Dye-sensitized solar cells (DSSCs) are composed of an electrode made of a dye-adsorbed nanoporous TiO2 layer on a fluorine-doped tin oxide (FTO) glass substrate, redox electrolytes, and a counter electrode. In this study, phosphor is introduced into the TiO2-layer electrode in a DSSC. By a conversion luminescence, YAG:Ce3+ phosphor improves light harvesting and increases the photocurrent production. Using a TiO2 electrode containing 5.00wt% mixed YAG:Ce3+, the light-to-electric energy conversion efficiency of the DSSC reaches 6.24%, which is higher by a factor of 1.52 than that of a DSSC without YAG:Ce3+.