Synthesis and optical properties of antimony oxide glasses doped with holmium trioxide

Holmium doped lithium-antimony-lead borate glasses having 1 mol% AgNO₃ with composition 50B₂O₃-20PbO-25Sb₂O₃-5Li₂O have been prepared using single step melt quenching technique. The XRD spectrum confirms amorphous nature of glasses. The optical absorbance studies were carried out on these glasses. The optical direct band gap energies were found to be in the range of 3.10 eV to 3.31 eV and indirect band gap energies were found to be in the range of 2.28 eV to 3.00 eV. The refractive indexes have been calculated by using Lorentz-Lorenz formula and the calculated values in the range of 2.31 to 2.37.