Novel ternary nanocomposite films composed of polyvinyl chloride (PVC) integrated with nano Mn 0.95 Mg 0.05 WO 4 and polyaniline (PANI) at diverse concentrations (0–4 wt%) were successfully produced using co-precipitation and solution casting procedures. The combined incorporation of semiconducting tungstate and conductive polymer into the PVC matrix produces significant improvements in optical and dielectric properties. X-ray diffraction (XRD) examination verifies the successful integration of crystalline Mn 0.95 Mg 0.05 WO 4 fillers into the amorphous PVC matrix. The nanocomposites demonstrate adjustable optical characteristics, with direct band gaps consistently decreased from 5.07 eV (PVC) to 3.07 eV, alongside notable increases in refractive index and extinction coefficient. Photoluminescence investigations reveal excitation-dependent emission tunability spanning blue-violet to orange-white spectral areas, with Commission Internationale de l’Éclairage (CIE) coordinates validating the tunable color output. Dielectric studies indicate that the ternary system containing 3 wt% PANI attains peak performance, demonstrating significantly improved dielectric constant and AC conductivity alongside diminished dielectric loss. Electric modulus analysis verifies non-Debye relaxation phenomena regulated by hopping conduction pathways. The significant enhancement in nonlinear optical properties further emphasizes the promise of these nanocomposites. The aggregated findings indicate that PVC/Mn 0.95 Mg 0.05 WO 4 /PANI ternary nanocomposites are potential multifunctional materials for flexible energy storage devices, adjustable optical filters, UV-blocking coatings, and photonic applications.
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