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

Jose V Rival^1,2, Paloli Mymoona^1,2, Rajendran Vinoth^2,3

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.

ACS Applied Materials & Interfaces

|February 16, 2021

Summary

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:

anticounterfeiting flexible QR codes light-emitting nanoclusters luminescent inks optical contrast illusion self-assembly stencil 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.