Figure 9.

Normalized radiative decay curves of Tb${}^{3+}$ in Tb${}^{3+}$ for single- as well as Dy${}^{3+}$/Tb${}^{3+}$ double-doped BaB glasses with varying Tb${}^{3+}$ and Dy${}^{3+}$ contents (all values are in at.%), recorded for the Tb${}^{3+}$-related ${}^5$D${}_4$ to ${}^7$F${}_5$ transition at 545 nm under 375-nm (Tb${}^{3+}$ single-doped glasses) and 455-nm (Dy${}^{3+}$/Tb${}^{3+}$ double-doped glasses) excitations. The solid curves (green) represent the best fit on the basis of the Inokuti–Hirayama model.