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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.

Presentation Conference Type Conference Paper (unpublished)
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
APA6 Citation 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
Keywords Liquid crystals, reactive mesogens, photoluminescence, organic semiconductor, crosslinking, fourier transform infra-red spectroscopy, polymer network