Single quantum dot spectroscopy for exciton dynamics

Colloidal semiconductor quantum dots (QDs) exhibit broadband light absorption, continuously tunable narrowband emission, and high photoluminescence quantum yields. As such, they represent promising materials for use in light-emitting diodes, solar cells, detectors, and lasers. Single-QD spectroscopy can remove the ensemble averaging to reveal the diverse optical properties and exciton dynamics of QD materials at the single-particle level. The results of relevant research can serve as guidelines for materials science community in tailoring the synthesis of QDs to develop novel applications. This paper reviews recent progress in exciton dynamics revealed by single-QD spectroscopy, focusing on the exciton and multi-exciton dynamics of single colloidal CdSe-based QDs and perovskite QDs. Finally, potential future directions for single-QD spectroscopy and exciton dynamics are briefly considered.