Chemical control of the photoluminescence of CdSe quantum dot-organic complexes with a series of para-substituted aniline ligands

Kathryn E. Knowles, Daniel B. Tice, Eric A. McArthur, Gemma C. Solomon, Emily A Weiss

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

Replacement of the native (as-synthesized) ligands of colloidal CdSe QDs with varying concentrations of a series of para-substituted anilines (R-An), where R ranges from strongly electronwithdrawing to strongly electron-donating, decreases the PL of the QDs. The molar ratio of R-An to QD ([R-An]:[QD]) at which the PL decreases by 50% shifts by 4 orders of magnitude over the series R-An. The model employed to describe the data combines a Freundlich binding isotherm (which reflects the dependence of the binding affinity of the amine headgroups of R-An on the substituent R) with a function that describes the response of the PL to R-An ligands once they are bound at their equilibrium surface coverage. The latter function includes as a parameter the rate constant, knr, for nonradiative decay of the exciton at a site to which an R-An ligand is coordinated. The value of this parameter reveals that the predominant mechanism of QD-ligand interaction is passivation of Cd2+ surface sites through σ-donation for R-An ligands with R ) H, Br, OCF3, and reductive quenching through photoinduced hole transfer for R = MeO, (Me)2N.

Original languageEnglish
Pages (from-to)1041-1050
Number of pages10
JournalJournal of the American Chemical Society
Volume132
Issue number3
DOIs
Publication statusPublished - 2010

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Quantum Dots
Aniline
Semiconductor quantum dots
Photoluminescence
Ligands
Aniline Compounds
Passivation
Excitons
Amines
Isotherms
Quenching
Rate constants
aniline
Electrons

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Chemical control of the photoluminescence of CdSe quantum dot-organic complexes with a series of para-substituted aniline ligands. / Knowles, Kathryn E.; Tice, Daniel B.; McArthur, Eric A.; Solomon, Gemma C.; Weiss, Emily A.

In: Journal of the American Chemical Society, Vol. 132, No. 3, 2010, p. 1041-1050.

Research output: Contribution to journalArticle

Knowles, Kathryn E. ; Tice, Daniel B. ; McArthur, Eric A. ; Solomon, Gemma C. ; Weiss, Emily A. / Chemical control of the photoluminescence of CdSe quantum dot-organic complexes with a series of para-substituted aniline ligands. In: Journal of the American Chemical Society. 2010 ; Vol. 132, No. 3. pp. 1041-1050.
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