부산대학교 도서관

Rare earth ion-doped upconversion luminescent materials have found extensive utility in anti-counterfeiting applications. However, in practice, single-mode photoluminescence falls short of addressing increasingly intricate demands of contemporary anti-counterfeiting measures. This work presents successfully synthesized dual-mode excited SrBi4Ti4O15 upconversion phosphor doped with Yb3+/Er3+, designed to emit two distinctive colors, green and red under excitation at either 980 or 1550 nm. Introduction of the multi-color emission significantly enhances the security of anti-counterfeiting strategies in a variety of modes. A comprehensive investigation is conducted into potential upconversion mechanisms driven by different excitation sources, examining both 980 and 1550 nm wavelengths. Anti-counterfeiting properties are evaluated for synthesized phosphor by gauging the luminous intensity ratio between red and green light. Research findings unequivocally point to the immense potential of SrBi4Ti4O15 upconversion phosphor doped with Yb3+/Er3+ for robust multimode anti-counterfeiting applications, representing a promising development in this field.