Study on the optical properties of polyvinyl alcohol doped sodium fluoride polymer electrolyte films

In the present work, pure polyvinyl alcohol (PVA) and PVA doped with sodium fluoride (NaF) polymer electrolyte films with different weight percent ratios were prepared by solution casting method. The effect of NaF concentration on the optical properties of (PVA-NaF) films has been investigated using UV-Vis Spectrophotometer in the wavelength range (200-800 nm). The optical constants like absorption spectra, transmission spectra, refractive index, extinction coefficient, real and imaginary parts of the dielectric constant and optical band gaps are investigated. It was found that the optical energy band gap is decreased upon the increase in NaF salt concentration which is contrary to the variation of conductance. The experimental results show that the optical constants showed clear changes with increasing the doping concentrations.