ABOUT CEF�?CRYSTAL

The luminescence of nanocrystalline ZnS : Mn2+ indeed shows a brief decay time element (∼one hundred ns), and also an extended (ms) decay time is noticed. The limited decay time is ascribed to a defect-relevant emission of ZnS, and is not through the decay with the changeover in the Mn2+ impurity. The changeover of the Mn2+ provides a `regular�