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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Effects of postannealing on the photoluminescence properties of coprecipitated nanocrystalline BaFCl:Sm~(3+)
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Effects of postannealing on the photoluminescence properties of coprecipitated nanocrystalline BaFCl:Sm~(3+)

机译：后退火对共沉淀BaFCl：Sm〜（3+）纳米晶光致发光性能的影响

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摘要

Nanocrystalline BaFCl:Sm~(3+), as prepared by coprecipitation from aqueous solutions, is an efficient photoluminescent X-ray storage phosphor. In the present study, we report effects on its photoluminescence properties resulting from postannealing treatment in air in the temperature range between 100 to 900 °C. Interestingly, upon annealing at temperatures from 200 to 600 °C in air, a small fraction of the Sm~(3+) ions in nanocrystalline BaFCl can be reduced to Sm~(2+) ions. In addition to the creation of Sm~(2+) ions, two different sites of Sm~(3+) ions, denoted as sites A and B, are observed when the nanocrystalline BaFCl:Sm~(3+) is annealed between 500 to 900 °C. The temperature dependence of photoluminescence properties of the two different sites in the 500 °C annealed sample reveals that the Sm~(3+) ions at site A are possibly located at or near the crystallite surface, whereas site B is situated in a very ordered environment. To the best of our knowledge, this is the first report on the reduction of Sm~(3+) ions doped in alkaline-earth fluorohalides to Sm~(2+) ions by annealing in air.
机译：由水溶液共沉淀制备的纳米晶BaFCl：Sm〜（3+）是一种有效的光致发光X射线存储荧光粉。在本研究中，我们报告了在100至900°C的温度范围内在空气中进行后退火处理对其光致发光性能的影响。有趣的是，在空气中在200至600°C的温度下退火时，纳米晶BaFCl中的一小部分Sm〜（3+）离子可还原为Sm〜（2+）离子。当纳米晶BaFCl：Sm〜（3+）在500之间退火时，除了产生Sm〜（2+）离子外，还观察到两个不同的Sm〜（3+）离子位置A和B.到900°C。 500°C退火样品中两个不同位置的光致发光特性与温度的关系表明，位置A的Sm〜（3+）离子可能位于微晶表面或附近，而位置B处于非常有序的位置环境。据我们所知，这是第一篇关于通过空气中退火将碱土金属卤化物中的Sm〜（3+）离子还原为Sm〜（2+）离子的报道。

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