Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9586229 | Journal of Luminescence | 2005 | 4 Pages |
Abstract
In order to clarify the origin of the 2.4 eV luminescence band in SrTiO3, as-grown and annealed SrTiO3 single crystals are irradiated with a continuous-wave ultraviolet laser light (λ=325nm) in different atmospheres at room temperature. Under the laser light irradiation in a vacuum, the 2.4 eV luminescence band grows with increasing irradiation time, while it returns to the original weak-luminescence state under the same laser light irradiation in oxygen gas. The excitation-intensity, temperature and time dependences of the photoluminescence spectra are also measured for the crystals. All the results indicate that the 2.4 eV luminescence band arises not from intrinsic self-trapped excitons but from extrinsic excitons trapped around oxygen defects. Near-band-edge emissions have been observed, for the first time, at 3.2 and 2.9 eV under intense excitation.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Shosuke Mochizuki, Seiko Minami, Fumito Fujishiro,