LAUSR

The present study reports the synthesis of composite films comprising PEO/Na2PtCl6 complex and their deposition onto fused silica substrates via the dip‐coating method. Chemical, crystallographic, and thermal characterizations are carried out to confirm the incorporation of Na2PtCl6 and PEO matrix into the films. The transmittance of the PEO film is initially high and decreases subsquently with an increase in Na2PtCl6 content. The optical band‐gap energy of the composite films decreases exponentially from 4.62 to 3.79 eV with the increase in Na2PtCl6 content. Furthermore, in the normal dispersion region, the refractive index of the PEO film decreases from 2.00 to 1.670 as the wavelength increases from 400 to 700 nm. The refractive index values increase with an increase in the concentration of Na2PtCl6 in the PEO film up to 8 wt.%. The incorporation of Na2PtCl6 into the PEO matrix increases the electrical conductivity because of the combined enhancement of the PEO conductivity and increase i Na2PtCl6. These findings suggest that PEO/Na2PtCl6 complex composite films have potential applications in UV‐shielding and optoelectronic devices.