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Patterned Lead-Free Double Perovskite/Polymer Fluorescent Piezoelectric Composite Films for Advanced
Jindou Shi1, Zeyu Wang2,3, Nanxiang Jia1
1Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education International Center for Dielectric Research&Shaanxi Engineering Research Center of Advanced Energy Materials and Devices, Xi'an Jiaotong University, Xi'an, 710049, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 11, 2024
Summary
This study introduces advanced fluorescent piezoelectric composite films for enhanced anti-counterfeiting. These materials offer multi-modal encryption, improving security beyond traditional methods.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Current anti-counterfeiting technologies face limitations due to narrow wavelength responses.
- Sophisticated encryption methods are crucial for modern data and information security.
- Single fluorescent technologies are insufficient for contemporary security demands.
Purpose of the Study:
- To develop advanced, lead-free double perovskite (DP)/poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) composite films for multi-modal anti-counterfeiting.
- To integrate up-conversion and down-conversion photoluminescence with piezoelectric properties for triple-layer encryption.
- To create a flexible, multifunctional anti-counterfeiting device for enhanced information security.
Main Methods:
- Fabrication of patterned, lead-free DP/P(VDF-TrFE) fluorescent piezoelectric composite films.
- Integration of Cs2Na0.8Ag0.2BiCl6:Yb3+/Er3+ DP crystals with P(VDF-TrFE) film.
- Utilizing 365 nm UV and 980 nm IR light for fluorescent signal detection and pressure application for electrical signal generation.
Main Results:
- Composite films exhibit both up-conversion and down-conversion photoluminescence.
- Concealed information is observable under UV and IR light excitation.
- Applied pressure generates electrical signals, enabling multi-modal encryption and a triple-layer security system.
Conclusions:
- The developed composite films offer a significant advancement in high-level anti-counterfeiting.
- The multifunctional device provides synergistic protection of information security across various fields.
- This technology addresses the limitations of traditional optical anti-counterfeiting methods.
