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Ultra-narrow room-temperature emission from single CsPbBr3 perovskite quantum dots.


ABSTRACT: 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 CsPbBr3 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.

SUBMITTER: Raino G 

PROVIDER: S-EPMC9095639 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature

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Ultra-narrow room-temperature emission from single CsPbBr<sub>3</sub> perovskite quantum dots.

Rainò Gabriele G   Yazdani Nuri N   Boehme Simon C SC   Kober-Czerny Manuel M   Zhu Chenglian C   Krieg Franziska F   Rossell Marta D MD   Erni Rolf R   Wood Vanessa V   Infante Ivan I   Kovalenko Maksym V MV  

Nature communications 20220511 1


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<sub>3</sub> quantum dots, followed by single quantum dot optical spectroscopy, we demonstrate that emission  ...[more]

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