Abstract
The sample of Eu 3+-doped TiO 2 (Eu 3+/TiO 2) nanocrystals is synthesized by the sol–gel method with hydrothermal treatment. Raman and photoluminescence (PL) spectra of the sample have been investigated under high pressure up to 18 GPa using a diamond anvil cell. At ambient pressure, a strong PL signal associated with the 5D 0→ 7F J (J=0,1,2,3,4) transition of Eu 3+ under the excitation wavelength at 514.5 nm is observed. The emission peaks red shift slightly and the intensity decreases with the increase of pressure, while the intensity ratio between 5D 0→ 7F 2 and 5D 0→ 7F 1 decreases dramatically. A phase transition is observed at 8.2–10.6 GPa by the Raman spectra analysis. Reducing of the intensity ratio between 5D 0→ 7F 2 and 5D 0→ 7F 1 value indicates the rising of the site symmetry and the weakening of the covalency of Eu–O bond.
Sign-in/Register to access full text options 
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.
