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Host matrix impact on Er3+ upconversion emission and its temperature dependence

机译:基质对Er3 +上转换发射的影响及其温度依赖性

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By synthesizing Y(1.9-2x)Yb0.1Er2xO3, Y(0.95-x)Yb0.05ErxVO4 and Y(0.95-x)Yb0.05ErxPO4 phosphors, with phonon frequency maxima at 560, 826 and 1050 cm(-1), respectively, we present the impact of phonon energy and crystal structure of the host matrix on upconversion and temperature sensing behavior. The spectral upconversion characteristics of all three phosphors reveal noticeable differences. The temperature sensing studies reveal that the phosphors have maximum sensitivity at similar to 490 K, which is found to be highest (0.0105 K-1) in Y0.947Yb0.05Er0.003VO4 followed by Y1.894Yb0.1Er0.006O3 and Y0.947Yb0.05Er0.003PO4 phosphors. We found that the temperature sensitivity basically depends on the intensity ratio of two thermally coupled emission bands, H-2(11/2) -> I-4(15/2) and S-4(3/2) -> I-4(15/2), of Er3+. Further, the intensity ratio depends on phonon energy of the host lattice, crystal structure, surface quenching centers and the temperature dependence of non- radiative decay rate.
机译:通过合成Y(1.9-2x)Yb0.1Er2xO3,Y(0.95-x)Yb0.05ErxVO4和Y(0.95-x)Yb0.05ErxPO4荧光粉,声子频率最大值分别为560、826和1050 cm(-1)。 ,我们介绍了声子能量和基质的晶体结构对上转换和温度传感行为的影响。所有三种磷光体的光谱上转换特性都显示出明显的差异。温度感测研究表明,磷光体的最大灵敏度接近490 K,在Y0.947Yb0.05Er0.003VO4中最高(0.0105 K-1),其次是Y1.894Yb0.1Er0.006O3和Y0.947Yb0 .05Er0.003PO4荧光粉。我们发现温度灵敏度基本上取决于两个热耦合发射带的强度比,即H-2(11/2)-> I-4(15/2)和S-4(3/2)-> I- Er3 +的4(15/2)。此外,强度比取决于主体晶格的声子能量,晶体结构,表面淬灭中心以及非辐射衰减率的温度依赖性。

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