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Conclusions
A
hole-transporting/coumarin photoalignment copolymer
has been synthesised that consists of monomer 1 (rod-like
hole-transporting material) and monomer
2 (coumarin-
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proportion of the hole-transporting material was incorporated
into the copolymer to preserve the alignment properties of
the coumarin moiety. The green chromophore RM 1 was
aligned on this hybrid hole-transporting photoalignment
layer for the production of linearly polarised light, in which
a peak polarisation intensity ratio of 13 : 1 and polarised
electroluminescent irradiance of 200 cd m22 was obtained at
9 V. Optimisation of this new class of patternable hole-
transporting/coumarin photoalignment polymer will almost
certainly lead to much higher values for the polarisation ratio.
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Acknowledgements
The European Union (Photoledd), EPSRC and ZLX Techno
Ltd are thanked for financial support.
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