Abstract
Different concentrations of Er3+ doped Y2O3 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 in Er3+:Y2O3 ceramics have been studied as a function of temperature. A maximum sensitivity of less than 0.003K−1 is obtained in the high doped sample, whereas it is above 0.005K−1 in the low doped sample. Concentration effects on the temperature sensing behaviors are discussed. In addition, similar phenomenon is found in Er3+/Yb3+ codoped NaYF4 nanocrystals.
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