Crystal structure and luminescence of Cs-Pb-Sn-Br nanocrystals
Source abstract
Abstract
Sn2+ ions were introduced in Cs-Pb-Br nanocrystals (NCs) to test the change of crystal structure and photoluminescence (PL) property. In the cases of Sn/Pb ratios less than 20%, the CsPb1-xSnxBr3 NCs revealed CsPbBr3 crystal structure. With increasing the Sn/Pb ratio, Cs-Pb-Sn-Br NCs exhibited a mixture phase of CsPbBr3 and Cs4PbBr6. The NCs show bright PLQYs (87%) for Sn/Pb molar ratio of 30%. This is ascribed to little amount Cs4PbBr6 decreased the electrons and holes non-radiation recombination of CsPbBr3. With increasing the Sn/Pb ratio to 80%, the Cs4Pb1-xSnxBr6 NCs exhibited pure Cs4PbBr6 phase structure. Furthermore, a weak blue-emitting peak around 450 nm was observed for the Cs4Pb1-xSnxBr6 NCs. This confirms that Sn2+ ions were successfully introduced into Cs4PbBr6 structure. The morphologies of samples changed from initial cubic to hexagonal with increasing Sn/Pb ratios from 20 to 80%. The excitons and free carrier dynamics of the NCs were discussed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Perovskite Materials and Applications · Optical properties and cooling technologies in crystalline materials · Quantum Dots Synthesis And Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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