Two Mechanisms Determine Quantum Dot Blinking

Yuan, G, Gomez, D, Kirkwood, N, Boldt, K and Mulvaney, P 2018, 'Two Mechanisms Determine Quantum Dot Blinking', ACS Nano, vol. 12, no. 4, pp. 3397-3405.

Document type: Journal Article
Collection: Journal Articles

Title Two Mechanisms Determine Quantum Dot Blinking
Author(s) Yuan, G
Gomez, D
Kirkwood, N
Boldt, K
Mulvaney, P
Year 2018
Journal name ACS Nano
Volume number 12
Issue number 4
Start page 3397
End page 3405
Total pages 9
Publisher American Chemical Society
Abstract 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.
Subject Physical Chemistry of Materials
Nanofabrication, Growth and Self Assembly
Keyword(s) Auger recombination
photoluminescence intermittency
quantum dots
surface states
DOI - identifier 10.1021/acsnano.7b09052
Copyright notice © 2018 American Chemical Society
ISSN 1936-0851
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