Optical, Thermal and Fluorescence Properties of Spin-Coated Solid Polymer Electrolyte Films

Polyethylene oxide (PEO) −Polyvinylpyrrolidone (PVP) blended (50/50) filled with different concentration of Co2+ ions were prepared by spin-coating method. The films were characterized by UV-Absorption, TG/DTA, SEM and Fluorescence techniques. From the UV-Vis absorption results shows that optical band gap found decreases with increase cobalt ions content, this indicates that there are electrons inter band transition taken place. The thermal stability of the polymer blend has improved after filling CoCl2 increases; this indicates that the filler acts as a plasticizer. In particular, remarkable enhancement of the fluorescence properties of CoCl2 doped polymer blend was observed in different excitation light from 350 to 476 nm. The linear optical constants such as the extinction coefficient (k), refractive index (n), real (ɛr) and imaginary (ɛi) dielectric constant, optical conductivity (σopt) are calculated. The optical properties i.e., good photostability and larger stokes shift suggesting, in order to evaluate their potentialities for their use in electrochemical display device applications.