Near‐Infrared Luminescent Imaging‐Based 3D QR Cube Platform for Spatial Information Storage and Security (Adv. Mater. 6/2025)

3D QR Cube Platform In article number 2416121, Sohyung Kim, Jiheon Lim, and co-workers present a 3D quick response (QR) cube platform that utilizes near-infrared (NIR)-to-NIR upconversion nanoparticles for spatial information storage and security. By employing volumetric space and a convolutional neural network, the platform precisely reconstructs the 3D QR cube and achieves high prediction accuracy. Leveraging the cube's 3D spatial design, it offers advanced encryption capabilities far beyond traditional 2D codes, presenting new possibilities for secure and robust multi-level encryption in 3D space.