MulticolorLong-Persistent Luminescence with HighPhosphorescence Quantum Yield and Long Lifetime in Ultrahigh ElasticFibers

Organic long-persistent luminescence (LPL) materials have garnered significant attention for their applications in flexible displays, advanced anticounterfeiting, and various optical fields. However, achieving LPL in organic materials, particularly with high quantum yield and ultralong lifetime, still remains challenging. In this work, unconventional phosphor tetraacetylethylenediamine (TAED) and fluorescent dyes were incorporated into polyurethane fibers via wet spinning. The resulting fibers facilitated by hydrogen bonding networks and efficient phosphorescence resonance energy transfer (PRET) present a high phosphorescence quantum yield (PhQY) of 70.51%, a long phosphorescence lifetime exceeding 1 s, and a maximum Figure-of-Merit (FM) of 751 ms % at room temperature. Additionally, these LPL fibers exhibit excellent mechanical properties, including strong tensile strength and resistance to quenching effects from acid–base and heat environments. Even after 50 cycles of 500% stretching, the fibers retained their optical properties. Ultimately, the LPL fibers were successfully applied in flexible displays, advanced anticounterfeiting, and fashion design.