“…By exploiting heat/light-induced aggregation, microscopic control of the structure and remote control of the macroscopic luminescence behavior of the material have been realized. Thermochromic/photochromic functional materials exhibit dynamic multicolor fluorescence changes under heat/light stimulation. − Compared with other stimulus-response materials, they have the advantage of contact-less control, − which endows them with great potential applications in the fields of optical response materials, − hologram photography, − encryption, and anticounterfeiting. − There have been some studies on thermo-photoluminescent oligo/polyurethanes, but most of them are composites, such as doping with metal ions, SiO 2 , or rare-earth luminous complexes. − There are also several pure polyurethanes with thermal/photochromic properties obtained by covalent linking or simply doping with monomers that can undergo isomerization. − However, such systems are often plagued by aggregation-caused quenching (ACQ) effects. For example, after gelation, the dense three-dimensional network would impose significant steric hindrance, which makes it challenging to isomerize the chromophores .…”