Abstract
Currently, lanthanide ion doped upconversion (UC) phosphors that usually use Yb3+ and Nd3+ as sensitizers are widely used in optical thermometers. However, under 1532 nm laser excitation with deeper tissue penetration, Er3+ has abundant UC luminescence. In this paper, a novel optical thermometer based on NaLuF4:20 % Er3+ microcrystals is prepared by a simple hydrothermal method. The temperature sensing performance of microcrystals is studied by using the luminescence intensity ratio (LIR) method. The maximum absolute sensitivity and maximum relative sensitivity of LIR (I660/I540) are 0.089 K−1 and 1.87 %K−1, respectively. The NaLuF4:Er microcrystals can be applied in deep tissue temperature measurement.
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