High Circular Polarization of Electroluminescence Achieved via Self-Assembly of a Light-Emitting Chiral Conjugated Polymer into Multidomain Cholesteric Films

Daniele Di Nuzzo; Chidambar Kulkarni; Baodan Zhao; Eilam Smolinsky; Francesco Tassinari; Stefan C. J. Meskers; Ron Naaman; E. W. Meijer; Richard H. Friend

doi:10.1021/acsnano.7b07390

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High Circular Polarization of Electroluminescence Achieved via Self-Assembly of a Light-Emitting Chiral Conjugated Polymer into Multidomain Cholesteric Films

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High Circular Polarization of Electroluminescence Achieved via Self-Assembly of a Light-Emitting Chiral Conjugated Polymer into Multidomain Cholesteric Films

Daniele Di Nuzzo, Chidambar Kulkarni, Baodan Zhao, Eilam Smolinsky, Francesco Tassinari, Stefan C. J. Meskers, Ron Naaman, E. W. Meijer and Richard H. Friend

ACS Nano, Vol.11(12), pp.12713-12722

Dec/2017

DOI: https://doi.org/10.1021/acsnano.7b07390

PMID: 29182859

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Abstract

We demonstrate a facile route to obtain high and broad-band circular polarization of electroluminescence in single-layer polymer OLEDs. As a 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 multidomain cholesteric film. By varying the thickness of the polymer emitting layer, we achieve high levels of circular polarization of electroluminescence (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 the direction of 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.

self-assembly

OLEDs

chirality

circularly polarized luminescence

light-emitting polymers

Details

Title: High Circular Polarization of Electroluminescence Achieved via Self-Assembly of a Light-Emitting Chiral Conjugated Polymer into Multidomain Cholesteric Films
Creators: Daniele Di Nuzzo (Corresponding Author) - University of Cambridge (United Kingdom, Cambridge)
Chidambar Kulkarni (null) - Eindhoven University of Technology (Netherlands, Eindhoven) - TU/e
Baodan Zhao (null) - University of Cambridge (United Kingdom, Cambridge)
Eilam Smolinsky (null) - The Weizmann Institute of Science, Department of Chemical and Biological Physics
Francesco Tassinari - 972WIS_INST___136
Stefan C. J. Meskers (null) - Eindhoven University of Technology (Netherlands, Eindhoven) - TU/e
Ron Naaman (null) - The Weizmann Institute of Science, Department of Chemical and Biological Physics
E. W. Meijer (null) - Eindhoven University of Technology (Netherlands, Eindhoven) - TU/e
Richard H. Friend (null) - University of Cambridge (United Kingdom, Cambridge)
Resource Type: Journal article
Publication Details: ACS Nano, Vol.11(12), pp.12713-12722; Dec/2017
Number of pages: 10
Language: English
DOI: https://doi.org/10.1021/acsnano.7b07390
PMID: 29182859
Grant note: D.D.N. and R.H.F. acknowledge financial support from the Engineering and Physical Sciences Research Council of the UK (EPSRC). C.K. and E.W.M. acknowledge financial support from the Dutch Ministry of Education, Culture and Science (Gravity program 024.001.035). C.K. is grateful for financial support from a Marie Skłodowska-Curie (704830) postdoctoral fellowship.
Record Identifier: 993262897303596

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