Study of fluorescence enhancement of colloidal CdSe/ZnS quantum dots bound to hexadecylamine by single-molecule measurements

Chi Tsu Yuan, Wu Ching Chou, Yueh Nan Chen, Jui Wen Chou, Der San Chuu, Cheng An J. Lin, Jimmy K. Li, Walter H. Chang, Ji Lin Shen

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Fluorescence enhancement of colloidal CdSe/ZnS quantum dots (QDs) by the binding of hexadecylamine (HDA) ligands was investigated at the single-QD level. The blinking behavior of individual CdSe/ZnS QDs can be dramatically modified by additional HDA ligands. Both the ratio of the mean on/off time lengths and the total number of emitted photons within the on-time duration can be enhanced, by factors of up to 2.8 and 13, respectively. Consequently, the blinking rate can be suppressed down to 18%. The fluorescence decay curve is closer to a single-exponential decay profile and has a longer measured lifetime. These results suggest that HDA ligands can further improve surface passivation.

Original languageEnglish
Pages (from-to)15166-15172
Number of pages7
JournalJournal of Physical Chemistry C
Volume111
Issue number42
DOIs
Publication statusPublished - 2007 Oct 25

All Science Journal Classification (ASJC) codes

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

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