用于可扩展和高分辨率隐形印刷的磷光碳纳米点油墨OA

Phosphorescent inks based on carbon nanodots(CNDs)offer an environmentally friendly and low-cost alternative for persistent visibility and time-delayed information retrieval.However,current matrix-dependent phosphorescent CNDs suffer from poor processability and limited substrate compatibility,hindering their application in scalable,high-resolution invisible printing.Here,we report water-soluble phosphorescent CND inks that enable high-resolution,environmentally stable,and invisible printing.The triplet excitons in CNDs are stabilized by spatial confinement during printing,resulting in bright and long-lived phosphorescence.The phosphorescent CND inks enable invisible yet high-fidelity printing of complex textual patterns with micrometer resolution(2480×3508 dpi,～100 μm feature size),supporting font sizes down to 5 pt and line widths as thin as 0.05 pt across five types of paper substrates.The printed patterns exhibit over 98.7%accuracy across approximately 8.7 million pixels,demonstrating excellent fidelity.Based on these excellent invisible printing properties,a 200-page wordless book using phosphorescent CND inks was demonstrated.This work presents a scalable,low-cost,and high-resolution platform for phosphorescent ink printing,marking a significant advance in invisible printing technology.