Energy transfer in Pr3+–Yb3+ codoped oxyfluoride glass ceramics

Optical properties and energy transfer of Dy3+-doped transparent oxyfluoride glasses and glass–ceramics

“…Similar results were observed in the fluorescence decays of Tm 3+ -Yb 3+ ions [18], Pr 3+ -Yb 3+ ions [19] and Nd 3+ ions [20] in similar glass-ceramics.…”

“…7(b). In order to give a clear view of the energy transfer microscopic mechanisms involved in the glass, the non-exponential decay curves have been analyzed using the Inokuti-Hirayama (IH) model for dipole-dipole interaction [13,19] …”

“…The value of s G for the present case is taken as 808 ls and is obtained from the single-exponential decay curve of the 0.01 mol% Dy 3+ -doped glass, for which there is no energy transfer processes between Dy 3+ ions. The energy transfer parameter Q G is related to the Dy 3+ ions concentration (C A ) and the donor-acceptor transfer parameter C DA by [19] Q G ¼ 4p 3…”

“…Therefore, the non-exponential decay curves of the glass-ceramic can be fitted to the IH model taking into account the two contributions [19,20] IðtÞ…”

“…This is because, in 1.0 mol% Dy 3+ -doped GCs, more and more Dy 3+ ions enter into fluoride nanocrystals and are separated by shorter distances and hence show a large energy transfer probability leading to reduced average lifetimes [19]. Table 5 presents the IH model fitting parameters of the nonexponential decay curves.…”