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A long persistent phosphor based on recombination centers originating from Zn imperfections
Yang Li1, Xi Du1, Kaniyarakkal Sharafudeen1
1State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, School of Materials Science and Technology, South China University of Technology, Guangzhou 510640, China.
Summary
This study reports a novel blue-white long persistent luminescence from zinc imperfections in a ZnO-based phosphor, observable for over two hours. Further doping with chromium yielded a warm white persistent phosphor.
Area of Science:
- Materials Science
- Solid State Physics
- Luminescence
Background:
- Zinc (Zn) imperfections are known for recombination luminescence.
- Limited research exists on Zn imperfections as emitting centers for long persistent luminescence (LPL).
Purpose of the Study:
- To investigate long persistent luminescence from Zn imperfections in a ZnO-based phosphor.
- To characterize the trapping properties responsible for the luminescence.
- To develop a warm white persistent phosphor.
Main Methods:
- Synthesis of 6 ZnO:3 GeO2:Al2O3 phosphor doped with Zn imperfections.
- Observation and characterization of persistent luminescence.
- Thermoluminescence (TL) spectra measurements.
- Photo-stimulated luminescence (PSL) decay curve analysis.
- Doping with chromium (Cr3+) to achieve warm white emission.
Main Results:
- Observed blue-white long persistent luminescence from Zn imperfections in 6 ZnO:3 GeO2:Al2O3.
- Luminescence persisted visibly for over 2 hours.
- Trap properties were elucidated using TL and PSL measurements.
- A warm white persistent phosphor was successfully developed by Cr3+ doping.
Conclusions:
- Zn imperfections can act as effective emitting centers for long persistent luminescence in ZnO-based phosphors.
- The developed phosphor exhibits promising persistent luminescence properties.
- The material holds potential for applications requiring long-lasting light emission.
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