| 초록 |
A photochromic LC dopant (abbreviated as AZCD) was designed and synthesized for the fabrication of remote-controllable and optically tunable thin films. AZCD is composed of an azobenzene LC mesogen and a chiral isosorbide core. Thermal, microscopic and diffraction analyses were conducted to investigate the mesomorphic properties and structural change of ordered states. As the temperature changes, AZCD exhibits two smectic crystalline phases and one liquid crystalline phase. Blue phase (BP) and chiral nematic phase (N*) can be formed by doping the AZCD into the nematic LC medium. In the N* film, the reflection color is changed reversibly by trans-cis isomerization of azobenzene moiety. On the same principle, BP changes reversibly with the isotropic phase by UV and visible light. AZCD doped photo-responsive film could be utilized as optically tunable thin films. This work was supported by BK 21 FOUR Program and Mid-Career Researcher Program (2021R1A2C2009423). |
