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Issue 4, 2018

Luminescence properties and the thermal quenching mechanism of Mn2+ doped Zn2GeO4 long persistent phosphors

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Abstract

Cation doped Zn2GeO4 materials have been intensively explored owing to their excellent performance in photocatalysts, optoelectronic devices and white light-emitting diodes. However, the luminescence process and thermal quenching arising during the optical excitation of these materials are yet to be clarified. The pure and 2% Mn2+ doped Zn2GeO4 phosphors were prepared via the high temperature solid state reaction. The phosphors were characterized by X-ray diffraction, ultraviolet-visible diffuse reflectance spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy and afterglow decay curves. The thermal stability and quenching of Mn2+ luminescence were explained by the temperature dependence of photoluminescence spectroscopy and the configuration coordinate diagram. The thermal quenching of Mn2+ luminescence is mainly due to the delocalization of excited electrons from the excited state to the ionized state. Two kinds of origination of the O 1s peak were revealed by X-ray photoelectron spectroscopy. A model is constructed to interpret all the photoluminescence and long persistent luminescence of the Mn2+ doped Zn2GeO4. This may contribute to the understanding and optimization of luminescence properties for other Mn2+ doped inorganic phosphors.

Graphical abstract: Luminescence properties and the thermal quenching mechanism of Mn2+ doped Zn2GeO4 long persistent phosphors

Article information


Submitted
17 Oct 2017
Accepted
11 Dec 2017
First published
12 Dec 2017

Dalton Trans., 2018,47, 1303-1311
Article type
Paper

Luminescence properties and the thermal quenching mechanism of Mn2+ doped Zn2GeO4 long persistent phosphors

F. Chi, X. Wei, B. Jiang, Y. Chen, C. Duan and M. Yin, Dalton Trans., 2018, 47, 1303 DOI: 10.1039/C7DT03906A

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