Abstract A series of LuAG: 5 mol%Yb3+/x mol%Tm3+ (x = 0.1, 0.3, 0.5, 1, 2) poly-crystals have been prepared through floating zone method with CO2 laser. The up-conversion luminescence spectra of the samples were recorded under 980 nm excitation. The results tell us that the optimal concentration of Tm3+ ions is around 0.3 mol%. Moreover, the optical temperature sensing properties of the LuAG: 5 mol%Yb3+/0.3 mol%Tm3+ have been investigated by using fluorescence intensity ratio (FIR) method. The FIR data obtained agree well with the fitting curve from 298 K to 1023 K. The absolute and relative sensitivities reach the highest values of 5.55 × 10−3 K−1 at 1023 K and 7.17 × 10−3 K−1 at 555 K, respectively. The results indicate that the Tm3+/Yb3+:LuAG poly-crystalline phosphor is a promising candidate for wide-range and highly sensitive temperature sensor.

中文翻译：

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基于上转换发光的Tm3+/Yb3+共掺杂LuAG多晶荧光粉的光学温度传感特性

摘要 采用CO2激光浮区法制备了一系列LuAG:5 mol%Yb3+/x mol%Tm3+ (x = 0.1, 0.3, 0.5, 1, 2)多晶。在 980 nm 激发下记录样品的上转换发光光谱。结果告诉我们，Tm3+ 离子的最佳浓度约为 0.3 mol%。此外，还使用荧光强度比 (FIR) 方法研究了 LuAG: 5 mol%Yb3+/0.3 mol%Tm3+ 的光学温度传感特性。获得的FIR数据与298 K到1023 K的拟合曲线吻合良好。绝对和相对灵敏度在1023 K时达到最高值5.55 × 10−3 K−1，在555 K时达到7.17 × 10−3 K−1 ， 分别。结果表明，Tm3+/Yb3+：