Achieving multicolor luminescence via Mn2+ single doped in simple CaCdGe7O16 particles for multimode anti-counterfeiting

Abstract

The multicolor and multimode luminescence material possess the advantages of multicolor, multimode luminescence, easy identification, so that it is widely concerned in the field of optical anti-counterfeiting and optical information storage. Therefore, it is makes sense of that this study use the doping of a single luminescent center to regulate the color of the luminescent color instead of simple mixing of different materials to achieve multicolor multimode luminescence. The as-prepared versatile CaCdGe₇O₁₆:Mn²⁺ luminescent microparticles prepared by high-temperature solid-phase method. The luminescent microparticles reveal the color from blue to orange-red under 254 nm UV light, while the 410 nm photoluminescence (PL) is attributed to the photoluminescence of CaCdGe₇O₁₆ (CCGO) host and 606 nm photoluminescence is attributed to the ⁴T₁ - ⁶A₁ transition of Mn²⁺. And revealing orange when 254 nm UV light is turned off or when 254 nm UV light is turned off and heated, along with the change of Mn²⁺ concentration (wavelength is 606 nm), due to the ⁴T₁ - ⁶A₁ transition of Mn²⁺. Under 254 nm UV light irradiation for 4 min, the afterglow time of the materials was 16000 s. Based on these superior properties, this study designs the dynamic multicolor and multimode luminescence Quick Response (QR) code pattern and a binary pattern, which offers the anti-counterfeiting technology toward a wide variety of applications to a certain extent.