Fluorescence quantum yield of CdSe/ZnS nanocrystals investigated by correlated atomic-force and single-particle fluorescence microscopy

Y. Ebenstein, T. Mokari, U. Banin

Research output: Contribution to journalArticlepeer-review

194 Scopus citations

Abstract

Correlated atomic-force and fluorescence microscopy are used to study single-particle versus ensemble fluorescence quantum yields (QY) of semiconductor nanocrystals by measuring a simultaneous map of the topography and the single-particle fluorescence. CdSe/ZnS nanocrystal quantum dots and quantum rods with high QY were investigated. A significant portion of dark particles is detected. Comparison with the ensemble solution QY shows that samples with higher QY have a larger fraction of bright particles accompanied by an increased single-particle QY. Saturated emission from single nanocrystals could not be detected because of particle darkening under high-power excitation.

Original languageEnglish
Pages (from-to)4033-4035
Number of pages3
JournalApplied Physics Letters
Volume80
Issue number21
DOIs
StatePublished - 27 May 2002
Externally publishedYes

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