Stretchable Polymer Films Doped with Dual‐Emissive Luminogens: Dynamic Afterglow, Strain Detection, and Advanced Anti‐Counterfeiting

Abstract Stress–strain responsiveness and visualization materials have considerable potential for information encryption, environmental sensing, and flexible optoelectronics. However, there still remain challenges in molecular design and understanding the intrinsic mechanism. Herein, two novel luminogens are designed and synthesized. They simultaneously exhibited TADF and RTP emissions in plastic polyvinyl chloride (PVC) and elastic styrene‐isoprene‐styrene block copolymer (SIS) doping matrices, accompanied by time‐dependent afterglow from blue to green. The high‐contrast stretchable and stress–strain responsiveness and visualization behaviors are achieved for the two luminogens in PVC and SIS matrices. Noteworthy, 1% AN‐CN@PVC and 1% AN‐NH 2 @PVC films showed continuously decreasing RTP intensity and lifetime, as well as increased RTP‐to‐TADF intensity ratio with the increase of elongation, with the lowest strain detection limits of 13.19% and 5.84% in turn. This work not only obtained new long‐lived TADF and RTP materials, achieved multi‐color dynamic afterglow, strain detection and visualization, advanced anti‐counterfeiting, and high‐contrast stretchable behaviors, but also can be expected to provide more inspirations and possibilities for using TADF and RTP materials in a more cutting‐edge field, as well as theoretical guidance and experimental supports for further molecular designs.