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Preparation of long-lasting transparent glass-ceramic phosphor

Research Project

Project/Area Number 11555167
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Inorganic materials/Physical properties
Research InstitutionOKAYAMA UNIVERSITY

Principal Investigator

MIURA Yoshinari  Faculty of Environ. Sci. & Tech., Department of Environ. Chem. & Mater., Professor, 環境理工学部, 教授 (80032952)

Co-Investigator(Kenkyū-buntansha) 傳 傑  株式会社オハラR&Dセンター(H11年度のみ参加), 主任研究員
NANBA Tokuro  Faculty Environ Sci. & Tech., Department of Environ Chem & Mater., Ass. Professor, 環境理工学部, 助教授 (80218073)
JIE Fu  Ohara Inc. R & D Center Reseacher
傅 杰  (株)オハラ, R&Dセンター, 主任研究員
Project Period (FY) 1999 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥11,400,000 (Direct Cost: ¥11,400,000)
Fiscal Year 2002: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2001: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2000: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1999: ¥4,200,000 (Direct Cost: ¥4,200,000)
Keywordslong-lasting phosphors / transparent glass-ceramics / alkaline-earth aluminum oxides / akermanite crystals / rare earth ions / crystallizing heat-treatment at reducing condition / glass-melting at reducing condition / ultrasonic surface treatment (UST)
Research Abstract

The preparation of the transparent glass-ceramics with long lasting phosphorescence (LLP) was tried by precipitation of crystals from glassy materials by means of various experimental methods. The glass-ceramics containing calcium aluminate crystals co-doped with Eu^<2+> and Nd^<3+> or akermanite (strontium magnesium silicate) type crystals co-doped with Eu^<2+> and Dy^<3+>. The glass in the system 45CaO・45Al_2O_3・10SiO_2 (mol%) containing 0.5Eu_2O_3+1Nd_2O_3 showed very weak LLP property due to glassy state even though Eu ions were effectively reduced to Eu^<2+> ion state by melting the glass with reducing agents like sugar or graphite. Therefore to keep a certain crystal state is necessity to excellent LLP property. The effects of ultrasonic surface treatment (UST) on the crystallization behavior and optical emission properties were investigated for the transparent glass-ceramics prepared from calcium aluminosilicate glasses co-doped with Eu^<2+> and Nd^<3+>. The glass-ceramics A wer … More e prepared by sintering a glass 45CaO・45Al_2O_3・10SiO_2 (mol%) containing O.5Eu_2O_3+1Nd_2O_3 under a 2%H_2+98%Ar reducing atmosphere. In the glass-ceramics A, three crystalline phases, CaAl_2O_4(CA), CaAl_4O_7(CA2) and Ca_2Al_2SiO_7(CAS) were commonly confirmed by X-ray diffraction. No drastic change in the amount of the precipitated crystalline phases was observed even in the case using UST of CA powders. It was suggested that the optical emission properties of the glass-ceramics A was responsible for the CA2 crystals. The glass-ceramics B were also prepared from a 51CaO・42Al_2O_3・7SiO_2 glass. The CA crystals were separately precipitated in the glass-ceramics B. In particular, a large amount of CA was successfully produced by stirring the UST suspension to prevent the sedimentation of the UST particles. The glass-ceramic B so-prepared showed strong photoluminescence but weak phosphorescence compared with other glass-ceramics B, indicating that the photoluminescence and phosphorescence were originated in different electron-trapping levels. The amount of the trap levels associated with the long lasting phosphorescence, such as oxygen vacancies, was probably small in the glass-ceramic B prepared with the stirring UST. When the glasses were melted with reducing agent like sugar and partially crystallized under a reducing atmosphere glass-ceramics showed excellent LLP properties. The glass-ceramics with LLP precipitated akermanite type crystals co-doped with Eu^<2+> and Dy^<3+> were also obtained by melting and crystallizing under reducing conditions. Less

Report

(5 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Z.Yao, Y.Ding, T.Nanba, Y.Miura: "Photoluminescence increase of Er^<3+> in Na_2O-Nb_2O_5SiO_2 glasses after crystallization"Journal of Non-Crystalline Solids. 259. 45-50 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Jie Fu: "Long-Lasting Phosphorescence of Transparent Surface-Crystallized Glass-Ceramics"Journal of American Ceramic Society. 83. 2613-2615 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 井上輝英, 中島瑞穂, 難波徳郎, 三浦嘉也: "長残光性透明ガラスセラミックスの作製における超音波前処理効果"岡山大学環境理工学部研究報告. 7. 113-118 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Z. Yao, Y. Ding, T. Nanba and Y. Miura: "Photoluminescence increase of Er^<3+> in Na_2O-Nb_2O_5-SiO_2 glasses after crystallization"Journal of Non-Crystalline Solids. 259. 45-50 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Jie Fu: "Long-Lasting Phosphorescence of Transparent Surface-Crystallized Glass-Ceramics"Journal of American Ceramic Society. 83. 2613-2615 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Inoue, M. Nakashima, T. Nanba and Y. Miura: "Effects of ultrasonic treatment on the preparation of transparent glass-ceramic phosphor"Journal of the Faculty of Environmental Science and Technology Okayama University. 7. 113-118 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 中島瑞穂, 福田淳, 難波徳郎, 三浦嘉也: "長残光性透明ガラスセラミックスの作製"セラミックス基礎科学討論会要旨集. 41. 328-329 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 井上輝英, 中島瑞穂, 難波徳郎, 三浦嘉也: "長残光性透明ガラスセラミックスの作製における超音波前処理効果"岡山大学環境理工学部研究報告. 第7巻, 第1号. 113-118 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Jie Fu: "Long-Lasting Phosphorescence of Transparent Surface-Crystallized Glass-Ceramics"J.Am.Ceram.Soc. 83卷,10号. 2613-2615 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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