Decoupling Charge Transport and Electroluminescence in a High Mobility Polymer Semiconductor

David J. Harkin, Katharina Broch, Maximilian Schreck, Harald Ceymann, Andreas Stoy, Chaw Keong Yong, Mark Nikolka, Iain Mcculloch, Natalie Stingelin, Christoph Lambert, Henning Sirringhaus*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

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 languageEnglish (US)
Pages (from-to)6378-6385
Number of pages8
JournalAdvanced Materials
Volume28
Issue number30
DOIs
StatePublished - Jan 1 2016

Keywords

  • NIR
  • energy transfer
  • fluorescence
  • organic LEDs

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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