Brightly Luminescent CsPbBr3 Nanocrystals through Ultracentrifugation

Aaron Forde, Jeffrey A. Fagan, Richard D. Schaller, Salim A. Thomas, Samuel L. Brown, Matthew B. Kurtti, Reed J. Petersen, Dmitri S. Kilin, Erik K. Hobbie

Research output: Contribution to journalArticle

Abstract

Using a combination of density-gradient and analytical ultracentrifugation, we studied the photophysical profile of CsPbBr3 nanocrystal (NC) suspensions by separating them into size-resolved fractions. Ultracentrifugation drastically alters the ligand profile of the NCs, which necessitates postprocessing to restore colloidal stability and enhance quantum yield (QY). Rejuvenated fractions show a 50% increase in QY compared to no treatment and a 30% increase with respect to the parent. Our results demonstrate how the NC environment can be manipulated to improve photophysical performance, even after there has been a measurable decline in the response. Size separation reveals blue-emitting fractions, a narrowing of photoluminescence spectra in comparison to the parent, and a crossover from single- to stretched-exponential relaxation dynamics with decreasing NC size. As a function of edge length, L, our results confirm that the photoluminescence peak energy scales a L-2, in agreement with the simplest picture of quantum confinement.

Original languageEnglish
Pages (from-to)7133-7140
Number of pages8
JournalThe journal of physical chemistry letters
Volume11
Issue number17
DOIs
Publication statusPublished - Sep 3 2020

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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    Forde, A., Fagan, J. A., Schaller, R. D., Thomas, S. A., Brown, S. L., Kurtti, M. B., Petersen, R. J., Kilin, D. S., & Hobbie, E. K. (2020). Brightly Luminescent CsPbBr3 Nanocrystals through Ultracentrifugation. The journal of physical chemistry letters, 11(17), 7133-7140. https://doi.org/10.1021/acs.jpclett.0c01936