Center for Chemistry of Novel and High-Performance Materials, and Department of Chemistry, Zhejiang University , Hangzhou, 310027, P. R. China.
J Am Chem Soc. 2014 Jan 8;136(1):179-87. doi: 10.1021/ja4078528. Epub 2013 Dec 27.
Here we report the first series of phase-pure zinc-blende CdSe/CdS core/shell quantum dots (QDs) with reproducibly controlled shell thickness (4-16 monolayers), which are nonblinking (≥95% 'on' time) in single-exciton regime for the entire series. These unique QDs possess well-controlled yet simple excited-state decay dynamics at both single-dot and ensemble levels, extremely small nonblinking volume threshold, if any, and unique 'on' and 'off' probability statistics. The outstanding optical properties of the QDs at the single-dot level were found to be correlated well with their ensemble properties. These small and bright nonblinking QDs offer promising technical application prospect in both single-dot and ensemble levels. The consistent and reproducible experimental results shed new light on the mechanisms of blinking of QDs.
在这里，我们报告了第一组具有可重复控制壳层厚度（4-16 单层）的相纯闪锌矿 CdSe/CdS 核/壳量子点（QD），在整个系列中，它们在单激子态下具有非闪烁（≥95%“开启”时间）。这些独特的 QD 在单分子和集合体水平上具有良好控制但简单的激发态衰减动力学，即使有非闪烁体积阈值也非常小，并且具有独特的“开启”和“关闭”概率统计。在单分子水平上，QD 的出色光学性质与其集合体性质密切相关。这些小而亮的非闪烁 QD 在单分子和集合体水平上都提供了有前途的技术应用前景。一致且可重复的实验结果为 QD 闪烁的机制提供了新的见解。
