Ultra-sensitive low-temperature thermometer regulated by the crystal field strength. Issue 5 (1st March 2023)

• Record Type: Journal Article
• Authors: Li, Rui; Li, Panlai; Wei, Guohui; Li, Jiehong; Shi, Yawei; Wang, Ye; He, Shaoxuan; Yang, Yuanbo; Ding, Wenge; Wang, Zhijun
• Is Part Of: Ceramics international. Volume 49:Issue 5(2023)
• Page Start: 7913
• Page End: 7919
• Publication Date: 2023-03-01
• Subjects: Luminescence ratiometric thermometry -- Cr3+ -- Cryogenic temperature; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.10.298
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Developing novel optical thermometry with ultrahigh relative sensitivity and temperature resolution has become a cutting-edge topic. For this purpose, under obeying Boltzmann distribution, a series of Li2 Zn0.9992-x Ax Ge3-y By O8 :0.08% Cr 3+ (B= Sc 3+, In 3+, A = Si 4+ ) phosphors were studied, which the luminescence intensity ratio between the transition of 4 T2g → 4 A2g emission and the R line based on thermally coupled energy levels constitutes a temperature sensing work with a relative sensitivity of 9.46% K −1, 9.73% K −1, and 10.38% K −1, respectively. It is worth mentioning that the luminescence intensity of the R line (peak 1) increases significantly with the increase of temperature, while the transition of 4 T2g → 4 A2g (peak 2) with high intensity at low temperature gradually quenching, and this opposite trend is an important advantage for the design of excellent thermometers. Compared the best relative sensitivity of Li2 Zn0.9992-x Ax Ge3-y By O8 :0.08%Cr 3+ (B= Sc 3+, In 3+, A = Si 4+ ) with the crystal field Dq /B, it can be concluded that relative sensitivity increasing gradually with decreasing the intensity of crystal field. Finally, by testing the stability of the sample at 50 K, a thermal resolution of 0.082 K, 0.080 K and 0.077 K was obtained, respectively, which is one of the best thermal resolutions so far, while the repeatability of the sample stability at 50 K and 300 K cycles was higher than 99%. Our work is expected to provide guiding insights for optimizing the sensitivity of Cr 3+ -based luminescence intensity ratio thermometers. Graphical abstract: Image 1