To further evaluate the potential of our system for high-volume information encryption or even data storage, we 3D-printed square array molds to create a 21×21-pixel QR code encryption template. As shown in Figure , in this non-optimized example, the code is almost invisible after the painting, but can be easily deciphered following UV exposure. Thanks to the extensive color tunability of the NDI polymer platform, various color combinations can be applied to the encryption process (e.g., white-to-blue emission transition, Figure ). Based on this universal TSCT polymer platform, additional potential applications can be explored by selecting different stimuliresponsive moieties.