| abstract |
There is a need for a liquid crystal medium having stability against heat, light, etc., a wide liquid crystal phase temperature range, and a very large dielectric anisotropy and expressing an optically isotropic liquid crystal phase. There is also a need for various optical devices that can be used over a wide temperature range, have short response times, high contrast ratios, and low drive voltages. An achiral component T containing at least one compound selected from the group of compounds represented by formula (1) and at least one compound selected from the group of compounds represented by formula (2) and a chiral agent And a liquid crystal composition containing an optically isotropic liquid crystal phase. In Formula (1) and Formula (2), R 1 and R 2 are independently, for example, alkoxyalkyl; Z 11 , Z 12 , Z 21 and Z 22 are independently, for example, a single bond L 11 to L 13 , L 21 and L 22 are independently, for example, fluorine; Y 1 and Y 2 are independently, for example fluorine. |