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 ( x 10(-20) cm(2)) Omega(2) = 4.75, Omega(4) = 0.98 and Omega(6) = 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 (F-4(9/2)-> H-6(13/2)) has been observed, apart from F-4(9/2)-> H-6(15/2) (482 nm) and F-4(9/2)-> H-6(11/2)(662 nm) emission transitions, with excitation at 451 nm (H-6(15/2)-> H-4(15/2)). Stimulated emission cross-sections of the emission bands have been computed based on the measured AA. Concentration quenching will occur when concentration of Dy3+ exceeds 1.0% (mole fraction) and the quenching mechanism involves quadrupole-quadrupole interaction.