光诱导CsPbBr3纳米晶物理不可克隆荧光防伪膜的制备及其应用

Abstract This work developed a novel PUF fluorescent anti-counterfeiting strategy by using hexabromocyclododecane (HBCD) as the bromine source precursor.Under UVC ultraviolet lamp stimulation HBCD undergoes bond cleavage and dehalogenation to release Br ions driving the in-situ formation of CsPbBr 3 perovskite nanocrystals.In this anti-counter feiting system polymer cavities generated via PS/PEG phase separation serve as the microscopic cryptographic keys within the PUF fluorescent label while KSiF Mn (KSF) phosphor act as positional references within the cavities.This design enables an organic integration of macroscopic patterns with microstructural features (1) macroscopically the label remains invisible under daylight yet exhibits a distinct green fluorescent pattern under 365 nm UV excitation (2) micro scopically the PUF key-comprising randomly distributed polymer pores and uniquely positioned KSF crystals-can be directly observed using smart electronic devices equipped with portable macro lenses.The stochastic microstructure formed by the incompatibility-driven phase separation between PS and PEG imparts an exceptionally high level of security to the label effectively addressing the vulnerability of conventional static fluorescent anti-counterfeiting tags to counterfeiting.Keywords CsPbBr 3 perovskite nanocrystals anti-counterfeiting PUF light driven