Dynamic Tuning of the Bandgap of CdSe Quantum Dots through Redox-Active Exciton-Delocalizing N-Heterocyclic Carbene Ligands

Dana E. Westmoreland, Rafael López-Arteaga, Leanna Page Kantt, Michael R. Wasielewski, Emily A. Weiss*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Ligands that enable the delocalization of excitons beyond the physical boundary of the inorganic core of semiconductor quantum dots (QDs), called "exciton-delocalizing ligands (EDLs)", offer the opportunity to design QD-based environmental sensors with dynamically responsive optical spectra, because the degree of exciton delocalization depends on the electronic structure of the EDL. This paper demonstrates dynamic, reversible tuning of the optical bandgap of a dispersion of CdSe QDs through the redox states of their 1,3-dimesitylnaphthoquinimidazolylidene N-heterocyclic carbene (nqNHC) ligands. Upon binding of the nqNHC ligands to the QD, the optical bandgap bathochromically shifts by up to 102 meV. Electrochemical reduction of the QD-bound nqNHC ligands shifts the bandgap further by up to 25 meV, a shift that is reversible upon reoxidation.

Original languageEnglish (US)
Pages (from-to)4300-4304
Number of pages5
JournalJournal of the American Chemical Society
Volume144
Issue number10
DOIs
StatePublished - Mar 16 2022

ASJC Scopus subject areas

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

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