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Preparation of transparent nanocrystal phosphors and their application for wavelength conversion optical devices

Research Project

Project/Area Number 17310076
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nanomaterials/Nanobioscience
Research InstitutionKeio University

Principal Investigator

ISOBE Tetsuhiko  Keio University, Faculty of Science and Technology, Associate Professor, 理工学部, 助教授 (30212971)

Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥14,200,000 (Direct Cost: ¥14,200,000)
Fiscal Year 2006: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2005: ¥11,600,000 (Direct Cost: ¥11,600,000)
Keywordsnanocrystal / nanophosphor / optical properties / display / solid-state light emitting devices / LaPO_4 : Ce, Tb / ZnS : Mn / ナノ材料 / LaPO_4:Ce^<3+>,Tb^<3+> / ZnS:Mn^<2+> / SiO_2 / 電子・電気材料
Research Abstract

Chemically and thermally stable LaPO_4 doped with Ce^<3+> and Tb^<3+> exhibits green emission corresponding to the f-f transition of Tb^<3+> through energy transfer from Ce^<3+> to Tb^<3+> during exciting the d-f transition of Ce^<3+>. We discuss the influence of solvents and surface modifiers of the transparent LaPO_4 : Ce, Tb colloidal solutions on their crystal fields and photoluminescence properties. The transparent LaPO_4 : Ce, Tb colloidal solution was prepared from acetates and trimethyl phosphate in the mixed solvent of water and methanol by autoclave treatment below 150℃, followed by dialysis. According to the observation by transmission electron microscope and the particle size measurement by dynamic light scattering, the particles were less than 10nm in diameter. We found out the method for preparing transparent colloidal solutions of LaPO_4 : Ce, Tb with surface modification, e.g., by the addition of sodium polyphosphate, lauryl phosphate and hydrophilic phosphate modifiers, or by redispersing modified nanoparticles in n-hexane and dimethyl sulfoxide. We verified surface passivation, i.e., capping surface anion vacancies by surface modification based on the quantitative analysis of photoluminescence internal quantum efficiency and the decay curve measurement. On the other hand, we attempted to produce nanoparticle-dispersed resin sheets from the colloidal solution of 〜5nm ZnS : Mn nanoparticles. We also investigated other phosphors with different luminescence colors and the same excitation region as that of ZnS : Mn.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (8 results)

All 2006 2005

All Journal Article (8 results)

  • [Journal Article] Low-temperature wet chemical syntheses of nanocrystal phosphors with surface modification and their characterization2006

    • Author(s)
      T.Isobe
    • Journal Title

      phys. stat. sol. (a) 203巻・11号

      Pages: 2686-2693

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] LaPO_4 : Ce^<3+>,Tb^<3+> ナノ蛍光体の透明な分散液の作製とポリリン酸添加の効果2006

    • Author(s)
      吉川若菜
    • Journal Title

      希土類 48号

      Pages: 124-125

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Low-temperature wet chemical syntheses of nanocrystal phosphors with surface modification and their characterization2006

    • Author(s)
      T.Isobe
    • Journal Title

      phys. stat. sol. (a) 203 (11)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Effects of polyphosphate additive on properties of transparent colloidal solution of LaPO_4 : Ce^<3+>,Tb^<3+> nanophosphor2006

    • Author(s)
      W.Kichikawa
    • Journal Title

      Kidorui (48)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] LaPO_4 : Ce^<3+>, Tb^<3+> ナノ蛍光体の透明な分散液の作製とポリリン酸添加の効果2006

    • Author(s)
      吉川若菜
    • Journal Title

      希土類 48号

      Pages: 124-125

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Effects of surface modification on photoluminescence properties of LaPO_4 : Ce,Tb nano-phosphor synthesized by solvothermal reaction2005

    • Author(s)
      F.Nishimura
    • Journal Title

      Proc. 12th Int. Display Workshops

      Pages: 513-516

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Effects of surface modification on photoluminescence properties of LaPO_4 : Ce, Tb nano-phosphor synthesized by solvothermal reaction2005

    • Author(s)
      F.Nishimura
    • Journal Title

      Proc. 12th Int. Display Workshops

      Pages: 513-516

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Effects of surface modification on photoluminescence properties of LaPO_4:Ce,Tb nano-phosphor synthesized by solvothermal reaction2005

    • Author(s)
      F.Nishimura
    • Journal Title

      Proc. 12th Int. Display Workshops

      Pages: 513-516

    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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