Memories in the Photoluminescence Intermittency of Single Cesium Lead Bromide Nanocrystals

TL;DR

This study reveals that single CsPbBr3 nanocrystals exhibit a memory effect in their photoluminescence blinking, driven mainly by intrinsic traps, which is crucial for optimizing perovskite-based light-emitting devices.

Contribution

It demonstrates the presence of a memory effect in the blinking behavior of CsPbBr3 nanocrystals and shows this effect is independent of surface capping or embedding materials.

Findings

Successive on-times are positively correlated.

Successive off-times are positively correlated.

Memory effect is driven by intrinsic traps, not surface chemistry.

Abstract

Single cesium lead bromide (CsPbBr3) nanocrystals show strong photoluminescence blinking, with on- and off- dwelling times following power-law distributions. We investigate the memory effect in the photoluminescence blinking of single CsPbBr3 nanocrystals and find positive correlations for successive on-times and successive off-times. This memory effect is not sensitive to the nature of the surface capping ligand and the embedding polymer. These observations suggest that photoluminescence intermittency and its memory are mainly controlled by intrinsic traps in the nanocrystals. These findings will help optimizing light-emitting devices based on inorganic perovskite nanocrystals.