Excitation wavelength dependence of fluorescence lntermittency in CdSe/ZnS core/shell quantum dots

Kenneth Knappenberger, Daryl B. Wong, Yaroslav E. Romanyuk, Stephen R. Leone

Research output: Contribution to journalArticle

77 Scopus citations

Abstract

Core/shell CdSe/ZnS quantum dot fluorescence-blinking statistics depend strongly on excitation wavelength. Excitation on the band gap (575 nm) results in inverse-power law "on" time distributions. However, distributions resulting from excitation above the band gap (525 nm) require a truncated power law and are 100 times less likely to display 10-s fluorescence. "Off" time statistics are insensitive to the excitation wavelength. The results may be explained by nonemissive trap states accessed with the higher-photon excitation energies.

Original languageEnglish (US)
Pages (from-to)3869-3874
Number of pages6
JournalNano letters
Volume7
Issue number12
DOIs
StatePublished - Dec 1 2007

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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