In the present paper, we first demonstrate NaLuF_4: Yb~(3+):Tm~(3+)/Ho~(3+) rare earth nanocrystals in microstructure hollow fiber. An analysis of the intense blue upconversion emission at 450 and 475 nm in Tm~(3+)/Yb~(3+) codoped NaLuF_4 under excitation power 0.65W available from solid laser emitting at 980nm, has been undertaken. Fluorescence intensity ratio (FIR) variation of temperature-sensitive blue upconversion emission at 450 and 475 nm in this material was recorded in the temperature range from 300 to 345 K. The maximum sensitivity derived from the FIR technique of the blue upconversion emission is approximately 0.005 K~(-1). The results imply that Tm~(3+)/Yb~(3+) codoped NaLuF_4 is a potential candidate for the optical temperature sensor.
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