Issue 40, 2023

Insights into luminescence thermal quenching of Mn4+-doped BaLa(Na/Li)(W/Te)O6 double perovskite red phosphors

Abstract

Mn4+ activated red-emitting luminescent materials often suffer from severe temperature quenching. To get insight into the nature of this process and achieve a better thermal stability, a series of BaLa(Na/Li)WO6:Mn4+ and BaLaLi(W/Te)O6:Mn4+ far-red emitting luminescent materials have been synthesized using a traditional high-temperature solid-state reaction approach. The samples have been thoroughly characterized by means of XRD, SEM, temperature-dependent photoluminescence spectroscopy and decay kinetics measurements. It is shown that substitution reactions of Na+ and W6+ by Li+ and Te6+, respectively, increase the energy gap between 2Eg and 4T2g states of Mn4+ due to the blue shift of the Mn4+ 4T2g excitation band, resulting in noticeable improvement of the thermal stability. The potential mechanism responsible for this observation is proposed. The work demonstrates an effective approach for optimizing luminescence thermal stability of Mn4+-doped inorganic oxide phosphors.

Graphical abstract: Insights into luminescence thermal quenching of Mn4+-doped BaLa(Na/Li)(W/Te)O6 double perovskite red phosphors

  • This article is part of the themed collection: #MyFirstJMCC

Supplementary files

Article information

Article type
Paper
Submitted
25 Eka. 2023
Accepted
11 Ira. 2023
First published
11 Ira. 2023

J. Mater. Chem. C, 2023,11, 13865-13873

Insights into luminescence thermal quenching of Mn4+-doped BaLa(Na/Li)(W/Te)O6 double perovskite red phosphors

M. Zhai, Q. Shi, K. V. Ivanovskikh, J. Qiao, L. Wang, H. Guo, P. Huang and X. Wang, J. Mater. Chem. C, 2023, 11, 13865 DOI: 10.1039/D3TC02216A

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