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Open Access Publications from the University of California

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, Leah;
  • Zhang, Cuiyu;
  • Ribeiro de Almeida, Roberta R;
  • Pellegrene, Brittany;
  • Salamonczyk, Miroslaw;
  • Kim, Matthew;
  • Hwang, Jung-Im;
  • Kim, Kyeong-Jin;
  • Lee, Joun-Ho;
  • Jákli, Antal;
  • Hegmann, Torsten
  • et al.

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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 SmCaPA phase 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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