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

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