Design novel, flexible, and wide-scale CUT-OFF laser filters of Eosin Yellow dye/PVA polymeric composite films: Enhance the electrical conductivity and dielectric properties of PVA

The basic component of optoelectronics technology is the optical filter, particularly the laser cut-off filter. Within this study, casting technique used to prepare polymeric composite film of (Eosin Yellow dye doped poly(vinyl alcohol) (EY/PVA)) for optical filter. This research has been performed on the XRD scan, UV-Vis-NIR and electrical spectroscopic analysis of EY/PVA films. XRD histogram shows reduction of composite films crystallinity. The transmittance of the films reduced as the dye content increases. A significant reduction in the composite's bandgap with Eosin Y doping is observed owing to the interactions between the functional group of the dye molecule and the hydroxide group in the PVA polymer matrix. Higher content of EY/PVA films (10 and 25) wt% can completely block incident light from 200 nm to 630 nm, which emphasizes the composite's strong potential as an effective optical filter. The optical limiting for EY/PVA films was tested with He-Ne laser beam source at the wavelength of 632.8 nm. It demonstrated the best possible optical limit behavior at high dyes content. The frequency dependence was evaluated on the AC electrical conductivity, dielectric constant, and dielectric loss were analyzed. The studied showed an improvement of the electrical conductivity and dielectric properties with increasing the EY-doping. The samples are ideal for the use of optical limits in CUT-OFF selective laser filters, solar cell, and variety of applications in industrial, electronics, pharmaceutical, medical, and related industries.applications.