Influence of local phonon energy on quantum efficiency of Tb3＋-Yb3＋co-doped glass ceramics containing fluoride nanocrystals

• Published in: Journal of rare earths Vol. 33; no. 5; pp. 524 - 528
• Main Author: 王慧云 叶松 刘天华 李松 胡荣璇 王德平
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2015
• Subjects: crystalline phase; down conversion luminescence; glass ceramics; quantum efficiency; rare earths; 共掺杂; 含氟化物; 声子能量; 外量子效率; 时间分辨光谱; 玻璃陶瓷; 纳米晶体; 铽; down conversion luminescence; quantum efficiency; crystalline phase; glass ceramics; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(14)60451-8

The Tb3＋single-doped and Tb3＋-Yb3＋co-doped glass ceramics with the precipitation of CaF2, CaF2-SrF2 solid state solu-tion and SrF2 nanocrystals were designed and prepared by taking different amounts of CaF2 and SrF2 as the starting fluorides to inves-tigate the influence of the crystalline phase on the total quantum efficiency. The formation of the fluoride nanocrystals and the incor-poration of the doped rare earth ions into the fluoride nanocrystals were proved by the XRD measurement. The energy transfer from Tb3＋to Yb3＋was studied by the steady and time resolved spectra. The total internal quantum efficiencies were calculated based on the measured Tb3＋lifetime, which was about 10.5%improved in the SrF2 nanocrystals precipitated glass ceramics compared with that in the CaF2 nanocrystals precipitated glass ceramics mainly due to the lower phonon energy environment. Meanwhile, the total external quantum efficiencies were evaluated with the integrating sphere measurement system, which were 18.6%, 19.3%and 24.4%, respec-tively, for the CaF2, CaF2-SrF2 and SrF2 nanocrystals precipitated glass ceramics. Additionally, obvious difference between the calcu-lated total internal quantum efficiency and the measured total external quantum efficiency was also discussed.