Constructing Polymer‐Based Long‐Lasting Phosphorescent Dual‐Pattern via Laser Marking for Anti‐Counterfeiting

In polymer‐based organic room‐temperature phosphorescence (RTP) systems for information encryption and anti‐counterfeiting, achieving multi‐image dynamic encryption within a single region while maintaining long‐lasting stability remains a significant challenge. Herein, a dual‐pattern dynamic encryption strategy is proposed by integrating angle‐dependent grating refraction of a lenticular lens array with laser‐programmable RTP afterglow modulation, enabling switchable image display within the same spatial domain. The material system is constructed from viologen‐derived luminophores copolymerized with acrylamide, followed by stepwise rigidification via cucurbit[7]uril host–guest complexation and subsequent formaldehyde cross‐linking. The VH series exhibits a phosphorescence lifetime of up to 2107.8 ms, whereas the VNH 2 series demonstrates both visible‐light‐excited emission and thermally activated delayed fluorescence. Spectroscopic analyses, including x‐ray photoelectron spectroscopy and Raman spectroscopy, reveal that pattern formation originates from laser‐induced chemical structural transformations. Precise matching of laser encoding with the lenticular lens array enables dynamic switching between two distinct afterglow patterns by varying the observation angle, thereby establishing a triple‐layer encryption mode integrating fluorescence concealment, phosphorescence activation, and angle‐resolved pattern transformation. Additionally, this study demonstrates large‐area patterning (10.2 × 10.2 cm 2 ) and scannable QR codes with durability exceeding two months, providing a scalable platform for advanced anti‐counterfeiting applications.