Surficial Host‐Guest Responsive CsPbBr<sub>3</sub> Perovskite Nanocrystals for Programmable Multi‐Level Information Encryption
Bo‐Yi Deng, Zi‐Rong Zhou, Hailong Xu, Zi‐Hao Liao, Chen‐Ho Tung, Li‐Zhu Wu, Feng Wang
Abstract
Abstract The 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 CsPbBr 3 ( AD‐CsPbBr 3 ) perovskite NCs, along with its supramolecular host‐guest assembly partner a modified β‐CD ( m CD ), m CD@AD‐CsPbBr 3 , are designed and prepared. By dispersing these two materials in different solvents, namely, AD‐CsPbBr 3 in toluene, m CD@AD‐CsPbBr 3 in toluene, and m CD@AD‐CsPbBr 3 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.