Influence of Yb 3+ and Ce 3+ codoping on fluorescence characteristics of Er 3+-doped fluoride glass under 980 nm excitation
Fluorescence characteristics of Yb 3+:Ce 3+:Er 3+-codoped fluoride glasses is reported. Yb 3+ codoping improved the excitation efficiency at 980 nm pumping and Ce 3+ codoping improved the branching ratio of the Er 3+ 4I 11/2- 4I 13/2 transition level, resulting in an enhancement in the fluorescence quantum yield at 1550 nm. The energy transfer dynamics of the Yb 3+:Ce 3+:Er 3+-codoped fluoride glass was also analyzed based on a rate equation model. The separately measured energy transfer rates between Yb 3+ and Er 3+, and between Er 3+ and Ce 3+ agreed to some extent with the theoretical simulation based on the rate equation model at a lower Yb 3+ concentration (<0.5 mol%).