Surficial Host‐Guest Responsive CsPbBr3 Perovskite Nanocrystals for Programmable Multi‐Level Information Encryption

Abstract

AbstractThe design of smart stimuli‐responsive photoluminescent materials capable of multi‐level encryption and complex information storage is highly sought after in the current information era. Here, a novel adamantyl‐capped CsPbBr3 (AD‐CsPbBr3) perovskite NCs, along with its supramolecular host‐guest assembly partner a modified β‐CD (mCD), mCD@AD‐CsPbBr3, are designed and prepared. By dispersing these two materials in different solvents, namely, AD‐CsPbBr3 in toluene, mCD@AD‐CsPbBr3 in toluene, and mCD@AD‐CsPbBr3 in methanol, the three solutions exhibit diverse photoluminescence (PL) turn‐on/off or PL discoloration response upon supramolecular stimulus. Based on these responses, a proof‐of‐principle programmable Multi‐Level Photoluminescence Encoding System (MPLES) is established. Three types of four‐level and three types of three‐level information encoding are achieved by the system. A layer‐by‐layer four‐level information encryption and decryption as well as a two‐level encrypted 3D code are successfully achieved.