Stable Multimode Luminescence Performances of SrGa₁₂O₁₉: Sm³⁺, Tb³⁺ Phosphor for Anti-Counterfeiting Application

Abstract

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 SrGa12O19: Sm3+, Tb3+ phosphors with multi-color luminescence are obtained successfully by the traditional solid-state method. These Sm3+/Tb3+ co-doped phosphors emit green, orange, and yellow-green under the excitation of 254, 365, and 254 nm+365 nm ultraviolet (UV) lamps, respectively. After removal of the UV lamp, the green long persistent luminescence (LPL) phenomenon is exhibited and then vanishes 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, and high temperature, which makes the as-obtained phosphors a great application potential in high-level anti-counterfeiting with high stability.