On new alkaline‐earth hexafluorogermanates as host structures for UV phosphors

  • Two new hexafluorogermanate dihydrates, viz. SrGeF6 ⋅ 2H2O and CaGeF6 ⋅ 2H2O, were synthesised from aqueous solutions; their crystal structures were refined in space group P21/n (SrGeF6 ⋅ 2H2O: a=5.9605(2) Å, b=9.6428(3) Å, a=10.9866(3) Å and β=99.1590(10), Z=4, 5122 refl., 104 param., R1=0.0195, wR2=0.0470; CaGeF6 ⋅ 2H2O: a=5.8472(5) Å, b=10.5099(9) Å, c=9.6267(9) Å and β=103.521(3), Z=4, 4756 refl., 101 param., R1=0.0224, wR2=0.0616). Upon doping with Eu2+ luminescence in the NUV regime was observed. The crystal structures of CaGeF6 and MgGeF6 could be solved and refined via Rietveld refinement from powder samples gained by thermal decomposition of the respective hydrates; both compounds adopt the LiSbF6 structure type (CaGeF6: a=5.4099(5) Å, c=13.9835(13) Å, Z=3, Rwp=0.0291, RBragg=0.0142; MgGeF6: a=5.1219(2) Å, c=13.0851(7), Z=3, Rwp=0.034, RBragg=0.01). Further, the luminescence of MgGeF6 ⋅ 6H2O:Eu2+, which emits light in the violet to blue regime, is reported.

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Author:Martin J. Schäfer, Florian Fleischmann, Henning A. HöppeORCiDGND
Frontdoor URLhttps://opus.bibliothek.uni-augsburg.de/opus4/99517
Parent Title (German):Zeitschrift für anorganische und allgemeine Chemie
Year of first Publication:2022
Publishing Institution:Universität Augsburg
Release Date:2022/11/22
Tag:Inorganic Chemistry
First Page:e202200309
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Festkörperchemie
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Licence (German):CC-BY-NC 4.0: Creative Commons: Namensnennung - Nicht kommerziell (mit Print on Demand)