Mechanism of Photostimulated Luminescence Process in BaFBr:Eu<sup>2+</sup>Phosphors

  • Iwabuchi Yasuo
    Miyanodai Technology Development Center, Fuji Photo Film Co., Ltd., Miyanodai, Kaisei, Kanagawa 258
  • Mori Nobufumi
    Miyanodai Technology Development Center, Fuji Photo Film Co., Ltd., Miyanodai, Kaisei, Kanagawa 258
  • Takahashi Kenji
    Miyanodai Technology Development Center, Fuji Photo Film Co., Ltd., Miyanodai, Kaisei, Kanagawa 258
  • Matsuda Terumi
    Miyanodai Technology Development Center, Fuji Photo Film Co., Ltd., Miyanodai, Kaisei, Kanagawa 258
  • Shionoya Shigeo
    Department of Electronics, Tokyo Engineering University, Katakura, Hachioji, Tokyo 192

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タイトル別名
  • Mechanism of Photostimulated Luminescence Process in BaFBr:Eu2+ Phosphors.

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The formation of photostimulated luminescence (PSL) centers in BaFBr:Eu2+ single-crystal phosphors is studied in the 5-9 eV vacuum ultraviolet region. The centers are efficiently formed by the Eu2+ photoionization absorption at 6.6 eV. The PSL excitation spectrum after the photoionization excitation is almost the same as that after X-ray excitation. Photoconductivity is generated in the PSL process after the photoionization excitation. These results present further confirmation of the PSL mechanism of Takahashi et al. [J. Lumin. 31 & 32 (1984) 266]. The numerical analysis of the dependence of the PSL intensity on X-ray excitation intensity, assuming bimolecular kinetics in accord with this mechanism, gives the linear dependence over a very wide range of X-ray intensity under the practical conditions in the PSL applications. Thus the mechanism of Takahashi et al. is definitely established.

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