Abstract
Variations of fluorescence intensity ratio of green upconversion emissions in Er3+:Y2O3 nanocrystals and their bulk counterpart have been studied as a function of temperature. In the temperature range of 323–773K, the maximum sensitivity of about 0.003K−1 is obtained in the samples synthesized by the conventional sol–gel method at 800°C. It is found that the upconversion emission is enhanced by a factor of about 56 after re-calcining the conventional samples at 1300°C. Besides that, the sensitivity is increased to the value of about 0.004K−1, and the sensing accuracy is also improved. With efficient upconversion luminescence, high degree of sensitivity and accuracy, Er3+ doped Y2O3 bulk counterpart show promising application in nanoscale thermal sensor.
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