Ester group containing 1,8-naphthalimide fluorescent dichroic dye, its preparation method and application thereof

Abstract

Disclosed are an ester group containing 1,8-naphthalimide fluorescent dichroic dye, its preparation method and an application thereof. The dye has a structure of a general formula X, in which R is p-1-20 carbon linear alkyl, p-1-20 carbon linear alkoxy, monosubstituted fluorine, polysubstituted fluorine or hydrogen. According to the invention, with 1,8-anhydride naphthalene used as a matrix, the dye molecules have high dichroic ratio and good dissolvability in a liquid crystal through introduction. Guest-host liquid crystal display products with the dye used as a guest body not only have characteristics of a traditional guest-host display such as highlight brightness, high contrast ratio and low energy consumption, but also have characteristics of an active display mode, such as bright color and high brightness. The guest-host liquid crystal display products are liquid crystal display products which have much lower energy consumption and have practical values.

Description

technical field The invention relates to a preparation method and application of a class of ester group-containing 1,8-naphthoimide fluorescent dichroic dyes in the field of liquid crystal displays. Background technique The "guest-host" type liquid crystal display dissolves dichroic dyes in the host liquid crystal of the nematic phase, and the long rod-shaped dye molecules similar to the structure of the host liquid crystal will align with the orderly arrangement of the liquid crystal. Under the action of an external electric field, the liquid crystal molecules are rearranged, resulting in a change in the arrangement of the dye molecules, which leads to a change in the absorption spectrum of the dye. Therefore, the brightness of the display can vary with the applied voltage. If the dichroic dyes used in the "guest-host" display can emit fluorescence, not only the absorption intensity can be changed, but also the fluorescence intensity can be controlled with the applied volt...

AI Technical Summary

Problems solved by technology

Few of the reported fluorescent dichroic dyes can really achieve practical value.