Thia- and selena-diazole containing polymers for near-infrared light-emitting diodes

Giulia Tregnago; Timothy T. Steckler; Oliver Fenwick; Mats R. Andersson; Franco Cacialli

doi:10.1039/C5TC00118H

Thia- and selena-diazole containing polymers for near-infrared light-emitting diodes†

Giulia Tregnago,^a Timothy T. Steckler,^b Oliver Fenwick,^c Mats R. Andersson^bd and Franco Cacialli*^a

* Corresponding authors

^a Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London, UK
E-mail: f.cacialli@ucl.ac.uk

^b Chalmers University of Technology, Gothenburg, Sweden

^c ISIS & icFRC, Université de Strasbourg & CNRS, 8, allée Gaspard Monge, 67000 Strasbourg, France

^d Ian Wark Research Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia

Abstract

We report the optical characterization of near-infrared (NIR) emitters for polymer light-emitting diode (PLEDs) applications based on the copolymerization of a phthalimide-thiophene host polymer with a low-gap emitter containing the bisthienyl(benzotriazolothiadiazole) unit. We investigate different loadings of the low-gap emitter (in the range 1–3% by weight) and the substitution of a sulphur atom with a selenium atom to further extend the emission in the NIR up to 1000 nm. PLEDs based on copolymers with 1% loading give the best efficiency (0.09%) and show an almost pure NIR EL (95% in the NIR) peaking at 895 nm.

This article is part of the themed collection: Highlighting materials research in the UK for optical, magnetic and electronic devices

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DOI: https://doi.org/10.1039/C5TC00118H
Article type: Communication
Submitted: 13 Jan 2015
Accepted: 04 Feb 2015
First published: 17 Feb 2015
This article is Open Access

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J. Mater. Chem. C, 2015,3, 2792-2797

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Thia- and selena-diazole containing polymers for near-infrared light-emitting diodes

G. Tregnago, T. T. Steckler, O. Fenwick, M. R. Andersson and F. Cacialli, J. Mater. Chem. C, 2015, 3, 2792 DOI: 10.1039/C5TC00118H

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Journal of Materials Chemistry C

Thia- and selena-diazole containing polymers for near-infrared light-emitting diodes†

Abstract

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Thia- and selena-diazole containing polymers for near-infrared light-emitting diodes

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