Jump to main content
Jump to site search

Issue 12, 2018
Previous Article Next Article

Color selective manipulation in Li2ZnGe3O8:Mn2+ by multiple-cation substitution on different crystal-sites

Author affiliations

Abstract

Controlling the occupation sites of Mn2+ emitters by multiple-cation substitution, the Li2ZnGe3O8:Mn2+ phosphor could be optionally tuned in the green to NIR region. For the Mn2+ single doped Li2ZnGe3O8 phosphor, the tetrahedral coordinated Mn2+ (ZnO4 site) affords a green emission, and the octahedrally coordinated Mn2+ (ZnO6 site) shows an NIR (832 nm) 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 using 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 the group's transition and energy transfer makes 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 the Li2ZnGe3O8:Mn2+ phosphor. When Zn2+ is substituted by bigger ions from Ca to Sr and Ba, the local environments of Mn2+ around ZnO6 are influenced which leads to part of the Mn2+ emitters occupying 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 the Li2ZnGe3O8 host, and provide a method for photoluminescence tuning.

Graphical abstract: Color selective manipulation in Li2ZnGe3O8:Mn2+ by multiple-cation substitution on different crystal-sites

Back to tab navigation

Supplementary files

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., 2018,47, 4293-4300
  •   Request permissions

    Color selective manipulation in Li2ZnGe3O8:Mn2+ by multiple-cation substitution on different crystal-sites

    J. Cheng, P. Li, Z. Wang, Z. Li, M. Tian, C. Wang and Z. Yang, Dalton Trans., 2018, 47, 4293
    DOI: 10.1039/C7DT04552B

Search articles by author

Spotlight

Advertisements