Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton New York 11973, USA.
Small. 2012 Jan 23;8(2):253-8. doi: 10.1002/smll.201101643. Epub 2011 Nov 7.
The effect of the external charge trap on the photoluminescence blinking dynamics of individual colloidal quantum dots is investigated with a series of colloidal quantum dot-bridge-fullerene dimers with varying bridge lengths, where the fullerene moiety acts as a well-defined, well-positioned external charge trap. It is found that charge transfer followed by charge recombination is an important mechanism in determining the blinking behavior of quantum dots when the external trap is properly coupled with the excited state of the quantum dot, leading to a quasi-continuous distribution of 'on' states and an early fall-off from a power-law distribution for both 'on' and 'off' times associated with quantum dot photoluminescence blinking.
研究了外部电荷陷阱对胶体量子点单颗粒荧光闪烁动力学的影响，使用了一系列具有不同桥长的胶体量子点-桥-富勒烯二聚体，其中富勒烯部分作为明确的、精确定位的外部电荷陷阱。当外部陷阱与量子点的激发态适当耦合时，发现电荷转移随后的电荷复合是决定量子点闪烁行为的重要机制，导致“开”态的准连续分布，并导致与量子点荧光闪烁相关的“开”和“关”时间的幂律分布的早期衰减。
