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Foldable semi-ladder polymers: novel aggregation behavior and high-performance solution-processed organic
Dafei Yuan1, Mohammad A Awais1, Valerii Sharapov1
1Department of Chemistry, The James Franck Institute, The University of Chicago 929 E 57th Street Chicago Illinois 60601 USA lupingyu@uchicago.edu.
Abstract:
A critical issue in developing high-performance organic light-emitting transistors (OLETs) is to balance the trade-off between charge transport and light emission in a semiconducting material. Although traditional materials for organic light-emitting diodes (OLEDs) or organic field-effect transistors (OFETs) have shown modest performance in OLET devices, design strategies towards high-performance OLET materials and the crucial structure-performance relationship remain unclear. Our research effort in developing cross-conjugated weak acceptor-weak donor copolymers for luminescent properties lead us to an unintentional discovery that these copolymers form coiled foldamers with intramolecular H-aggregation, leading to their exceptional OLET properties. An impressive external quantum efficiency (EQE) of 6.9% in solution-processed multi-layer OLET devices was achieved.
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