YVO4:Bi3+,Eu3+ nanophosphor converts near ultraviolet light to red light and shows lower scattering loss for visible light and longterm photostability. Therefore, the authors produce urethane resin films containing YVO4:Bi3+, Eu3+ nanophosphors on soda-lime glass substrates as spectral shifters to understand the effects of doping of Bi3+ and Eu3+ into YVO4 and the Bi3+ concentration on photoelectric conversion efficiencies of a monocrystalline silicon photovoltaic module. Under ultraviolet and near infrared light radiation, the YVO4:Bi3+,Eu3+ films enhance the photoelectric conversion efficiency of the module through spectral down-shifting as compared to the bare glass substrate and the YVO4 film. In contrast, the YVO4:Bi3+,Eu3+ films are not effective for improving the photoelectric conversion efficiency under the simulated solar light radiation. These results are discussed from the aspects of the optical transparency and the photoluminescence properties. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.084203jes] All rights reserved.