Model of luminescence and delayed luminescence correlated blinking in single CsPbBr$_3$ nanocrystals

TL;DR

This paper presents a new model explaining luminescence blinking in single CsPbBr3 nanocrystals by linking fast and delayed emission components through slow electron-phonon coupling variations.

Contribution

It introduces a novel theoretical model connecting blinking behavior with electron-phonon interactions in perovskite nanocrystals.

Findings

Correlations found between fast and delayed emission components.

Proposed model explains blinking via slow electron-phonon coupling variations.

Insights into photophysical behavior of CsPbBr3 nanocrystals.

Abstract

Cesium lead halide nanocrystals and quantum dots are prominent materials for different types of applications because of their remarkable photophysical properties. However, they are also known to exhibit the same effects observed for non-perovskite colloidal semiconductor quantum dots such as blinking, photobleaching, delayed luminescence, etc. In this study we reveal the correlations between fast and delayed emission components for both the intensity and characteristic decay time for single CsPbBr$_3$ nanocrystals. In order to explain the phenomena observed, we propose a novel model of single CsPbBr$_3$ nanocrystals luminescence blinking based on the hypothesis of slow variations in the electron-phonon coupling.