Dye-sensitized solar cells (DSSCs) are composed of a dye-adsorbed nanoporous TiO₂ layer on a fluorine-doped tin oxide (FTO) glass substrate, redox electrolytes, and a counter electrode. The phosphor is introduced into the TiO₂ layer electrode in a DSSC. The content of phosphor-containing in the TiO₂ paste is varied from 0.25 to 5.00 wt %. The synthesized TiO₂ paste is deposited on FTO glass using a doctor blade. The conversion luminescence process of phosphor, increases both the light harvesting efficiency and the photocurrent. Using the 0.5 wt % Ba₃Si₆O₁₂N₂:Eu²⁺-containing TiO₂ electrode, the light-to-electric-energy conversion efficiency of the DSSCs reaches 4.61% under simulated solar light irradiation at 100 mW/cm^-2, which is an increase by a factor of 1.41 compared with that of the DSSCs without Ba₃Si₆O₁₂N₂:Eu²⁺.