Thermally boosted upconversion and downshifting luminescence in Sc2(MoO4)3:Yb/Er with two-dimensional negative thermal expansion

Jinsheng Liao (), Minghua Wang, Fulin Lin, Zhuo Han, Biao Fu, Datao Tu (), Xueyuan Chen (), Bao Qiu () and He-Rui Wen
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Jinsheng Liao: Jiangxi University of Science and Technology
Minghua Wang: Jiangxi University of Science and Technology
Fulin Lin: Chinese Academy of Sciences
Zhuo Han: Jiangxi University of Science and Technology
Biao Fu: Jiangxi University of Science and Technology
Datao Tu: Chinese Academy of Sciences
Xueyuan Chen: Chinese Academy of Sciences
Bao Qiu: Chinese Academy of Sciences
He-Rui Wen: Jiangxi University of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Rare earth (RE3+)-doped phosphors generally suffer from thermal quenching, in which their photoluminescence (PL) intensities decrease at high temperatures. Herein, we report a class of unique two-dimensional negative-thermal-expansion phosphor of Sc2(MoO4)3:Yb/Er. By virtue of the reduced distances between sensitizers and emitters as well as confined energy migration with increasing the temperature, a 45-fold enhancement of green upconversion (UC) luminescence and a 450-fold enhancement of near-infrared downshifting (DS) luminescence of Er3+ are achieved upon raising the temperature from 298 to 773 K. The thermally boosted UC and DS luminescence mechanism is systematically investigated through in situ temperature-dependent Raman spectroscopy, synchrotron X-ray diffraction and PL dynamics. Moreover, the luminescence lifetime of 4I13/2 of Er3+ in Sc2(MoO4)3:Yb/Er displays a strong temperature dependence, enabling luminescence thermometry with the highest relative sensitivity of 12.3%/K at 298 K and low temperature uncertainty of 0.11 K at 623 K. These findings may gain a vital insight into the design of negative-thermal-expansion RE3+-doped phosphors for versatile applications.

Date: 2022
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DOI: 10.1038/s41467-022-29784-6

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