The solvothermal synthesis and structural characterization of silicate based oxyapatite activated (CGS) nanophosphors have been reported. The structure of these phosphors was elucidated by the powder x-ray diffraction (XRD) and further characterized by scanning electron microscopy. The XRD results revealed that the obtained shows the characteristic peaks of oxyapatite in a hexagonal lattice structure. The photoluminescence (PL) properties were studied with variations of concentration and sintering temperature. Under excitation, both and characteristic emissions associated with 4f–4f transitions have been observed, and when the concentration of increases above the emission intensity decreases due to cross relaxation. The emission intensity decreases with increasing concentration and the PL intensity of at excitation was much weaker than the obtained intensity with excitation at , suggesting that the efficient energy transfer occurred from to ions in CGS host lattice. The decay curves of the level show that the lifetime decreases with increasing crystallite size and concentration of ions. These luminescent powders are expected to find potential applications such as white light emitting diodes and optical display systems.