Model of luminescence and delayed luminescence correlated blinking in single 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 CsPbBr₃ nanocrystals. In order to explain the observed phenomena, we propose a novel model of single CsPbBr₃ nanocrystal luminescence blinking based on the hypothesis of slow variations in the electron–phonon coupling.