Abstract
The paper reports results of comparable spectral investigation of thermal treatment effects on luminescent properties of the undoped and rare earth doped lead tungstate crystals. Annealing at 950°C leads to pronounced changes in the emission and excitation spectra of the undoped PbWO4 crystals whereas observed effect of annealing on the spectra of the RE-doped crystals is weak. Decrease of the relative contribution of blue luminescence emission band and changes at the sharp long wavelength edge of the excitation spectra are the most distinctive results of annealing on the spectra of the undoped crystals. Observed changes can be explained by manifestations of two exciton transitions in the corresponded spectra. Two types of exciton luminescence bands arise from the lattice regions with different defects of the crystal structure (e.g., with vacancies in the anion or cation sublattices). Adding of the RE ions decreases content of vacancies in the PWO crystal lattice and improves in such a way thermal stability of spectral properties of the blue luminescence of these crystals.
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.
