THE BASIC PRINCIPLES OF CEF�?CRYSTAL

The luminescence of nanocrystalline ZnS : Mn2+ in fact displays a short decay time ingredient (∼one hundred ns), but additionally an extended (ms) decay time is noticed. The shorter decay time is ascribed to a defect-connected emission of ZnS, and isn't in the decay in the transition of the Mn2+ impurity. The changeover from the Mn2+ provides a `