Optical and Physical Properties of Bismuth Borate Glasses Doped With Dy³⁺

This study reports on physical and optical properties of Dy³⁺ doped bismuth borate glass. The glasses containing Dy³⁺ in (70-x)B₂O₃:30Bi₂O₃:xDy₂O₃ (where x = 0.0-2.5 mol%) have been prepared by melt-quenching method. In order to understand the role of Dy₂O₃ in these glasses, the density, molar volume and optical spectra were investigated. The results show that molar volume of the glasses increase with the increasing of Dy₂O₃ concentration and consequently generating more non-bridging oxygen (NBOs) into glass matrix. The absorption spectra of Dy³⁺ doped in bismuth borate glass correspond with several bands, which are assigned from the ground state, ⁶H_15/2 to ⁶F_3/2(761 nm), ⁶F_5/2(806 nm), ⁶F_7/2(907 nm), (⁶H_7/2, ⁶F_9/2)(1099 nm), (⁶F_11/2, ⁶H_9/2) (1283 nm) and ⁶H_11/2(1695 nm). Moreover, the optical basicities were also theoretically determined.