Abstract
In this paper, a new optical thermometer is reported, based on the upconversion (UC) luminescent NaLuF4:Er3+, Tm3+ microcrystals. Under the excitation of 1532 nm laser, the red UC emission of NaLuF4:Er3+ microcrystals are significantly enhanced by introducing Tm3+ energy-trapping center. The optical temperature dependence of NaLuF4:Er3+, Tm3+ microcrystals are investigated using the fluorescence intensity ratio (FIR) technique. The maximum absolute sensitivity (Sa) is found to reach 3.236 K−1 at 573 K. Using FIRs with different higher relative sensitivities (Sr) in different temperature intervals keeps Sr of the thermometer at a high value (0.626–1.265 %K−1) in the temperature range of 293–573 K. The results show that NaLuF4:Er3+/Tm3+ microcrystals are a potential optical temperature sensing material.
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