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Published on: January 3, 2018
Realizing Bright-Dark Dual-Field Multimode Optical Signals in Photochromic Apatite Phosphors for Security
Wei Hu1, Yunwen Bao1, Yiqing Zhou1
1Key Laboratory of Light Energy Conversion Materials of Hunan Province College, Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China.
Researchers developed a novel inorganic phosphor (BPCF-AG) with controlled defects for advanced security applications. This material exhibits unique dual-field optical signals, enabling high-security identification and information encryption.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Luminescence
Background:
- Controlling defect distribution in inorganic phosphors is crucial for advanced optical signal applications.
- Achieving multimode dual-field optical signals for high-security identification presents significant challenges.
Purpose of the Study:
- To develop a strategy for regulating trap distribution and density in Ba5(PO4)3Cl:F-,Eu2+,Ce3+ (BPCF-AG) phosphors.
- To investigate the versatile optical behaviors and propose a mechanism for the BPCF-AG phosphor.
- To demonstrate potential applications in security identification and information encryption.
Main Methods:
- Equivalent anion doping and nonequivalent cation doping strategy.
- Synthesis of Ba5(PO4)3Cl:F-,Eu2+,Ce3+ (BPCF-AG) phosphors.
- Thermoluminescence (TL) curve analysis to investigate trap roles.
- Demonstration of dual-field optical signals for security applications.
Main Results:
- Successfully regulated trap distribution and density in BPCF-AG phosphors.
- BPCF-AG exhibits simultaneous photochromism (bright field) and tetramode luminescence (dark field: photoluminescence, afterglow, 980 nm PSL, 650/532 nm PSA).
- Coexistence of shallow and deep traps was identified as responsible for the observed optical behaviors.
Conclusions:
- The proposed doping strategy effectively controls trap properties in BPCF-AG phosphors.
- The BPCF-AG phosphor demonstrates potential for high-security identification and information encryption through its unique dual-field, multimode optical signals.
