Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 19: Quantum dots and wires: Optical properties II

HL 19.6: Vortrag

Dienstag, 28. März 2006, 18:30–18:45, HSZ 01

Size dependence of the dynamics of the Mn 3d⁵ luminescence in wire-like arrangements of (Zn,Mn)S nanoparticles — •L. Chen¹, P.J. Klar¹, W. Heimbrodt¹, F.J. Brieler², and M. Fröba² — ¹Dept. Physics and WZMW, Philipps-University of Marburg, Germany — ²Institute of Inorganic and Analytical Chemistry, Justus-Liebig-University of Gießen, Germany

(Zn,Mn)S nanoparticles with Mn concentrations ranging from 1% to 30% and in a wire-like arrangement were formed inside mesoporous SiO₂ matrices of various pore diameters. The nanoparticles were characterised using photoluminescence and excitation spectroscopy. It is found, that the Mn²⁺ ions are incorporated on cation lattice sites replacing Zn. The decay times of the internal Mn²⁺ (3d⁵) luminescence are studied in detail by time resolved spectroscopy over more than 5 orders of magnitude in intensity. A concentration and a remarkable size dependence of the time behaviour has been observed indicating a geometry dependence of the energy-transfer processes within the Mn system.