Optical anti-counterfeiting and information storage based on rare-earth-doped luminescent materials

Zhang, Chengyun; Yin, Qingxin; Ge, Shuangkang; Qi, Jianxia; Han, Qingyan; Gao, Wei; Wang, Yongkai; Zhang, Mingdi; Dong, Jun

doi:10.1016/j.materresbull.2024.112801

Materials Research Bulletin

2024

DOI: 10.1016/j.materresbull.2024.112801

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Optical anti-counterfeiting and information storage based on rare-earth-doped luminescent materials

Chengyun Zhang,

Qingxin Yin,

Shuangkang Ge

et al.

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Cited by 15 publications

References 74 publications

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Photonic Inks with Dual‐Layer Security Features by Encapsulation of Color Tunable Fluorescent Dyes in PMMA Colloidal Microspheres

Lekshmanan,

Pillai,

Thomas

et al. 2024

Small Methods

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To counter economic terrorism by preventing counterfeit currency, documents and high‐value commercial products, new‐generation security inks with multiple safety features are required. Herein, color‐tunable pyrylium and pyridinium dye‐encapsulated polymethyl methacrylate (PMMA) colloidal microspheres are reported to exhibiting brilliant emission and photonic properties. A combination of the PMMA colloidal photonic ink having structural color variation and the dye‐encapsulated colloidal photonic ink with fluorescence modulation is used for security labeling. The angle‐dependent structural color variations, a remarkable 250‐fold fluorescence enhancement, non‐toxicity, and the rare earth‐free formulation have made the ink novel and suitable for dual‐layer high‐security printing. Covert security patterns and labels are made overt under 365 nm UV light, while also exhibiting angle‐dependent structural color. The increased level of security with developed photonic colloidal inks is demonstrated with dual‐layer screen‐printed images and patterns on flexible substrates.

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Photonic Inks with Dual‐Layer Security Features by Encapsulation of Color Tunable Fluorescent Dyes in PMMA Colloidal Microspheres

Lekshmanan,

Pillai,

Thomas

et al. 2024

Small Methods

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Promising excitation-responsive phosphors Ca MgSi2O+5: Eu2+, Dy3+ with dual-mode luminescent centers for advanced anti-counterfeiting technology

Zhang,

Han,

Cui

et al. 2024

Ceramics International

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Multimodal spectral emissions in Tb3+/Yb3+ ions doped/co-doped self-activated LaNbO4 phosphor: Applications as 3D imaging for security and solar cells

Modanwal,

Roy,

Mishra

et al. 2024

Journal of Alloys and Compounds

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Optical anti-counterfeiting and information storage based on rare-earth-doped luminescent materials

Cited by 15 publications

References 74 publications

Photonic Inks with Dual‐Layer Security Features by Encapsulation of Color Tunable Fluorescent Dyes in PMMA Colloidal Microspheres

Photonic Inks with Dual‐Layer Security Features by Encapsulation of Color Tunable Fluorescent Dyes in PMMA Colloidal Microspheres

Promising excitation-responsive phosphors Ca MgSi2O+5: Eu2+, Dy3+ with dual-mode luminescent centers for advanced anti-counterfeiting technology

Multimodal spectral emissions in Tb3+/Yb3+ ions doped/co-doped self-activated LaNbO4 phosphor: Applications as 3D imaging for security and solar cells

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