Optical temperature sensing through extraordinary enhancement of green up-conversion emissions for Er–Yb–Mo:Al2O3

Abstract The extraordinary enhancement of green up-conversion emissions originated from the 2 H 11/2  →  4 I 15/2 and 4 S 3/2  →  4 I 15/2 transitions is obtained for the Er–Yb–Mo:Al 2 O 3 with a 976 nm laser diode excitation. It indicates that such green enhancement arises from the high excited state energy transfer with | 2 F 7/2 , 3 T 2 > state of the Yb 3+ –MoO 4 2− dimer to the 4 F 7/2 level of Er 3+ . Fluorescence intensity ratio (FIR) technique based on the green up-conversion emissions of the Er–Yb–Mo:Al 2 O 3 has been studied as a function of temperature. With an excitation power of 2 mW, the maximum of sensitivity and temperature revolution is approximately 0.0051 K −1 and 0.3 K in the range of 294–973 K, respectively. The Er–Yb–Mo:Al 2 O 3 with intense green up-conversion emissions, a higher operating temperature and revolution indicates that it is a promising material for application in optical temperature sensing.

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