NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
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.
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.
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, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=930016
(Accessed October 1, 2025)