2.0-μm emission and energy transfer of Ho3+/Yb3+ co-doped LiYF4 single crystal excited by 980 nm |
Fluorescence decay curves of LFHY2, LFHY4, LFHY6, LFHY8 at 1019 nm by 940-nm excitation. Inset shows the relationship between energy transfer rate and ion concentration. |