Ferroelectric Liquid Crystals for Nonlinear Optics:  Orientation of the Disperse Red 1 Chromophore along the Ferroelectric Liquid Crystal Polar Axis

Antiferroelectric Liquid Crystal from Bent-Core Molecule with Vinyl End Group

“…[1][2][3] Ferroelectric liquids (FLCs) due to the spontaneous polarization are now regarded as one of the most promising property of optoelectronic materials. 4,5 A fascinating example of the achiral symmetry breaking was found in the tilted smectic phases of banana-shaped molecules. 6,7 Because of the director tilt and the simultaneous polar ordering, each smectic layer loses its inversion symmetry and becomes chiral, although the molecules contain no chiral carbons.…”

“…Currently, ferroelecric liquid crystals that exhibit spontaneous polarization due to their self-organizing character are regarded as one of the most promising groups of optoelectronic materials. 5 In this study, new banana-shaped achiral molecules having vinyl end groups were synthesized, and their antiferroelectric liquid crystalline properties were investigated to determine the relationship between the liquid crystallinity and the structure of the vinyl groups. In our previous work, we obtained ferroelectric phase by controlling the number of carbon atom in alkenyloxy chain 13 and introducing a polar lateral substituent in the 3-position of Schiff's base moiety of a bent-core molecule.…”

Novel Cross-linked Organic Materials with Pronounced Spontaneous Polarization Based on Bis-Dipolar Molecules

“…FLCs that exhibit P s due to their selforganizing character have been regarded as one of the most promising groups of optoelectronic materials. [2,3] However, FLCs suffer from poor resistance to thermal and mechanical shocks. The thermal and mechanical stability of polar FLC materials could be improved by the process of polymerization that introduces cross-linking.…”

“…[1] In solution these materials were known to be highly luminescent, and lasing action in solution was reported. [2] In 1996 claims of photo-pumped lasing [3] in conjugated polymer films were the first of a large number of publications on laser action in conjugated polymer films. A very interesting possibility is the realization of an electrically pumped organic laser since these materials have high yields of electroluminescence (EL).…”

“…Two important issues that have been addressed and improved are the polymer synthesis and material preparation. Lasing has now been observed in films of most of the polymer systems used today such as poly(p-phenylenevinylene) (PPV), [3] ladder-poly(p-phenylene) (LPPP), [4] polyfluorene (PF), [5,6] polythiophene (PT) [7] and disubstituted polyacetylene (PA). [8] The processability of these materials due to the flexible nature of the polymer has been used to obtain lasing in a number of geometries, e.g., flexible, tunable distributed feedback (DBF) lasers, [9] micro-ring lasers and micro-disc lasers.…”