Continuous Distribution of Emission States from Single CdSe/ZnS Quantum Dots

Kai Zhang,† Hauyee Chang,†‡ Aihua Fu,† A. Paul Alivisatos,†§ and Haw Yang*†
Department of Chemistry, University of California at Berkeley, and Materials Sciences Division and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
Nano Lett., 2006, 6 (4), pp 843–847
DOI: 10.1021/nl060483q
Publication Date (Web): March 21, 2006
Copyright © 2006 American Chemical Society
†

 Department of Chemistry, University of California at Berkeley.

,
‡

 Current address:  Xradia Inc., Concord, CA.

,
§

 Materials Sciences Division, Lawrence Berkeley National Laboratory.

,
*

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

,

 Physical Biosciences Division, Lawrence Berkeley National Laboratory.

Abstract

Abstract Image

The photoluminescence dynamics of colloidal CdSe/ZnS/streptavidin quantum dots were studied using time-resolved single-molecule spectroscopy. Statistical tests of the photon-counting data suggested that the simple “on/off” discrete state model is inconsistent with experimental results. Instead, a continuous emission state distribution model was found to be more appropriate. Autocorrelation analysis of lifetime and intensity fluctuations showed a nonlinear correlation between them. These results were consistent with the model that charged quantum dots were also emissive, and that time-dependent charge migration gave rise to the observed photoluminescence dynamics.

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History

  • Published In Issue April 12, 2006
  • Received March 1, 2006

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