Two Mechanisms Determine Quantum Dot Blinking
Gangcheng Yuan, Daniel E Gomez, Nicholas Kirkwood, Klaus Boldt, Paul Mulvaney
ACS NANO | AMER CHEMICAL SOC | Published : 2018
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/..View full abstract
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Awarded by ARC
P.M. thanks the ARC for support through DP130102134 and CE170100026. K.B. acknowledges support from the Humboldt Foundation through a Feodor Lynen-Fellowship (2012-2015) and from the Fonds der Chemischen Industrie (FCI) through a Liebig Fellowship (since 2015). G.Y. thanks the University of Melbourne for MIFR and MIEA scholarships. D.E.G. thanks the ARC for funding through a Future Fellowship (FT140100514).