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HL: Halbleiterphysik

HL 12: Poster I

HL 12.70: Poster

Montag, 8. März 2004, 16:30–19:00, Poster A

Energy transfer from band states into the Mn 3d⁵ shell of (Zn,Mn)S nanowires — •J. Kampmann¹, L. Chen¹, P.J. Klar¹, W. Heimbrodt¹, F.J. Brieler², and M. Fröba² — ¹FB Physik und WZMW, Philipps-Universität, Marburg — ²Institut für Anorganische and Analytische Chemie, Justus-Liebig Universität, Gießen

The energy transfer from the band states into the Mn 3d⁵ shell in (II,Mn)VI wide-gap diluted magnetic semiconductors is a well known feature of the bulk compounds. As a result the luminescence properties of these materials are dominated by the yellow luminescence band of the lowest transition in the Mn 3d⁵ shell between the ⁴T₁ (S=3/2) first excited state to the ⁶A₁ (S=5/2) ground state. The energy transfer between the two subsystems, extended band states and Mn 3d⁵ shell, is a Dexter-Förster like process. The mechanisms for overcoming the violation of the spin selection rule Δ S=0 are still under debate. We present first studies of the luminescence and transfer dynamics of the yellow Mn-luminescence in Zn_1−xMn_xS nanowires with diameters ranging from 3 to 9 nm and x between 0.01 and 0.3.