Abstract: The Ca₃Al₂O₆:Eu³⁺ red phosphor is synthesized by sol-gel method.The XRD, SEM, and fluorescence spectrum characterize the structure, shape and luminous property of the sample. And sintering temperature, the effects of Eu³⁺ ion doping concentration, and charge compensations doping on the sample are discussed in the paper. The results show: the sample's crystal phase is the same with Ca₃Al₂O₆ crystal structure and their crystal structure is not change with the invasion of Eu³⁺ ion. The synthesized phosphor, excited by 394 nm NUV-light, emits 615 nm bright red light. The emission intensity rises first with the increasing of the sintering temperature and then decreases and reaches at peak when sintering temperature is 1200 ℃. At the same time, the emission intensity of the sample increases first and then decreases with the increasing of the concentration of Eu³⁺ion and the optimal doping concentration of Eu³⁺ ion is 4 mol%. Besides, the emission intensity rises with doping charge compensations which doped with K⁺ ion has the best luminescent properties. This red phosphor of aluminates is stable, which makes it potential to be applied as a material in the White-LED's NUV-chip.