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Bismuth doped Y 2 O 3 : Eu was used as a red phosphor with a very high efficiency and an appropriate emission wavelength of around 310-400 nm. This red phosphor was synthesized by the solid state reaction which is normally used in the field of white LEDs. In this study, we synthesized Y 2 O 3 : Eu, Bi phosphors using a solid state reaction. We investigated the effect of the Eu 3+ and Bi 3+ concentrations and additive fluxes on the emission characteristics. The fabricated phosphors were investigated by analyzing their particle size and crystal structure with scanning electron microscopy and X-ray diffraction (XRD). Their photoluminescence (PL) spectra were also measured at room temperature.