Issue 27, 2019

Double perovskite A2LaNbO6:Mn4+,Eu3+ (A = Ba, Ca) phosphors: potential applications in optical temperature sensing

Abstract

Recently, much attention has been paid to Mn4+-doped phosphors due to their strong deep-red emissions which are in demand in white light-emitting diodes. However, a key challenge for the commercialization of Mn4+-doped phosphors is their low thermal stability caused by the thermal quenching of Mn4+ luminescence. Herein, a strategy of optical temperature sensing has been developed by specifically utilizing thermal quenching to explore the potential applications of Mn4+-doped phosphors in optical temperature sensing. In this work, we report two kinds of double perovskite type phosphors, Ba2LaNbO6 (BLN) and Ca2LaNbO6 (CLN), co-doped with Mn4+ and Eu3+. Through the study of temperature-dependent spectra in a large temperature range of 298–498 K, Mn4+ and Eu3+ yield different trends where the fluorescence intensity of Mn4+ ions decreases much more rapidly compared to that of Eu3+ ions as the temperature increases. Accordingly, based on the fluorescence intensity ratio (FIR) of the luminescence of Mn4+ and Eu3+, the optimal relative sensitivity of temperature sensing in the BLN and CLN matrices could reach 2.08% K−1 and 1.51% K−1, respectively. Finally, the application potential of Mn4+-doped phosphors in temperature sensing is confirmed by analyzing different temperature sensing results in the two matrices.

Graphical abstract: Double perovskite A2LaNbO6:Mn4+,Eu3+ (A = Ba, Ca) phosphors: potential applications in optical temperature sensing

Supplementary files

Article information

Article type
Paper
Submitted
10 Apr 2019
Accepted
28 May 2019
First published
01 Jun 2019

Dalton Trans., 2019,48, 10062-10069

Double perovskite A2LaNbO6:Mn4+,Eu3+ (A = Ba, Ca) phosphors: potential applications in optical temperature sensing

P. Wang, J. Mao, L. Zhao, B. Jiang, C. Xie, Y. Lin, F. Chi, M. Yin and Y. Chen, Dalton Trans., 2019, 48, 10062 DOI: 10.1039/C9DT01524H

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