Origin and control of blinking in quantum dots

被引：0

作者：

Efros A.L. ^{[1
]}

Nesbitt D.J. ^{[2
]}

机构：

[1] Naval Research Laboratory, Center for Computational Material Science, Washington, 20375, DC

[2] JILA, University of Colorado and National Institute of Standards and Technology, Department of Chemistry and Biochemistry, University of Colorado, Boulder, 80309-0440, CO

来源：

Nature Nanotechnology | 2016年 / 11卷 / 8期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1038/nnano.2016.140

中图分类号：

学科分类号：

摘要：

Semiconductor nanocrystals offer an enormous diversity of potential device applications, based on their size-tunable photoluminescence, high optical stability and 'bottom-up' chemical approaches to self-assembly. However, the promise of such applications can be seriously limited by photoluminescence intermittency in nanocrystal emission, that is, 'blinking', arising from the escape of either one or both of the photoexcited carriers to the nanocrystal surface. In the first scenario, the remaining nanocrystal charge quenches photoluminescence via non-radiative Auger recombination, whereas for the other, the exciton is thought to be intercepted before thermalization and does not contribute to the photoluminescence. This Review summarizes the current understanding of the mechanisms responsible for nanocrystal blinking kinetics as well as core-shell engineering efforts to control such phenomena. In particular, 'softening' of the core-shell confinement potential strongly suppresses non-radiative Auger processes in charged nanocrystals, with successful non-blinking implementations demonstrated in CdSe-CdS core-thick-shell nanocrystals and their modifications. © 2016 Macmillan Publishers Limited, All rights reserved.

引用

页码：661 / 671

页数：10

共 64 条

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