Chiral, Thermally Irreversible and Quasi‐Stealth Photochromic Dopant to Control Selective Reflection Wavelength of Cholesteric Liquid Crystal

Abstract

The front cover artwork is provided by the group of Prof. Emeritus Yasushi Yokoyama and Prof. Takashi Ubukata. The image shows the generation of a colored image, whose origin is the UV‐controlled selective reflection of visible light from a cholesteric liquid crystal containing chiral photochromic molecules. Read the full text of the Article at 10.1002/cphc.202000309.

Light Intensity-Selective Photopolymerization and Photoisomerization for Creating Colorful Polymer-Stabilized Cholesteric Liquid Crystal Patterns

“…Photochromic CLC mixtures were prepared by adding these two compounds in LC polymers. In addition to photochromic copolymers containing photosensitive fragments (CC or NN bonds), Yokoyama and co-workers reported a photochromic fulgide derivative that possesses a ( R )-binaphthol moiety. The resulting photochromic CLC showed a structural color change between red and blue over time under 313 nm of light irradiation …”

“…The resulting photochromic CLC showed a structural color change between red and blue over time under 313 nm of light irradiation. 46 With the development of LC acrylates, varieties of PSCLC films have been prepared through photopolymerization. 47,48 However, in order to eliminate oxygen inhibition, 49 the films were usually prepared within cells or using an appropriate photoinitiator, which makes the fabrication process compli- cated.…”