Photo- and electroluminescence of ambipolar, high-mobility, donor-acceptor polymers

Martin Held, Yuriy Zakharko, Ming Wang, Florian Jakubka, Florentina Gannott, Joseph W. Rumer, Raja Ashraf, Iain Mcculloch, Jana Zaumseil*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Donor-acceptor polymers with narrow bandgaps are promising materials for bulk heterojunction solar cells and high-mobility field-effect transistors. They also emit light in the near-infrared. Here we investigate and compare the photoluminescence and electroluminescence properties of different narrow bandgap (<1.5 eV) donor-acceptor polymers with diketopyrrolopyrrole (DPP), isoindigo (IGT) and benzodipyrrolidone (BPT) cores, respectively. All of them show near-infrared photoluminescence quantum yields of 0.03-0.09% that decrease with decreasing bandgap. Bottom-contact/top-gate field-effect transistors show ambipolar charge transport with hole and electron mobilities between 0.02 and 0.7 cm2 V-1 s-1 and near-infrared electroluminescence. Their external quantum efficiencies reach up to 0.001%. The effect of polaron quenching and other reasons for the low electroluminescence efficiency of these high mobility polymers are investigated.

Original languageEnglish (US)
Pages (from-to)220-227
Number of pages8
JournalOrganic Electronics
Volume32
DOIs
StatePublished - May 1 2016

Keywords

  • Ambipolar
  • Donor-acceptor polymers
  • Electroluminescence
  • Field-effect transistors
  • Photoluminescence
  • Polaron quenching

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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