A REVIEW OF CEF�?CRYSTAL

The luminescence of nanocrystalline ZnS : Mn2+ in truth displays a brief decay time component (∼a hundred ns), but additionally a protracted (ms) decay time is noticed. The brief decay time is ascribed into a defect-similar emission of ZnS, and is not with the decay with the changeover with the Mn2+ impurity. The transition of the Mn2+ contains a