Electroluminescence of TiO2 film and TiO2:Cu2+ film prepared by the sol-gel method

The electroluminescence (EL) to TiO2 films and TiO2 films doped with CU2+ (TiO2:Cu2+) prepared by the sol-gel method was studied. The EL spectra of anatase-TiO2 film showed a band at about 520 nm and that of rutile-TiO2 film a band at about 570 nm. The EL spectra of TiO2:Cu2+ film showed two bands at about 500 and 600 nm assigned to Cu+ monomer and Cu+ dimer, respectively. The EL spectra of TiO2:Cu2+ films changed remarkably with the crystal structure and electrode potential.