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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >UV absorption bands and its relevance to local structures of ytterbium ions in Yb3+/Al3+/P5+-doped silica glasses
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UV absorption bands and its relevance to local structures of ytterbium ions in Yb3+/Al3+/P5+-doped silica glasses

机译：紫外线吸收带及其与YB3 + / Al3 + / p5 +掺杂二氧化硅玻璃中镱离子的局部结构的相关性

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摘要

Yb3+, Yb3+/Al3+, Yb3+/P5+, and Yb3+/Al3+/P5+ doped silica glasses were prepared via the sol-gel method combined with high-temperature sintering. The amorphous nature of as-prepared glasses was confirmed by the X-ray diffraction analysis. The composition dependent ultraviolet (UV) absorption changes in the glasses were correlated with the local structure of Yb3+ ions that was obtained by pulsed electron paramagnetic resonance (EPR). In situ photoluminescence evolution and continuous wave EPR spectrum of color centers induced by a 193-nm UV laser were recorded, and the role of UV absorption bands in the photodarkening process was discussed. The results indicated that the strong UV absorption bands in the range of 190-290 nm were primarily attributed to the charge-transfer (CT) transition from O2- to Yb3+ and the position of CT bands shifted to a higher energy level with increases in the electronegativity of next nearest neighbor atoms (Al/Si/P) of Yb3+ ions. Furthermore, the results revealed that excitation into the CT bands leads to the generation of oxygen hole centers and Yb2+ ions. The study is useful for understanding the underlying mechanism of photodarkening in Yb3+-doped high-power laser fibers.
机译：通过溶胶 - 凝胶法与高温烧结合并制备YB3 +，YB3 + / Al3 +，YB3 + / P5 +和YB3 + / Al3 + / P5 +掺杂二氧化硅玻璃。通过X射线衍射分析确认了制备的玻璃的无定形性质。玻璃中的组成依赖性紫外（UV）吸收变化与通过脉冲电子顺磁共振（EPR）获得的YB3 +离子的局部结构相关。在记录了由193-NM UV激光激光诱导的致颜色中心的原位光致发光和连续波EPR谱探讨，并讨论了紫外吸收带在光二极管过程中的作用。结果表明，190-290nm范围内的强UV吸收带主要归因于从O2-至Yb3 +的电荷转移（CT）转变，CT带的位置随着较高的能量水平而转移到更高的能量水平YB3 +离子的下一个最近邻原子（Al / Si / P）的电负性。此外，结果表明，进入CT带的激发导致氧孔中心和YB2 +离子的产生。该研究对于了解YB3 +掺杂的大功率激光纤维中的光映射的潜在机制是有用的。

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