In this investigation the binary mixture of two well-characterized photosensitizers, namely, tris-1,10-phenanthroline iron(II)-bis-(1-ethoxy carbonyl-1-cyanoethylene-2,2-dithiolato) dioxouranate(VI), [Fe(phen)(3)][UO2(ecda)(2)], and rose bengal, has been used for spectral sensitization of nanocrystalline ZnO thin-film electrode in acetonitrile medium with an objective for achieving the light absorption over a wider range of spectra. The comparison of current-potential curve of the mixed dye-modified ZnO electrode with those of ZnO electrodes sensitized by constituent dyes individually has provided clear evidence for the sensitization of photocurrent by both dyes together, contributing almost additively to the total sensitized photocurrent. The quantum efficiencies (APCE) at the excitation wavelengths of 510 and 555 nm (lambda(max) of [Fe(phen)(3)][UO2(ecda)(2)] and rose bengal, respectively) were found to be 7.9 and 10%, respectively, with the mixed dye-sensitized ZnO electrode. (C) 2004 The Electrochemical Society.