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An Optically Isotropic Antiferroelectric Liquid Crystal (OI-AFLC) Display Mode Operating over a Wide Temperature Range using Ternary Bent-Core Liquid Crystal Mixtures

  • Author(s): Bergquist, L
  • Zhang, C
  • Ribeiro de Almeida, RR
  • Pellegrene, B
  • Salamonczyk, M
  • Kim, M
  • Hwang, JI
  • Kim, KJ
  • Lee, JH
  • Jákli, A
  • Hegmann, T
  • et al.

Published Web Location

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5390793/
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Abstract

© 2017 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. We report on the synthesis and characterization of bent-core liquid crystal (LC) compounds and the preparation of mixtures that provide an optically isotropic antiferroelectric (OI-AFLC) liquid crystal display mode over a very wide temperature interval and well below room temperature. From the collection of compounds synthesized during this study, we recognized that several ternary mixtures displayed a modulated SmCaPAphase down to below −40 °C and up to about 100 °C on both heating and cooling, as well as optical tilt angles in the transformed state of approximately 45° (optically isotropic state). The materials were fully characterized and their liquid crystal as well as electro-optical properties analyzed by polarized optical microscopy, differential scanning calorimetry, synchrotron X-ray diffraction, dielectric spectroscopy, and electro-optical tests.

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