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Lanthanide luminescence as a local probe in mixed anionic hydrides – A case study on Eu2+-doped RbMgHxF3-x and KMgHxF3-x

Abstract

In search of 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 MMgDxF3-x (MMgHxF3-x) with M = K, Rb are 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 with M = K 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.

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Publication details

The article was received on 03 Aug 2018, accepted on 08 Nov 2018 and first published on 09 Nov 2018


Article type: Paper
DOI: 10.1039/C8TC03881C
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Lanthanide luminescence as a local probe in mixed anionic hydrides – A case study on Eu2+-doped RbMgHxF3-x and KMgHxF3-x

    T. Wylezich, S. Welinski, M. Hoelzel, P. Goldner and N. Kunkel, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC03881C

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