Affiliation:
1. School of Chemistry and Chemical Engineering State Key Laboratory of Featured Metal Materials and Life‐cycle Safety for Composite Structures Guangxi Key Laboratory of Electrochemical Energy Materials Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development. Guangxi University Nanning 530004 China
2. Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization College of Materials and Chemical Engineering Hezhou University Hezhou 542899 China
Abstract
AbstractThe escalating demand for portable near‐infrared (NIR) light sources has posed a formidable challenge to the development of NIR phosphors characterized by high efficiency and exceptional thermal stability. Taking inspiration from the chemical unit co‐substitution strategy, high‐performance tunable (Lu3‐xCax)(Ga5‐xGex)O12:6%Cr3+ (x = 0–3) phosphors are designed with an emission center from 704 to 780 nm and a broadest full width at half maximum (FWHM) of up to 172 nm by introducing Ca2+ and Ge4+ ions into the garnet structure. In particular, Lu3Ga5O12:6%Cr3+ demonstrates an anti‐thermal quenching phenomenon (I423K = 113.1%). Compared to Lu3Ga5O12:6%Cr3+, Lu2CaGa4GeO12:6%Cr3+ exhibits significantly improved FWHM and IQE by 108 nm and 25.5%, respectively, while maintaining good thermal stability (I423K = 80.4%). Finally, Lu2CaGa4GeO12:6%Cr3+ phosphor is combined with a 465 nm blue LED chip to fabricate NIR LED devices, exhibiting a NIR electroluminescence efficiency of 13.31%@100 mA and demonstrating successful applications in nocturnal illumination and biomedical imaging technology. This work offers a fresh perspective on the design of highly efficient NIR garnet phosphors.
Funder
Specific Research Project of Guangxi for Research Bases and Talents
Natural Science Foundation of Guangxi Province
National Natural Science Foundation of China