Quinn, Steven D. orcid.org/0000-0003-3442-4103, Rafferty, Aidan, Dick, Emma et al. (5 more authors) (2016) Surface Charge Control of Quantum Dot Blinking. Journal of Physical Chemistry C. pp. 19487-19491. ISSN 1932-7455
Abstract
A characteristic property of colloidal semiconductor nanocrystal quantum dots (QDs) is their emission intermittency. Although a unifying theory of QD photoprocesses remains elusive, the importance of charged states is clear. We now report a new approach to directly study the role of surface charge on QD emission by adding metal ions to individual, core-only QDs immobilized in aqueous solution in an agarose gel. The CdTe QDs show very stable emission in the absence of metal ions but a dramatic and reversible increase in blinking due to the presence of trivalent metal ions. Our results support a charge-separation model, in which the major blinking pathway is the surface trapping of electrons; transiently bound metal ions close to the QD surface enhance this process.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 American Chemical Society |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) The University of York > Faculty of Sciences (York) > Biology (York) |
Depositing User: | Pure (York) |
Date Deposited: | 21 Jun 2018 13:10 |
Last Modified: | 24 Oct 2024 00:03 |
Published Version: | https://doi.org/10.1021/acs.jpcc.6b07779 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1021/acs.jpcc.6b07779 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:132432 |