Introducing lanthanide metal–organic framework and perovskite onto pulp fibers for fluorescent anti-counterfeiting and encryption

• Published in: Cellulose (London) Vol. 29; no. 2; pp. 1115 - 1127
• Main Authors: Wang, Haiping, Qian, Xueren, An, Xianhui
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.01.2022; Springer Nature B.V
• Subjects: ambient temperature; Bioorganic Chemistry; cellulose; Ceramics; Chemistry; Chemistry and Materials Science; Composites; coordination polymers; Counterfeiting; Crystal structure; Excitation; Fluorescence; Glass; Handwriting; lanthanides; Lead; lead nitrate; Metal-organic frameworks; Natural Materials; Organic Chemistry; Original Research; Perovskites; Physical Chemistry; Polymer Sciences; Reaction time; Room temperature; Sustainable Development; Pulp fibers; Fluorescence; Perovskite; Anti-counterfeiting; Metal–organic frameworks
• ISSN: 0969-0239; 1572-882X
• DOI: 10.1007/s10570-021-04331-6

The research of anti-counterfeiting and encryption has always been a subject of universal concern all over the world. Herein, lanthanide metal–organic framework (Eu-MOF) and CH 3 NH 3 PbBr 3 (MAPbBr 3 ) perovskite were introduced onto pulp fibers (PFs) to prepare fluorescent anti-counterfeiting and encryption papers. Eu-MOF@PFs paper emitted red fluorescence at 254 nm UV excitation. The optimum preparation conditions of Eu-MOF@PFs were 2.5 mmol of Eu(NO 3 ) 3 , 4 h of reaction time and room temperature. When MABr ink was written on Pb/Eu-MOF@PFs paper, the green fluorescent handwriting and red fluorescent paper were observed under 365 nm and 254 nm UV excitation, respectively. The appropriate addition amount of lead nitrate was 0.6 mmol. Pb/Eu-MOF@PFs paper was immersed in MABr solution to prepare MAPbBr 3 @Pb/Eu-MOF@PFs paper. Under 254 nm and 365 nm UV irradiations, MAPbBr 3 @Pb/Eu-MOF@PFs paper emitted red-green double fluorescence and the quantum yields of which were 3.11% and 2.48%, respectively. The crystal structure of MAPbBr 3 was easily destroyed by polar solution, which realized on/off switching of the luminescence signal for multistage information encryption. The above paper-based fluorescence materials were potential for advanced anti-counterfeiting and encryption applications.