DNA-mediated excitonic upconversion FRET switching. (17th November 2015)

• Record Type: Journal Article
• Authors: Kellis, Donald L; Rehn, Sarah M; Cannon, Brittany L; Davis, Paul H; Graugnard, Elton; Lee, Jeunghoon; Yurke, Bernard; Knowlton, William B
• Is Part Of: New journal of physics. Volume 17:Number 11(2015:Nov.)
• Publication Date: 2015-11-17
• Subjects: upconverting nanoparticles -- FRET -- DNA nanotechnology -- excitonics -- strand displacement -- excitonic switch; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/17/11/115007
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: Excitonics is a rapidly expanding field of nanophotonics in which the harvesting of photons, ensuing creation and transport of excitons via Förster resonant energy transfer (FRET), and subsequent charge separation or photon emission has led to the demonstration of excitonic wires, switches, Boolean logic and light harvesting antennas for many applications. FRET funnels excitons down an energy gradient resulting in energy loss with each step along the pathway. Conversely, excitonic energy upconversion via upconversion nanoparticles (UCNPs), although currently inefficient, serves as an energy ratchet to boost the exciton energy. Although FRET-based upconversion has been demonstrated, it suffers from low FRET efficiency and lacks the ability to modulate the FRET. We have engineered an upconversion FRET-based switch by combining lanthanide-doped UCNPs and fluorophores that demonstrates excitonic energy upconversion by nearly a factor of 2, an excited state donor to acceptor FRET efficiency of nearly 25%, and an acceptor fluorophore quantum efficiency that is close to unity. These findings offer a promising path for energy upconversion in nanophotonic applications including artificial light harvesting, excitonic circuits, photovoltaics, nanomedicine, and optoelectronics.