Fluorescence intermittency and energy transfer in small clusters of semiconductor quantum dots

Douglas P. Shepherd, Kevin J. Whitcomb, Kenneth K. Milligan, Peter M. Goodwin, Martin P. Gelfand, Alan Van Orden

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

We have studied isolated semiconductor nanocrystal quantum dots (QDs) and small clusters of QDs by singlemolecule time-correlated single-photon counting, from which fluorescence intensity trajectories, autocorrelation functions, decay histograms, and lifetime-intensity distributions have been constructed. These measurements confirm that QD clusters exhibit unique fluorescence behavior not observed in isolated QDs. In particular, the QD clusters exhibit a short-lifetime component in their fluorescence decay that is correlated with low fluorescence intensity of the cluster. A model based on nonradiative energy transfer to QDs within a cluster that have smaller energy gaps, combined with independent blinking for the QDs in a cluster, accounts for the main experimental features.

Original languageEnglish (US)
Pages (from-to)14831-14837
Number of pages7
JournalJournal of Physical Chemistry C
Volume114
Issue number35
DOIs
StatePublished - Sep 9 2010
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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