The S a values exhibit an increasing trend with increasing temperature from 298 to 473 K, with a maximum values equal to 0.0143 K −1 in the TCLs case and 0.25 K −1 in the NTCLs case at 473 K.
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Dual-mode optical thermometry based on up- and down-conversion photoluminescence in LiCaLa(MoO<sub>4</sub>)<sub>3</sub>:Er<sup>3+</sup>/Yb<sup>3+</sup> phosphors with high sensitivity.
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