Fast Lifetime Blinking in Compact CdSe/CdS Core/Shell Quantum Dots
Fast Lifetime Blinking in Compact CdSe/CdS Core/Shell Quantum Dots
复制标题
紧凑型 CdSe/CdS 核/壳量子点的快速寿命闪烁
DOI:
10.1021/acs.jpcc.1c03949
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Zhao, Jing
中科院分区:
文献类型:
--
作者:
Sun, Yonglei;Zhu, Hua;Jin, Na;Chen, Ou;Zhao, Jing
Lifetime blinking is another type of fluorescence fluctuation in single colloidal quantum dots (QDs) apart from the extensively studied intensity blinking. It is a phenomenon of fluctuations in the fluorescence lifetime of a single QD over time while its fluorescence intensity is relatively unaffected. So far lifetime blinking has only been reported in a few QD systems, such as “giant” (i.e., thick-shell) CdSe/CdS core/shell QDs. It remains unclear whether this phenomenon is universal among QDs. In this work, we use statistical methods to demonstrate that the lifetime blinking state, although short-lived, also exists in compact CdSe/CdS core/shell QDs in which nonradiative processes are efficient and lead to intensity blinking when activated. We propose that lifetime blinking happens when a negative trion forms in the core of a QD after photoexcitation while nonradiative processes are not activated. However, the easy accessibility to efficient nonradiative processes results in the short durations of lifetime blinking events in this type of QDs.
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