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 language | English (US) |
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Pages (from-to) | 220-227 |
Number of pages | 8 |
Journal | Organic Electronics |
Volume | 32 |
DOIs | |
State | Published - May 2016 |
Bibliographical note
Publisher Copyright:© 2016 The Authors.
Keywords
- Ambipolar
- Donor-acceptor polymers
- Electroluminescence
- Field-effect transistors
- Photoluminescence
- Polaron quenching
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Biomaterials
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry
- Electrical and Electronic Engineering