Abstract
ZnS: Sm 3+ single crystals are studied by site selective, time resolved and decay time measurements. It will be shown that beside the direct 4f-4f excitation a slow energy transfer component occurs that can be attributed to the blue self-activated emission in ZnS. Analysing the decay behaviour of various Sm 3+ sites in detail a fast transfer component could be selected which is active for only some of the Sm 3+ sites. The nature of the energy transfer processes will be discussed basing on decay fits and conclusions will be drawn on the differences between Sm 3+ centers, which provides to a better understanding of the luminescence data.
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