Advanced Luminescence Anticounterfeiting Based on Dynamic Photoluminescence and Non-Pre-Irradiation...

Luminescence anticounterfeiting is one of the most significant technologies to protect information security. However, the luminescence of the present anticounterfeiting logo is static, which is easily counterfeited by substitutes, and it always requires an ultraviolet lamp in use, which is inconvenient in application. In this work, according to the present deficiencies of luminescence anticounterfeiting, an interesting phosphor CaZnGe₂O₆/Mn²⁺ with unique features of dynamic photoluminescence and non-pre-irradiation mechanoluminescence is developed for the first time. The photoluminescence color of the phosphor can dynamically change from green to red during irradiation, and the non-pre-irradiation mechanoluminescence of the phosphor-based elastomer can be easily stimulated by mechanics such as stretching, bending, or scratching with a finger. By combining the two features of the CaZnGe₂O₆/Mn²⁺ phosphor, an advanced dual-mode luminescence anticounterfeiting is designed, and a luminescence logo is fabricated for the anticounterfeiting test. The result demonstrates that this advanced luminescence anticounterfeiting based on the phosphor is not only safer but also more convenient in application.