Photoresponsive behavior of the liquid crystals containingred and orange fluorescent dyes

Abstract

Liquid-crystalline (LC) system doped with dye molecules exhibits significantly enhancedphotoinduced reorientation behavior compared to undoped LC system. Recently, we reported thatgreen fluorescent coumarin dyes act as triggers for photoinduced reorientation of nematic LCs toreduce photothermal effect during photo irradiation at high-light intensity. In this study we exploredphoto responsive behavior of nematic LCs containing orange and red-fluorescent dyes to createphoto alignment systems with sensitivity in the long-wavelength region.