Abstract
Frequency upconversion (UC) luminescence via cooperative energy transfer (CET) process between pairs of Yb3+ and Tb3+ ions was investigated in Tb3+:Yb3+:Y2SiO5 crystalline ceramic powders prepared by combustion synthesis. Surface morphology and structure of the powders were investigated by scanning electronic microscopy and X-ray powder diffraction. Photoluminescence experiments were performed in Tb3+-singly doped samples using ultraviolet light (λ=255nm) and in Tb3+:Yb3+ co-doped samples using a near-infrared (NIR) diode laser (λ=975nm). Upon excitation with the NIR diode laser, UC luminescence with an intense emission band centered at ~549nm, corresponding to the 4f intraband 5D4→7F5 transition of Tb3+, along with less intense emission bands at ~490, ~590 and ~620nm, corresponding to other 5D4→7FJ transitions, was detected. The CET rate was estimated by analyzing the dynamics of UC luminescence with rate equations model of the electronic populations.
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.
