In this study, a novel approach for preparation of terbium-doped yttrium oxide phosphors (Y2O3: Tb) by using the bicontinuous cubic phase (BCP) process was reported. EDS analysis revealed the homogeneous precipitation occurred in the BCP structure. The experimental results showed that the prepared precursor powder was yttrium hydroxide with a spherical shape, primary size 30-50nm, and amorphous structure. High crystallinity phosphors with body-centered cubic structure were obtained after heat treatment above 700oC for 4h. However, the primary size of phosphors grew to 100-200nm and the dense agglomerates with a size below 1µm were formed during the calcination. The photoluminescence analysis showed that the obtained Y2O3: Tb phosphor had a strong green emitting at 544nm. The strongest emitting intensity occurred at Tb concentration of 1mol%. This study indicated that the BCP process could be used to prepare the highly efficient yttrium oxide-based green emitting phosphors.