The decoupling of electrical performance from electroluminescence was demonstrated in a high mobility polymer semiconductor using efficient RET to a highly fluorescent squaraine dye. This is accomplished by choosing an acceptor molecule with a suitably large spectral overlap with the polymer, which overcomes the low FQY inherent in low bandgap polymers, even in very low concentrations. The resulting bright NIR OLEDs compete with state of the art inorganic devices such as recent perovskite and quantum dot NIR OLEDs. Interestingly the mobilities achieved here were high despite the lack of any above room temperature annealing step or long range structural order. This solidifi es the argument that long-range order is not necessary for efficient charge transport. Finally, this gives further evidence that the charge transport is not negatively affected by introducing SQ3 into the thin film.
|Original language||English (US)|
|Number of pages||8|
|State||Published - Aug 2016|
Bibliographical noteFunding Information:
The authors gratefully acknowledge funding from the Engineering and Physical Sciences Research Council (EPSRC) through a Programme Grant No. EP/M005143/1. The authors would like to thank the Doctoral Training Centre in Plastic Electronics EP/G037515/1.K.B. acknowledges financial support by the Deutsche Forschungsgemeinschaft (BR-4869/1-1). The group at Würzburg would like to acknowledge support from the Deutsche Forschungsgemeinschaft (DFG Research Unit FOR 1809) and from the SolTech Initiative of the Bavarian State Ministry of Science, Research and the Arts. D.H. and K.B. would like to thank Dr. Jirˇi Novak and Jakub Rozborˇil (Central European Institute of Technology, Masaryk University, Czech Republic) and Dr. Tom Arnold (Diamond Light Source, Didcot, UK) for assistance during the synchrotron experiment and Diamond Light Source, Didcot, UK for financial support.
- energy transfer
- organic LEDs
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering