Abstract
Preparation of various concentrations of Dy3+ doped borosilicate glasses using melt quenching technique and their optical characterizations are presented. Based on the measured optical spectra, Judd-Ofelt approach is used to determine the optical parameters such as oscillator strengths, optical intensity parameters and transition lifetime. The impact of the total angular momentum on the transition lifetime is theoretically investigated. The lifetime decreases as the angular momentum increases until J = 7/2, for the atomic terms F-6(J), then its value increases at higher values of angular momentum. The same behavior occurs for the H-6(J) states, but longer lifetime starts at J = 11/2 to J = 13/2. The free ion collision strengths and cross sections are evaluated to asses an interpretation of the presented radiative results. The cross sections show a decrease trend with the J-increasing while the collision strengths show the opposite behavior. Calculated data of electric dipole transition probabilities and branching ratio of several transitions of Dy3+ are reported. (C) 2017 Elsevier B.V. All rights reserved.