DETAILED NOTES ON CEF�?CRYSTAL

The luminescence of nanocrystalline ZnS : Mn2+ certainly displays a short decay time element (∼one hundred ns), but in addition a protracted (ms) decay time is observed. The brief decay time is ascribed to a defect-related emission of ZnS, and is not in the decay of your transition of the Mn2+ impurity. The changeover on the Mn2+ features a `usua