JuddOfelt analysis and improvement of thermal and optical properties of tellurite glasses by adding P2O5

Er3 and Er3/Yb3 co-doped tellurite glasses, suitable for developing optical fiber laser and amplifier, have been elaborated from the conventional melt-quenching method. Results of differential scanning calorimetry (DSC) measurements indicate a good thermal stability of tellurite glasses. The DSC measurements show an improvement of thermal stability of glass hosts after adding P2O5. Absorption spectrum from near infrared to visible was obtained and the JuddOfelt (JO) intensity parameters (Ω2, Ω4, and Ω6) were determined. Spontaneous emission probabilities of some relevant transitions, branching ratio, and radiative lifetimes of several excited states of Er3 have been predicted using intensity JO parameters. Absorption cross-section and calculated emission cross-section, using the McCumber method, for the 4I13/2→4I15/2 transition, were determined and compared for the doped and co-doped glasses. Energy transfer (ET) and effect of changing concentration of P2O 5 and Yb3 ions on spectroscopic properties were investigated. It was found that the addition of P2O5 can increase the symmetry of the Er3 ion. As a consequence, PL lifetime becomes more longer. The spectroscopic properties and the efficient infrared luminescence indicate that Er3 doped TeO2ZnONa 2OEr2O3 (TZNE) is a promising laser and amplifier materials and may be a potentially useful material for developing upconversion fiber optical devices. © 2010 Elsevier B.V. All rights reserved.