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

doi:10.1063/1.4820433

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

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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 language	English
Article number	032108
Number of pages	7
Journal	APL Materials
Volume	1
Issue number	3
DOIs	https://doi.org/10.1063/1.4820433
Publication status	Published - 6 Sept 2013
Externally published	Yes

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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10.1063/1.4820433Licence: CC BY

Published versionFinal published version, 1.1 MBLicence: CC BY

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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 electron{\^a}'blocking layer.",

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AU - Fenwick, O.

AU - Fusco, S.

AU - Baig, T. N.

AU - Di Stasio, F.

AU - Steckler, T.T.

AU - Henriksson, P.

AU - Fléchon, C.

AU - Andersson, M.R.

AU - Cacialli, F.

N1 - (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).

PY - 2013/9/6

Y1 - 2013/9/6

N2 - 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.

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KW - polymer light-emitting diodes

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ER -

Efficient red electroluminescence from diketopyrrolopyrrole copolymerised with a polyfluorene

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