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Single-phase yellow phosphor, CaGd2-xZrSc(AlO4)(3):xCe(3+) (CGZSA:Ce3+), possessing cubic symmetry with varied Ce3+ concentrations, was synthesized using the solid-state reaction method. The samples were characterized using X-ray diffraction (XRD), excitation spectra, emission spectra, thermal quenching, and decay curves. The cubic phase of CGZSA:Ce3+ phosphor was confirmed via XRD analysis. The photoluminescence spectra of CGZSA:Ce3+ phosphor demonstrated that the phosphor could be excited at the wavelength of 440 nm; a broad yellow emission band was centered at 541 nm. These results indicate that the phosphors are adequately excited by blue light and have the potential to function as yellow-emitting phosphors for applications in white lightemitting diodes.