A Mechanically Robust Large‐Area Afterglow Panel Exhibiting 25 s Ambient Phosphorescence Lifetime, Narrowband Emission, and Anti‐Fouling Property

Abstract High‐performance multifunctional afterglow panels are presented, featuring long afterglow duration, narrowband phosphorescence, large‐area processability, high mechanical strength, and anti‐fouling properties, achieved through a rational dopant‐matrix strategy using deuterated coronene (DCor) dopants with intrinsically small phosphorescence rate and polyamide 6 (PA6). Remarkably, the synergistic combination of DCor's long‐lived triplet states and PA6's oxygen‐blocking capability enables an exceptional luminescent performance, featuring 5‐min afterglow duration, 25 s phosphorescence lifetime, and a 23.47% photoluminescence efficiency—representing the longest‐lived room‐temperature phosphorescent material reported. Surprisingly, the panel exhibits narrowband phosphorescence—originates from an intensity‐borrowing vibronic coupling mechanism—with a full width at half maximum of merely 15 nm. Besides, the panels demonstrate a high tensile modulus of 578 ± 17 MPa. The excellent processability of PA6 allows scalable fabrication of these panels up to 2.27 × 1.30 m 2 . Furthermore, coating with a fluorinated hollow SiO 2 layer further imparts anti‐fouling and anti‐reflective properties. The durability and functionality of the panels are significantly enhanced beyond the capabilities of previously reported systems.