Abstract
In this study, NaYTiO4: Yb/Tm phosphors with different concentrations of Yb3+ and Tm3+ ions were synthesized by conventional solid-state reaction. Upon a 980 nm laser excitation, the up-conversion luminescence properties in a wide temperature range (303–823 K) were investigated. By employing the fluorescence intensity ratio (FIR) techniques based on the robust near-infrared emissions of thermally coupled 3F2,3/3H4 energy levels and 3H4(1)/3H4(2) Stark energy levels, the calculated absolute sensitivity (Sa), relative sensitivity (Sr), and temperature uncertainty (δT) values demonstrated good temperature sensing properties. For the 3F2,3/3H4 energy levels, the maximum Sr and minimum δT values are 1.04% K−1 and 0.010 K at 463 K, respectively. Moreover, the maximum Sa is 0.32 × 10−3 K−1 at 823 K. In addition, the thermally coupled 3H4 Stark energy levels present the maximum Sa, Sr and the minimum δT are 0.88 × 10−3 K−1, 0.60% K−1 and 3.17 K at 303 K, respectively. Besides, due to the ratio of blue to red emission varying with elevated temperature, the NaYTiO4: Yb/Tm phosphors are expected to be applied as an intuitive high-temperature indicator.
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