Achieving Multimodal Emission in Zn<sub>4</sub>B<sub>6</sub>O<sub>13</sub>:Tb<sup>3+</sup>,Yb<sup>3+</sup> for Information Encryption and Anti-counterfeiting
With the rapid development of technology, information security has always been considered a major challenge. In this work, the excellent combination of persistent luminescence, photoluminescence, up-conversion luminescence, and thermo-luminescence in a particular material Zn4B6O13:Tb3+,Yb3+ synthesized via a solid-state reaction is reported, which can be used for the information encryption and anti-counterfeiting. Tb3+ ions were chosen as the emitting centers for multimodal emissions, and Yb3+ codoping can be used as electron traps and sensitizer to adjust trap distribution and efficient up-conversion luminescence in rare-earth-doped luminescent materials. Besides, the as-prepared luminescent materials exhibit high thermal stability and excellent water resistance. On the basis of these properties, the samples were used to print luminescent images through a screen printing process on the film and banknote. The luminescent image in a film is showing different patterns and on a banknote is showing green emissions under different stimulations. These multimodal emissions demonstrate that the as-prepared sample is suitable for advanced information encryption and anti-counterfeiting.
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Zhao, Shanshan; Wang, Zhenbin; Ma, Zhidong; Fan, Feiyue; Liu, Weisheng (2020): Achieving Multimodal Emission in Zn4B6O13:Tb3+,Yb3+ for Information Encryption and Anti-counterfeiting. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.0c02019