Fast Anion-Exchange in Highly Luminescent Nanocrystals of Cesium Lead Halide Perovskites (CsPbX3, X = Cl, Br, I)

Georgian Nedelcu, Loredana Protesescu, Sergii Yakunin, Maryna I. Bodnarchuk, Matthias J. Grotevent, Maksym V. Kovalenko*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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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 anionexchange 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 nano crystals in appropriate ratios.

Original languageEnglish
Pages (from-to)5635-5640
Number of pages6
JournalNano Letters
Volume15
Issue number8
DOIs
Publication statusPublished - Aug-2015
Externally publishedYes

Keywords

  • Nanocrystals
  • perovskites
  • metal halides
  • cation exchange
  • anion exchange
  • photoluminescence
  • CATION-EXCHANGE
  • GALVANIC REPLACEMENT
  • HOLLOW NANOCRYSTALS
  • QUANTUM DOTS
  • NANOSCALE
  • PHASE
  • LIGHT
  • NANOSTRUCTURES
  • BRIGHT

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