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<p>The complex multi-layered security signals about fluorescence-based anti-counterfeiting technology with smartphone-based readers are getting a lot of attention. The blue/red biobased fluorescent carbon dots (CDs) with an average particle size of 2.73&#xa0;nm are prepared using reed, O-Phenylenediamine (OPD) and Phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) as precursors by a facile hydrothermal method without organic solvents. To prevent carbon dot aggregation and experience self-quenching in water or organic solvents, CDs are embedded into the high-performance porous silica material (MCM-41) by another hydrothermal treatment. In contrast, the silica framework of MCM-41 provides essential physical protection for the CDs, allowing for their uniform distribution within the material. This leads to improved fluorescence intensity, increased fluorescence lifetime of 2.02 ns, and a quantum yield of 33.29%. The matrices on filter paper, hydrogels (cellulose), and membranes (polyvinyl alcohol) with CDs@MCM-41 demonstrate distinct color variations under daylight, UV light, and a filter, this capability facilitates simple yet effective multi-layer security features for anti-counterfeiting applications, with accurate and fast color analysis can be achieved through the RGB software on a smartphone.</p>

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Construction of High-Efficiency Blue/Red Fluorescent Dual Anti-Counterfeiting Based on Reed-Based Carbon Dots/MCM-41 System and Smartphone RGB Analysis

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Lifan Zhang,
  • Jinwang Gao,
  • Haiyang Han,
  • Xiaoke K. Wang,
  • Li Huo

摘要

The complex multi-layered security signals about fluorescence-based anti-counterfeiting technology with smartphone-based readers are getting a lot of attention. The blue/red biobased fluorescent carbon dots (CDs) with an average particle size of 2.73 nm are prepared using reed, O-Phenylenediamine (OPD) and Phosphoric acid (H3PO4) as precursors by a facile hydrothermal method without organic solvents. To prevent carbon dot aggregation and experience self-quenching in water or organic solvents, CDs are embedded into the high-performance porous silica material (MCM-41) by another hydrothermal treatment. In contrast, the silica framework of MCM-41 provides essential physical protection for the CDs, allowing for their uniform distribution within the material. This leads to improved fluorescence intensity, increased fluorescence lifetime of 2.02 ns, and a quantum yield of 33.29%. The matrices on filter paper, hydrogels (cellulose), and membranes (polyvinyl alcohol) with CDs@MCM-41 demonstrate distinct color variations under daylight, UV light, and a filter, this capability facilitates simple yet effective multi-layer security features for anti-counterfeiting applications, with accurate and fast color analysis can be achieved through the RGB software on a smartphone.