Two Mechanisms Determine Quantum Dot Blinking

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2018
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Yuan, Gangcheng
Gómez, Daniel E.
Kirkwood, Nicholas
Mulvaney, Paul
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10.1021/acsnano.7b09052
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ACS Nano ; 12 (2018), 4. - pp. 3397-3405. - ISSN 1936-0851. - eISSN 1936-086X
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.
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540 Chemistry
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Auger recombination; photoluminescence intermittency; quantum dots; surface states
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ISO 690YUAN, Gangcheng, Daniel E. GÓMEZ, Nicholas KIRKWOOD, Klaus BOLDT, Paul MULVANEY, 2018. Two Mechanisms Determine Quantum Dot Blinking. In: ACS Nano. 12(4), pp. 3397-3405. ISSN 1936-0851. eISSN 1936-086X. Available under: doi: 10.1021/acsnano.7b09052
BibTex
@article{Yuan2018-04-24Mecha-42431,
  year={2018},
  doi={10.1021/acsnano.7b09052},
  title={Two Mechanisms Determine Quantum Dot Blinking},
  number={4},
  volume={12},
  issn={1936-0851},
  journal={ACS Nano},
  pages={3397--3405},
  author={Yuan, Gangcheng and Gómez, Daniel E. and Kirkwood, Nicholas and Boldt, Klaus and Mulvaney, Paul}
}
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