Spy Must Be Spotted: A Multistimuli-Responsive Luminescent Material for Dynamic Multimodal Anticounterfeiting and...

Area of Science:

• Materials Science
• Chemistry
• Optics

Background:

• Luminescent materials are crucial for anticounterfeiting and encryption technologies.
• Developing materials with dynamic, multi-stimuli responsive properties is essential for advanced security applications.

Purpose of the Study:

• To develop a novel, multi-stimuli responsive luminescent material for dynamic anticounterfeiting and encryption.
• To demonstrate the application of this material in creating luminescent images with variable patterns and colors.

Main Methods:

• Synthesis and characterization of Na₂CaGe₂O₆:Pb²⁺/Er³⁺ phosphor.
• Fabrication of luminescent images using the synthesized material.
• Evaluation of photoluminescence and upconversion luminescence under various stimuli.
• Testing photostimulated luminescence (PSL) for dynamic anticounterfeiting and encryption scenarios.

Main Results:

• The Na₂CaGe₂O₆:Pb²⁺/Er³⁺ material exhibits multi-stimuli responsive luminescence, displaying different patterns and colors.
• Printed luminescent images showed dynamic changes in appearance under photostimulated luminescence (PSL).
• The material was successfully applied for dynamic multimodal anticounterfeiting on banknotes and in a virtual war scenario for secure encryption.

Conclusions:

• The developed luminescent material offers a novel approach for dynamic anticounterfeiting and secure encryption.
• The material's ability to produce variable luminescent outputs under different stimuli provides robust security features.
• This research opens avenues for innovative security designs utilizing responsive luminescent materials.