Calculation of Optical Parameters and Investigation of Luminescence Spectra of Dy3+ Doped Boroaluminasilicate Glasses

Dy3+-doped boroaluminasilicate(BAS) glasses with high effective visible fluorescence emission were synthesized. Optical absorption and fluorescence spectra of these glasses have been studied. Using J-O theory, the intensity parameters (×10-20 cm2) Ω2=4.75, Ω4=0.98 and Ω6=2.24 have been evaluated with a reasonable agreement between the measured and calculated f-value. These parameters were used to predict various spectroscopic properties of excited levels of Dy3+ in BAS glasses. The bright yellow emission at 575 nm (4F9/2→6H13/2) has been observed, apart from 4F9/2→6H15/2 (482 nm) and 4F9/2→6H11/2 (662 nm) emission transitions with excitation at 451 nm (6H15/2→4H15/2). Stimulated emission cross-sections of the emission bands have been computed based on the measured Δλ. Concentration quenching will occur when concentration of Dy3+ exceeds 1.0%(mole fraction) and the quenching mechanism involves quadrupole-quadrupole interaction.