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

Authors

• M.P. Aldred
• P. Vlachos
• A.E.A. Contoret
• S.R. Farrar
• W. Chung-Tsoi
• B. Mansoor
• K.L. WoonFollow
• R. Hudson
• S.M. Kelly
• M. O'Neill

Document Type

Article

Publication Date

6-30-2005

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.

Keywords

Linearly polarised, Organic light-emitting diodes, Novel hole-transporting photoalignment copolymer

Publication Title

Journal of Materials Chemistry

ISSN

0959-9428

Recommended Citation

Aldred, M.P.; Vlachos, P.; Contoret, A.E.A.; Farrar, S.R.; Chung-Tsoi, W.; Mansoor, B.; Woon, K.L.; Hudson, R.; Kelly, S.M.; and O'Neill, M., "Linearly polarised organic light-emitting diodes (OLEDs): synthesis and characterisation of a novel hole-transporting photoalignment copolymer" (2005). Research Publications (2000 to 2005). 1351.
https://knova.um.edu.my/research_publications_2000_2005/1351

Divisions

PHYSICS

Volume

15

Publisher

Royal Society of Chemistry