Abstract
Novel oxyfluoride glass ceramics based on Yb3+-doped TeO2–Li2O–WO3–ErF3 (TWLE) were prepared using the two-stage heat-treatment method. The structural characterisation of these materials with X-ray diffraction indicated that crystalline phases of LiYbErF4 nanocrystals grew in the glass ceramics. Upon excitation with a 980nm laser diode the Yb3+ doped (2mol%) TWLE glass-ceramic produced intense blue emission at 487nm, weak green emission at 525nm and 550nm, and red emission at 650nm at room temperature. The mechanism of the blue emission, which is attributed to cooperative upconversion from pairs of excited Yb3+ ions to ground-state Er3+ ions, and the weak red and green emissions, which are attributed to energy transfer from Yb3+ to Er3+ ions, were investigated. The results of a pump-power dependence measurement suggested that the blue cooperative emission is a two-photon process. A rate equation was used to describe the cooperative energy-transfer process among the donor and acceptor ions. The observed results were compared to the behavior of another glass materials that exhibits blue cooperative emission, revealing the considerable advantage of TWLE:2Yb glass ceramics for optical devices.
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.
