Variation of the coordination environment and its effect on the white light emission properties in a Mn-doped ZnO-ZnS
Yan Cheng1, Rui Chen, Haifeng Feng
1Department of Physics and Center of Materials Physics and Chemistry, Beihang University, Beijing 100191, P.R. China. whao@buaa.edu.cn hzxu@buaa.edu.cn.
Abstract:
Mn-doped ZnO-ZnS complex nanocrystals were fabricated through coating of dodecanethiol on Mn-doped ZnO nanocrystals. The relationship between the component of white light emission and the coordination environments of Mn-dopants were experimentally investigated. It was shown that Mn ions mainly formed Mn(3+)O6 octahedra in as prepared Mn-doped ZnO, while the Mn(3+) ions on the surface of ZnO transferred into Mn(2+) ions at the interface between ZnO and ZnS after dodecanethiol coating. The Mn(2+)S4 tetrahedron density and the orange emission intensity increased upon enhancing the dodecanethiol content. These results provide an alternative way to optimize the white emission spectrum from nanocrystals of Mn-doped ZnS-ZnO complex structures through modulation of the coordination environment of Mn ions.
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