Correlation of Photocatalysis and Photoluminescence Effect in Relation to the Surface Properties of TiO₂:Tb Thin Films

Figure 6

The scheme of processes proceeding at the TiO₂:Tb surface with rutile structure. Designations: 𝐸_𝑐, 𝐸_𝑣, energy of the bottom edge of the conduction band and the top of the valence band, respectively; e⁻, electron; h⁺, hole; O₂, oxygen; O₂^•, oxygen radical; H₂O, water; H⁺, hydrogen; OH⁻, hydroxide group; OH^•, hydroxide radical; (ads), surface adsorption.