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Effect of TiO 2 and Al 2 O 3 on energy transfer and upconversion in Ho–Yb co-doped sol–gel silica glass
Journal of Sol-Gel Science and Technology ( IF 2.5 ) Pub Date : 2020-10-31 , DOI: 10.1007/s10971-020-05424-7
A. L. Fanai , S. Rai

Holmium (Ho3+) and Ytterbium (Yb3+) co-doped in sol–gel silica glasses are prepared and the effect of incorporating TiO2 and Al2O3 are also studied. Photoluminescence studies using 450 nm excitation show that both TiO2 and Al2O3 improves luminescence but through different mechanisms. The observations are in support of the increased energy transfer between Ho3+ and Yb3+ in the presence of TiO2. Upconversion is also observed with 980 nm excitation showing emission in the green and red regions. Upconversion intensity is also enhanced by TiO2 and Al2O3 but comparison of the intensity ratio of the green and red emissions shows significant back transfer in presence of TiO2.The power dependence study reveals the 5F5 → 5I8 transition of Ho3+ involves a two-step process.



中文翻译:

TiO 2和Al 2 O 3对Ho-Yb共掺杂溶胶-凝胶石英玻璃能量转移和上转换的影响

制备了溶胶-凝胶石英玻璃共掺的(Ho 3+)和Y(Yb 3+),并研究了掺入TiO 2和Al 2 O 3的效果。使用450 nm激发的光致发光研究表明TiO 2和Al 2 O 3均改善了发光,但机理不同。这些观察结果支持在TiO 2存在下Ho 3+和Yb 3+之间的能量转移增加。还在980 nm激发下观察到上转换,显示在绿色和红色区域发射。TiO 2也提高了上转换强度与Al 2 O 3相比,绿色和红色发射强度比值的比较显示了在TiO 2存在下的显着反向转移。功率依赖性研究表明,Ho 3+5 F 5  →  5 I 8跃迁涉及两个步骤处理。

更新日期:2020-10-31
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