The luminescence of nanocrystalline ZnS : Mn2+ in fact displays a brief decay time part (∼a hundred ns), but will also a protracted (ms) decay time is observed. The quick decay time is ascribed into a defect-relevant emission of ZnS, and is not in the decay on the changeover from the Mn2+ impurity. The changeover of the Mn2+ has a `standard�?de