Nanophotonic Approach to Study Excited-State Dynamics in Semiconductor Nanocrystals
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Date
2022-05-12
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Journal Article
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Abstract
In semiconductor nanocrystals, excited electrons relax through multipleradiative and nonradiative pathways. This complexity complicates characterization of theirdecay processes with standard time- and temperature-dependent photoluminescence studies.Here, we exploit a simple nanophotonic approach to augment such measurements and toaddress open questions related to nanocrystal emission. We place nanocrystals at differentdistances from a gold reflector to affect radiative rates through variations in the local density ofoptical states. We apply this approach to spherical CdSe-based nanocrystals to probe theradiative efficiency and polarization properties of the lowest dark and bright excitons byanalyzing temperature-dependent emission dynamics. For CdSe-based nanoplatelets, we identify the charge-carrier trappingmechanism responsible for strongly delayed emission. Our method, when combined with careful modeling of the influence of thenanophotonic environment on the relaxation dynamics, offers a versatile strategy to disentangle the complex excited-state decaypathways present influorescent nanocrystals as well as other emitters
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published
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Volume
13 (18)
Pages / Article No.
4145 - 4151
Publisher
American Chemical Society
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Subject
plasmonic laser; distributed feedback; surface-relief gratings; semiconductor nanoplatelets; plasmonics
Organisational unit
03875 - Norris, David J. / Norris, David J.
Notes
Funding
339905 - Quantum-Dot Plasmonics and Spasers (EC)
165559 - Optical Strong Coupling in Colloidal Quantum Dots (SNF)
165559 - Optical Strong Coupling in Colloidal Quantum Dots (SNF)