Luminescence and temperature sensing properties of Er3+/Yb3+ co-doped 0.70Na0.5Bi0.5TiO3–0.30SrTiO3 ferroelectric ceramics
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Er3+/Yb3+ co-doped 0.70Na0.5Bi0.5TiO3–0.30SrTiO3 (NBT–ST: Er3+/Yb3+) ferroelectric ceramics were synthesized by a solid state reaction method. Under 980 nm radiation excitation, a strong green emission band was obtained which was two-photon up-conversion mechanism. The radiative transition of (4S3/2, 2H11/2) to 4I15/2 of Er3+ indicated a temperature dependent behavior. With a change of the ratio of Er3+/Yb3+, the optimal up-conversion emission was obtained in the NBT–ST:0.005Er3+/0.125Yb3+ ceramics. In a temperature range of 83–643 K, the maximum sensitivity based on fluorescence intensity ratio technique (FIR524/548) was approximately 0.0053 K−1 at 543 K. It indicated that NBT–ST: Er3+/Yb3+ ferroelectric ceramics would be a potential candidate for temperature sensors.
This work was supported by the National Natural Science Foundation of China (Grant No. 51572195).
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