THE 2-MINUTE RULE FOR CEF�?CRYSTAL

The luminescence of nanocrystalline ZnS : Mn2+ in truth exhibits a brief decay time component (∼a hundred ns), but additionally a lengthy (ms) decay time is observed. The small decay time is ascribed to some defect-linked emission of ZnS, and is not from the decay with the transition with the Mn2+ impurity. The changeover on the Mn2+ contains a `