Hand-Touch Thermoresponsive Dual-Fluorescent Smart Materials Obtained Through Reactive Crystallization

Smart organic fluorescent materials have garnered significant interest in optoelectronic and biomedical applications due to their unique optical properties in response to various stimuli. However, developing materials that exhibit high contrast and precise fluorescence changes in response to subtle external stimuli, while maintaining stability and reversibility, remains a significant challenge. Here, we report a revisable thermoresponsive dual fluorescence small organic molecular construct by reactive crystallization, capable of altering fluorescence colors from blue to yellow upon a mere hand touch. Additionally, code for pixel-by-pixel color extraction from digital images was developed to assist in color signal quantification, and established a first-order exponential growth relationship between temperature and the ratio of the fluorescence color changed to unchanged regions. Combined crystal data and theoretical analysis elucidated that solvent-induced reversible self-assembly was responsible for the thermosensitivity. This work opened a new avenue to develop next-generation smart temperature-sensitive materials.