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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 >Evolution of Yb3+ environment and luminescence properties under ionizing irradiation in aluminoborosilicate glasses
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Evolution of Yb3+ environment and luminescence properties under ionizing irradiation in aluminoborosilicate glasses

机译：硼硅酸铝玻璃在电离辐射下Yb3 +环境的演化和发光特性

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摘要

Yb-doped aluminoborosilicate glasses were irradiated with 2.3 MeV electron and gamma rays at different doses ranging between 10~4 and 2.6 × 10~9 Gy and the local structure around the Yb~(3+) ions has been studied using a combination of NMR, EPR and photoluminescence spectroscopic techniques. The spectroscopic results indicate the presence of two distinct Yb~(3+) sites in these glasses and their relative fractions depend on both the Yb concentration and the irradiation dose. These two sites can be attributed to Yb~(3+) ions with and without Yb next-nearest neighbors. The evolution of the shape of the ~7F_(5/2) → ~7F_(7/2) infrared emission band under irradiation is explained by a preferential reduction of the Yb~(3+) ions with Yb next-nearest neighbors at high integrated doses (> 10~8 Gy). This interpretation is supported by a strong decrease of the visible cooperative luminescence under irradiation due to the reduction into the Yb pairs. In other terms, it shows an interesting effect of ionizing irradiation on the Yb clusters. A low intensity emission band appears in irradiated samples at 390 nm that can be attributed to Yb~(2+). Finally, the decrease of the Yb ~(3+) fluorescence lifetime observed under irradiation appears to be primarily due to electronic interaction of these ions with Non-Bridging Oxygen Hole Centre defects created by the ionizing radiation.
机译：用2.3 MeV电子和伽马射线辐照掺Yb的铝硼硅酸盐玻璃，剂量范围为10〜4至2.6×10〜9 Gy，并且结合NMR研究了Yb〜（3+）离子周围的局部结构，EPR和光致发光光谱技术。光谱结果表明在这些玻璃中存在两个不同的Yb〜（3+）位点，它们的相对分数取决于Yb浓度和辐照剂量。这两个位点可归因于有和没有近邻Yb的Yb〜（3+）离子。辐照下〜7F_（5/2）→〜7F_（7/2）红外发射带的形状演变是通过在高温下将Yb〜（3+）离子与Yb次近邻优先还原而解释的综合剂量（> 10〜8 Gy）。由于还原成Yb对，可见光下协同发光的强烈降低支持了这种解释。换句话说，它显示出电离辐射对Yb团簇的有趣影响。在390 nm的辐照样品中出现低强度发射带，这可能归因于Yb〜（2+）。最后，在辐射下观察到的Yb〜（3+）荧光寿命的降低似乎主要归因于这些离子与电离辐射产生的非桥接氧孔中心缺陷的电子相互作用。

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