Cerium-doped yttrium aluminum garnet (YAG:Ce) as a yellow phosphor for white light-emitting diodes (LEDs) was synthesized via a facile combustion method using Y 2 O 3 , CeO 2 , Al 2 O 3 , Al, and NaClO 4 as raw materials. The combustion synthesis approach utilizes the strong exothermic oxidation of aluminum to realize a self-sustaining reaction. In this study, we investigated the effects of the ratios of Al 2 O 3 to Al, fluxes, and coprecipitated materials as raw materials on the luminescence properties of the synthesized YAG:Ce phosphors. When the amount of Al 2 O 3 x was varied, the combustion reaction proceeded at x ≤ 1.8, with x = 1.725 being the optimum condition for producing a high-performance product. When 5 mass% BaF 2 was added, the luminescence intensity was significantly improved owing to a decrease of YAP (YAlO 3) formation with improved uniformity. However, the addition of CaF 2 and NaF did not improve the luminescence properties. To suppress the segregation of CeO 2 , we used the coprecipitated material Y 2 O 3-CeO 2 as a raw material. Unlike with separate addition of Y 2 O 3 and CeO 2 , Ce ions were uniformly distributed in the coprecipitated material, resulting in improved luminescence properties. The combination of BaF 2 and coprecipitated material significantly improved the internal quantum efficiency to 83.0%, which

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