Physics

Quantum dot

Quantization (signal processing)

Crystallography

Semiconductor

Perovskite (structure)

Biexciton

Atomic physics

Photon

Exciton

Chemistry

Materials science

Phonon

Condensed matter physics

Spectroscopy

Computer science

Molecular physics

Spectral line

Quantum mechanics

Photoluminescence

Light emission

Computer vision

Optoelectronics

Emission spectrum

Nature Communications

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.

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