Abstract
In this paper, Tm3+/Yb3+ codoped SrWO4 materials for optical thermometry is synthetized and characterized. Under a 980 nm diode laser excitation, the upconversion emission spectra of the material under different temperature were measured in the temperature range of 308 K–573 K. The fluorescence intensity ratios (FIRs) of the Tm3+:3F2 → 3H6 (684 nm) and Tm3+:3F3 → 3H6 (696 nm) emissions to the Tm3+:3H4 → 3H6 (814 nm) emission were respectively calculated. The results show that the natural logarithm of both FIRs change linearly with the reciprocal of temperature. The maximum absolute sensitivities are 0.00544 K−1 and 0.00617 K−1 at 323 K, respectively, which are about one order higher than that of most of the previously reported Tm3+/Yb3+ doped materials with other hosts. The results indicate that SrWO4:Tm3+/Yb3+ is a very promising material for highly sensitive optical thermometry.
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