Fluorescence line narrowing spectral studies of Eu3+-doped lead borate glass

A lead borate glass of molar composition 49.5H(3)BO(3)-49.5PbO-1.0Eu(2)O(3) was prepared and studied by broadband and fluorescence line narrowing spectral techniques. Site-selective D-5(0) -> F-7(0.1) emission spectra were obtained under resonant excitation at different wavelengths along the F-7(0) -> D-5(0) transition. These studies have been used to investigate the site-to-site variations in the spectroscopic properties of Eu3+ ions in the lead borate glass at 13 K. The energies of the Stark levels of the F-7(1) multiplets are obtained from the experimental fluorescence line narrowing spectra and crystal-field analysis has been carried out, assuming C-2v orthorhombic symmetry, for each of the excitation energies. The distribution environments and the local structures of Eu3+ ions in lead borate glass are found to be almost similar to calcium diborate glass and lies intermediate between Eu3+-doped sodium borosilicate and lithium fluoroborate glasses. (c) 2005 Elsevier B.V. All rights reserved.