The crystals of Sm3+-doped KLu(WO4)(2) with large dimensions up to 40 mm x 33 mm x 13 mm have been grown by the top-seeded solution growth (TSSG) method. The spectral and luminescent properties have been investigated. Based on the Judd-Ofelt theory, the following spectral parameters have been obtained: the phenomenological intensity parameters Omega(t), Omega(2) = 15.728 x 10(-20) cm(2), Omega(4) = 4.223 x 10(-20) cm(2) and Omega(6) = 2.839 x 10(-20) cm(2), radiative transition probabilities A(J.J') and (4)G(5/2) is 748 mu s. However, the measured emission lifetime is tau(em) = 569 mu s. oscillator strengths P-J,P-J'. The radiative lifetime of levels 4 G The quantum efficiency is very low because of the excited state absorption. In addition, the values of integrated emission cross-sections are also calculated. (c) 2006 Elsevier Ltd. All rights reserved.