バデライト型構造をもつMO_2(M=Zr, Hf)の合成及び発光特性 Preparation and Luminescent Properties of MO_2(M=Zr, Hf)with Baddeleyite Structure

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Ti<SUP>4+</SUP> activated zirconia (ZrO<SUB>2</SUB>) has been known as a phosphor, which has a broad emission band peaking at 490nm and an afterglow lasting for several minutes. The visually detectable emission due to afterglow would be much improved by means of increasing a fluorescent intensity or forming traps that have suitable depth below a conduction band of ZrO<SUB>2</SUB>. We first examined the dependence of the luminescent intensity on coordination number for luminescent centers in three phases and temperature prepared phosphors. 0.1% Ti<SUP>4+</SUP> activated monoclinic ZrO<SUB>2</SUB> has the highest emission intensity as compared to SrZrO<SUB>3</SUB>:0.1%Ti and tetragonal ZrO<SUB>2</SUB>:20%Y<SUB>2</SUB>O<SUB>3</SUB>, 0.1%Ti. The coordination number of Ti<SUP>4+</SUP> in a monoclinic ZrO<SUB>2</SUB> is 7. Above the calcination temperature of 1200°C, luminescent intensity of the monoclinic ZrO<SUB>2</SUB> phosphor sharply increased through phase transition. It was also observed that the persistence of afterglow depended upon the concentration of the traps created at high temperature. The traps were investigated by measuring thermoluminescence spectra. We discuss a mechanism of afterglow for the monoclinic ZrO<SUB>2</SUB> phosphor. On the basis of these results, we tried to synthesize Ti<SUP>4+</SUP> activated hafnia (HfO<SUB>2</SUB>), and measured luminescent properties.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 46(2), 175-179, 1999-02-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002261872
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4655563
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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