Articles
  • Effect of initial Eu/Ca atomic ratio on the afterglow properties of red-emitting CaS:Eu2+, Pr3+ phosphors 
  • Kentarou Mori, Yoshiyuki Kojima* and Nobuyuki Nishimiya
  • Department of Materials and Applied Chemistry, Faculty of Science and Technology, Nihon University, Tokyo 101-8308, Japan
Abstract
The afterglow time of typical red-emitting phosphors is much shorter than those of green-or blue-emitting phosphors which afterglow time were longer than 1000 min. This study reports on the effect of initial Eu/Ca atomic ratio on the afterglow properties of a red-emitting CaS: Li+, Eu2+, Pr3+ phosphor. The resulting phosphor exhibited red-emission at 645 nm originating from Eu2+ ions upon visible light irradiation, and gave some afterglow after visible light irradiation. The afterglow time was affected by initial Eu/Ca atomic ratio. Trap depth of TL peak was calculated from Hoogenstraaten method. The afterglow time of CaS: Li+, Eu2+, Pr3+ phosphor was changed by the 1st trap depth change due to initial Eu/Ca atomic ratio.

Keywords: Red afterglow; Calcium sulfide; Visible light; Thermoluminescence; Trap depth

This Article

  • 2013; 14(S1): 57-59

    Published on Mar 31, 2013

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