Journal of Materials Chemistry · 2011 · 23 citations · 33 references
Optical MaterialsEngineeringOrganic ElectronicsCubic BpOptoelectronic DevicesChemistryElectronic DevicesOptical PropertiesPhase SeparationCubic Blue PhasePhysicsPhotonic MaterialsOptoelectronic MaterialsPhase Transition BehaviourElectronic MaterialsPhase EquilibriumNatural SciencesBlue PhasesApplied PhysicsMolecular SwitchFunctional Materials
After preparing a biphenyl derivative possessing two 2,3-difluoro-1,4-diphenylbenzene units, we investigated its phase transition behaviour. It showed a phase sequence of isotropic liquid–nematic phase–anticlinic smectic C phase. A mixture with a chiral additive with a high twisting power exhibited a cubic blue phase and/or an amorphous blue phase III (BPIII). The compound doped with 10 wt% of the chiral additive showed a phase sequence of Iso 85.4 °C BPIII 70.6 °C cubic BP 47.3 °C chiral nematic 37.3 °C unidentified smectic phase. We investigated electro-optical switching in BPIII and in the cubic BP of the mixture. Transmittance without an applied electric field in the BPIII was 0%, whereas that in the cubic BP was 4.6%. Threshold and driving voltages in the BPIII are lower than in the cubic BP. Furthermore, the BPIII exhibits no voltage-induced hysteresis effects on transmittance. Amorphous BPIII has superior potential for use in next-generation displays.
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Polymer-stabilized liquid crystal blue phases
Hirotsugu Kikuchi, Masayuki Yokota, Yoshiaki Hisakado et al. · Nature Materials · 2002 · 1.3K citations
Thermodynamic, structural and morphological studies on liquid-crystalline blue phases
H. Stegemeyer, Th. Blümel, K. Hiltrop et al. · Liquid Crystals · 1986 · 238 citations