An Integrated Luminescent Information Encryption–Decryption and Anticounterfeiting Chip Based on Laser Induced Graphene

Abstract

Visual optical information encryption–decryption and anti-counterfeiting (IEDAC) technology play a vital role in the field of information security. Recent luminescent information encryption technologies face the disadvantages of depending on external large-scale stimulus decryption equipment, inability to read out repeatedly, and information leakage, impeding the practical applications of luminescence encryption. Here, an integrated luminescent IEDAC chip is proposed, which provides a convenient approach to store and decipher pre-patterned luminescence information based on laser engraved template and film heater. The luminescent encryption chip contains a double-layer structure made up of long persistent phosphors based on SrCaGa4O8 host and a laser induced graphene heater, which makes it possible to decrypt information on a single chip. This design enables dual-mode (photoluminescence/long persistent luminescence), dual-color (blue/yellow-green), and multi-level IEDAC function, providing a novel insight and integrated strategy for implementing advanced IEDAC technologies.