ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
Two Mechanisms Determine Quantum Dot Blinking.pdf (9.2 MB)
0/0

Two Mechanisms Determine Quantum Dot Blinking

preprint
submitted on 01.09.2017 and posted on 01.09.2017 by Gangcheng Yuan, Daniel E. Gomez, Nicholas Kirkwood, KLAUS BOLDT, Paul Mulvaney

Many potential applications of quantum dots (QDs) can only be realized once the luminescence from single nanocrystals is understood. These applications include the development of quantum logic devices, single photon sources, long-life LEDs, and single molecule biolabels. At the singlenanocrystal level, random fluctuations in the QD photo-luminescence (PL) 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 NCs with close to unity quantum yield to demonstrate that both types of blinking occur in the same QDs.


We prove that Auger-blinking can yield exponential on/off times in contrast to earlier work. The surface passivation strategy determines which blinking mechanism dominates. This study unifies earlier studies on blinking mechanisms and provides direct evidence that stable single QDs can be engineered for optoelectronic applications.

Funding

DP130102134, CE170100026

History

Email Address of Submitting Author

mulvaney@unimelb.edu.au

Email Address(es) for Other Author(s)

daniel.gomez@rmit.edu.au nicholas.kirkwood@gmail.com gangchengy@student.unimelb.edu.au klaus.boldt@uni-konstanz.de

Institution

University of Melbourne

Country

Australia

ORCID For Submitting Author

0000-0002-8007-3247

Declaration of Conflict of Interest

I have no conflict of interest.

Exports

Read the published paper

in ACS Nano

Logo branding

Exports