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Photopolymerization studies of a light-emitting liquid crystal with methacrylate reactive groups for electroluminescence

Woon, Kai L.; Liedtke, Alicia; O'Neill, Mary; Aldred, Matthew P.; Kitney, Stuart P.; Vlachos, Panagiotis; Bruneau, Amaury; Kelly, Stephen M.


Kai L. Woon

Alicia Liedtke

Mary O'Neill

Matthew P. Aldred

Stuart P. Kitney

Panagiotis Vlachos

Amaury Bruneau


Iam Choon Khoo


Light-emitting reactive mesogens are promising materials for photolithographically processable organic light-emitting diodes (OLEDs). We study the photopolymerization of a fluorene-based mesogen with methacrylate photoreactive groups. We find that there is no significant change in the photoluminescence quantum efficiency when the mesogen is photopolymerized in a glovebox with oxygen and water concentration at < 20 parts per million. There is significant quenching of luminescence when the photopolymerization is carried out in a less controlled environment. A real-time measurement is used to monitor changes in the FTIR spectrum of the compound during polymerization. No photo-initiator is added to the mesogen suggesting that the photopolymerization is self-initiated by the chromophore. We show that the self-initiation does not proceed by fragmentation of the aromatic core and suggest an alternative mechanism.


Woon, K. L., Liedtke, A., O'Neill, M., Aldred, M. P., Kitney, S. P., Vlachos, P., …Kelly, S. M. Photopolymerization studies of a light-emitting liquid crystal with methacrylate reactive groups for electroluminescence. Paper presented at Liquid Crystals XII

Presentation Conference Type Conference Paper (unpublished)
Conference Name Liquid Crystals XII
Acceptance Date Dec 31, 2008
Publication Date Aug 28, 2008
Journal Proceedings of SPIE - The International Society for Optical Engineering
Print ISSN 0277-786X
Publisher Society of Photo-optical Instrumentation Engineers
Peer Reviewed Peer Reviewed
Volume 7050
Article Number 70500E
Pages 0 - 0
Keywords Liquid crystals, reactive mesogens, photoluminescence, organic semiconductor, crosslinking, fourier transform infra-red spectroscopy, polymer network
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