Structured Excitation Energy Transfer: Tracking Exciton Diffusion below Sunlight Intensity.
| Autor: | Brinatti Vazquez GD; ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona 08860, Spain., Lo Gerfo Morganti G; ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona 08860, Spain., Vasilev C; School of Biosciences, University of Sheffield, Sheffield S10 2TN, U.K., Hunter CN; School of Biosciences, University of Sheffield, Sheffield S10 2TN, U.K., van Hulst NF; ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona 08860, Spain.; ICREA-Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys 23, Barcelona 08010, Spain. |
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| Jazyk: | angličtina |
| Zdroj: | ACS photonics [ACS Photonics] 2024 Feb 22; Vol. 11 (3), pp. 1318-1326. Date of Electronic Publication: 2024 Feb 22 (Print Publication: 2024). |
| DOI: | 10.1021/acsphotonics.4c00004 |
| Abstrakt: | With the increasing demand for new materials for light-harvesting applications, spatiotemporal microscopy techniques are receiving increasing attention as they allow direct observation of the nanoscale diffusion of excitons. However, the use of pulsed and tightly focused laser beams generates light intensities far above those expected under sunlight illumination, leading to photodamage and nonlinear effects that seriously limit the accuracy and applicability of these techniques, especially in biological or atomically thin materials. In this work, we present a novel spatiotemporal microscopy technique that exploits structured excitation in order to dramatically decrease the excitation intensity, up to 10,000-fold when compared with previously reported spatiotemporal photoluminescence microscopy experiments. We tested our method in two different systems, reporting the first exciton diffusion measurement at illumination conditions below sunlight, both considering average power and peak exciton densities in an organic photovoltaic sample (Y6), where we tracked the excitons for up to five recombination lifetimes. Next, nanometer-scale energy transport was directly observed for the first time in both space and time in a printed monolayer of the light-harvesting complex 2 from purple bacteria. Competing Interests: The authors declare no competing financial interest. (© 2024 The Authors. Published by American Chemical Society.) |
| Databáze: | MEDLINE |
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