Novel multi-stimulus responsive mechanoluminescent phosphor Ca5Ga6O14:Pr3+,Yb3+,Er3+ for dynamic multi-mode anti-counterfeiting

Abstract

Encryption and anti-counterfeiting technologies are important in the field of information security. The traditional luminescent anti-counterfeiting technology uses ultraviolet light to excite and convert luminescence, which is easily counterfeited. In this work, Ca₅Ga₆O₁₄:Pr³⁺ was prepared, which has three luminescence modes: photoluminescence, long persistent luminescence, and mechanoluminescence; when co-doped with Yb³⁺ and Er³⁺ in Ca₅Ga₆O₁₄:Pr³⁺, up-conversion luminescence and near-infrared mechanoluminescence were introduced, because of which its optical anti-counterfeiting ability was further improved. Based on the various luminescence modes of the phosphor mentioned above, a multi-mode anti-counterfeiting model has been designed. The results show that this phosphor has great potential for optical anti-counterfeiting applications, and also provides ideas for the future optical anti-counterfeiting research.