Different fluxes were used to synthesize long persistence phosphors, calcium sulfides activated by Eu2+ and Tm3+, by convenient solid-state method. The phosphor using NH4F as flux has good crystallinity and large particle size, and its stability against water and other atmospheric components is enhanced. Its afterglow is longer and fluorescent intensity is more intense than that of the phosphor using NH4Cl as flux. Their PL intensities varied with time in moist air were measured, no remarkable change was found for those prepared with NH4F flux in contrast with NH4Cl as flux. So using NH4F as flux is a good method to enhance the stability of alkaline earth sulfide.
|Number of pages||4|
|Journal||Journal of Rare Earths|
|Publication status||Published - 2003|
- Chemical stability
- Rare earths