Exciton-trion transitions in single CdSe-CdS core-shell nanocrystals

Gómez, Daniel E., van Embden, Joel, Mulvaney, Paul, Fernée, Mark J. and Rubinsztein-Dunlop, Halina (2009) Exciton-trion transitions in single CdSe-CdS core-shell nanocrystals. ACS Nano, 3 8: 2281-2287. doi:10.1021/nn900296q


Author Gómez, Daniel E.
van Embden, Joel
Mulvaney, Paul
Fernée, Mark J.
Rubinsztein-Dunlop, Halina
Title Exciton-trion transitions in single CdSe-CdS core-shell nanocrystals
Formatted title
Exciton—trion transitions in single CdSe–CdS core–shell Nanocrystals
Journal name ACS Nano   Check publisher's open access policy
ISSN 1936-0851
1936-086X
Publication date 2009-08-05
Year available 2009
Sub-type Article (original research)
DOI 10.1021/nn900296q
Volume 3
Issue 8
Start page 2281
End page 2287
Total pages 7
Editor Paul S. Weiss
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society (ACS)
Collection year 2010
Language eng
Subject C1
0206 Quantum Physics
970102 Expanding Knowledge in the Physical Sciences
0912 Materials Engineering
Formatted abstract
We report on the observation of an intermediate state in the blinking of single CdSe/CdS core-shell nanocrystals. This state has a low quantum yield and connects the "on" and "off" states commonly observed in the photoluminescence blinking of individual nanocrystals. We find that the transitions between these two emitting states follow nearly single-exponential statistics. The transitions from the "on" state to this intermediate state result from changes in the surface passivation of the nanocrystal. The data are consistent with photoinduced, adsorption/desorption events that take place at the surface of the nanocrystals. The trion state leads to a reduction in photoluminescence in nanocrystals.
© 2009 American Chemical Society.
Keyword Semiconductor nanocrystals
Quantum dots
Excitons
CdSe/CdS
Photoluminescence
Blinking
Spectral diffusion
Single molecule spectroscopy
Trions
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
2010 Higher Education Research Data Collection
School of Physical Sciences Publications
 
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Created: Fri, 04 Sep 2009, 10:22:03 EST