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2006 Fiscal Year Final Research Report Summary

Development of high-brightness phosphors with quantum yield > 1

Research Project

Project/Area Number 17560007
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionSHINSHU UNIVERSITY

Principal Investigator

ITOH Minoru  Shinshu University, Faculty of Engineering, Professor, 工学部, 教授 (80126664)

Project Period (FY) 2005 – 2006
KeywordsOptical property / Phosphor / Quantum yield / Luminescence / Time-resolved measurement / Synchrotron radiation / High-brightness / Two-photon emission process
Research Abstract

In modern society, a great deal of information necessary for everyday life is processed and memorized in electronic devices such as computers, and we cannot see it directly. Display devices, which visualize the memorized information on the screen, are widely used as an interface between humans and computers. They also play an important role for home entertainment. A high reliability of the screen image, which is determined by the brightness, resolution, contrast, speed and legibility, prevents eye fatigue, and is deeply required for advanced display devices.
Phosphor particles are the most important element for the display devices. In the present work, we focus our efforts on a new type core-valence luminescence. This is called "Auger-free luminescence (AFL)." In the emission process of AFL, two photons are emitted under one-photon excitation process of the outer-most core band ; i.e., two-step cascade process takes place efficiently. This leads to high brightness ; it is expected that the quantum yield is more than 1.
Many materials emitting AFL are investigated by using synchrotron radiation from UVSOR storage ring in Okazaki. The decay dynamics of AFL is also examined. Furthermore, their time-resolved luminescence spectra are measured under the excitation with a Nd : YAG laser. From these data, emission centers and lattice imperfections are clarified. The obtained results will play a significant role for the development of high-brightness phosphors.

  • Research Products

    (16 results)

All 2007 2006

All Journal Article (15 results) Book (1 results)

  • [Journal Article] Luminescence Properties of Piezoelectric Single Crystals with Langasite Structure2007

    • Author(s)
      M.Itoh, S.Takagi, M.Kitaura, M.Fujita, N.Endo
    • Journal Title

      J. Lumin 122-123

      Pages: 205-207

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Infrared Absorption Change in Single-Walled Carbon Nanotubes Observed by Combination Spectroscopy of Synchrotron Radiation and Laser2006

    • Author(s)
      J.Azuma, M.Itoh, M.Koike, M.Kamada, M.Endo
    • Journal Title

      J.Synchrotron Rad. 13(6)

      Pages: 464-467

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] X-Ray Photoelectoron Spectroscopy and Electronic Structures of Scheelite- and Wolframite-Type Tungstate Crystals2006

    • Author(s)
      M.Itoh, N.Fujita, Y.Inabe
    • Journal Title

      J.Phys.Soc.Jpn. 75(8)

      Pages: 084705

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Comparative Study of Optical Spectra and Electronic Structures of CaMoO_4 and CaWO_4 Crystals2006

    • Author(s)
      M.Fujita, M.Itoh, S.Takagi, T.Shimizu, N.Fujita
    • Journal Title

      Phys. Status Solidi B 243(8)

      Pages: 1898-1907

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Time-Resolved Luminescence from Jahn-Teller Split States of Self-Trapped Excitons in PbWO_42006

    • Author(s)
      M.Itoh, T.Sakurai
    • Journal Title

      Phys.Rev.B 73(23)

      Pages: 235106

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Laser-Induced Infrared Absorption in Lead Tungstate Observed by Laser-SR Combined Spectroscopy2006

    • Author(s)
      M.Itoh, J.Azuma, T.Shimizu, M.Kamada, M.Kobayashi, Y.Usuki
    • Journal Title

      J.Lumin. 119-120

      Pages: 590-594

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Origin of Photocarrier Traps in Photorefractive α-LiIO_3 Crystals by Optical Measurement and Cluster Calculation2006

    • Author(s)
      M.Kitaura, N.Fujita, M.Itoh, H.Nakagawa
    • Journal Title

      Phys.Rev.B 73(11)

      Pages: 115110

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Infrared Absorption Change in Single-Walled Carbon Nanotubes Observed by Combination Spectroscopy of Synchrotron Radiation and Laser2006

    • Author(s)
      J.Azuma, M.Itoh, M.Koike, M.Kamada, M.Endo
    • Journal Title

      J. Synchrotron Rad. 13(6)

      Pages: 464-467

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Cathodoluminescent Phosphors2006

    • Author(s)
      M.Itoh, L.Ozawa
    • Journal Title

      Annu. Rep. Prog. Chem., Sect. C 102

      Pages: 12-42

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Eradication of Oxygen Contamination in Production of ZnS : Ag : Cl Blue Phosphor Powder2006

    • Author(s)
      L.Ozawa, M.Makimura, M.Itoh
    • Journal Title

      Mater. Chem. Phys. 96

      Pages: 511-516

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Origin of Photocarrier Traps in Photorefractive α-LiIO_3 Crystals by Optical Measurement and Cluster Calculation2006

    • Author(s)
      M.Kitaura, N.Fujita, M.Itoh, H.Nakagawa
    • Journal Title

      Phys. Rev. B 73(11)

      Pages: 115110

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Laser-Induced Infrared Absorption in Lead Tungstate Observed by Laser-SR Combined Spectroscopy2006

    • Author(s)
      M.Itoh, J.Azuma, T.Shimizu, M.Kamada, M.Kobayashi, Y.Usuki
    • Journal Title

      J. Lumin. 119-120

      Pages: 590-594

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Time-Resolved Luminescence from Jahn-Teller Split States of Self-Trapped Excitons in PbWO_42006

    • Author(s)
      M.Itoh, T.Sakurai
    • Journal Title

      Phys. Rev. B 73(23)

      Pages: 235106

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Comparative Study of Optical Spectra and Electronic Structures of CaMoO_4 and CaWO_4 Crystals2006

    • Author(s)
      M.Fujita, M.Itoh, S.Takagi, T.Shimizu, N.Fujita
    • Journal Title

      Phys. Status Solidi B 243

      Pages: 1898-1907

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] X-Ray Photoelectron Spectroscopy and Electronic Structures of Scheelite-and Wolframite-Type Tungstate Crystals2006

    • Author(s)
      M.Itoh, N.Fujita, Y.Inabe
    • Journal Title

      J. Phys. Soc. Jpn. 75(8)

      Pages: 84705

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] Annual Reports on the Progress of Chemistry, Section C2006

    • Author(s)
      M.Itoh, L.Ozawa
    • Total Pages
      31
    • Publisher
      Royal Society of Chemistry, Cambridge
    • Description
      「研究成果報告書概要(和文)」より

URL: 

Published: 2008-05-27  

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