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

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

doi:10.1117/12.794248

27 August 2008 Photopolymerization studies of a light-emitting liquid crystal with methacrylate reactive groups for electroluminescence

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

Author Affiliations +

Proceedings Volume 7050, Liquid Crystals XII; 70500E (2008) https://doi.org/10.1117/12.794248
Event: Photonic Devices + Applications, 2008, San Diego, California, United States

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.

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Kai L Woon, Alicia Liedtke, Mary O'Neill, Matthew P. Aldred, Stuart P. Kitney, Panagiotis Vlachos, Amaury Bruneau, and Stephen M. Kelly "Photopolymerization studies of a light-emitting liquid crystal with methacrylate reactive groups for electroluminescence", Proc. SPIE 7050, Liquid Crystals XII, 70500E (27 August 2008); https://doi.org/10.1117/12.794248

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