Mn-doped Zn 2 SiO 4 phosphor was synthesized via a two-stage aging–crystallization hydrothermal route without further calcining treatment. The samples were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FE-SEM), and photoluminescence (PL). It was found that appropriate aging temperature and aging time played important roles in obtaining pure hexagonal structural Zn 2 SiO 4 . Based on our experimental results, the Mn-doped Zn 2 SiO 4 phosphor shows good hydrothermal stability and base-resistant property, but bad acid-resistant property.