  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.
