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The luminescence of nanocrystalline ZnS : Mn2+ certainly exhibits a short decay time component (∼100 ns), but also a long (ms) decay time is noticed. The short decay time is ascribed to your defect-relevant emission of ZnS, and is not in the decay from the transition of your Mn2+ impurity. The changeover on the Mn2+ incorporates a `typical�?dec