Optical study of GeO2–PbO–PbF2 oxyfluoride glass singly doped with Pr3+, Nd3+, Sm3+ and Eu3+

2005

Abstract Glasses with composition 50GeO 2 –(50 −  x )PbO–5PbF 2 – x LnF 3 (Ln = Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ ) were synthesised in the bulk form. The content of PbF 2 was constant and amounted to 5 mol% whereas, the concentration of luminescent ions was 0.2 and 2 mol%. Spectroscopic properties (absorption, emission) of optically active ions were studied at room temperature. Oscillator strengths have been used to calculate phenomenological intensity parameters Ω 2,4,6 . Radiative transition probabilities as well as branching ratios and radiative lifetimes of luminescent levels were estimated. Lifetimes and the fluorescence dynamics were studied as a function of concentration. The Judd–Ofelt…