Abstract: Yb³⁺-doped 60 SiO₂-xBi₂O₃-(30-x)B₂O₃-2K₂O-7Na₂O-1Yb₂O₃(x=0, 5, 10, 15, 20, 25, 30) were prepared. The physical and spectroscopic properties of Yb³⁺doped SiO₂-
Bi₂O₃-B₂O₃ were studied. The refractive index, density of Yb³⁺ doped SiO₂-Bi2O3-B₂O₃ glasses increase with the increase of Bi₂O₃ content, while the T_g, T_f
decrease with the increase of Bi₂O₃ content. The system of 60 SiO₂-15Bi₂O₃-15B₂O₃-2K₂O-7Na₂O-1Yb₂O₃ glass possesses higher asymmetry. This sample exhibits higher peak absorption
cross section(σ_abs) and integrated absorption cross section (Σ_abs):1.97pm² and 5.32×10⁴pm³ respectively. Also this glass has higher spontaneous emission probability(Arad)
1620S^-1, the τ_rad (calculated emission lifetime) is 0.617ms. The measured emission lifetime(τ_f) has strong relations with the
OH^- content in glasses, as the B₂O₃ content increases from 0mol% to 30mol%, the τ_m increases from 0.39 to 0.87ms.

Key words: Yb³⁺-doped, SiO₂-Bi₂O₃-B₂O₃ glasses, physical and spectroscopic properties