Irreversibility in Anion Exchange Between Cesium Lead Bromide and Iodide Nanocrystals Imaged by Single-Particle Fluorescence

These results reveal that there are structural differences between CsPbI3 nanocrystals synthesized by the hot-injection method and those produced by anion exchange

Dong Wang; Dongyan Zhang; Bryce Sadtler

2020

Scholarcy highlights

  • Anion exchange is a powerful method to tune the emission wavelength of perovskite CsPbX3 nanocrystals across the visible spectrum
  • CsPbI3 nanocrystals undergo more abrupt shifts in their emission characteristics as they transform to CsPbBr3, while CsPbBr3 nanocrystals exhibit a smoother transition during their transformation to CsPbI3
  • Simulations of anion exchange using Monte Carlo trajectories are consistent with a larger degree of structural reorganization when CsPbI3 nanocrystals undergo anion exchange
  • These results reveal that there are structural differences between CsPbI3 nanocrystals synthesized by the hot-injection method and those produced by anion exchange
  • The narrower distribution of reaction times when CsPbI3 nanocrystals transform to CsPbBr3 may produce better compositional homogeneity when this reaction is scaled-up to incorporate these materials into optoelectronic devices
  • Fluorescence video using the green filter set in which individual nanocrystals become bright as they transform from CsPbI3 to CsPbBr3
  • Most electronic Supporting Information files are available without a subscription to ACS Web Editions

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