A white light emitting Ca_xSr_1-xAl₂O₄:Tb³⁺;Eu³⁺ phosphor was synthesized by a combustion method using metal nitrates as precursors and urea as a fuel. The X-ray diffraction patterns from the samples showed phases associated with monoclinic structures of CaAl₂O₄ and SrAl₂O₄. White photoluminescence with the CIE coordinates (x = 0.343, y = 0.325) was observed when the phosphor was optically-excited at 227 nm using a monochromatized xenon lamp. The white photoluminescence was a result of the combination of blue and green line emissions from Tb³⁺, and red line emission from Eu³⁺. The structure and photoluminescence properties of this phosphor are reported.