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Photophysical behavior of ensembles of single semiconductor quantum dots

Published online by Cambridge University Press:  22 March 2013

Kira D. Patty  and
S. M. Sadeghi
Kira D. Patty
Affiliation:
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, U.S.A.
S. M. Sadeghi
Affiliation:
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, U.S.A. Nano and Micro Device Center, university of Alabama in Huntsville, AL35899, U.S.A.
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Abstract

In this contribution we explored the impact of irradiation intensity on the fluorescence of single quantum dots and ensembles of single quantum dots over time scales much greater than the blinking of the individual quantum dots. We also investigated how blinking and photo enhancement are influenced by photo-oxidation when the intensity of the irradiating laser was increased. Analysis of the emission photographs shows the presence of large time scale individual and ensemble blinking behavior. Analysis of the data indicates that photoinduced fluorescence enhancement occurs even when the inter-dot spacing of the quantum dots precludes the formation of a Coulomb blockade. Additionally, irradiation of ensembles of CdSe/ZnS SQDs at higher source intensities lead to a more accelerated suppression of quantum dots emission via photo-oxidation than for ensembles of closely packed quantum dots.

Keywords

nanoscalephotoemissionoptical properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1509: Symposium CC – Optically Active Nanostructures , 2013 , mrsf12-1509-cc03-25
Copyright
Copyright © Materials Research Society 2013

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References

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