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High brightness deep blue/violet fluorescent polymer light-emitting diodes (PLEDs)

Cook, Javan H.; Santos, José; Al-Attar, Hameed A.; Bryce, Martin R.; Monkman, Andrew P.

High brightness deep blue/violet fluorescent polymer light-emitting diodes (PLEDs) Thumbnail


Authors

Javan H. Cook

José Santos

Hameed A. Al-Attar

Andrew P. Monkman



Abstract

Two new deep blue/violet emitting alternating co-polymers, comprising readily-available carbazole (C) and fluorene (F) monomer units, have been synthesised and shown to produce extremely bright solution-processed polymer light-emitting diodes (PLEDs) with the structure ITO/PEDOT:PSS/polymer/TPBi/LiF/Al. The para-conjugated polymer, CF1, gave PLED devices with external quantum efficiency (EQE) values of ηext,max 1.4%, Lmax of 565 cd m−2 with CIEx,y (0.16, 0.07). The EQE was raised to ηext,max 2.1%, after the addition of a TAPC hole injection layer. For the isomeric meta-conjugated polymer, CF2, values of ηext,max 0.35%, Lmax of 16 cd m−2 with CIEx,y (0.18, 0.12) were obtained. The λELmax was 409 nm for both the CF1 and CF2 devices. The CF1 devices also possess low turn-on and low operating voltages for devices of such high brightness. Moreover, the CF1 emission is very stable from 10 cd m−2 up to peak brightness, with only a negligible shift in CIE coordinates. The combination of a simple co-polymer structure synthesised using readily-available monomer units, and high brightness and good colour stability from a simple device architecture, makes CF1 suitable for a wide range of applications requiring deep blue/violet emission.

Citation

Cook, J. H., Santos, J., Al-Attar, H. A., Bryce, M. R., & Monkman, A. P. (2015). High brightness deep blue/violet fluorescent polymer light-emitting diodes (PLEDs). Journal of Materials Chemistry C Materials for optical and electronic devices, 3(37), 9664-9669. https://doi.org/10.1039/c5tc02162f

Journal Article Type Article
Acceptance Date Aug 25, 2015
Publication Date Oct 7, 2015
Deposit Date Oct 7, 2015
Publicly Available Date Sep 2, 2016
Journal Journal of Materials Chemistry C Materials for optical and electronic devices
Print ISSN 2050-7526
Electronic ISSN 2050-7534
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 3
Issue 37
Pages 9664-9669
DOI https://doi.org/10.1039/c5tc02162f

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Copyright Statement
This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.





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