1. KNN-based optical temperature sensing ceramics integrating negative thermal quenching and photochromic self-recovery behavior.
- Author
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Chen, Yan, Yu, Fangyuan, Zhong, Shiqi, Deng, Lixiang, Wu, Xiao, Lin, Cong, Zhao, Chunlin, Gao, Min, Lin, Tengfei, Luo, Laihui, and Zhang, Qiwei
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PHOTOCHROMIC materials , *RARE earth metals , *CERAMICS , *TRANSPARENT ceramics , *TEMPERATURE sensors , *HIGH temperatures , *DOPING agents (Chemistry) - Abstract
Rare-earth ion (RE3+) doped materials with upconversion luminescence and photochromic (PC) effect have received widespread attention, but thermal quenching (TQ) at high temperature and energy-demanding PC recovery processes limit their practical applications. Herein, lanthanide ion doped (K 0.5 Nb 0.5)NbO 3 (KNN) based translucent ceramics were prepared, in which Tm3+/Yb3+ co-doped one displays optical versatility for potential applications in temperature sensors and anti-counterfeiting. By utilizing the large energy mismatch between Tm3+ and Yb3+, negative thermal quenching (NTQ) feature was achieved with the maximum relative sensitivity of 2.54 %K−1 at 213 K. Furthermore, by constructing appropriate intermediate traps, the ceramic exhibits a rapid PC self-recovery process within 30 min without external stimulation. The bifunctional specialty can expand the applications of KNN-based ceramics in optical area. [Display omitted] • Optical bi-functionality in Ln3+ co-doped KNN ceramics were achieved. • Negative thermal quenching (NTQ) was observed in 1 Tm-4Yb-KNN ceramic. • The 1 Tm-4Yb-KNN ceramic exhibits ∼40.3% transmittance in the visible region. • UCPL emission intensity could self-recover in 30 min without external stimulation. • Temperature sensing method was proposed based on both TQ and NTQ ways. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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