High temperature sensitivity of manganese-assisted excitonic photoluminescence from inverted core/shell ZnSe:Mn/CdSe nanocrystals

Xue-Feng Yu; Xiao-Niu Peng; Zhen-Qian Chen; Chao Lian; Xiong-Rui Su; Jian-Bo Li; Min Li; Bao-Li Liu; Qu-Quan Wang
March 2010
Applied Physics Letters;3/22/2010, Vol. 96 Issue 12, p123104
Academic Journal
We report efficient and long-lived exciton photoluminescence (PL) from inverted core/shell ZnSe:Mn/CdSe nanocrystals (NCs) at room temperature. Contrary to low temperature-sensitivity of Mn2+ PL from ZnSe:Mn/ZnSe NCs, the Mn2+-assisted excitonic PL from the ZnSe:4%Mn/CdSe NCs exhibits unusually high temperature-sensitivity (-2.4% per K) in the temperature range 298–334 K, which is even higher than that of the pure excitonic PL from the undoped ZnSe/CdSe NCs. Such unexpected temperature-dependence of the Mn2+-assisted excitonic PL is well explained by the deduced exciton rate equation involving the exciton-Mn2+ resonant energy transfer in the ZnSe:Mn/CdSe NCs.


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