Abstract
Noncontact thermometry based on rare earth-doped phosphors suffer from a single mode of temperature sensing, which leads to lower sensitivity and stability. Herein, a series of Ba1-xSrxLaLiWO6:Er3+/Yb3+ phosphors are prepared with green emission under 980 nm and 380 nm excitation. The luminescence intensities of the samples are effectively enhanced via cation substitution with Sr2+ ions. Such enhancement may be attributed to the more rigid of the crystal structure and the larger band gap in substitution process. The phosphors reveal excellent sensing temperature performances in three modes of upconversion luminescence, downconversion luminescence and fluorescence lifetime, which are systematically investigated within the range of 303 K–573 K depending on the fluorescence intensity ratio and fluorescence lifetime technology. The maximum absolute sensitivity via fluorescence lifetime mode could reach 15.89% μsK-1 and the maximum relative sensitivity via up-conversion luminescence mode could reach 0.98% K-1. All these indicating that Ba1-xSrxLaLiWO6:Er3+/Yb3+ phosphors have enormous utilization prospects for self-calibrating temperature sensors.
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