Mn-doped Zn2SiO4 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 Zn2SiO4. Based on our experimental results, the Mn-doped Zn2SiO4 phosphor shows good hydrothermal stability and base-resistant property, but bad acid-resistant property. (c) 2005 Elsevier B.V. All rights reserved.