Multi‐Mode Elastic Full‐Color Fluorescent Patterns for Multi‐Visual Encryption

The development of multi‐mode fluorescent patterns has attracted widespread attention, particularly for applications in high‐density information storage and highly secure encryption. However, the fabrication process of multi‐mode fluorescent patterns generally involves tedious and expensive steps. Specifically, in the fabrication technology of elastic full‐color fluorescent patterns, there is still a lack of ideal patterning preparation technology that can overcome the solvent orthogonality problem associated with multi‐color fabrication while ensuring both high elasticity and luminescence efficiency of the pattern. Herein, the multi‐mode elastic fluorescent patterns are successfully fabricated by multiple transferring of the quantum dots (QDs) from the carrier substrates to the elastomeric PDMS substrate via femtosecond laser‐induced forward transfer (FsLIFT) technology. Due to its solvent‐free nature, absence of masking requirements, and no need for annealing during FsLIFT processing, the multiple transferred QD films achieve independent patterns and does not interfere with each other, providing a strong promise for the fabrication of multi‐mode elastic full‐color patterns. Based on these stretchable fluorescent patterns, multi‐visual encryption techniques are successfully demonstrated. The proposed FsLIFT technology offers an efficient and straightforward strategy for fabricating multi‐mode fluorescent patterns with potential applications in advanced commercial security information encryption and dynamic camouflage.