TY - JOUR
T1 - Mechanisms of enhancement of light emission in nanostructures of II-VI compounds doped with manganese
AU - Godlewski, M.
AU - Yatsunenko, S.
AU - Ivanov, V. Yu
AU - Drozdowicz-Tomsia, K.
AU - Goldys, E. M.
AU - Phillips, M. R.
AU - Klar, P. J.
AU - Heimbrodt, W.
PY - 2007
Y1 - 2007
N2 - Intra-shell transitions of transition metal and rare earth ions are parity forbidden processes. For Mn2+ ions this is also a spin forbidden process, i.e., light emission should be inefficient. Surprisingly, it has been reported that in nanostructures of ZnMnS the T14 to A16 intra-shell transition of Mn2+ results in a bright photoluminescence characterized by a short PL decay time. The model of a quantum confined atom was introduced to explain the observed experimental results. It was later claimed that this model is incorrect. Based on the results of our photoluminescence, photoluminescence kinetics, time-resolved photoluminescence, electron spin resonance, and optically detected magnetic resonance investigations, we confirm photoluminescence enhancement and decrease of photoluminescence lifetime and relate these effects to spin dependent magnetic interactions between localized spins of Mn2+ ions and spins/magnetic moments of free carriers. This mechanism is active in both bulk and in low-dimensional structures, but is significantly enhanced in nanostructure samples.
AB - Intra-shell transitions of transition metal and rare earth ions are parity forbidden processes. For Mn2+ ions this is also a spin forbidden process, i.e., light emission should be inefficient. Surprisingly, it has been reported that in nanostructures of ZnMnS the T14 to A16 intra-shell transition of Mn2+ results in a bright photoluminescence characterized by a short PL decay time. The model of a quantum confined atom was introduced to explain the observed experimental results. It was later claimed that this model is incorrect. Based on the results of our photoluminescence, photoluminescence kinetics, time-resolved photoluminescence, electron spin resonance, and optically detected magnetic resonance investigations, we confirm photoluminescence enhancement and decrease of photoluminescence lifetime and relate these effects to spin dependent magnetic interactions between localized spins of Mn2+ ions and spins/magnetic moments of free carriers. This mechanism is active in both bulk and in low-dimensional structures, but is significantly enhanced in nanostructure samples.
UR - http://www.scopus.com/inward/record.url?scp=34247392879&partnerID=8YFLogxK
U2 - 10.1063/1.2718539
DO - 10.1063/1.2718539
M3 - Article
AN - SCOPUS:34247392879
SN - 1063-777X
VL - 33
SP - 192
EP - 196
JO - Low Temperature Physics
JF - Low Temperature Physics
IS - 2
ER -