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 Gen. 2015
Accepted: 04 Cʼhwe. 2015
First published: 17 Cʼhwe. 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

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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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