Efficient Nanosecond Photoluminescence from Infrared PbS Quantum Dots Coupled to Plasmonic Nanoantennas
Author(s)Akselrod, Gleb M.; Li, Ying; Argyropoulos, Christos; Mikkelsen, Maiken H.; Weidman, Mark Clayton; Tisdale, William; ... Show more Show less
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Infrared (IR) light sources with high modulation rates are critical components for on-chip optical communications. Lead-based colloidal quantum dots are promising nonepitaxial materials for use in IR light-emitting diodes, but their slow photoluminescence lifetime is a serious limitation. Here we demonstrate coupling of PbS quantum dots to colloidal plasmonic nanoantennas based on film-coupled metal nanocubes, resulting in a dramatic 1300-fold reduction in the emission lifetime from the microsecond to the nanosecond regime. This lifetime reduction is primarily due to a 1100-fold increase in the radiative decay rate owing to the high quantum yield (65%) of the antenna. The short emission lifetime is accompanied by high antenna quantum efficiency and directionality. This nonepitaxial platform points toward GHz frequency, electrically modulated, telecommunication wavelength light-emitting diodes and single-photon sources.
DepartmentMassachusetts Institute of Technology. Department of Chemical Engineering
American Chemical Society (ACS)
Akselrod, Gleb M. et al. “Efficient Nanosecond Photoluminescence from Infrared PbS Quantum Dots Coupled to Plasmonic Nanoantennas.” ACS Photonics 3.10 (2016): 1741–1746. © 2016 American Chemical Society
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