THE 2-MINUTE RULE FOR CEF�?CRYSTAL

The luminescence of nanocrystalline ZnS : Mn2+ certainly exhibits a short decay time element (∼one hundred ns), but will also a lengthy (ms) decay time is observed. The quick decay time is ascribed to some defect-relevant emission of ZnS, and is not within the decay with the transition of the Mn2+ impurity. The changeover of the Mn2+ has a `usual