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Proceedings Paper

Photopolymerization studies of a light-emitting liquid crystal with methacrylate reactive groups for electroluminescence
Author(s): Kai L Woon; Alicia Liedtke; Mary O'Neill; Matthew P. Aldred; Stuart P. Kitney; Panagiotis Vlachos; Amaury Bruneau; Stephen M. Kelly
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Paper Abstract

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 photo-polymerization 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.

Paper Details

Date Published: 27 August 2008
PDF: 8 pages
Proc. SPIE 7050, Liquid Crystals XII, 70500E (27 August 2008); doi: 10.1117/12.794248
Show Author Affiliations
Kai L Woon, Univ. of Hull (United Kingdom)
Alicia Liedtke, Univ. of Hull (United Kingdom)
Mary O'Neill, Univ. of Hull (United Kingdom)
Matthew P. Aldred, Univ. of Hull (United Kingdom)
Stuart P. Kitney, Univ. of Hull (United Kingdom)
Panagiotis Vlachos, Univ. of Hull (United Kingdom)
Amaury Bruneau, Univ. of Hull (United Kingdom)
Stephen M. Kelly, Univ. of Hull (United Kingdom)

Published in SPIE Proceedings Vol. 7050:
Liquid Crystals XII
Iam Choon Khoo, Editor(s)

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