Dual-Wavelength Responsive Broad Range Multicolor Upconversion Luminescence for High-Capacity Photonic Barcodes

Realizing multicolor emissions of upconversion (UC) luminescence materials is of significant importance for information security and anticounterfeiting fields. Herein, a strategy is reported to achieve UC multicolor luminescence through manipulating the electronic transition process under dual-wavelength excitation. The novel color can be produced via exploiting the synergistic effect of photons under dual-wavelength excitation to control electron distribution, and can be further modulated by finely adjusting the excitation power. Furthermore, the range of color-tunable emissions is expanded by adjusting Yb3+ ions concentrations due to the energy back transfer (EBT) process. Inspired by this, the materials with broad-range UC multicolor emissions can be used to design high-capacity photonic barcodes for anticounterfeiting applications, which provides a significant step for advanced anticounterfeiting of high level security.

Automated summary

The multicolor emission of upconversion luminescence materials can be achieved by manipulating the electronic transition process under dual-wavelength excitation, controlling electron distribution to produce novel colors with synergistic effect of photons, and further modulated by finely adjusting the excitation power. The range of color-tunable emissions is expanded by adjusting Yb3+ ions concentrations due to the energy back transfer process, which can be used to design high-capacity photonic barcodes for anticounterfeiting applications, providing significant advancements in advanced anticounterfeiting of high level security.