Ultralong‐Lived and Color‐Tunable RTP in Biodegradable Natural Fibers Based Textiles for Wearable Security and Display

Abstract Room‐temperature phosphorescent (RTP) materials have great prospects in the next‐generation optoelectronic applications. However, developing safe, color‐adjustable, ultra‐long‐lasting and eco‐friendly RTP materials remains challenging. In this study, natural collagen (Col) and polyvinyl alcohol (PVA) were co‐integrated through wet spinning technology, combined with aromatic amine phosphors, to construct biodegradable RTP fibers (Col/PVA/T, Col/PVA/B, Col/PVA/A). Through the hydrogen bond network between polymers and phosphorescent molecules, combined with the self‐reinforcing rigid structure of the mixed matrix, Col/PVA/T fibers are endowed with outstanding RTP properties: phosphorescent lifetime up to 1.89 seconds, afterglow duration exceeding 14 seconds. The modular design strategy achieves adjustable multi‐color emission (green/blue/yellow) by selecting phosphors. As inherently biocompatible and biodegradable materials, these fibers possess outstanding mechanical flexibility and textile compatibility, enabling the production of smart fabrics with excellent moisture permeability (1902 g m ⁻² 24 h ⁻¹ ) and air permeability (368 mL cm ⁻² h ⁻¹ ). This research further demonstrates their transformative potential in anti‐counterfeiting systems with time‐resolved encryption capabilities and dynamic wearable displays. This work not only sets a new paradigm for eco‐friendly luminescent textiles, but also Bridges the gap between sustainable materials and advanced photonic applications in personal safety and human‐machine interfaces.