Origin of Ultrafast Component of Photoluminescence Decay in Nanostructures Doped with Transition Metal or Rare-Earth Ions

M. Godlewskia,b, S. Yatsunenkoa, V.Yu. Ivanova, A. Khachapuridzea, K. Świąteka, E.M. Goldysc, M.R. Phillipsd, P.J. Klare and W. Heimbrodte aInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland, bDept. of Mathematics and Natural Sciences, College of Science, Cardinal S. Wyszyński University, Warsaw, Poland cDiv. of Information and Communication Sciences, Macquarie Univ., Sydney, Australia dMicrostructural Analysis Unit, UTS, Sydney, Australia eDept. of Physics and Materials Sciences Center, Phillips-University of Marburg, Renthof 5, 35032 Marburg, Germany

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Received: 22 08 2004;

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.

DOI: 10.12693/APhysPolA.107.65 PACS numbers:71.55.Gs, 76.30.Fc, 76.70.Hb, 78.55.Et