We report absolute photoluminescence (PL) and electroluminescence quantum efficiencies for thin films and polymer light-emitting diodes prepared with regioregular (that is, exclusively head-to-head/tail-to-tail conformation and/or exclusively head-to-tail conformation) poly(alkylthiophenes). In particular, we find a maximum PL quantum efficiency of ∼11% for the head-to-head/tail-to-tail conformers, an order of magnitude higher than for the head-to-tail conformers. The results show that chemical conformation plays a crucial role in determining the material electronic structure and, hence, the relevant optical properties. The results are significant to the wide field of conjugated, synthetic, light-emitting materials, and hence to the development of large-area organic displays.
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1 December 1998
Research Article|
December 01 1998
Efficient photo and electroluminescence of regioregular poly(alkylthiophene)s
Piotr Barta;
Piotr Barta
Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, PL-30-059 Krakow, al.Mickiewicza 30, Poland
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Franco Cacialli;
Franco Cacialli
Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom
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Richard H. Friend;
Richard H. Friend
Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom
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Małgorzata Zagórska
Małgorzata Zagórska
Faculty of Chemistry, Warsaw University of Technology, PL 00 664 Warsaw, ul.Noakowskiego 3, Poland
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J. Appl. Phys. 84, 6279–6284 (1998)
Article history
Received:
April 23 1998
Accepted:
June 24 1998
Citation
Piotr Barta, Franco Cacialli, Richard H. Friend, Małgorzata Zagórska; Efficient photo and electroluminescence of regioregular poly(alkylthiophene)s. J. Appl. Phys. 1 December 1998; 84 (11): 6279–6284. https://doi.org/10.1063/1.368949
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