Efficient red electroluminescence from diketopyrrolopyrrole copolymerised with a polyfluorene
Journal article, 2013

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 electroluminescence. 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-blocking layer.

Author

O. Fenwick

University College London (UCL)

Sandra Fusco

Chalmers, Chemical and Biological Engineering, Industrial biotechnology

T. N Baig

University College London (UCL)

F. Di Stasio

University College London (UCL)

Timothy Steckler

Chalmers, Chemical and Biological Engineering, Polymer Technology

Patrik Henriksson

Chalmers, Chemical and Biological Engineering, Polymer Technology

C. Flechon

University College London (UCL)

Mats Andersson

Chalmers, Chemical and Biological Engineering, Polymer Technology

F. Cacialli

University College London (UCL)

APL Materials

2166-532X (eISSN)

Vol. 1 3 Art. no. 032108- 032108

Subject Categories

Chemical Sciences

DOI

10.1063/1.4820433

More information

Latest update

2/28/2018