Colorful Persistent Luminescence Induced by Inorganic‐Polymer Hybridization

PET is a low‐cost engineering polymer with excellent mechanical properties, making it widely applicable in daily life. However, these conventional polymers usually struggle to satisfy the advanced modern requirements. Here, PET is endowed with a shining dominant afterglow with an inorganic‐polymer hybridization strategy. This hybrid is facilely prepared by thermal treatment of PET with metaboric acid (MBA) on a kilogram scale, and applicable to other aliph‐aromatic polyesters such as poly(butylene terephthalate), poly(ethylene furan‐dicarboxylate), and poly(ethylene 2,6‐naphthalate) and etc. Furthermore, the afterglow emission is successfully modulated across a broad spectral range (blue to red) via a Förster resonance energy transfer (FRET) mechanism, which is achieved by doping widely utilized fluorophores to PET@MBA hybrids as acceptors. These hybrids exhibit processing versatility, being workable to either molding or solution techniques, thus allowing the establishment of high‐level dynamic encryption by the magic cube. It is believed that the results will make more scientists pay attention to fabricating inorganic‐polymer composites as functional materials via simple physical modifications.