Optical properties of 60B_2O_3-(40-x) PbO-xMCl_2 and 50 B_2O_3-(50-x) PbO-xMCl_2 (M = Pb, Cd) glasses

摘要

Optical absorption and transmittance spectra of 60B_2O_3-(40-x)PbO-xMCl_2 and 50B_2O_3-(50-x) PbO-xMCl_2 (M = Pb, Cd) (10 <=x < =20) glasses of varying composition were recorded In the UV-visible region. Various optical parameters such as optical energy gap (E(opt)), Urbach energy (E_e), refractive index (n_0), optical dielectric constant (epsilon(propro.to)), and ratio of carrier concentration to the effective mass (N/m~*) were determined. The variation of optical energy gap with increase in the concentration of PbCI_2 or CdCl_2 is discussed.