Dual-Mode Luminous Lead-Free Cs3Cu2Cl5 Perovskite Embedded in UiO-66-NDC Nanoparticles for Multilevel Anti-Counterfeiting

Optical anti-counterfeiting technology has been considerablydevelopingin the field of information security and confidentiality. Hence, thegrowing demand for optical anti-counterfeiting technology requireseco-friendly and stable materials with multimodal fluorescence toimprove the difficulties in information decryption. Herein, a dual-mode-emissionCs(3)Cu(2)Cl(5)/UiO-66-NDC (CCL/UiO) nanocompositehas been fabricated by growing lead-free Cs3Cu2Cl5 nanocrystals (5-7 nm) in the pores (5-8nm) of UiO-66-NDC (1,4-naphthalene-dicarboxylic acid) via a nanoconfinementstrategy. The as-obtained nanocomposite exhibited distinctly luminousgreen (530 nm) and blue (418 nm) colors from the emission of Cs3Cu2Cl5 and UiO-66-NDC under 254 and365 nm excitation, respectively, implying that the nanocompositesdisplayed excitation-wavelength-dependent emission. We evaluatedthe possibility of associating the as-achieved CCL/UiO ink with otherdevices, such as printer and pen, to improve the efficiency of anti-counterfeitingpattern preparation. Moreover, a multilayered anti-counterfeitingstructure was constructed by combining CCL/UiO and UiO-66-NDC layersto improve the difficulties of information decipherment. This workprovides a valuable research inspiration for the design and preparationof multimodal anti-counterfeiting materials.