Exploration of up-conversion thermal enhancement mechanism and application on temperature sensing of Sc2W3O12: Yb3+, Er3+ materials

The temperature quenching luminescence effect of optical materials used for fluorescence intensity ratio temperature sensing seriously hinders the realization of temperature sensing in the high temperature region. In recent years, some abnormal thermal enhancement up-conversion materials have attracted extensive attention due to their great potential to sense temperature in high temperature regions. At present, few up-conversion luminescence thermal enhancement materials have reported, and the exploration of thermal enhancement luminescence mechanism is not thorough enough. In this work, new up-conversion luminescence materials Sc 2 W 3 O 12 : Yb 3+ , Er 3+ were prepared, and the thermal enhancement effect was successfully regulated by changing the Yb 3+ concentration. The integral emission intensity and intensity of 521 nm at 753 K of Sc 1.42 W 3 O 12 : 0.54Yb 3+ , 0.04Er 3+ can reach 74.5 and 104.9 times of that at room temperature, respectively. In addition, the thermal enhancement luminescence property of up-conversion materials Sc 2 W 3 O 12 : Yb 3+ , Er 3+ was confirmed to be derived from negative thermal expansion properties based on two reference experiments. Finally, the dual temperature sensing model was established to sense the temperature. The results show that the up-conversion thermal enhancement luminescence material is a potential temperature sensing material with high sensitivity, wide temperature sensing range, high resolution and good thermal fatigue resistance. • The thermal enhancement luminescence effect of up-conversion materials can be successfully regulated by changing the Yb 3+ concentration. • The highest peak emission intensity of up-conversion luminescence materials Sc 1.42 W 3 O 12 : 0.54 Yb 3+ , 0.04Er 3+ at high temperature can exceed 100 times that at room temperature. • The thermal enhancement emission of up-conversion luminescent materials Sc 2 W 3 O 12 : Yb 3+ , Er 3+ caused by negative thermal expansion through two groups of reference experiments. • Temperature sensing materials Sc 1.42 W 3 O 12 : 0.54 Yb 3+ , 0.04Er 3+ show high sensitivity, high precision and good repeatability.