Preparation and luminescent properties of MO2 (M=Zr, Hf) with Baddeleyite structure

Takayuki Shimizu, Kyota Uheda, Hirotsugu Takizawa, Tadashi Endo, Masahiko Shimada

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Ti4+ activated zirconia (ZrO2) 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 ZrO2. We first examined the dependence of the luminescent intensity on coordination number for luminescent centers in three phases and temperature prepared phosphors. 0.1% Ti4+ activated monoclinic ZrO2 has the highest emission intensity as compared to SrZrO3:0.1%Ti and tetragonal ZrO2:20%Y2O3, 0.1%Ti. The coordination number of Ti4+ in a monoclinic ZrO2 is 7. Above the calcination temperature of 1200°C, luminescent intensity of the monoclinic ZrO2 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 ZrO2 phosphor. On the basis of these results, we tried to synthesize Ti4+ activated hafnia (HfO2), and measured luminescent properties.

本文言語English
ページ(範囲)175-179
ページ数5
ジャーナルFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
46
2
DOI
出版ステータスPublished - 1999 2月

ASJC Scopus subject areas

  • 機械工学
  • 産業および生産工学
  • 金属および合金
  • 材料化学

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