Journal
NANO LETTERS
Volume 21, Issue 1, Pages 854-860Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c04611
Keywords
Responsive nanomaterials; photochromic molecules; quantum dots; photoswitch; electron transfer
Categories
Funding
- Northwestern University Materials Research Science and Engineering Center (MRSEC) [NSF DMR-1720139]
- National Science Foundation Graduate Research Fellowship [DGE-1842165]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- State of Illinois
- International Institute for Nanotechnology (IIN)
- Office of the Provost
- Office for Research
- Northwestern University Information Technology
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This paper describes reversible on-off switching of the photoluminescence intensity of CdSe quantum dots mediated by photochromic furylfulgide carboxylate molecules chemisorbed to the QDs' surfaces. The switching is enabled by different rates and yields of PL-quenching photoinduced electron transfer from the QDs to the isomers, consistent with cyclic voltammetry measurements and density functional calculations. This work demonstrates fatigue-resistant modulation of the PL of a QD-molecule complex through remote control of PET, enabling potential applications like all-optical memory, sensing, and imaging with a fast, tunable, and reversible response to light stimuli.
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.
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