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Geminate labels programmed by two-tone microdroplets combining structural and fluorescent color.

Lang Qin1, Xiaojun Liu1, Kunyun He1

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Researchers developed novel two-tone inks for advanced anti-counterfeiting security labels. These inks display distinct information in both reflective and fluorescent states, enhancing protection against counterfeit products.

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Area of Science:

  • Materials Science
  • Optics
  • Chemistry

Background:

  • Developing security labels with dual-mode information (reflective and fluorescent) is crucial for anti-counterfeiting but faces significant challenges.
  • Existing methods often involve trade-offs, compromising either reflective or fluorescent properties, thus jeopardizing information integrity.

Purpose of the Study:

  • To engineer a novel strategy for creating security labels with distinct and intact information in both reflective and fluorescent states.
  • To overcome the limitations of current anti-counterfeiting technologies by decoupling reflective and fluorescent properties.

Main Methods:

  • Fabrication of fluorescent cholesteric liquid crystal microdroplets using a capillary microfluidic technique.
  • Programming microdroplets to exhibit structural color from helical superstructures, effectively 'coating' the luminescent material.
  • Development of 'geminate' labels integrating these two-tone inks.

Main Results:

  • Successfully created microdroplets that display different, yet intact, information in both reflective and fluorescent modes.
  • Demonstrated the integrity of information in both states, addressing the trade-off issue.
  • Validated the potential of these two-tone inks for robust anti-counterfeiting applications.

Conclusions:

  • The developed geminate labels, utilizing programmed fluorescent cholesteric liquid crystal microdroplets, offer a promising solution for advanced anti-counterfeiting.
  • This two-tone ink strategy provides a versatile platform for encrypting and protecting valuable authentic information.
  • The technique significantly enhances security features for applications ranging from currency to pharmaceuticals.