Efficient red electroluminescence from diketopyrrolopyrrole copolymerised with a polyfluorene

O. Fenwick, S. Fusco, T. N. Baig, F. Di Stasio, T.T. Steckler, P. Henriksson, C. Fléchon, M.R. Andersson, F. Cacialli

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
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Abstract

We report the synthesis, characterization, and device incorporation of copolymers based on a common green-emitting polyfluorene but containing a small proportion of a low energy gap donor-acceptor-donor unit for red emission in photo- and electro-luminescence. At just 1%-3% random incorporation, the low-gap unit is not present on all chains, yet we demonstrate that efficient charge and energy transfer can yield electroluminescent devices with 1% quantum efficiency and a color that can be tuned by adjusting the density of low-gap units to achieve primary red (National Television System Committee). The high current density tail off in the efficiency is reduced by replacing the hole-injection layer with a photochemically cross-linked electronâ'blocking layer.

Original languageEnglish
Article number032108
Number of pages7
JournalAPL Materials
Volume1
Issue number3
DOIs
Publication statusPublished - 6 Sep 2013
Externally publishedYes

Bibliographical note

(CC-BY 4.0) Open Access article licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license (http://creativecommons.org/licenses/by/4.0).

Keywords

  • red electroluminescence
  • efficiency
  • copolymers
  • Light Emitting Diodes
  • polymer light-emitting diodes

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