Developing a Near-Infrared Garnet Phosphor with Near-Unity Internal Quantum Efficiency and Wide-Range Spectral Tunability

] unit, and the IQE still maintains over 90% when the emission peak gradually shifts to 830 nm. Finally, the applications of the developed materials in nondestructive testing, information encryption, and organic matter analysis were demonstrated, which confirmed the feasibility of these materials in multifunctional spectroscopy applications.