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- W2970000658 abstract "A detailed investigation into the synthesis of green-emitting powders of Cs4PbBr6 and CsPbBr3 materials by antisolvent precipitation from CsBr–PbBr2 precursor solutions in dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) is reported. Various solvated lead bromide and polybromide species (PbBr2, [PbBr3]−, [PbBr4]2–, and possibly [PbBr5]3– or [PbBr6]4–) are detected in the precursor solutions by optical absorbance and emission spectroscopies. The solvodynamic size of the species in solution is strongly solvent-dependent: ∼1 nm species were detected in DMSO, while significantly larger species were observed in DMF by dynamic light scattering. The solvodynamic size of the lead bromide species plays a critical role in determining the Cs-Pb-Br composition of the precipitated powders: smaller species favor the precipitation of Cs4PbBr6, while larger species template the formation of CsPbBr3 under identical experimental conditions. The powders have been characterized by 133Cs and 207Pb solid-state nuclear magnetic resonance, and 133Cs sensitivity toward the different Cs environments within Cs4PbBr6 is demonstrated. Finally, the possible origins of green emission in Cs4PbBr6 samples are discussed. It is proposed that a two-dimensional Cs2PbBr4 inclusion may be responsible for green emission at ∼520 nm in addition to the widely acknowledged CsPbBr3 impurity, although we found no conclusive experimental evidence supporting such claims." @default.
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- W2970000658 date "2019-08-28" @default.
- W2970000658 modified "2023-09-30" @default.
- W2970000658 title "Green-Emitting Powders of Zero-Dimensional Cs<sub>4</sub>PbBr<sub>6</sub>: Delineating the Intricacies of the Synthesis and the Origin of Photoluminescence" @default.
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- W2970000658 doi "https://doi.org/10.1021/acs.chemmater.9b02944" @default.
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