The luminescence of nanocrystalline ZnS : Mn2+ certainly displays a brief decay time part (?100 ns), but will also an extended (ms) decay time is noticed. The brief decay time is ascribed to the defect-linked emission of ZnS, and isn't in the decay with the changeover of the Mn2+ impurity. The transition on the Mn2+ provides a `normal??decay of abo