長残光アルミン酸ストロンチウム蛍光体における付活剤の役割

概要

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SrAl_2O_4 phosphor excited with fluorescent light or sunlight, has been recently reported to be a long-lasting afterglow (AG) phenomenon. However, the AG mechanism has not been clarified yet. In this study, the long-lasting AG mechanism of SrArAl_2O_4 phosphors doped with Eu and/or Dy, was investigated on the basis of AG, photoluminescence (PL), and thermoluminescence (TL) measurements after UV or X-ray irradiation. A hole trap is presumed to be ascribed to Sr defects, which increases and is stabilized by a charge compensation behavior upon doping Dy ion. An electron trap probably originates from oxygen defects, as produced by firing in a reductive atmosphere. Furthermore, the role of dopants (Eu, Dy ion) on SrAl_2O_4 phosphor co-doped with Eu and Dy ions, was studied by comparing the luminescence (AG and PL) phenomena with the distribution of dopant in SrAl_2O_4 matrix. Eu ion contributed closely to both the AG and PL behaviors, while the Dy ion contributes only to the AG phenomenon.
社団法人日本セラミックス協会の論文
2000-03-01