実験および理論に立脚した刺激応答型発光性液体材料の合成と刺激応答挙動の解明

抄録

In the recent two decades, stimuli-responsive photoluminescent (PL) solid materials have attracted much attention because their materials can dramatically change luminescent colors in response to external stimuli. However, applications used by organic solid materials are limited to luminescent colors only. Designs and fabrications of materials outputting changes in physical properties other than PL properties can expand application scenes and options as well as create novel material designs instead of solid materials. In this article, we describe developments of stimuli-responsive photoluminescent liquid materials by a synergy between experimental and theoretical investigations. Room-temperature liquid material is promising as an organic solvent free material with a low environmental load. Moreover, a fluidic property of liquid can retain the high-process reproducibility of coating film without formations of defects and grain boundaries by anyone, anytime, and anywhere. In this article, material designs of stimuli-responsive PL liquids are very easy, of which liquids can show dramatic changes in multiple physical properties by a single stimulus only, as not observed for solid materials. Stimuli-responsive PL liquids can show liquid-solid (disorder-order) phase transition in response to external stimuli at a micro-scale level. The elucidation of these behaviors can be predicted by experimental methods, but only speculation. Theoretical methods have helped us out of five miles in the fog, which can elucidate this stimuli-responsive behavior at a molecular level. These results are almost consistent with those predicted by experimental ones and disorder-order phase transition can be clearly elucidated over multiscale. Moreover, novel stimuli-responsive liquids designed based on theoretical results can show desired functions in experiments. These results prove the synergy between experimental and theoretical methods opens a new strategy to develop stimuli-responsive liquid materials with desired functionalities.