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The luminescence of nanocrystalline ZnS : Mn2+ indeed reveals a brief decay time ingredient (∼a hundred ns), but will also a protracted (ms) decay time is noticed. The small decay time is ascribed to your defect-linked emission of ZnS, and isn't within the decay of your changeover on the Mn2+ impurity. The changeover in the Mn2+ includes a `regul