The luminescence of nanocrystalline ZnS : Mn2+ in fact exhibits a short decay time part (∼100 ns), but additionally a lengthy (ms) decay time is noticed. The brief decay time is ascribed to a defect-similar emission of ZnS, and is not with the decay on the transition on the Mn2+ impurity. The changeover from the Mn2+ incorporates a `ordinary�?d