Authors: Lili Zhang Jie Xu Yichen Hu Guorong Chen Zhongjian Wang
Publish Date: 2013/06/01
Volume: 28, Issue: 3, Pages: 455-459
Abstract
The Pr3+Yb3+ codoped oxyfluoride glassceramics containing CaF2 nanocrystals were obtained by thermal treatment on the asmade glasses The structure of fluoride nanocrystals was investigated The lightemitting mechanism of Pr3+Yb3+ in the near infrared region was proposed and the fluorescence lifetime and quantum efficiency was calculated The results indicate that the main phase in the oxyfluoride glassceramics is CaF2 nanocrystal sized at 30 nm Energy dispersive spectroscopy EDS and Xray diffraction XRD have proved the incorporation of Pr3+ and Yb3+ into CaF2 nanocrystal lattice Nearinfrared quantum cutting involving Yb3+ 980 nm and 1 015 nm 2F5/2→2 F 7/2 emission has been achieved upon the excitation of the 3 P 0 energy level of Pr3+ at 482 nm The fluorescence lifetime decreases sharply and quantum efficiency increases with increasing Yb3+ concentration and the optimal quantum efficiency reaches 191
Keywords: