Structural and optical studies of Pr³⁺, Nd³⁺, Er³⁺and Eu³⁺ions in tellurite based oxyfluoride, TeO₂-LiF, glass

Tellurite based oxyfluoride glass, [70 mol% TeO 2 , 30 mol% LiF] 0.9 /[LnO] 0.1 where Ln = Pr 3+ , Nd 3+ , Er 3+ and Eu 3+ ions, were prepared. The Judd-Ofelt parameters Ω λ (λ = 2, 4, 6) and radiative parameters, viz, the total radiative transition probability ( A T ), radiative lifetimes (τ R ) the branching ratio (β R ) and the stimulated emission cross sections (σ p ), for the respective excited states of Pr 3+ , Nd 3+ and Er 3+ ions were evaluated and compared with reported values. The network structure of these glasses has been established from FT-IR spectra and the phonon side band spectrum of Eu 3+ ions.