Ultrafast fluorescence spectroscopy unravels efficient exciton transport within dye-loaded organic nanoparticles

Amira Mounya Gharbi; Deep Sekhar Biswas; Pavel Malý; Andrey Klymchenko; Jérémie Léonard

doi:10.1117/12.3017429

11 June 2024 Ultrafast fluorescence spectroscopy unravels efficient exciton transport within dye-loaded organic nanoparticles

Amira Mounya Gharbi, Deep Sekhar Biswas, Pavel Malý, Andrey Klymchenko, Jérémie Léonard

Author Affiliations +

Proceedings Volume PC12992, Advances in Ultrafast Condensed Phase Physics IV; PC129920T (2024) https://doi.org/10.1117/12.3017429
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

In this work, we utilize time-resolved fluorescence spectroscopy to investigate the exciton diffusion properties of polymeric, organic nanoparticles loaded with fluorescent dyes, which mimic the role of natural light-harvesting complexes found in photosynthetic organisms. We employ polarization-resolved fluorescence up-conversion spectroscopy to track the kinetics of fluorescence anisotropy decay, unravelling the timescales of homo- Exciton Energy Transfer (EET). Additionally, we employ photoluminescence spectroscopy to study the fluence-dependent population decay kinetics, uncovering the Singlet-Singlet exciton Annihilation (SSA) mechanism. Moreover, we explore the population kinetics of donor dyes when co-encapsulated with a fluorescent acceptor at low concentrations within the ONPs. From the measured parameters, we deduce a diffusion constant of ~0.5 nm^2/ps, resulting in a diffusion length as large as 70 nm, i.e. twice as large as the ONP diameter.

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Citation Download Citation

Amira Mounya Gharbi, Deep Sekhar Biswas, Pavel Malý, Andrey Klymchenko, and Jérémie Léonard "Ultrafast fluorescence spectroscopy unravels efficient exciton transport within dye-loaded organic nanoparticles", Proc. SPIE PC12992, Advances in Ultrafast Condensed Phase Physics IV, PC129920T (11 June 2024); https://doi.org/10.1117/12.3017429

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KEYWORDS

Excitons

Diffusion

Fluorescence spectroscopy

Nanoparticles

Ultrafast laser spectroscopy

Diseases and disorders

Dyes

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