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Light-Emitting Atomically Precise Nanocluster-Based Flexible QR Codes for Anticounterfeiting.

Jose V Rival1,2, Paloli Mymoona1,2, Rajendran Vinoth2,3

  • 1Smart Materials Lab, Electrochemical Power Sources (ECPS) Division, Council of Scientific and Industrial Research (CSIR)-Central Electrochemical Research Institute (CECRI), Karaikudi 630003, Tamil Nadu, India.

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Summary
This summary is machine-generated.

Researchers developed a low-cost, stable luminescent ink using atomically precise nanoclusters for anticounterfeiting security labels. This novel ink enables secure printing and smartphone-based verification, offering a reliable solution to global counterfeiting challenges.

Keywords:
anticounterfeitingflexible QR codeslight-emitting nanoclustersluminescent inksoptical contrast illusionself-assemblystencil printing

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Advanced anticounterfeiting methods face cost and reliability issues.
  • Light-emitting atomically precise nanoclusters offer well-defined structures and stable photoluminescence.
  • Nanoclusters are promising building blocks for novel security applications.

Purpose of the Study:

  • To develop a low-cost, stable, and flexible luminescent ink for anticounterfeiting.
  • To create optically unclonable security labels using stencil printing.
  • To demonstrate smartphone-based reading and secure information protection.

Main Methods:

  • Room temperature fabrication of nanocluster-based luminescent ink.
  • Stencil printing of security labels.
  • Spectroscopic and microscopic characterization of nanocluster stability.
  • Testing mechanical, thermal, photo, and aqueous stability.
  • Implementation of optical contrast illusion for information decryption.

Main Results:

  • A stable, flexible, nontoxic, and low-cost nanocluster-based luminescent ink was successfully fabricated.
  • The ink exhibits brilliant photoluminescence due to extended C-H···π/π···π interactions.
  • Printed security labels demonstrated exceptional stability and allowed for smartphone-based reading of QR codes.
  • Confidential information protection and decryption were achieved using optical contrast illusion.
  • The security label cost is approximately $0.013 USD per stamp.

Conclusions:

  • Atomically precise nanoclusters provide a robust platform for advanced anticounterfeiting solutions.
  • The developed luminescent ink and security labels offer a cost-effective and reliable method for combating counterfeiting.
  • This technology enables secure, verifiable, and easily accessible anticounterfeiting measures.