THE DEFINITIVE GUIDE TO CEF�?CRYSTAL

The luminescence of nanocrystalline ZnS : Mn2+ indeed shows a short decay time ingredient (∼one hundred ns), but in addition a long (ms) decay time is observed. The short decay time is ascribed to the defect-relevant emission of ZnS, and is not from your decay of the transition with the Mn2+ impurity. The changeover from the Mn2+ includes a `regu