Figure 5.

External quantum efficiencies of Dy${}^{3+}$ (0.23 at.%) and Tb${}^{3+}$ (2.61 at.%) single-doped as well as Dy${}^{3+}$/Tb${}^{3+}$ (0.22 at.%/2.61 at.%) double-doped BaB glasses.