Improved photoluminescence and multi-mode optical thermometry of Er3+/Yb3+ co-doped (Ba,Sr)3Lu4O9 phosphors

• Published in: Ceramics international 2022-02, Vol.48 (3), p.3051-3058
• Main Authors: Hu, Jiaxuan, Zhang, Xing, Zheng, Haihong, Lu, Fumin, Peng, Xiusha, Wei, Rongfei, Hu, Fangfang, Guo, Hai
• Format: Article
• Language: English
• Subjects: Fluorescence intensity ratio; Optical thermometry; Phosphors; Sensitively; Up-conversion luminescence
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2021.10.080

Contactless optical thermometers have attracted extensive attentions for applications in scientific research and technological fields due to their apparent advantages. Herein, a novel sequence of Ba3-xSrxLu4O9 (B3-xSxLO):Er3+/Yb3+ phosphors were successfully prepared to investigate the temperature sensing property. By establishing energy transfer from Yb3+ to Er3+ and regulating the local lattice environment, up-conversion luminescence of Er3+ is dramatically improved when excited by 980 nm laser. This can effectively promote signal-noise ratio and reduce the errors in temperature detection. Furthermore, a multi-mode optical thermometry, which includes the fluorescence intensity ratio (FIR) from two thermally coupled levels of 2H11/2/4S3/2, FIR based on non-thermally coupled system of 2H11/2/4F9/2 and fluorescence lifetime of 4S3/2 state of Er3+, was explored systematically. The fabricated samples exhibit the superior temperature measurement performances containing wide temperature-sensing range, superior signal discriminability, high sensitivity and favorable repeatability, indicative of the enormous utilization prospects of B3-xSxLO:Er3+/Yb3+ for thermometry.