Research progress of single quantum-dot spectroscopy and exciton dynamics

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Abstract

Colloidal semiconductor quantum dots (QDs) have strong light absorption, continuously adjustable narrowband emission, and high photoluminescence quantum yields, thereby making them promising materials for light-emitting diodes, solar cells, detectors, and lasers. Single-QD photoluminescence spectroscopy can remove the ensemble average to reveal the structure information and exciton dynamics of QD materials at a single-particle level. The study of single-QD spectroscopy can provide guidelines for rationally designing the QDs and giving the mechanism basis for QD-based applications. We can also carry out the research of the interaction between light and single QDs on a nanoscale, and prepare QD-based single-photon sources and entangled photon sources. Here, we review the recent research progress of single-QD photoluminescence spectroscopy and exciton dynamics, mainly including photoluminescence blinking dynamics, and exciton and multi-exciton dynamics of single colloidal CdSe-based QDs and perovskite QDs. Finally, we briefly discuss the possible future development trends of single-QD spectroscopy and exciton dynamics.

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Authors and contacts

Corresponding author:Zhang Guo-Feng,guofeng.zhang@sxu.edu.cn; Xiao Lian-Tuan,xlt@sxu.edu.cn;

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 62127817, 62075120, 62075122, 61875109, 91950109, 62105193), the Joint Research Fund of the NSFC and STINT (Grant No. 62011530133), the Applied Basic Research Program in Shanxi Province (Grant No. 202103021223254), the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province, China (Grant No. 2021L257), the Scientific Research Project for Returned Chinese Scholars of Shanxi Province, China (Grant No. HGKY2019002), and the Program for Middle-aged and Young Innovative Talents of Higher Education Institutions of Shanxi Province, China.

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Vol. 71, Issue 6 - 2022-03-20

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