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Color Selective Manipulation in Li2ZnGe3O8:Mn2+ by multiple-cations substitution on different crystal-sites

Abstract

Controlling the occupation sites of Mn2+ emitters by multiple-cations substitution, the Li2ZnGe3O8:Mn2+ phosphor could be optionally tuned in the green to NIR region. For Mn2+ single doped Li2ZnGe3O8 phosphor, the tetrahedral coordinated Mn2+ (ZnO4 site) gives a green emission, and the octahedrally coordinated Mn2+ (ZnO6 site) shows a NIR (832nm) emission. Interestingly, the Li2ZnGe3O8 host has three cation crystallographic sites, in which the octahedrally coordinated Mn2+ could exhibit a red emission by occupying GeO6 sites. The different luminescence centers for Mn2+ have been demonstrated by time-resolved emission spectra (TRES), excitation spectra and the decay curves. However, how to selectively regulate these fluorescence-emissions corresponding to the different occupation sites is critical. In this paper, a common effect between group’s transition and energy transfer make it possible to enhance the green emission (ZnO4 site) continuously and to restrain the NIR emission (ZnO6 site) through increasing the Zn/Li ratio in Li2ZnGe3O8:Mn2+ phosphor. When Zn2+ is substituted by bigger ions from Ca to Sr and Ba, the local environment of Mn2+ around ZnO6 are influenced which lead to part of the Mn2+ emitters occupy the Ge4+ site, and it has the most enhanced effect on the Mn red-emission(GeO6 site). In general, we show that the spectral property of Mn2+ in different occupation sites could be efficiently regulated within Li2ZnGe3O8 host, and provide a method for photoluminescence tuning.

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Publication details

The article was received on 03 Dec 2017, accepted on 08 Feb 2018 and first published on 08 Feb 2018


Article type: Paper
DOI: 10.1039/C7DT04552B
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Color Selective Manipulation in Li2ZnGe3O8:Mn2+ by multiple-cations substitution on different crystal-sites

    J. Cheng, P. Li, Z. Wang, Z. Li, M. Tian, C. Wang and Z. Yang, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C7DT04552B

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