Engineering Circularly Polarized Light Emission in Nanostructured Oligodimethylsiloxane-Helicene Chiral Materials - Archive ouverte HAL
Article Dans Une Revue Nanoscale Année : 2024

Engineering Circularly Polarized Light Emission in Nanostructured Oligodimethylsiloxane-Helicene Chiral Materials

Bart van den Bersselaar
Bas de Waal
  • Fonction : Auteur
Marie Cordier
Stefan Meskers
Jeanne Crassous

Résumé

Chiroptical properties in the bulk can be tuned by controlling the formation of chiral ordered nanostructures. Here, we present a series of discrete oligodimethylsiloxane-helicene-pyrene (oDMS-Hel) block molecules with varying oDMS lengths and study the nanostructures formed in both bulk and solution, including their chiroptical properties. In bulk, ordered 2D nanostructures self-assemble, driven by phase segregation induced by the siloxane oligomers, with clear differences in the properties of the racemate and enantiopure versions. Moreover, intermolecular pyrene interactions lead to excimer emission. As a result, up to a 5-fold increase in circularly polarized luminescence is observed in the solid state as compared to the solution, accompanied by a clear influence of the pyrene excimer emission on the overall emission process. Interestingly, in the ordered lamellar packing obtained from long oDMS units, the excimer emission shows very little net circular polarization, while in the disordered state found with shorter oDMS, this excimer emission displays a significant degree of circular polarization.

These results demonstrate that functionalizing chiroptical building blocks with discrete oligodimethylsiloxane chains is a versatile strategy to control photophysical properties and modulate chiroptical emission in bulk. This approach advances the integration of chiroptical materials into devices, enabling diverse applications ranging from optoelectronics to communication technologies.

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Chimie
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vendredi 18 avril 2025
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Dates et versions

hal-04763001 , version 1 (01-11-2024)

Identifiants

Citer

Stefano Cadeddu, Bart van den Bersselaar, Bas de Waal, Marie Cordier, Nicolas Vanthuyne, et al.. Engineering Circularly Polarized Light Emission in Nanostructured Oligodimethylsiloxane-Helicene Chiral Materials. Nanoscale, 2024, ⟨10.1039/d4nr03389b⟩. ⟨hal-04763001⟩
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