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Kentarou Mori 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.S1
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.