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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

Keywords

perovskite, nanoparticle, separation, 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 April 14, 2024)
Created July 30, 2020, Updated March 2, 2023