Rare earth-based halide double perovskite phosphor Cs2NaScCl6: Yb3+, Er3+ for multi-mode anti-counterfeiting application.

• Cs 2 NaScCl 6 : Yb3+, Er3+ was prepared through solvothermal method. • UC and DC properties of sample were investigated. • Potential application in anti-counterfeiting was evaluated. At present, most fluorescent anti-counterfeiting technologies on the market are based on single-mode luminescence, which generally have poor anti-counterfeiting capabilities. Thus, developing multi-mode luminescent anti-counterfeiting materials that combine dynamic and static luminescence is a particularly urgent task. In this study, Cs 2 NaScCl 6 : Yb3+, Er3+phosphors were successfully prepared using the solvothermal method. These materials can emit bright green light under 980- or 1550-nm infrared laser irradiation and red light under 365-nm ultraviolet lamp illumination. In addition, by increasing the 980-nm laser power density from 20 to 309 mW/cm2, the luminescence colour can be adjusted from green to yellow, which equips this sample with an outstanding potential for dynamic anti-counterfeiting. Finally, screen printing technology was used to assess the sample's anti-counterfeiting capacity, and the sample was found to be an excellent anti-counterfeiting luminescent material. Stimulus-mode dependent multi-color emitting phosphor Cs 2 NaScCl 6 : Yb3+, Er3+exhibits green emission with the irradiation of 1550 and 980 nm laser and red emission under excitation of 365 nm UV lamp, but yellow emission with the increase of 980 nm laser power density, which present great potential application in anti-counterfeiting field. [Display omitted] [ABSTRACT FROM AUTHOR]