Electroluminescent Nematic Polymer Networks with Polarised Emission

Electroluminescence with a polarisation ratio of 12:1 from a uniformly aligned nematic network is reported. Diene photo-active end-groups were used, which polymerise by a selective cyclisation reaction. Surface alignment was achieved for the first time using a doped polymer photoalignment layer, ori...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Molecular crystals and liquid crystals, 2001-08, Vol.364 (1), p.511-518
Main Authors: Contoret, Adam, Farrar, Simon, Jackson, Perregrin, Kelly, Stephen M., Khan, Sultan, Nicholls, Edward, O'Neill, Mary, Richards, Gary
Format: Article
Language:English
Subjects:
Application fields
Applied sciences
Electronics
Exact sciences and technology
networks
Optoelectronic devices
organic electroluminescence
polarised EL
Polymer industry, paints, wood
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Technology of polymers
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Summary:Electroluminescence with a polarisation ratio of 12:1 from a uniformly aligned nematic network is reported. Diene photo-active end-groups were used, which polymerise by a selective cyclisation reaction. Surface alignment was achieved for the first time using a doped polymer photoalignment layer, oriented by exposure to polarised UV light. Threshold voltages between 2 V and 8 V were found and a brightness of 90 cd m −2 was obtained. Both the PL and EL intensities were higher after photochemical crosslinking.
ISSN:1058-725X
DOI:10.1080/10587250108025021