Optical and luminescence properties of Nd3+ ions in K-Ba-Al-phosphate and fluorophosphate glasses

Phosphate (PKBAN: P2O5 +K2OBaO+Al2O3 +Nd2O3) and fluorophosphate (PKBFAN: P2O5 + K2O + BaO + BaF2 + Al2O3 + Nd2O3 and PKBAFN: P2O5 + K2O + BaO + Al2O3 + AlF3 + Nd2O3) glasses were prepared with three concentrations (0.1, 1.0 and 2.0 mol%) of Nd3+, ions and their detailed luminescence properties have been investigated. Absorption spectra for 1.0 mol% of Nd3+-doped glasses have been analysed using Judd-Ofelt (JO) theory. The observed bands in absorption spectra from ground to excited states are assigned and analysed with the parameterized free-ion Hamiltonian model. The JO parameters have been used to predict radiative properties for F-4(3/2) -> I-4(J) (J = 15/2, 13/2, 11/2 and 9/2) transitions of Nd3+ ions in these glasses. The Inokuti-Hirayama model has been applied to the non-exponential behaviour of the decay profiles to investigate the mechanism involved in the energy transfer between the donors and acceptors.