A BaY2F8:Yb3+,Ho3+ phosphor was synthesized using a simple precipitation method. The temperature‐sensing properties of BaY2F8:Yb3+,Ho3+ phosphor were investigated using the fluorescence intensity ratio (FIR) of the thermally coupled energy levels (5F4 and 5S2) of Ho3+. Energy transitions 5F4→5I8 and 5S2→5I8 gave rise to emission peaks at 538 nm and 549 nm, respectively. The areas under these two emission peaks were used to calculate the FIR. Temperature‐dependent upconversion luminescence was recorded in the temperature range 303–623 K using a 980 nm laser excitation source. The results suggested that the BaY2F8:Yb3+, Ho3+ phosphor has the potential to be used as a non‐contact optical temperature sensor.
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