Light-Triggered Switching of Quantum Dot Photoluminescence through Excited-State Electron Transfer to Surface-Bound Photochromic Molecules

Suyog Padgaonkar, Christopher T. Eckdahl, Jakub K. Sowa, Rafael López-Arteaga, Dana E. Westmoreland, Eliot F. Woods, Shawn Irgen-Gioro, Benjamin Nagasing, Tamar Seideman, Mark C. Hersam, Julia A. Kalow, Emily A. Weiss

Research output: Contribution to journalArticlepeer-review

Abstract

This paper describes reversible "on-off"switching of the photoluminescence (PL) intensity of CdSe quantum dots (QDs), mediated by photochromic furylfulgide carboxylate (FFC) molecules chemisorbed to the surfaces of the QDs. Repeated cycles of UV and visible illumination switch the FFC between "closed"and "open"isomers. Reversible switching of the QDs' PL intensity by >80% is enabled by different rates and yields of PL-quenching photoinduced electron transfer (PET) from the QDs to the respective isomers. This difference is consistent with cyclic voltammetry measurements and density functional calculations of the isomers' frontier orbital energies. This work demonstrates fatigue-resistant modulation of the PL of a QD-molecule complex through remote control of PET. Such control potentially enables applications, such as all-optical memory, sensing, and imaging, that benefit from a fast, tunable, and reversible response to light stimuli.

Original languageEnglish
Pages (from-to)854-860
Number of pages7
JournalNano letters
Volume21
Issue number1
DOIs
Publication statusPublished - Jan 13 2021

Keywords

  • Responsive nanomaterials
  • electron transfer
  • photochromic molecules
  • photoswitch
  • quantum dots

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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