U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Brightly Luminescent CsPbBr3 Nanocrystals through Ultracentrifugation

Published

Author(s)

Jeffrey Fagan, Erik K. Hobbie, Aaron Forde, Richard D. Schaller, salim thomas, samuel brown, Matthew B. Kurtti, dmitri kilin

Abstract

Colloidal lead-halide-perovskite nanocrystals (NCs) offer broad color tunability with bright photoluminescence (PL), fast lifetime, and narrow spectral linewidth. Because emission is tuned primarily through chemical composition, quantum confinement and size-dependent optical effects have received relatively little attention. Using a combination of density-gradient and analytical ultracentrifugation, we study the photophysical profile of as-synthesized CsPbBr3 NC suspensions by separating them into size-resolved fractions. Size purification drastically alters the ligand profile of the parent suspensions, which necessitates post-processing through the addition of ligand and insoluble salt to achieve bright stable suspensions. We observe high PL quantum yield, blue-emitting fractions, and a narrowing of PL spectra, as well as a crossover from pure to stretched-exponential PL relaxation dynamics with decreasing NC size. As a function of edge length, L, the peak PL energy scales a L^-2, in agreement with the simple particle-in-a-box picture of quantum confinement.
Citation
Journal of Physical Chemistry Letters
Pub Type
Journals

Download Paper

DOI Link

Keywords

perovskite, nanoparticle, separation, characterization
Nanophysics, Nanometrology and Materials characterization

Citation

Fagan, J. , Hobbie, E. , Forde, A. , Schaller, R. , thomas, S. , brown, S. , Kurtti, M. and kilin, D. (2020), Brightly Luminescent CsPbBr3 Nanocrystals through Ultracentrifugation, Journal of Physical Chemistry Letters, [online], https://doi.org/10.1021/acs.jpclett.0c01936 (Accessed December 11, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created July 30, 2020, Updated March 2, 2023