Continuous distribution of emission states from single CdSe/ZnS quantum dots

Kai Zhang, Hauyee Chang, Aihua Fu, A. Paul Alivisatos, Haw Yang

Research output: Contribution to journalArticlepeer-review

225 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)843-847
Number of pages5
JournalNano Letters
Issue number4
StatePublished - Apr 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • Mechanical Engineering
  • Bioengineering
  • General Materials Science


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