Abstract
Photoluminescence properties of TiO2 films obtained by the chemical vapor deposition method have been investigated in the wide temperature region. An intense green emission originated from the self-trapped exciton recombination has been observed at low temperatures under UV laser excitation. Cathodoluminescence of the film shows an additional ultraviolet emission band which appears at high acceleration voltages (> 5 kV). Peak energy of this emission (∼3.35 eV) is in a good agreement with the value of the optical energy band gap of TiO2. Both the green and ultraviolet emissions are discussed in terms of linear coupling configuration coordinate model.
