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Spatial & Temporal Dual-Resolved Anti-Counterfeiting Applications in a Long Afterglow System Based on Bismuth

Xin Zhang¹, Jing-Xuan Hao¹, Mao-Lin Cai¹

¹Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage and Novel Cell Technology, College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.

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Summary

This study introduces tunable long persistent luminescence (LPL) materials for advanced anticounterfeiting. These novel metal halides offer controllable colors and durations, enhancing security for portable systems.

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Area of Science:

Materials Science
Photochemistry
Solid-State Chemistry

Background:

Anticounterfeiting technologies increasingly rely on long persistent luminescence (LPL) materials.
Current LPL systems face challenges in integrating tunable emission colors and luminescence lifetimes.
Developing advanced, portable anticounterfeiting solutions requires novel materials with enhanced security features.

Purpose of the Study:

To develop a novel temporal and spatial anticounterfeiting strategy using tunable LPL materials.
To investigate the influence of excitation wavelength and doping on LPL properties.
To establish a foundation for multicolor and time-resolved anticounterfeiting systems.

Main Methods:

Synthesis and characterization of zero-dimensional (0D) metal halides (PBA)3BiCl6:xSb3+.
Investigation of long persistent luminescence (LPL) properties under varying excitation wavelengths.
Analysis of emission color transitions and afterglow durations.
Exploration of triplet energy transfer (TET) mechanisms for LPL duration control.

Main Results:

Controllable emission color transitions from green to white to orange were achieved by varying excitation wavelength.
Tunable afterglow durations were observed, with different colors appearing at different delay times.
Sb3+ doping in (PBA)3BiCl6 effectively modulated LPL duration via triplet energy transfer (TET).
Noticeable afterglow luminescence was achieved using a mobile phone flashlight, demonstrating portability.

Conclusions:

The developed (PBA)3BiCl6:xSb3+ materials offer a promising platform for multicolor and time-resolved anticounterfeiting.
The ability to tune both emission color and LPL duration significantly enhances security.
These findings pave the way for advanced, portable anticounterfeiting systems with elevated security levels.