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Media type:
E-Article
Title:
Ultra-narrow room-temperature emission from single CsPbBr3 perovskite quantum dots
Contributor:
Rainò, Gabriele;
Yazdani, Nuri;
Boehme, Simon C.;
Kober-Czerny, Manuel;
Zhu, Chenglian;
Krieg, Franziska;
Rossell, Marta D.;
Erni, Rolf;
Wood, Vanessa;
Infante, Ivan;
Kovalenko, Maksym V.
imprint:
Springer Science and Business Media LLC, 2022
Published in:Nature Communications
Language:
English
DOI:
10.1038/s41467-022-30016-0
ISSN:
2041-1723
Origination:
Footnote:
Description:
<jats:title>Abstract</jats:title><jats:p>Semiconductor quantum dots have long been considered artificial atoms, but despite the overarching analogies in the strong energy-level quantization and the single-photon emission capability, their emission spectrum is far broader than typical atomic emission lines. Here, by using ab-initio molecular dynamics for simulating exciton-surface-phonon interactions in structurally dynamic CsPbBr<jats:sub>3</jats:sub> quantum dots, followed by single quantum dot optical spectroscopy, we demonstrate that emission line-broadening in these quantum dots is primarily governed by the coupling of excitons to low-energy surface phonons. Mild adjustments of the surface chemical composition allow for attaining much smaller emission linewidths of 35−65 meV (vs. initial values of 70–120 meV), which are on par with the best values known for structurally rigid, colloidal II-VI quantum dots (20−60 meV). Ultra-narrow emission at room-temperature is desired for conventional light-emitting devices and paramount for emerging quantum light sources.</jats:p>