Photoluminescence of CdSe nanoparticles in the presence of a hole acceptor: N-butylamine

C. Landes, C. Burda, M. Braun, M. A. El-Sayed

Research output: Contribution to journalArticlepeer-review

Abstract

Addition of butylamine to a solution of colloidal CdSe nanoparticles (NPs) caused a decrease in fluorescence intensity, with no effect on the picosecond bleach recovery of the exciton formation or on the luminescence dynamics. The relative fluorescence quantum yield was found to decrease with increasing butylamine concentration and to level off at high concentrations, but the fluorescence lifetimes were not influenced. The nonlinear concentration dependence of the fluorescence quantum yield did not follow the Stem-Volmer equation. This is in agreement with the observation that the CdSe luminescence lifetime was not affected by the addition of butylamine. A mechanism is proposed in which the emission observed in CdSe is assumed to result from the combination of surface-trapped electrons and holes. n-Butylamine occupies hole sites, thus blocking the recombination process, which results in decreasing the density of luminescent centers. These results will be discussed in terms of the nature of the binding sites of the amine on the nanoparticle surface.

Original languageEnglish (US)
Pages (from-to)2981-2986
Number of pages6
JournalJournal of Physical Chemistry B
Volume105
Issue number15
DOIs
StatePublished - Apr 19 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Photoluminescence of CdSe nanoparticles in the presence of a hole acceptor: N-butylamine'. Together they form a unique fingerprint.

Cite this