Present study throuws light on solid state synthesis, phase and band properties of a Dy3+ doped Ca3MgSi2O8. Crystal phase of the phosphor was characterized by X-ray diffraction (XRD) and surface morphology was crystal size was determined by using scanning elelctron microscopy (SEM), and transmission electron microscopy (TEM) respectively. To detemine the band gap behaviour of the crystal absorption spectra was used, which was further analyzed by using Tauc plot. The band gap is calculated ≈4.5eV, which decreases on increasing doping concentration of Dy3+.