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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

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
StatePublished - 25 Oct 2007

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