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Different concentrations of Er 3+ doped Y 2 O 3 ceramics are synthesized. Under the 966nm excitation, it is found that the ratios of red to green emissions are obviously enhanced with temperature for high doped sample, which is attributed to the combined temperature-dependent processes. Besides that, variations of fluorescence intensity ratio of green upconversion emissions...
Variations of fluorescence intensity ratio of green upconversion emissions in Er 3+ :Y 2 O 3 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...
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