Crystal structure of bis-[octa-kis-(di-methyl sulfoxide-κ)-ytterbium(III)] penta-bromido-plumbate(II) tribromide di-methyl sulfoxide monosolvate: a ytterbium-doped lead halide perovskite precursor.

A mixture of PbBr and YbBr·HO in a dimethyl sulfoxide (DMSO) solution yielded single crystals of a lead halide perovskite precursor with ytterbium, bis-[octa-kis-(di-methyl sulfoxide)-ytterbium(III)]penta-bromido-plumbate(II) tri-bromide with di-methyl sulfoxide as co-crystallite, [Yb(CHOS)][PbBr]Br·0.5CHOS. The complex ions PbBr and Yb(DMSO) are present in the crystal together with three Br ions and DMSO mol-ecules. X-ray crystallography revealed that the Br ions in YbBr are replaced by the solvent and bound to a Pb atom or remain free. The presence of PbBr units, which are mol-ecular ions with a square-pyramidal structure, is also observed. These single crystals react with a caesium chloride solution, exhibiting near-infrared (NIR) luminescence by visible photoexcitation, suggesting the formation of Yb-doped lead halide perovskites (CsPbBr Cl ·Yb).