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The luminescence of nanocrystalline ZnS : Mn2+ certainly shows a short decay time part (∼100 ns), but additionally a long (ms) decay time is noticed. The limited decay time is ascribed to the defect-relevant emission of ZnS, and isn't within the decay in the changeover in the Mn2+ impurity. The changeover of your Mn2+ incorporates a `usual�?dec