Control of spectroscopic fluorescence parameters of Nd3+ ions as a function of concentration in a SiO2–Na2O–Al2O3–B2O3 glass system

Experimental evidence of spectroscopic parameter control was observed in Nd3+ ions embedded in a SiO2–Na2O–Al2O3–B2O3 glass system. The parameters Ω2,4,6 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 4F3/2 → 4I11/2 transition lifetime of Nd3+.