AN UNBIASED VIEW OF CEF�?CRYSTAL

The luminescence of nanocrystalline ZnS : Mn2+ in fact demonstrates a short decay time ingredient (∼one hundred ns), but also a protracted (ms) decay time is noticed. The limited decay time is ascribed to a defect-associated emission of ZnS, and is not within the decay of the changeover from the Mn2+ impurity. The changeover in the Mn2+ provides