Linearly polarised organic light-emitting diodes (OLEDs): synthesis and characterisation of a novel hole-transporting photoalignment copolymer

Aldred, M.P. and Vlachos, P. and Contoret, A.E.A. and Farrar, S.R. and Chung-Tsoi, W. and Mansoor, B. and Woon, K.L. and Hudson, R. and Kelly, S.M. and O'Neill, M. (2005) Linearly polarised organic light-emitting diodes (OLEDs): synthesis and characterisation of a novel hole-transporting photoalignment copolymer. Journal of Materials Chemistry, 15. pp. 3208-3213. ISSN 0959-9428

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Official URL: http://pubs.rsc.org/en/Content/ArticleLanding/2005...

Abstract

We describe the synthesis and characterisation of a novel hole transporting photoalignment copolymer for linearly polarised emission. The copolymer has a coumarin side-chain which undergoes (2 + 2) cycloaddition on irradiation with ultraviolet light. A fluorene side-chain, whose ionisation potential is well matched to the work-function of indium tin oxide, provides hole transporting properties. Polarised green electroluminescence was obtained by spin coating a novel polymerisable and light-emitting liquid crystal onto the photoaligned copolymer. A polarisation ratio value of 13 : 1 and a polarised irradiance of 200 cd m−2 was obtained at 9 V. Polarised red emission is also described in a guest–host configuration. The spatial patterning of the polarisation direction is also shown.

Item Type: Article
Uncontrolled Keywords: Linearly polarised; Organic light-emitting diodes; Novel hole-transporting photoalignment copolymer
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 27 Feb 2015 01:53
Last Modified: 27 Feb 2015 01:53
URI: http://eprints.um.edu.my/id/eprint/12891

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