Perovskite-Based Nanostructures for Fluorescence Afterglow Anticounterfeiting
Ou Hai, Jian Li, Mengkang Pei, Qiang Ren, Xiulan Wu, Bin Qin, XinNan Xiao, Xiaoli He, Tong Li, Yang Chen
Abstract
Advanced fluorescence anti-counterfeiting technology has attracted the attention of researchers and encourages people to develop more materials with more colors and functions. Here, in order to achieve a full-band afterglow in the visible light region, we designed a composite CsPbI 3 -CsPbBr 3 /Sr 2 MgSi 2 O 7:Eu 2+,Dy 3+ @SiO 2, which is composed of nanoscale all-inorganic cesium lead perovskite quantum dots (PQDs) and long-afterglow luminescent materials Sr 2 MgSi 2 O 7:Eu 2+,Dy 3+ (SMS). SMS is used to store light energy, and PQDs are used to control afterglow emission colors; through their energy transfer, the afterglow colors can be adjusted in the visible region. SiO 2 is used as the coating material to improve the temporary stability of the nanocomposite. The composite mixed with oleic acid (OA) can be used as a dye, which exhibits different emitting colors and afterglow colors under different excitation environments. This research provided an idea for using long-afterglow luminescent materials and PQDs in the field of fluorescence anti-counterfeiting by double anti-counterfeiting of fluorescence and afterglow.