FACTS ABOUT CEF�?CRYSTAL REVEALED

The luminescence of nanocrystalline ZnS : Mn2+ in fact shows a short decay time element (∼a hundred ns), but additionally a protracted (ms) decay time is observed. The quick decay time is ascribed to a defect-connected emission of ZnS, and is not in the decay on the changeover with the Mn2+ impurity. The transition in the Mn2+ has a `usual�?dec