Quinn, S. D. , Rafferty, A., Dick, E., Morten, M. J., Kettles, F. J., Knox, C., Murrie, M. and Magennis, S. W. (2016) Surface charge control of quantum dot blinking. Journal of Physical Chemistry C, 120(34), pp. 19487-19491. (doi: 10.1021/acs.jpcc.6b07779)
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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.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Quinn, Dr Steven and Magennis, Dr Steven and Morten, Dr Michael and Murrie, Professor Mark |
Authors: | Quinn, S. D., Rafferty, A., Dick, E., Morten, M. J., Kettles, F. J., Knox, C., Murrie, M., and Magennis, S. W. |
College/School: | College of Science and Engineering > School of Chemistry |
Journal Name: | Journal of Physical Chemistry C |
Publisher: | American Chemical Society |
ISSN: | 1932-7447 |
ISSN (Online): | 1932-7455 |
Published Online: | 08 August 2016 |
Copyright Holders: | Copyright © 2016 The Authors |
First Published: | First published in Journal of Physical Chemistry C 120(34):19487-19491 |
Publisher Policy: | Reproduced under a Creative Commons License |
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