Affiliation:
1. Department of Polymer‐Nano Science and Technology Department of Nano Convergence Engineering Jeonbuk National University Jeonju 54896 Republic of Korea
2. Department of Flexible and Printable Electronics and LANL‐JBNU Engineering Institute‐Korea Jeonbuk National University Jeonju 54896 Republic of Korea
3. Materials Department University of California Santa Barbara CA 93106 USA
Abstract
AbstractTo develop advanced optical systems, many scientists have endeavored to create smart optical materials which can tune their photophysical properties by changing molecular states. However, optical multi‐states are obtained usually by mixing many dyes or stacking multi‐layered structures. Here, multiple molecular states are tried to be generated with a single dye. In order to achieve the goal, a diacetylene‐functionalized cyanostilbene luminogen (DACSM) is newly synthesized by covalently connecting diacetylene and cyanostilbene molecular functions. Photochemical reaction of cyanostilbene and topochemical polymerization of diacetylene can change the molecular state of DACSM. By thermal stimulations and the photochemical reaction, the conformation of polymerized DACSM is further tuned. The synergetic molecular cooperation of cyanostilbene and diacetylene generates multiple molecular states of DACSM. Utilizing the optical multi‐states achieved from the newly developed DACSM, switchable optical patterns and smart secret codes are successfully demonstrated.