白光LED用定向凝固Al₂O₃/YAG: Ce³⁺共晶荧光复合陶瓷研究进展

White light emitting diode (WLED) is considered as a fourth-generation green light source and presents some applications in lighting fields due to its advantages of long service life, high luminous efficiency, and free environmental pollution. The exisiting main commercialization use of WLED is a blue chip combined with YAG: Ce³⁺ phosphor. However, the luminescence performance of the WLED gradually declines with the increase of temperature due to a poor thermal conductivity of the resin encapsulating the phosphor, thus becoming difficult to apply to high-power lighting. It is necessary to obtain the superior phosphor materials with high quality and stability. In recent years, directionally solidified Al₂O₃/YAG: Ce³⁺ eutectic phosphor composite is considered as a novel bulk phosphor material for a high-power WLED lighting, which is expected to substitute conventional phosphors, due to its excellent luminous properties, high temperature strength and thermal stability, low power consumption as well as superior quantum efficiency. This review summarized the main preparation technologies of Al₂O₃/YAG: Ce³⁺ eutectic phosphor composite. Meanwhile, the microstructure, luminescence mechanism, and influential factors of the Al₂O₃/YAG: Ce³⁺ eutectic phosphor composite were analyzed. In addition, the future development direction was also discussed.