A series of Eu2+ and Sm3+ co-doped Li2SrSiO4 phosphors are prepared by the high temperature solid-state reaction. The morphology, structure and spectroscopic properties of the prepared samples are characterized by scanning electron microscopy, X-ray diffraction, diffuse reflection spectra, photoluminescence spectra and electron paramagnetic resonance spectra, respectively. The effect of Sm3+ doping concentration on the photoluminescence intensity of the prepared samples is also investigated. The results indicate that the crystal structure of Li2SrSiO4 is not changed with the Eu2+, Sm3+ co-doping. The spherical-like particle size of the obtained product is about 20-30 nm in diameter. When the Sm3+ concentration is 0.3 mol% and the Eu2+ concentration is 0.7 mol%, the phosphors show the maximum emission intensity, which is 50% higher than that of Eu2+ doped Li2SrSiO4. Excited at 420 nm, the phosphor presents a single broad emission band peaking at 558 nm, which is ascribed to the 4f(6)5d(1) -> 4f(7) transitions of Eu2+ and (4)G(5/2) -> H-6(5/2) and (4)G(5/2) -> H-6(7/2) transitions of Sm3+. The Commission International de I'Eclairage chromaticity coordinates of Li2SrSiO4: 0.7 mol% Eu2+, 0.3 mol% Sm3+ are x = 0.28, y = 0.28. (C) 2012 Elsevier B. V. All rights reserved.