Energy Transfer Mechanisms in Zn_1−xMn_xSe (0.005 < x < 0.017) Detected by ODMR

Abstract

-, Mn,Se (0.005 < x < 0.027) are presented. Starting from the observation of the resonance of the Mn2+ ground state in the Mn emission and in the SA emission as well, the necessary energy transfer is investigated using excitation dependent ODMR. The spectra, taken for the first time for this system show that the occurrence of the Mn2+ ground-state resonance in the Mn emission can be referred to a spin dependent transfer of optical excitation energy. In the SA emission, on the contrary, a cross relaxation between manganese and donor-acceptor pairs is responsible for the occurrence of the Mn2+ resonance in the ODMR spectra.Es werden ODMR-Untersuchungen an Zn, -,Mn,Se (0,005 < x < 0,017) vorgestellt. Ausgangspunkt dieser Arbeit ist die Beobachtung der Resonanz des Mn2+ Grundzustandes sowohl in der Mn-als auch in der SA-Lumineszenz. Zur Untersuchung des hierzu notwendigen Energietransfers werden erstmals anregungsabhangige ODMR-Messungen an diesem System durchgefuhrt. Die Spektren zeigen, daB das Auftreten der Mn2 +-Grundzustandsresonanz in der Mn-Emission auf einen spinabhangigen Transfer optischer Anregungsenergie zuriickzufiihren ist. In der SA-Emission dagegen ist eine Kreuzrelaxation zwischen Mangan und Donator-Akzeptor Paaren fur das Auftreten der Mn2+-Resonanz in den ODMR-Spektren verantwortlich.

Spin Selection Rules in Radiative and Nonradiative Recombination Processes in Bulk Crystals and in Thin Films of II-VI Compounds

“…Our ODMR investigations confirm thus relaxation of spin selection rules of the Mn 2+ intra-shell PL and allow to relate the effect to spin cross The cross-relaxation mechanism of the ODMR detection was also discussed in Refs. [6,7]. We can thus conclude that for close associates of Mn ions spin cross-relaxation processes are efficient and the PL decay time is shorter than that observed for isolated Mn ions.…”