Graphene quantum dots as full-color and stimulus responsive fluorescence ink for information encryption

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Developing robust anti-counterfeiting methods is crucial.
• Photoluminescent materials offer unique encryption capabilities.
• Graphene quantum dots (GQDs) present a promising platform for advanced security features.

Purpose of the Study:

• To develop a novel anti-counterfeiting technique using graphene quantum dots (GQDs).
• To achieve full-color and stimuli-responsive information encryption.
• To create printable fluorescent inks for practical applications.

Main Methods:

• Synthesized red, green, and blue (RGB) fluorescent GQDs via one-step hydrothermal/solvothermal reactions.
• Prepared printable fluorescent inks by dispersing GQDs in glycerol-containing ethanol.
• Utilized color, fluorescence spectra, and stimuli-responsive properties for encryption and decryption.

Main Results:

• Demonstrated successful full-color information encryption and decryption under UV light.
• Showcased stimuli-responsive encryption using ion-quenchable and recoverable fluorescence.
• Achieved order-sensitive stimulus-responsive encryption by combining N, S-doped GQDs with lanthanide complexes.

Conclusions:

• Graphene quantum dots offer a versatile and effective platform for advanced anti-counterfeiting solutions.
• The developed printable inks and encryption strategies provide a scalable approach for security applications.
• Stimuli-responsive properties of GQDs enhance the security and complexity of encrypted information.