NDLI: Synthesis and Crystal Structure of the Short $LnSb_{2}O_{4}$Br Series (Ln = Eu–Tb) and Luminescence Properties of $Eu^{3+}$-Doped Samples

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Synthesis and Crystal Structure of the Short $LnSb_{2}O_{4}$Br Series (Ln = Eu–Tb) and Luminescence Properties of $Eu^{3+}$-Doped Samples

Content Provider	MDPI
Author	Goerigk, Felix C. Paterlini, Veronica Dorn, Katharina V. Mudring, Anja-Verena Schleid, Thomas
Copyright Year	2020
Abstract	Pale yellow crystals of LnSb₂O₄Br (Ln = Eu–Tb) were synthesized via high temperature solid-state reactions from antimony sesquioxide, the respective lanthanoid sesquioxides and tribromides. Single-crystal X-ray diffraction studies revealed a layered structure in the monoclinic space group P2₁/c. In contrast to hitherto reported quaternary lanthanoid(III) halide oxoantimonates(III), in LnSb₂O₄Br the lanthanoid(III) cations are exclusively coordinated by oxygen atoms in the form of square hemiprisms. These [LnO₈]¹³⁻ polyhedra form layers parallel to (100) by sharing common edges. All antimony(III) cations are coordinated by three oxygen atoms forming ψ¹-tetrahedral [SbO₃]³⁻ units, which have oxygen atoms in common building up meandering strands along [001] according to ${{[{SbO}_{2 / 2}^{v} O_{1 / 1}^{t}]}^{-}}_{\infty}^{1}$ (v = vertex-sharing, t = terminal). The bromide anions are located between two layers of these parallel running oxoantimonate(III) strands and have no bonding contacts with the Ln³⁺ cations. Since Sb³⁺ is known to be an efficient sensitizer for Ln³⁺ emission, photoluminescence studies were carried out to characterize the optical properties and assess their suitability as light phosphors. Indeed, for both, GdSb₂O₄Br and TbSb₂O₄Br doped with about 1.0–1.5 at-% Eu³⁺ efficient sensitization of the Eu³⁺ emission could be detected. For TbSb₂O₄Br, in addition, a remarkably high energy transfer from Tb³⁺ to Eu³⁺ could be detected that leads to a substantially increased Eu³⁺ emission intensity, rendering it an efficient red light emitting material.
Starting Page	1089
e-ISSN	20734352
DOI	10.3390/cryst10121089
Journal	Crystals
Issue Number	12
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2020-11-27
Access Restriction	Open
Subject Keyword	Crystals Inorganic Chemistry Lanthanoid Compounds Halide Oxoantimonates(iii) Structure Elucidation Luminescence Characterization Solid-state Synthesis Single-crystal X-ray Diffraction
Content Type	Text
Resource Type	Article

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