Effect of non-mesogenic chiral terphenylate on the formulation of room temperature ferroelectric liquid crystal mixtures suitable for display applications

Abstract

By varying the concentration of a chiral terphenylate dopant in a four-component achiral phenyl pyrimidine-based host mixture we have formulated six ferroelectric liquid crystal mixtures. Though the dopant is nonmesogenic it is observed that only 2wt% of it induces polarity in the host mixture at 32 o C. With increasing concentration, the mixtures show ferroelectric behaviour even below ambient temperature down to at least 12°C. Optical polarizing microscopy, differential scanning calorimetry, dielectric and electrooptic studies reveal that with respect to temperature range, phase sequence, spontaneous polarization, optical tilt angle and switching time the formulated mixtures are suitable for ferroelectric based liquid crystal displays.

Ferroelectric Liquid-Crystalline Binary Mixtures Based on Achiral and Chiral Trifluoromethylphenylterthiophenes

“…The maximum remnant polarization value (67 nC cm –2 ) was obtained for ( S )- 1b alone in the SmC* phase. Similar nonlinear increases in spontaneous polarization were observed in some FLC mixtures composed of achiral SmC liquid crystals as hosts and chiral dopants. − Spontaneous polarization and polarization power can be affected by the interaction through the interlayer space − as well as by the tilt angle fluctuation along with layer spacing fluctuation. , …”