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The luminescence of nanocrystalline ZnS : Mn2+ in fact displays a brief decay time part (∼a hundred ns), but in addition a long (ms) decay time is noticed. The small decay time is ascribed to your defect-related emission of ZnS, and is not through the decay in the transition in the Mn2+ impurity. The transition of the Mn2+ has a `standard�?deca