Short contacts between chains enhancing luminescence quantum yields and carrier mobilities in conjugated copolymers.

Tudor H Thomas, David J Harkin, Alexander J Gillett, Vincent Lemaur, Mark Nikolka, Aditya Sadhanala, Johannes M Richter, John Armitage, Hu Chen, Iain McCulloch, S Matthew Menke, Yoann Olivier, David Beljonne, Henning Sirringhaus

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Efficient conjugated polymer optoelectronic devices benefit from concomitantly high luminescence and high charge carrier mobility. This is difficult to achieve, as interchain interactions, which are needed to ensure efficient charge transport, tend also to reduce radiative recombination and lead to solid-state quenching effects. Many studies detail strategies for reducing these interactions to increase luminescence, or modifying chain packing motifs to improve percolation charge transport; however achieving these properties together has proved elusive. Here, we show that properly designed amorphous donor-alt-acceptor conjugated polymers can circumvent this problem; combining a tuneable energy gap, fast radiative recombination rates and luminescence quantum efficiencies >15% with high carrier mobilities exceeding 2.4 cm2/Vs. We use photoluminescence from exciton states pinned to close-crossing points to study the interplay between mobility and luminescence. These materials show promise towards realising advanced optoelectronic devices based on conjugated polymers, including electrically-driven polymer lasers.
Original languageEnglish (US)
JournalNature communications
Volume10
Issue number1
DOIs
StatePublished - Jun 13 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We thank the Engineering and Physical Sciences Research Council (EPSRC) for funding through a programme grant (EP/M005143/1). T.H.T. thanks EPSRC for an Industrial CASE studentship, as well as the Cambridge Commonwealth Trust for funding. D.H. would like to thank the Doctoral Training Centre in Plastic Electronics EP/G037515/1, the Worshipful Company of Armourers and Brasiers, and St. Edmunds College, Cambridge. M.N. acknowledges financial support from the European Commission through a Marie-Curie Individual Fellowship (747461). We thank Aurélie Morley and Merck Chemicals Ltd. for providing IDT-F2BT, IDTT-H2BT and IDTT-F2BT. The work in Mons was supported by the Belgian National Science Foundation, F.R.S.-FNRS and by the European Commission/Région Wallonne (FEDER–BIORGEL project). Computational resources have been provided by the Consortium des Équipements de Calcul Intensif (CÉCI), funded by F.R.S.-FNRS under Grant No. 2.5020.11, as well as the Tier-1 supercomputer of the Fédération Wallonie-Bruxelles, infrastructure funded by the Walloon Region under the grant agreement n1117545. The research in Mons is also through the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 646176 (EXTMOS project). D.B. is a FNRS Research Director.

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