Er3+:Li2Gd4(MoO4)(7) crystal with dimensions of circle divide 20 x 25 mm(3) was grown by the Czochralski method. The thermal properties of Er3+:Li2Gd4(MoO4)(7) crystal were investigated. The spectroscopic properties of Er3+:Li2Gd4(MoO4)(7) crystal were investigated. Based on the Judd-Ofelt theory, the oscillator strength parameters Omega(t) and radiative lifetimes were calculated. The emission cross-sections and gain emission cross-section were calculated. In comparison with other Er3+-doped crystals, Er3+:Li2Gd4(MoO4)(7) crystal may be regarded as a potential solid-state laser host material. (C) 2009 Elsevier B.V. All rights reserved.