Lanthanide luminescence as a local probe in mixed anionic hydrides – a case study on Eu2+-doped RbMgHxF3−x and KMgHxF3−x
Lanthanide luminescence as a local probe in mixed anionic hydrides – a case study on Eu2+-doped RbMgHxF3−x and KMgHxF3−x
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DOI：
10.1039/c8tc03881c
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发表时间：
2018-12
影响因子：
6.4
通讯作者：
Thomas Wylezich;S. Welinski;M. Hoelzel;P. Goldner;N. Kunkel
中科院分区：
文献类型：
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作者：
Thomas Wylezich;S. Welinski;M. Hoelzel;P. Goldner;N. Kunkel
在寻找新的混合阴离子染料时，简单而灵敏的检测方法可能是有用的，局部探针可以更好地了解材料。在我们目前的研究中，我们表明，5d-4f镧系发光可以作为一个本地传感器，以验证氢化物的存在，并可能估计氢化物的含量。作为一个模型系统，使用的是Eu 2+掺杂的MMgDxF 3 −x（MMgHxF 3 −x）（M = K，Rb）的氢化物氟化物固溶体系列，它们是通过X射线和中子衍射相结合的方法制备和表征的。在室温下，具有M = Rb的化合物以六方钙钛矿型结构结晶，而具有M = K的化合物以正常立方钙钛矿结构结晶。它们的晶格参数遵循Vegard定律。我们还重新研究了KMgD_2F的结构和阴离子分布。首次在RbMgH_3：Eu ~（2+）中观察到明亮的黄色发光，并且对于两种M，氢化物氟化物化合物，Eu ~（2+）的发光能量介于纯的Eu和氟化物之间，这可用于氢化物含量的校准和快速标定，特别是在低氢化物含量的区域。
In the search for novel mixed anionic hydrides, simple and sensitive detection methods can be useful and local probes lead to a better understanding of the materials. In our present study, we show that 5d–4f lanthanide luminescence can serve as a local sensor to verify the presence of hydride and potentially estimate the hydride content. As a model system, the Eu2+-doped hydride fluoride solid solution series of MMgDxF3−x (MMgHxF3−x) with M = K, Rb is used, which were prepared and characterized by a combined X-ray and neutron diffraction approach. At room temperature, the compounds with M = Rb crystallize in a hexagonal perovskite-type structure and those with M = K crystallize in a normal cubic perovskite structure. Their lattice parameters follow Vegard's law. We also reinvestigated the structure and anion distribution in KMgD2F. Bright yellow emission in RbMgH3:Eu2+ is observed for the first time and for both M, the hydride fluoride compounds show Eu2+ emission energies between those of the pure hydrides and fluorides, which can be used for calibration and fast idendification of the hydride content, especially in the region of low hydride content.