Single-dot spectroscopy of zinc-blende CdSe/CdS core/shell nanocrystals: nonblinking and correlation with ensemble measurements.
Single-dot spectroscopy of zinc-blende CdSe/CdS core/shell nanocrystals: nonblinking and correlation with ensemble measurements.
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DOI：
10.1021/ja4078528
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发表时间：
2014-01
影响因子：
15
通讯作者：
Haiyan Qin;Y. Niu;Renyang Meng;Xing Lin;Runchen Lai;Wei Fang;Xiaogang Peng
中科院分区：
文献类型：
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作者：
Haiyan Qin;Y. Niu;Renyang Meng;Xing Lin;Runchen Lai;Wei Fang;Xiaogang Peng
本文报道了第一系列具有可重复控制的壳层厚度（4 - 16个单层）的相位纯锌掺杂的CdSe/CdS核/壳量子点（QD），整个系列在单激子区不闪烁（≥ 95%的"开启"时间）。这些独特的量子点具有良好的控制，但简单的激发态衰减动力学在单点和合奏水平，非常小的不闪烁的体积阈值，如果有的话，和独特的“开”和“关”的概率统计。量子点在单点水平的突出的光学性质被发现与它们的系综性质很好地相关。这些小而亮的不闪烁量子点在单点和系综水平上都具有良好的技术应用前景。实验结果的一致性和可重复性为量子点闪烁的机制提供了新的线索。
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.