Low Molar Mass Organosiloxane Liquid Crystalline Dyes for Dye Guest Host Ferroelectric Display Devices

D. Shoosmith Department of Physics and Astronomy, Southampton Liquid Crystal Institute, University of Southampton, Highfield, Southampton, SO17 1BJ, UK

C. Carboni Department of Physics and Astronomy, Southampton Liquid Crystal Institute, University of Southampton, Highfield, Southampton, SO17 1BJ, UK; Department of Physics, Sultan Qaboos University, P.O. Box 36, Al-Kohd 123, Muscat, Sultanate of Oman

S. Perkins Department of Physics and Astronomy, Southampton Liquid Crystal Institute, University of Southampton, Highfield, Southampton, SO17 1BJ, UK

S. Meyer Department of Physics and Astronomy, Southampton Liquid Crystal Institute, University of Southampton, Highfield, Southampton, SO17 1BJ, UK

H. J. Coles Department of Physics and Astronomy, Southampton Liquid Crystal Institute, University of Southampton, Highfield, Southampton, SO17 1BJ, UK; Department of Physics, Sultan Qaboos University, P.O. Box 36, Al-Kohd 123, Muscat, Sultanate of Oman

Abstract

In low molar mass organosiloxane liquid-crystal materials the siloxane moieties micro-separate and aggregate in planes that could be regarded as an effective or virtual two-dimensional polymer backbone. We show that if a siloxane moiety is attached to a dichroic dye molecule, the micro-segregation of the siloxane moieties makes it possible to include a high concentration of the guest dye (more than 50%) in a host organosiloxane solution. This effect, combined with the temperature independent tilt angles achievable with ferroelectric organosiloxane liquid crystals, provide an ideal material for high-contrast surface-stabilised ferroelectric display devices. We present dyed ferroelectric materials with a temperature independent tilt angle greater than 42 degrees, a wide (room temperature to over 100[ddot]C) mesomorphic temperature range and a response time shorter than 500μs in the dye guest host mode.

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Low Molar Mass Organosiloxane Liquid Crystalline Dyes for Dye Guest Host Ferroelectric Display Devices

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Low Molar Mass Organosiloxane Liquid Crystalline Dyes for Dye Guest Host Ferroelectric Display Devices

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