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Multiple Dark Excitons in Semiconductor CdSe Nanocrystals C
- Lv, Yan, Huang, Xiangnan, Zhang, Chunfeng, Wang, Xiaoyong, Xiao, Min
- Journal of physical chemistry 2018 v.122 no.41 pp. 23758-23763
- energy, nanocrystals, physical chemistry, semiconductors, temperature
- When excited with a low laser power, the dark excitons in semiconductor CdSe nanocrystals (NCs) are associated with a long radiative lifetime at the cryogenic temperature. With the increasing laser excitation power, there additionally appears a fast lifetime component that signifies the effective generation of multiple dark excitons. Similar to the case of multiple bright excitons, the Auger recombination of multiple dark excitons in large-sized CdSe NCs is greatly suppressed to render them a highly emissive nature. The introduction of multiple dark excitons to the current studies of semiconductor CdSe NCs will surely promote various potential applications such as in high-capacity energy storage and low-threshold optoelectronic lasing.