Journal
JOURNAL OF RARE EARTHS
Volume 39, Issue 12, Pages 1512-1519Publisher
ELSEVIER
DOI: 10.1016/j.jre.2021.06.007
Keywords
Up-conversion luminescence; Optical temperature sensor; Fluorescence intensity ratio; Rare earths
Categories
Funding
- National Natural Science Foundation of China [11974315]
- Guangdong Science and Technology Innovation Strategy Foundation of China [20190310]
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The paper presents a novel Y4GeO8:Er3+,Yb3+ phosphor synthesized via conventional solid-state reaction, and explores its properties as an optical thermometer showing excellent temperature sensing performances. The phosphor exhibits high temperature resolution and sensitivity, making it a potential candidate for thermometry devices.
Herein, we reported novel Y4GeO8:Er3+,Yb3+ phosphors elaborated via conventional solid-state reaction, and we further explored their properties as optical thermometer by using fluorescence intensity ratio (FIR) method complemented by detailed analysis on crystal structure, up-conversion luminescence and energy transfer from Yb3+ to Er3+. Upon 980 nm laser excitation, Y4GeO8:Er3+,Yb3+ phosphors present 525, 547 and 659 nm emission bands assigned to the characteristic transitions of Er3+. Furthermore, Y4GeO8:Er3+,Yb3+ samples show outstanding temperature sensing performances. To be specific, the minimal temperature resolution is 0.03 K (303 K), and the relative sensitivity of FIR can be up to 1.152%/K (303 K). Hence, Y4GeO8:Er3+,Yb3+ phosphors can be possible candidates for thermometry devices. (c) 2021 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.
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