Origin of ultrafast component of photoluminescence decay in nanostructures doped with transition metal or rare-earth ions

Publication Type:
Journal Article
Acta Physica Polonica A, 2005, 107 (1), pp. 65 - 74
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Bulk samples, layers, quantum well, and quantum dot structures of II-Mn-VI samples all show coexistence of slow and fast components of Mn2+ photoluminescence decay. Thus, fast photoluminescence decay cannot be related to low dimensionality of a host material. This also means that the model of the so-called quantum confined atom is incorrect. Based on the results of time-resolved photoluminescence and optically detected magnetic resonance investigations we relate the observed lifetime decrease in Mn2+ intra-shell transition to spin dependent magnetic interactions between localized spins of Mn2+ ions and between Mn2+ ions and spins/magnetic moments of free carriers. The latter mechanism is enhanced in nanostructures.
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