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arXiv · 2101.01410

Highly Polarized Light Emission from 6T@BNNT Nanohybrids

A. Badon·C. Allard·F. Fossard·A. Loiseau·L. Cognet·E. Flahaut·N. Izard·R. Martel·E. Gaufrès
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Abstract

The polarized fluorescence emission of organic fluorophores has been extensively studied in photonics and is increasingly exploited in single molecule scale bio-imaging. Expanding the polarization properties of compact molecular assemblies is, however, extremely challenging due to depolarization and quenching effects associated with the self-aggregation of molecules into the sub-nanometer scale. Here we demonstrate that Boron Nitride Nanotubes (BNNTs) can act as a 1D host-template for the alignment of encapsulated a-sexithiophene (6T) inside BNNTs, leading to an optically active 6T@BNNT nanohybrid. We show that the fluorescence from the nanohybrid is strongly polarized with extinction ratios as high as 700 at room temperature. A statistical analysis of the 6T orientation inside BNNTs with inner diameter up to 1.5 nm shows that at least 80% of the encapsulated 6Ts exhibit a maximum deviation angle of less than 10{\deg} with respect to the BNNT axis. Despite a competition between molecule-molecule and molecule-BNNT adsorption in larger BNNTs, our results also show that more than 80% of the molecules display a preferential orientation along the BNNT axis with a deviation angle below 45{\deg}.

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A. Badon, C. Allard, F. Fossard, A. Loiseau, L. Cognet, E. Flahaut, N. Izard, R. Martel, E. Gaufrès. 2021-01-05. Highly Polarized Light Emission from 6T@BNNT Nanohybrids. https://arxiv.org/abs/2101.01410

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