High Circular Polarization of Electroluminescence Achieved via Self-Assembly of a Light-Emitting Chiral Conjugated Polymer into Multidomain Cholesteric Films.
American Chemical Society
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Di Nuzzo, D., Kulkarni, C., Zhao, B., Smolinsky, E., Tassinari, F., Meskers, S. C., Naaman, R., et al. (2017). High Circular Polarization of Electroluminescence Achieved via Self-Assembly of a Light-Emitting Chiral Conjugated Polymer into Multidomain Cholesteric Films.. ACS nano, 11 (12), 12713-12722. https://doi.org/10.1021/acsnano.7b07390
We demonstrate a facile route to obtain high and broad-band circular polarization of electro-luminescence in single layer polymer OLEDs. As light emitting material we use a donor-acceptor polyfluorene with enantiomerically pure chiral side-chains. We show that upon thermal annealing the polymer self assembles into a multi-domain cholesteric film. By varying the thickness of the polymer emitting layer, we achieve high levels of circular polarization of electro-luminescence (up to 40% excess of right-handed polarization), which are the highest reported for polymer OLEDs not using chiral dopants or alignment layers. Mueller matrix ellipsometry shows strong optical anisotropies in the film, indicating that the circular polarization of luminescence arises mainly after the photon has been generated, through selective scattering and birefringence correlated in direction to the initial linear polarization of the photon. Our work demonstrates that chirally-substituted conjugated polymers can combine photonic and semiconducting properties in advanced optoelectronic devices.
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External DOI: https://doi.org/10.1021/acsnano.7b07390
This record's URL: https://www.repository.cam.ac.uk/handle/1810/273197
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/
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