Excitation-wavelength-dependent fluorescent organohydrogel for dynamic information anti-counterfeiting  

作　　者：Dong Guo Xiaoxia Le Hui Shang Fuqing Shan Danyang Li Chunfa Ouyang Tao Chen 

机构地区：[1]School of Materials Science and Engineering,Shanghai Institute of Technology,Shanghai 201499,China [2]Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China [3]School of Chemical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Chemical Letters》2023年第11期180-183,共4页中国化学快报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2022YFB3204300);the National Natural Science Foundation of China(No.52103246);Zhejiang Provincial Natural Science Foundation,China(No.LQ22E030015);Natural Science Foundation of Ningbo,China(No.20221JCGY010301).

摘　　要：Anti-counterfeiting labels with various fluorescent colors are of great importance in information encryption-decryption,but are still limited to static information display.Therefore,it is urgent to develop new materials and encryption-decryption logic for improving the security level of secret information.In this study,an organohydrogel made up of poly(N,N-dimethylacrylamide)(pDMA)hydrogel network and polyoctadecyl methacrylate(pSMA)organogel network that copolymerized with two fluorophores,6-acrylamidopicolinic acid moieties(6APA,fluorescent ligand)and spiropyran units(SPMA,photochromic monomer),was prepared by a two-step interpenetrating method.As UV light of 365nm and 254nm can both cleave C_(spiro)-O bonds of SPMA,and the green fluorescence of 6APA-Tb^(3+) can only be excited by 254nm light,the organohydrogel displays yellow and red under the irradiation of 254nm and 365 nm,respectively.In addition to wavelength selectivity,these two fluorophores are thermal-responsive,leading to the fluorescence variation of the organohydrogel during heating process.As a result,secret information loaded on the organohydrogel can be decrypted by the irradiation of UV light,and the authenticity of the information can be further identified by thermal stimulation.Our fluorescent organohydrogel can act as an effective anti-counterfeiting label to improve the information security and protect the information from being cracked.

关 键 词：Fluorescent organohydrogel ANTI-COUNTERFEITING Stimulus responsive Encryption-decryption Dynamic fluorescence 

分 类 号：O62[理学—有机化学]