Synthesis and Crystal Structure of the Short LnSb2O4Br Series (Ln = Eu–Tb) and Luminescence Properties of Eu3+-Doped Samples

Crystals

KatharinaV. Dorn¹  Veronica Paterlini¹  Anja-Verena Mudring¹  FelixC. Goerigk²  Thomas Schleid² 

[1] Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-10691 Stockholm, Sweden;Institute for Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany;

关键词: lanthanoid compounds;    halide oxoantimonates(III);    structure elucidation;    luminescence characterization;    solid-state synthesis;    single-crystal X-ray diffraction;   

DOI  :  10.3390/cryst10121089

来源: DOAJ

【 摘 要 】

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 $\{{[{\mathrm{SbO}}_{2/2}^v{\mathrm{O}}_{1/1}^t]}^{–}\}_{\infty }^1$ (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.

【 授权许可】

Unknown