Stable Multimode Luminescence Performances of SrGa 12 O 19 : Sm 3+ , Tb 3+ Phosphor for Anti-Counterfeiting Application

Fluorescence materials have been widely employed for anti-counterfeiting techniques owing to their high-throughput, facile identification, and simplicity of production. However, the stability of the materials is a prerequisite for their subsequent application. Here, a series of SrGa 12 O 19 : Sm 3+ , Tb 3+ phosphors with multi-color luminescence are obtained successfully by the traditional solid-state method. These Sm 3+ /Tb 3+ co-doped phosphors emit green, orange and yellow-green under the excitation of 254 nm, 365 nm, and 254 nm+365 nm UV lamps, respectively. After removal of the UV lamp, the green long persistent luminescence (LPL) phenomenon is exhibited and then vanished 15 s later. The dynamic PL and LPL are associated with the interaction between PL and trapping centers. Notably, as-obtained phosphors show excellent stability against both air water resistance, and high temperature, which features the as-obtained phosphors a great application potential in high-level anti-counterfeiting with high stability.