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Interstitial Li+ Occupancy Enabling Radiative/Nonradiative Transition Control toward Highly Efficient Cr3+-Based
Fanquan He1, Enhai Song1,2, Hui Chang1
1State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510641, P. R. China.
ACS Applied Materials & Interfaces
|July 5, 2022
Summary
Researchers developed a novel near-infrared (NIR) emitting phosphor, Na3GaF6:Cr3+,Li+, achieving high efficiency and stability. This breakthrough advances smart lighting and secure machine identification technologies.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Photonics
Background:
- Development of efficient and stable broadband near-infrared (NIR) emission phosphors is critical for advanced lighting.
- Discovering suitable phosphors for NIR emission presents significant challenges.
Purpose of the Study:
- To synthesize and characterize a novel NIR-emitting fluoride phosphor, Na3GaF6:Cr3+,Li+.
- To evaluate its performance for smart lighting and emerging NIR applications.
Main Methods:
- Synthesis of Na3GaF6:Cr3+,Li+ phosphor.
- Characterization of its crystal structure and optical properties, including emission spectra and quantum efficiency.
- Fabrication and testing of a NIR light-emitting diode (LED) device.
Main Results:
- Demonstrated NIR emission peaking at 758 nm with high internal (95.8%) and external (38.3%) quantum efficiencies.
- Achieved excellent thermal stability (84.9% intensity retention at 150 °C) and moisture resistance.
- Developed a watt-level NIR LED (974.12 mW output) with 20.9% photoelectric conversion efficiency.
Conclusions:
- Na3GaF6:Cr3+,Li+ is a highly efficient and stable NIR phosphor suitable for next-generation smart lighting.
- The developed NIR LED technology enables novel applications like secure machine identification.
