期刊
ACS NANO
卷 12, 期 4, 页码 3397-3405出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b09052
关键词
quantum dots; photoluminescence intermittency; Auger recombination; surface states
类别
资金
- ARC [DP130102134, CE170100026, FT140100514]
- Humboldt Foundation
- Fonds der Chemischen Industrie (FCI)
- University of Melbourne
Many potential applications of quantum dots (QDs) can only be realized once the luminescence from single nanocrystals (NCs) is understood. These applications include the development of quantum logic devices, single-photon sources, long-life LEDs, and single-molecule biolabels. At the single-nanocrystal level, random fluctuations in the QD photoluminescence occur, a phenomenon termed blinking. There are two competing models to explain this blinking: Auger recombination and surface trap induced recombination. Here we use lifetime scaling on core shell chalcogenide NCs to demonstrate that both types of blinking occur in the same QDs. We prove that Auger blinking can yield single-exponential on/off times in contrast to earlier work. The surface passivation strategy determines which blinking mechanism dominates. This study summarizes earlier studies on blinking mechanisms and provides some clues that stable single QDs can be engineered for optoelectronic applications.
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