Self-trapped exciton emission in crystalline anatase

Biparametric optical sensing of oxygen by titanium dioxide

“…Earlier studies on the visible broadband PL emission of anatase [34][35][36] attributed it to radiative recombination of self-localized excitons (or "self-trapped excitons", in short STEs). Excitons selflocalization occurs frequently in polar semiconductors [37,38] where strong interaction between the exciton and the host lattice induces a lattice relaxation in the close vicinity of the exciton itself.…”

Annealing temperature dependence of ferromagnetism in Co-doped TiO2 nanofibres

“…4(b). The PLs of pure TiO 2 nanofibres are dominated with emission band from 500 to 600 nm, which is assigned to the recombination of self-trapped excitons (STEs) localized within TiO 6 octahedra [17,18]. The STE in our samples originates from band-to-band excitation where the excited electron and the remaining hole create a local deformation of TiO 6 octahedra and thus localize themselves into a state in the energy gap of TiO 2 .…”

Influence of oxygen vacancies on optical properties of anatase TiO2 thin films

“…Anatase TiO 2 exhibits a broad photoluminescence (PL) band peak at 2.3 eV with a large Stokes shift. It is due to the recombination of self-trapped excitons (STE) [2]. The PL decay curve at the peak energy was composed of more than one component, indicating that there are different relaxation processes to the STE state.…”