Publication number: 20170166807
    Abstract: A phosphor containing particle includes a semiconductor nanoparticle phosphor and a matrix including a constitutional unit derived from an ionic liquid, the semiconductor nanoparticle phosphor being dispersed in the matrix. A light emitting device comprises a light source and a wavelength converter in which the phosphor containing particle of the present invention is dispersed in a translucent medium. A phosphor containing sheet in which the phosphor containing particle of the present invention is dispersed in a sheet-like translucent medium.
    Type: Application
    Filed: December 12, 2016
    Publication date: June 15, 2017
    Inventors: Yasutaka KUZUMOTO, Tatsuya RYOHWA, Mami MORISHITA, Noriyuki YAMAZUMI, Makoto IZUMI
  • Patent number: 9601643
    Abstract: A photoelectric conversion element includes a superlattice semiconductor layer including barrier sub-layers and quantum sub-layers (quantum dot sub-layers) alternately stacked and also includes a wavelength conversion layer containing a wavelength conversion material converting the wavelength of incident light. The wavelength conversion layer converts incident light into light with a wavelength corresponding to an optical transition from a quantum level of the conduction band of the superlattice semiconductor layer to a continuum level of the conduction band.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: March 21, 2017
    Assignees: Sharp Kabushiki Kaisha, THE UNIVERSITY OF TOKYO
    Inventors: Hirofumi Yoshikawa, Makoto Izumi, Yasuhiko Arakawa
  • Publication number: 20170062668
    Abstract: The present invention provides a light emitting device that makes it possible to provide an image display apparatus having a wide color reproduction range. The light emitting device includes a light emitting element that emits blue light; a Mn2+-activated ?-AlON phosphor that is a green phosphor; and a Mn4+-activated phosphor that is a red phosphor. The green light emitted by the Mn2+-activated ?-AlON phosphor has an emission-spectrum peak wavelength of not less than 518 nm and not more than 528 nm.
    Type: Application
    Filed: August 15, 2016
    Publication date: March 2, 2017
    Inventors: Kenichi YOSHIMURA, Shigetoshi ITO, Makoto IZUMI, Masamichi HARADA, Hiroshi FUKUNAGA, Naoto HIROSAKI
  • Patent number: 9577160
    Abstract: A light-emitting device includes a light-emitting element emitting blue light, a green phosphor emitting green light when being excited by the blue light, and a red phosphor emitting red light when being excited by the blue light. An emission spectral peak wavelength of the green light emitted by the green phosphor is greater than or equal to 520 nm and less than or equal to 540 nm.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: February 21, 2017
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kenichi Yoshimura, Tatsuya Ryohwa, Makoto Izumi, Junichi Kinomoto
  • Publication number: 20170030532
    Abstract: A light emitting device includes a light source and a wavelength converter that includes a resin including a constitutional unit that includes an ionic liquid or a derivative of the ionic liquid, and a semiconductor nanoparticle phosphor included in the resin and provided on at least a portion of the light source. A wavelength converter includes a resin including a constitutional unit that includes an ionic liquid or a derivative of the ionic liquid, and a semiconductor nanoparticle phosphor included in the resin and emitting fluorescence upon receiving excitation light. A light emitting device includes the wavelength converter and a light source emitting excitation light to the wavelength converter, which is provided separately from the wavelength converter.
    Type: Application
    Filed: July 13, 2016
    Publication date: February 2, 2017
    Inventors: Tatsuya RYOHWA, Mami MORISHITA, Noriyuki YAMAZUMI, Makoto IZUMI, Yasutaka KUZUMOTO, Takuya NAKASHIMA, Tsuyoshi KAWAI
  • Publication number: 20170025583
    Abstract: There is provided a semiconductor phosphor nanoparticle comprising: a nano particle core composed of a compound semiconductor, a first coating layer coating the nano particle core, and a second coating layer bonded to an outer surface of the first coating layer through Si—O bonding.
    Type: Application
    Filed: July 13, 2016
    Publication date: January 26, 2017
    Inventors: Yasutaka KUZUMOTO, Tatsuya RYOHWA, Mami MORISHITA, Noriyuki YAMAZUMI, Makoto IZUMI
  • Publication number: 20170025558
    Abstract: A photoelectric conversion element includes a superlattice semiconductor layer including barrier sub-layers and quantum sub-layers (quantum dot sub-layers) alternately stacked and also includes a wavelength conversion layer containing a wavelength conversion material converting the wavelength of incident light. The wavelength conversion layer converts incident light into light with a wavelength corresponding to an optical transition from a quantum level of the conduction band of the superlattice semiconductor layer to a continuum level of the conduction band.
    Type: Application
    Filed: May 26, 2016
    Publication date: January 26, 2017
    Inventors: Hirofumi YOSHIKAWA, Makoto IZUMI, Yasuhiko ARAKAWA
  • Publication number: 20160351757
    Abstract: A light-emitting device includes a light-emitting element configured to emit blue light, a first wavelength conversion member containing a Mn4+-activated fluorine complex phosphor, and a second wavelength conversion member containing a quantum-dot phosphor, in which the first wavelength conversion member and the second wavelength conversion member are spatially separated from each other.
    Type: Application
    Filed: May 17, 2016
    Publication date: December 1, 2016
    Inventors: Kenichi YOSHIMURA, Tatsuya RYOHWA, Makoto IZUMI
  • Publication number: 20160315230
    Abstract: A light-emitting device includes a light-emitting element emitting blue light, a green phosphor emitting green light when being excited by the blue light, and a red phosphor emitting red light when being excited by the blue light. An emission spectral peak wavelength of the green light emitted by the green phosphor is greater than or equal to 520 nm and less than or equal to 540 nm.
    Type: Application
    Filed: December 17, 2015
    Publication date: October 27, 2016
    Inventors: Kenichi Yoshimura, Tatsuya Ryohwa, Makoto Izumi, Junichi Kinomoto
  • Patent number: 9410079
    Abstract: A phosphor nanoparticle includes a nanoparticle core composed of a compound semiconductor, a shell layer that covers the nanoparticle core, and a modifying organic compound bound to the outer surface of the shell layer. The modifying organic compound exhibits absorption in at least part of a wavelength range of 300 nm or more and 400 nm or less.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: August 9, 2016
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yasutaka Kuzumoto, Tatsuya Ryohwa, Makoto Izumi
  • Publication number: 20160225963
    Abstract: A wavelength converting member includes silica glass and a plurality of fluorescent material particles including an oxynitride or nitride fluorescent material and dispersed in the silica glass. The plurality of fluorescent material particles include at least two kinds of fluorescent material particles including (i) first fluorescent material particles that emit a fluorescence having a first peak wavelength and (ii) second fluorescent material particles that emit a fluorescence having a second peak wavelength. The wavelength converting member has a density within a range from 0.8 g/cm3 to 1.2 g/cm3.
    Type: Application
    Filed: January 25, 2016
    Publication date: August 4, 2016
    Inventors: Kenichi Yoshimura, Makoto Izumi, Masamichi Harada, Hiroshi Fukunaga, Kazunori Annen, Naoto Hirosaki, Hiroyo Segawa
  • Patent number: 9240507
    Abstract: A light receiving element includes a p-type semiconductor layer, an n-type semiconductor layer, and a first and a second superlattice semiconductor layers, and the first and the second superlattice semiconductor layers each have a superlattice structure in which a barrier layer and a quantum dot layer are alternately and repeatedly stacked. A band structure of the superlattice structure of the first superlattice semiconductor layer is a type I structure, and that of the second superlattice semiconductor layer is a type II structure. The superlattice structures of the first and the second superlattice semiconductor layers each form a superlattice miniband, and a conduction band first superlattice miniband of the superlattice structure of the second superlattice semiconductor layer is lower in lower and energy than a conduction band first superlattice miniband of the superlattice structure of the first superlattice semiconductor layer.
    Type: Grant
    Filed: January 5, 2015
    Date of Patent: January 19, 2016
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hirofumi Yoshikawa, Makoto Izumi, Yasutaka Kuzumoto
  • Publication number: 20150214402
    Abstract: A light receiving element includes a p-type semiconductor layer, an n-type semiconductor layer, and a first and a second superlattice semiconductor layers, and the first and the second superlattice semiconductor layers each have a superlattice structure in which a barrier layer and a quantum dot layer are alternately and repeatedly stacked. A band structure of the superlattice structure of the first superlattice semiconductor layer is a type I structure, and that of the second superlattice semiconductor layer is a type II structure. The superlattice structures of the first and the second superlattice semiconductor layers each form a superlattice miniband, and a conduction band first superlattice miniband of the superlattice structure of the second superlattice semiconductor layer is lower in lower and energy than a conduction band first superlattice miniband of the superlattice structure of the first superlattice semiconductor layer.
    Type: Application
    Filed: January 5, 2015
    Publication date: July 30, 2015
    Inventors: Hirofumi YOSHIKAWA, Makoto IZUMI, Yasutaka KUZUMOTO
  • Publication number: 20150129814
    Abstract: A phosphor nanoparticle includes a nanoparticle core composed of a compound semiconductor, a shell layer that covers the nanoparticle core, and a modifying organic compound bound to the outer surface of the shell layer. The modifying organic compound exhibits absorption in at least part of a wavelength range of 300 nm or more and 400 nm or less.
    Type: Application
    Filed: October 29, 2014
    Publication date: May 14, 2015
    Inventors: Yasutaka KUZUMOTO, Tatsuya RYOHWA, Makoto IZUMI
  • Publication number: 20140326302
    Abstract: An solar cell of the present invention includes a p-type semiconductor layer, an n-type semiconductor layer, and a superlattice semiconductor layer interposed between the p-type semiconductor layer and the n-type semiconductor layer, in which the superlattice semiconductor layer has a superlattice structure in which barrier layers and quantum dot layers each including a plurality of quantum dots are stacked alternately and repeatedly, the superlattice semiconductor layer contains an n-type dopant and has at least two intermediate energy levels at which electrons photoexcited from the valence band of the quantum dots or the barrier layers can be present for a certain period of time, each of the intermediate energy levels is located between the top of the valence band of the barrier layers and the bottom of the conduction band of the barrier layers, each of the intermediate energy levels is formed from one or a plurality of quantum levels of the quantum dots, and the superlattice semiconductor layer contains an
    Type: Application
    Filed: September 20, 2012
    Publication date: November 6, 2014
    Inventors: Yasuhiko Arakawa, Tomohiro Nozawa, Makoto Izumi
  • Patent number: 8823258
    Abstract: A fluorescent material-sealed sheet includes a plurality of fluorescent sections, an upper sealing section, and a lower sealing section, the plurality of fluorescent sections being sealed by the upper sealing section and the lower sealing section.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: September 2, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tatsuya Ryowa, Yoshitaka Tomomura, Makoto Izumi, Kazunori Annen, Masato Ohno
  • Patent number: 8603364
    Abstract: A phosphor includes semiconductor nanoparticles formed of compound semiconductor, and conductive transparent compounds. The semiconductor nanoparticles may be dispersed in or on the conductive transparent compounds. The resistivity of the conductive transparent compounds is preferably less than or equal to 10 ?cm.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: December 10, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Makoto Izumi, Noboru Iwata, Kazunori Annen