High thermal sensitivity of Er3+ and Li+ codoped Y2O3 nanocrystals under 976 nm excitation

Er3+ and Li+ codoped Y2O3 nanocrystals has been prepared by sol-gel method. Upconversion spectrum and properties of Er3+ has been studied under excitation at 976 nm. Fluorescence intensity ratio of 2H11/2 and 4S3/2 subband levels in the Er3+ and Li+ codoped Y2O 3 nanocrystals have been studied as a function of temperature. In the temperature range of 295-723 K, the I525nm/I561nm has the highest thermal sensitivity the maximum sensitivity is approximately 0.016 K-1. The Y2O3: Er3+/Li+nanocrystals with high fluorescence efficiency and the higher temperature revolution, indicated that it is promising for applications in optical high temperature sensor.

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