The combination of a GaN-based blue LED chip and an yellow phosphor (Ce³⁺:Y₃Al₅O₁₂, Ce:YAG) packed with an epoxy resin is widely used to produce white LEDs. High irradiation and high temperature undercut the luminous efficacy and stability of high-power white LED due to the properties of resins and LED chip. To solve this problem, phosphor materials which are organic resin free, such as Ce:YAG transparent ceramics, low temperature Ce:YAG glass, and Ce:YAG single crystal, are developed. The optical, thermal, and electrical properties of Ce:YAG single crystal make it an important candidate for long lifetime and higher light output white LED applications. In the present work, 0.1~1 mol% Ce₂O₃ was added to the stoichiometric ratio mixture of Y₂O₃ and Al₂O₃ powders, and Ce:YAG single crystals were grown by the Bridgman method. The pulling down rate was 5-15mm/day, and as-grown crystals in diameter about 55mm were obtained. The defects such as inclusions and scatter particles were discussed and the optical and thermal properties are characterized.

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