DERIVATIVES OF 4-AMINO-N-ETHYLNAPHTHALIMIDE FOR USE IN NEMATIC LIQUID-CRYSTALS

The order parameters of some dichroic fluorescent dyes {derivatives of 4-amino-N-ethylnaphthalimide} in three nematic liquid crystal mixture s (W52, E7 and ZLI 2359) have been determined by means of optical spec troscopy methods and the influence of the dye addition on the nematic- isotropic phase transition temperature has also been investigated. The voltages characterizing the impact of the electric field on the dye-l iquid crystal mixtures have been estimated. It was found that the dyes can be utilized in guest-host liquid crystal display devices.