Abstract
In this work, (1−x)(K0.48Na0.52)(Nb0.95Sb0.05)O3−x −xEr0.5(Na0.82K0.18)0.5ZrO3 (x = 0–0.05) ceramics were fabricated by solid-state reaction techniques. The rhombohedral–tetragonal (R–T) phase boundary of the ceramics was identified at 0.04 ≤ x, thus providing an opportunity to investigate the upconversion emission derived from the Er3+ ions at the R–T phase boundary. Under 980 nm laser excitation, the R–T phase ceramics exhibited a strong green emission. In addition, the fluorescence intensity ratios of green emissions at 530 nm and 550 nm were investigated in a temperature range of 180–510 K, and maximum sensing sensitivity was found to be 0.0037 K−1. The results indicate that Er3+-doped ceramics with R–T phase boundaries can be applied to new multifunctional electro-optical temperature sensors. Laser excitation heating effects were also observed in detail.
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