AI Article Synopsis
- Postsynthetic chemical transformations, particularly anion-exchange reactions, allow for fine-tuning of colloidal nanocrystals' composition and morphology.
- This study showcases a new method for fast, low-temperature anion-exchange in highly luminescent cesium lead halide perovskite nanocrystals (CsPbX3), enabling photoluminescence tuning across the visible spectrum.
- By mixing different halide compositions, researchers achieve uniform compositions while maintaining high quantum yields and narrow emission line widths, illustrating the potential for diverse applications.
Article Abstract
Postsynthetic chemical transformations of colloidal nanocrystals, such as ion-exchange reactions, provide an avenue to compositional fine-tuning or to otherwise inaccessible materials and morphologies. While cation-exchange is facile and commonplace, anion-exchange reactions have not received substantial deployment. Here we report fast, low-temperature, deliberately partial, or complete anion-exchange in highly luminescent semiconductor nanocrystals of cesium lead halide perovskites (CsPbX3, X = Cl, Br, I). By adjusting the halide ratios in the colloidal nanocrystal solution, the bright photoluminescence can be tuned over the entire visible spectral region (410-700 nm) while maintaining high quantum yields of 20-80% and narrow emission line widths of 10-40 nm (from blue to red). Furthermore, fast internanocrystal anion-exchange is demonstrated, leading to uniform CsPb(Cl/Br)3 or CsPb(Br/I)3 compositions simply by mixing CsPbCl3, CsPbBr3, and CsPbI3 nanocrystals in appropriate ratios.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4538456 | PMC |
| http://dx.doi.org/10.1021/acs.nanolett.5b02404 | DOI Listing |
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