ORGS1-0348
Time-Domain Multi-color Optical Encryption Using Photopatterned Photochromic Polymer Matrices
Topic
GS1. Graduate Student Oral Session I: Colloidal and Interfacial Polymer Science
When and Where
Sep 28, 2026
14:48 - 15:00
Room 101
Session Chairs
Yoon-Ho HWANG
Jang-Hwan KIM
Hyosung AN
Presenter(s)
Hyun Joon Chun (POSTECH)
Co-Author(s)
Abstract
Photochromic optical encryption enables visual authentication through light-induced color changes but existing systems often suffer from limited color diversity, transient storage, and restricted matrix level patterning. Here, we present photopatterned photochromic polymer matrices for multi-color and time-domain optical encryption. Spiropyran, spirooxazine, and naphthopyran derivatives are embedded in a 1,6-hexanediol diacrylate (HDDA)-based matrix to form patterns with distinct colors and fading kinetics. Spectral additivity enables subtractive color mixing, while dye dependent fading time allows subsequent decoding in 7-segment digit displays. Photoluminescence provides an orthogonal cue for dual-lock encryption. A slippery transparent cover layer suppresses water droplet-induced distortion, enabling QR code authentication within a time window. This platform offers a practical route to durable, multi-color, and time-gated optical security labels.
