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

Here, 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 SmC aP A 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.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5] ;  [5] ;  [5] ;  [1] ;  [6]
  1. Kent State Univ., Kent, OH (United States). Liquid Crystal Inst., Chemical Physics Interdisciplinary Program
  2. Kent State Univ., Kent, OH (United States). Liquid Crystal Inst., Chemical Physics Interdisciplinary Program; Federal Univ. of Technology, Apucarana PR (Brazil). Dept. of Physics
  3. Kent State Univ., Kent, OH (United States). Dept. of Chemistry and Biochemistry
  4. Kent State Univ., Kent, OH (United States). Liquid Crystal Inst., Chemical Physics Interdisciplinary Program; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  5. LG Display Co., Ltd., Wollong-myeon, Paju-si, Gyeonggi-do (South Korea)
  6. Kent State Univ., Kent, OH (United States). Liquid Crystal Inst., Chemical Physics Interdisciplinary Program; Kent State Univ., Kent, OH (United States). Dept. of Chemistry and Biochemistry
Publication Date:
Grant/Contract Number:
AC02-05CH11231; CHE-1263087
Type:
Published Article
Journal Name:
ChemistryOpen
Additional Journal Information:
Journal Volume: 6; Journal Issue: 2; Journal ID: ISSN 2191-1363
Publisher:
ChemPubSoc Europe
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; antiferroelectric liquid crystal display; bent-core liquid crystals; optically isotropic; polar smectic; room-temperature switching
OSTI Identifier:
1351644
Alternate Identifier(s):
OSTI ID: 1351645; OSTI ID: 1408427

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, and Hegmann, Torsten. An Optically Isotropic Antiferroelectric Liquid Crystal (OI-AFLC) Display Mode Operating over a Wide Temperature Range using Ternary Bent-Core Liquid Crystal Mixtures. United States: N. p., Web. doi:10.1002/open.201600138.
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. An Optically Isotropic Antiferroelectric Liquid Crystal (OI-AFLC) Display Mode Operating over a Wide Temperature Range using Ternary Bent-Core Liquid Crystal Mixtures. United States. doi:10.1002/open.201600138.
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, and Hegmann, Torsten. 2017. "An Optically Isotropic Antiferroelectric Liquid Crystal (OI-AFLC) Display Mode Operating over a Wide Temperature Range using Ternary Bent-Core Liquid Crystal Mixtures". United States. doi:10.1002/open.201600138.
@article{osti_1351644,
title = {An Optically Isotropic Antiferroelectric Liquid Crystal (OI-AFLC) Display Mode Operating over a Wide Temperature Range using Ternary Bent-Core Liquid Crystal Mixtures},
author = {Bergquist, Leah and Zhang, Cuiyu and Ribeiro de Almeida, Roberta R. and Pellegrene, Brittany and Salamonczyk, Miroslaw and Kim, Matthew and Hwang, Jung-Im and Kim, Kyeong-Jin and Lee, Joun-Ho and Jákli, Antal and Hegmann, Torsten},
abstractNote = {Here, 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 SmCaP A 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.},
doi = {10.1002/open.201600138},
journal = {ChemistryOpen},
number = 2,
volume = 6,
place = {United States},
year = {2017},
month = {2}
}