Enhancing sensing sensitivity in Gd2(MoO4)3: Yb3+/Er3+ upconversion phosphors by optimizing the calcination temperature

The X-ray diffraction result of Gd2(MoO4)3: Yb3+/Er3+ phosphors reveals the phase transition process associated with the calcination temperature. Under the same excitation power, the sample prepared at 700 °C shows maximal emission intensity due to the asymmetric structure of the phosphors. In addition, the optical temperature sensing behavior of the samples calcined at different calcination temperatures is also studied in detail. The maximum of absolute sensitivity is found to be 0.02533 K−1 at 482 K, which is obtained for the sample calcined at 700 °C. The result indicates that the samples have a great potential in optical temperature sensing.

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