Design of Barcodes from Y_1.98Dy_0.02XMgTiO₆ (X: Sm³⁺, Sr²⁺, Li⁺) Luminescent Perovskites for High-Security Encryption Coding

Novel barcodes are designed from the emission intensity of a single perovskite nano phosphor matrix Y₂MgTiO₆:Dy³⁺. The inkling of converting the photoluminescence spectra into encryption barcodes is exploited; which could tackle serious anti-counterfeiting applications. The photoluminescence emission intensity varies as a function of doping concentration and the occurrence of various sensitizer ions (Li⁺/ Sr²⁺/ Sm³⁺). A series of 8-bit barcodes were designed concerning the up-conversion and down-conversion emission of Y₂MgTiO₆:Dy³⁺, with peaks positioned at 388 nm, 480 nm, 574 nm, 578 nm, 620 nm, 654 mm, 655 nm, and 670 nm. The as-designed codes remain encrypted in the product so that they cannot be simply imitated by classy counterfeiters. Meanwhile, the matrix recipe and conversion algorithm remain undisclosed by the trader.