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HL: Fachverband Halbleiterphysik
HL 63: II-VI-Compounds
HL 63.4: Talk
Wednesday, March 16, 2011, 16:30–16:45, POT 151
Energy transfer dynamics of the Mn 3d5 luminescence in ZnS:Mn nanostructures — •Uwe Kaiser1, Limei Chen1, Wolfram Heimbrodt1, Sebastian Geburt2, and Carsten Ronning2 — 1Dept. Physics, Philipps-University Marburg, Germany — 2Institute of Solid State Physics, Friedrich-Schiller University, Germany
The energy transfer characteristics of Zn1−xMnxS bulk material can be described by the well known Förster model. For wires and belts in the range of several nanometers, which where studied in this work, this transfer model has to be modified, becuase of the reduced dimensionality. To prove this modified Förster model Zn1−xMnxS samples were prepared, which permited access to the different parameters of the model. The temporal behavior of the internal Mn2+(3d5) luminescence, which enables access to the energy transfer, was measuered over four orders of magnitude. Different concentrations of Manganese from 4· 10−6 % to 4 % were incorporated by ion implantation into ZnS structures of differnet morphologies. For wires as well as for belts an enhancement of the effective dimensionality with the increase of the manganese concentration could be shown. To examine the influence of nonradiative killer centers different attempts for the introduction of defects were studied. With 1) ion implantation of neon as well as 2) different temperature treatements the concentration of killercenters could be controlled. The aim of this work was to prove the validitiy of the modified Förster model for a variety of Zn1−xMnxS nanostructures by the transients of the Mn photoluminescence.