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In this paper, Y2O3: Er3+/Gd3+ microcrystal materials have been prepared by sol-gel method. The upconversion(UC) emission spectrum of the sample was measured under the pump excitation of 980 nm. The sensing characteristics were studied as a function of temperature in range of 293–473 K for optical temperature measurement. The maximum sensor sensitivity derived from the ratio of fluorescence intensity of the green UC emissions was approximately 0.0067 K−1. The result demonstrates that Y2O3: Er3+/Gd3+ material can be applied in terms of temperature sensing.

A series of KLa(MoO4)2:Yb3+/Er3+ phosphor was synthesized by a simple hydrothermal method. Under the excitation of 980 nm laser, the phosphor show intense green bands peaked at 525 and 550 nm and a negligible 658 nm red emission (4F9/2→4I15/2), respectively. The optical temperature sensing properties of the phosphor through the fluorescence intensity ratio (FIR) method were discussed by analyzing intensities ratio of 2H11/2 and 4S3/2 emission around the range of 303–423 K. The maximum sensor sensitivity derived from the FIR of the upconversion(UC) green emissions was approximately 0.0105 K−1. This indicates that the phosphor can be used as an excellent material for optical temperature sensing.