Fig. 1: Design of geminate labels programmed by two-tone microdroplets.
From: Geminate labels programmed by two-tone microdroplets combining structural and fluorescent color
a Schematic illustration to show the design of a geminate label created by using two-tone inks and photographs of the resulting label (47 mm × 17 mm) in reflective and fluorescent states. The label carrying two distinct kinds of information demonstrates a reflective pattern of RGB “FDU” under white light and a fluorescent pattern of cyan “I love U” upon UV irradiation. The blue, green, red, and pale-yellow colors of the blocks represent the reflection colors of the microdroplets and letter “F” represents the microdroplets with fluorescence. b Schematic illustration to show fluorescent cholesteric liquid crystal (FCLC) microdroplets (two-tone inks) combining structural color under white light and fluorescent color upon UV irradiation. c Chemical structures of the materials used to prepare the FCLC mixtures, including fluorescent molecule DC5, (S)-binaphthyl derivative chiral dopant and LC host E7.
