LaBaCo2O5 (+) (delta) (LBCO) materials are considered promising for a number of important technologies such as solid oxide fuel cells, batteries, chemical sensors, and thin-film functional devices related to giant magnetoresistance and spintronics. In this work, we report the optical properties of LBCO films, which were deposited on MgO (001) substrate by exploring the optimized growth using a radio-frequency magnetron sputtering method. The LBCO film was found having an optical response different from a typical metal or a semiconductor. The LBCO film has rather large optical absorption, which almost linearly decreases from 3.7 x 10(5) to 6.7 x 10(3) cm(-1) in the spectral range from 4.5 to 0.1 eV. The optical conductivity suggests that the LBCO films have potential for applications of optoelectronic devices, such as photodetectors and solar cells. (C) 2016 Elsevier B.V. All rights reserved.