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Design de nanofils luminescents organiques et hybrides à base de clusters de composés de métaux de transition

Abstract : Luminescent organic nanostructures are of great importance as building blocks in future miniaturized photonic and optoelectronic devices because these systems rely upon the ability to tune and get new optical characteristics. One-dimensional luminescent nanostructures are new and promising systems with complex morphologies now available. In this work, we particularly investigated the control and the tuning of the emitted color of two-luminophore based nanowires. In a first part, an unfamiliar family of luminophore has been investigated: the octahedral molybdenum clusters. The vibrational modes frequencies of Mo6Br14 cluster were fully determined, as well as their photophysical properties. The unique features of these clusters were exploited into nanowires.Then, using a template method, we designed coaxial nanowires allowing the spatial separation of the two luminophores. The transition metal clusters in a PMMA matrix and PPV were selected as red and green emitters, respectively, to achieve the spectral separation. Remarkably, it was found from time-resolved photoluminescence study and confirmed by a phenomenological model that any charge or energy transfer is involved in this system.Alternatively, coaxial and blend designs were used to investigate and possibly tune energy/charge transfers involved in the donor-acceptor behavior of two conjugated polymers: PFO (blue emitter) and F8T2 (green emitter). These results demonstrate the great versatility of polymer-based nanowires to finely control at the nanoscale the emission features of multi-luminophore materials.
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https://tel.archives-ouvertes.fr/tel-00950272
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Submitted on : Tuesday, March 25, 2014 - 2:22:17 PM
Last modification on : Tuesday, December 14, 2021 - 10:26:03 AM
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GARREAU_2013LEMA1016.pdf
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  • HAL Id : tel-00950272, version 2

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Alexandre Garreau. Design de nanofils luminescents organiques et hybrides à base de clusters de composés de métaux de transition. Autre [cond-mat.other]. Université du Maine, 2013. Français. ⟨NNT : 2013LEMA1016⟩. ⟨tel-00950272v2⟩

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