Relationship between single quantum-dot intermittency and fluorescence intensity decays from collections of dots
Relationship between single quantum-dot intermittency and fluorescence intensity decays from collections of dots
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DOI：
10.1103/physrevb.70.165304
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发表时间：
2004-10-01
影响因子：
3.7
通讯作者：
Bawendi, MG
中科院分区：
文献类型：
--
作者：
Chung, IH;Bawendi, MG
我们发现，从一个收集的胶体量子点的荧光和在单个量子点中观察到的荧光的缓慢动力学是密切相关的。这个系统说明了在微观水平上揭示动力学行为的重要性，以正确理解系综现象。我们提出了一个模型，介绍了上界和上界的开和关时间的幂律分布在单量子点（QD）荧光闪烁统计。我们使用Monte Carlo模拟和分析形式来定量地将这个单一QD模型与在QD集合中观察到的荧光强度衰减到稳定状态相连接。然而，我们还表明，实验上的QD的集合可以用来直接获得上界的单量子点荧光的幂律统计。
We show that the slow dynamics of the fluorescence from a collection of colloidal quantum dots and the intermittency observed in single quantum dots are intimately related. This system illustrates the importance of uncovering dynamical behavior at the microscopic level for a proper understanding of ensemble phenomenology. We propose a model that introduces lower and upper bounds to the on- and off-time power-law distributions in single-nanocrystal quantum-dot (QD) fluorescence intermittency statistics. We use Monte Carlo simulations and analytical forms to quantitatively connect this single QD model to the fluorescence intensity decay to a steady state that is observed in collections of QD's. Inversely, we also show that experiments on collections of QD's can be used to directly obtain upper bounds to the single-QD fluorescence intermittency power-law statistics.