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<p>The rapid progress of science and technology has led to the maturation of counterfeiting technologies, making it imperative to develop eco-friendly, cost-effective, and high-performing anti-counterfeiting materials. We prepared multicolor-tunable circularly polarized fluorescence (CPL) films using the evaporation-induced self-assembly (EISA) method, with cellulose nanocrystal (CNC) as the main body and CdTe quantum dots as the object. Waterborne polyurethane (WPU) was added to improve film brittleness and regulate the UV maximum absorption wavelength, investigating the changing rule of the film CPL signals. As WPU content increases, the film’s maximum absorption wavelength red-shifts, and the CPL signal is strongest when it matches the fluorescence emission wavelength. The addition of CdTe quantum dots has minimal impact on the films’ structure and mechanical properties. Thus, the prepared cellulose-based structured color/fluorescence films have good mechanical properties and dual optical encryption properties, offering a novel idea for chiral optical encryption devices and anti-counterfeiting functional materials.</p> Graphical abstract <p></p>

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Fabrication of cellulose nanocrystal-based fluorescent anti-counterfeiting films via evaporation-induced self-assembly

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Yi Zhang,
  • Shulin Cai,
  • Jun Hu,
  • Yukun Chen,
  • Jianming Wu,
  • Lihong Geng

摘要

The rapid progress of science and technology has led to the maturation of counterfeiting technologies, making it imperative to develop eco-friendly, cost-effective, and high-performing anti-counterfeiting materials. We prepared multicolor-tunable circularly polarized fluorescence (CPL) films using the evaporation-induced self-assembly (EISA) method, with cellulose nanocrystal (CNC) as the main body and CdTe quantum dots as the object. Waterborne polyurethane (WPU) was added to improve film brittleness and regulate the UV maximum absorption wavelength, investigating the changing rule of the film CPL signals. As WPU content increases, the film’s maximum absorption wavelength red-shifts, and the CPL signal is strongest when it matches the fluorescence emission wavelength. The addition of CdTe quantum dots has minimal impact on the films’ structure and mechanical properties. Thus, the prepared cellulose-based structured color/fluorescence films have good mechanical properties and dual optical encryption properties, offering a novel idea for chiral optical encryption devices and anti-counterfeiting functional materials.

Graphical abstract