[en] High luminescence intensity is crucial for realizing luminescent temperature sensing with a large signal-to-noise ratio. In this work, the temperature sensing behavior of Ca_1-xNa_xMoO₄:Yb³⁺,Er³⁺ with intense green up-conversion luminescence was studied. It has been demonstrated that the single-band green emission was dependent on the Yb³⁺-MoO₄^2- dimer sensitization as well as the low multi-phonon relaxation rate of ⁴S_3/2 → ⁴F_9/2. In addition, it was found that the uncorrected thermometer could not accurately measure temperature due to thermal effects. A simple method for calibration of up-conversion temperature sensing was reported. Due to high luminescence intensity and temperature sensitivity, Ca_1-xNa_xMoO₄:Yb³⁺,Er³⁺ is a promising candidate for up-conversion temperature sensing.