Eu2+掺杂碱土金属氢化物氯化物AE7H12Cl2（Ae=Ca和Sr）的合成与光学性质

2019/03/12   下载量： 2 次

方案摘要

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应用领域 石油/化工
检测样本 无机盐
检测项目 可靠性能
参考标准 暂无

采用立陶宛Ekspla研制的NT342B-SH型纳秒可调谐光学参量发生器输出的6 ns脉宽365nm波长的激光，激发Eu2+掺杂碱土金属氢化物氯化物AE7H12Cl2（Ae=Ca和Sr）样品，观察记录了其光致发光光谱。

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In our study of the optical properties of Eu2+-doped alkaline-earth metal hydride chlorides AE7H12Cl2 (AE = Ca and Sr) we observe yellow (AE = Sr) and orange-red (AE = Ca) emission. Compared to the emission energies of Eu2+ - doped fluorides, chlorides and mixed fluoride chlorides, this corresponds to a wide redshift of the Eu2+ 4f65d1–4f7 emission. We explain this observation with the strong polarizability of the hydride anion and therefore
its strong nephelauxetic effect, which shifts the 5d barycenter to lower energy. Furthermore, the redshift is even significant compared to other known hydride chlorides and hydride oxide chlorides, which is probably caused by the relatively short AE2+/Eu2+−H− distances, or it might also be caused by impurity-trapped exciton states. We have also investigated the temperature dependence of the photoluminescence lifetimes and the thermal stability.
Even though the compounds are probably not ideal for phosphor application due to their low stability against air and moisture, our study underlines the large influence of the highly polarizable hydride anion on the optical properties of divalent europium and shows that Eu2+ could be used as a probe in mixed anionic system to determine the hydride content.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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