Effect of γ-radiations on the optoelectrical parameters of coumarin-poly vinyl alcohol composite thin films

Abstract

This work aims to study the effect of γ-radiations on the optoelectrical parameters of coumarin-poly vinyl alcohol composite thin films at room temperature prepared by solution casting method. For these polymer composite films, the various parameters calculated from the refractive index and extinction coefficient were obtained from transmittance and reflectance spectra. The effect of radiations on the optical band gap, Urbach energy, tangent loss factor, volume and surface energy loss functions were studied. The effect of γ-radiations on the optoelectrical parameters like high-frequency dielectric constant, optical carrier concentration, relaxation time, optical mobility and optical resistivity derived from Drude theory were also discussed. Moreover, other parameters of interest under the investigation were optical conductivity, electronic polarizability, optical electronegativity, nonlinear optical susceptibility, optical, and chemical hardness. The impacts of γ-radiations on dispersion parameters like oscillator energy, dispersion energy, oscillator wavelength and oscillator strength were also studied by using Wemple-DiDomeenico single oscillator model.