Liquid crystalline amorphous blue phase and its large electrooptical Kerr effect

  title={Liquid crystalline amorphous blue phase and its large electrooptical Kerr effect},
  author={Khoa V. Le and Satoshi Aya and Yuji Sasaki and Hyunhee Choi and Fumito Araoka and Kenji Ema and J{\'o}zef Mieczkowski and Antal J{\'a}kli and Ken Ishikawa and Hideo Takezoe},
  journal={Journal of Materials Chemistry},
  • K. Le, S. Aya, H. Takezoe
  • Published 14 February 2011
  • Physics, Materials Science
  • Journal of Materials Chemistry
An amorphous blue phase III with low and wide thermal range (∼20 °C) including room temperature is induced by doping a bent-core nematic with a strong chiral material. We confirm that the electrooptical response is due to the Kerr effect, with the Kerr constant being up to two orders of magnitude larger than conventional Kerr materials such as nitrobenzene. 
Amorphous Blue Phase III Exhibiting Submillisecond Response and Hysteresis-Free Switching at Room Temperature
We prepared a host liquid crystal consisting of a practical nematic liquid crystal mixture and a small amount of a newly designed T-shaped compound. The host liquid crystal doped with a chiral dopant
Blue Phase III—Isotropic Phase Transition in a Bent-Core Liquid Crystal with Chiral Dopant
Calorimetric measurements and optical observations have been performed to investigate the effect of chirality on a bent-core nematic (BCN) material which can exhibit an amorphous blue phase (BPIII)
Liquid-crystalline blue phase II system comprising a bent-core molecule with a wide stable temperature range.
EO observations show that the BPII produced exhibited stable EO performance based on the EO Kerr effect, and this material demonstrated very fast, sub-millisecond-scale, response times, thus showing potential for use in high-speed EO devices.
Fast tunable reflection in amorphous blue phase III liquid crystal
The dynamic reflection spectra of amorphous blue phase III were investigated. When an electric field is applied to a blue phase III cell, the reflected wavelength does not shift obviously, but the
Unusual Electro-Optic Kerr Response in a Self-Stabilized Amorphous Blue Phase with Nanoscale Smectic Clusters.
  • K. Le, M. Hafuri, F. Araoka
  • Physics
    Chemphyschem : a European journal of chemical physics and physical chemistry
  • 2016
The electro-optic response in the "foggy" amorphous blue phase (BPIII) as well as in the isotropic phase is investigated and the Kerr constant was measured and found to be ∼500 pm V(-2) , which is the largest among bent-core BP systems reported so far and comparable with that of polymer-stabilized BPs.
Stable electro-optic response in wide-temperature blue phases realized in chiral asymmetric bent dimers [Invited]
We report that an asymmetric bent dimer, consisting of a rod mesogen and a cholesterol mesogen linked by a flexible spacer with 9 carbon atoms, was found to form blue phases with a record-wide
Unusual electro-optical behavior in a wide-temperature BPIII cell.
Because the phase transition from BPIII to chiral nematic phase does not happen, the device shows no hysteresis effect and no residual birefringence, exhibits fast response, and can be a candidate for fast photonic application.
Blue Phase: Shining Star of Liquid Crystals
In this study, general information about the physical properties, photonics and optical applications of the blue phase liquid crystals is given. The blue phase is a liquid crystal phase between the
Low voltage and hysteresis-free blue phase liquid crystal dispersed by ferroelectric nanoparticles
Electro-optical switching with low voltage, free hysteresis and fast response speed is achieved in a facile manner by dispersing a small amount of ferroelectric nanoparticles (NPs) into blue phase
Polymer-stabilized nanoparticle-enriched blue phase liquid crystals
Electro-optical switching with low voltage, no hysteresis and fast response speed is achieved in polymer-stabilized nanoparticle-enriched blue phase liquid crystals with a wide temperature range, and


Stable Amorphous Blue Phase of Bent-Core Nematic Liquid Crystals Doped with a Chiral Material
We report an induction of the blue phase III (BPIII) at a relatively low and wide (over 20 °C) temperature range in nematogenic achiral bent-core liquid crystals doped with a high twisting power
Nanoparticle-induced widening of the temperature range of liquid-crystalline blue phases.
Systematic high-resolution calorimetric studies reveal thatblue phase III is effectively stabilized in a wide temperature range by mixing surface-functionalized nanoparticles with chiral liquid crystals, yielding a robust method to stabilize blue phases, especially blue phase III.
Liquid Crystalline Blue Phases
Blue phases are known to appear in chiral liquid crystals in a small temperature range between the chiral nematic phase and the isotropic one. They are optically active, non-birefringent, and they
Blue Phase, Smectic Fluids, and Unprecedented Sequences in Liquid Crystal Dimers
Several optically pure liquid crystal dimers with strong molecular chirality, synthesized by covalently linking an achiral bent-core unit with a bulky pro-mesogenic rodlike chiral entity through a
Low voltage blue-phase liquid crystal displays
A protrusion electrode structure is proposed to dramatically lower the operation voltage of the emerging blue-phase liquid crystal displays (BP-LCDs). Simulation results indicate that the generated
A blue phase observed for a novel chiral compound possessing molecular biaxiality
The T- shaped chiral compound was found to show a blue phase with a wide temperature range on cooling and a double twist structure formed by the T-shaped compound can stabilize the blue phase.
Short-Range Smectic Order in Bent-Core Nematic Liquid Crystals
Small angle X-ray diffraction from the uniaxial nematic phase of certain bent-core liquid crystals is shown to be consistent with the presence of molecular clusters possessing short-range tilted
Liquid crystal ‘blue phases’ with a wide temperature range
It is proposed that the unusual behaviour of these blue phase materials is due to their dimeric molecular structure and their very high flexoelectric coefficients, which sets out new theoretical challenges and potentially opens up new photonic applications.
Large flow birefringence of nematogenic bent-core liquid crystals.
It is proposed that this large enhancement for bent-core compounds may be attributed to nanoscale smecticlike clusters that persist above the nematic-isotropic transition temperature, and shear align under shear flow; however, this mechanism has not yet been definitively confirmed.
Chirality in liquid crystals
Chirality has become arguably the most important and complex topic of research in liquid crystals today. The reduced symmetry in these organized phases leads to a variety of novel phase structures,