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Hexagonal phase NaLuF4∶Yb3/+Er3+ microrods were synthesized hydrothermally.An analysis of the intense green upconversion emission at 525 and 550 nm in hexagonal phase NaLuF4∶Yb3/+Er3+ microrods under excitation power density of 4.1 W/cm2 available from a diode laser emitting at 976 nm,has been undertaken.Fluorescence intensity ratio(FIR)variation of temperature-sensitive green upconversion emission at 520 and 550 nm in this material was recorded in the biotemperature range from 293 to 343 K.The maximum sensitivity derived from the FIR technique of the green upconversion emission is approximately 0.0044 K-1.The results imply that hexagonal phase NaLuF4∶Yb3/+Er3+ microrods potential candidate to be the optical temperature sensor.