Abstract
In order to clarify the origin of the 2.4 eV luminescence band in SrTiO 3, as-grown and annealed SrTiO 3 single crystals are irradiated with a continuous-wave ultraviolet laser light ( λ = 325 nm ) 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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
