Efficient and Stable Metaphosphate Composite Ceramics for High‐Power‐Driven Near‐Infrared Light Sources

ABSTRACT Near‐infrared phosphor‐converted light‐emitting diodes (NIR pc‐LEDs) are critical components of light sources for applications in biomedical imaging, night vision, and optical sensing. However, conventional encapsulation mode on basis of organic resin and NIR phosphors suffer from several limitations, including low external quantum efficiency (EQE), severe thermal quenching under high‐power excitation, and poor thermal conductivity. These drawbacks collectively constrain overall performance of NIR pc‐LEDs, particularly in achieving high output power and long‐term operational stability. Herein, a series of AlP 3 O 9 :Cr 3+ ‐AlPO 4 metaphosphate composite glass‐ceramics (GCs) are obtained via glass crystallization. Under 450 nm excitation, the optimized GC exhibits a broadband NIR emission centered at 785 nm with an EQE of 65% and retains 93% of its emission intensity at 423 K, demonstrating high efficiency and robust thermal stability. A prototype NIR GC‐converted LED (GC‐LED) achieves an output power of 843 mW at 2000 mA, highlighting its potential for high‐power near‐infrared light sources in various applications. This work presents a scalable strategy for developing high‐power NIR light sources that balance efficiency, stability, and versatility.