Experimental evidence of spectroscopic parameter control was observed in Nd3+ ions embedded in a SiO2-Na2O-Al2O3-B2O3 glass system. The parameters Omega(2,4,6) and others were determined by the Judd-Ofelt theory. It was found that these parameters were strongly dependent on Nd3+ concentration, indicating a ligand field change. This Letter will present and discuss possible mechanisms responsible for changes in the Judd-Ofelt parameters. Furthermore, non-radiative energy transfer mechanisms such as energy migration, cross relaxation and losses from networked phonons and OH radicals, will be proposed to explain the observed decrease in F-4(3/2) -> I-4(11/2) transition lifetime of Nd3+. (C) 2011 Elsevier B.V. All rights reserved.