Multilevel Static-Dynamic Anticounterfeiting Based on Stimuli-Responsive Luminescence in a Niobate Structure

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Conventional anticounterfeiting methods using downconversion luminescence are vulnerable to replication.
• There is a critical need for advanced security features to combat product counterfeiting.
• Niobate-based materials offer potential for diverse luminescent properties.

Purpose of the Study:

• To develop novel anticounterfeiting strategies using multiple luminescence modes.
• To explore the luminescent properties of rare-earth-doped lithium niobate (LiNbO3:RE3+).
• To create multilevel anticounterfeiting devices and applications.

Main Methods:

• Synthesis of rare-earth-doped lithium niobate (LiNbO3:RE3+) structures.
• Investigation of six distinct luminescence modes, including photostimulated luminescence (PSL) and upconversion luminescence (UCL).
• Development of dual-mode and four-mode anticounterfeiting devices incorporating mechanoluminescence (ML), persistent luminescence (PL), PSL, and UCL.

Main Results:

• Achieved six luminescent modes in LiNbO3:RE3+, including novel PSL and UCL color evolution.
• Demonstrated dual-mode anticounterfeiting using ML and PL without direct irradiation.
• Created a four-mode anticounterfeiting trademark (downconversion, thermo-, photo-, and upconversion luminescence) for static-dynamic display and freshness indication.

Conclusions:

• The developed multilevel anticounterfeiting strategies offer enhanced security against counterfeiting.
• Niobate-based luminescent materials provide a versatile platform for advanced anti-fraud solutions.
• These strategies have broad applicability across various industries to protect products and consumers.