Fast Lifetime Blinking in Compact CdSe/CdS Core/Shell Quantum Dots

Fast Lifetime Blinking in Compact CdSe/CdS Core/Shell Quantum Dots
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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:
The Journal of Physical Chemistry C
影响因子:
--
通讯作者:
Zhao, Jing
Zhao, Jing
中科院分区:
--
文献类型:
--
作者:
Sun, Yonglei;Zhu, Hua;Jin, Na;Chen, Ou;Zhao, Jing

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寿命闪烁是除了被广泛研究的强度闪烁之外,单个胶体量子点(QD)中的另一种类型的荧光波动。它是单个量子点的荧光寿命随时间起伏的现象,而其荧光强度相对不受影响。到目前为止,寿命闪烁只在少数几个量子点系统中被报道过,例如“巨型”(即厚壳)CdSe/CDS核/壳量子点。目前尚不清楚这种现象在量子点中是否普遍存在。在这项工作中,我们使用统计方法证明了寿命闪烁状态,虽然寿命很短,但也存在于致密的CdSe/CDS核/壳量子点中,其中的非辐射过程是有效的,并在激活时导致强度闪烁。我们提出,当光激发后在量子点的核心形成负的三子,而非辐射过程没有被激活时,就会发生寿命闪烁。然而,这种类型的量子点容易获得有效的非辐射过程,导致这种类型的量子点的寿命闪烁事件的持续时间很短。
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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