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<p>PVA (Polyvinyl alcohol) and PVP (polyvinyl pyrolidone) blend films filled with different concentrations of Cr (0.16 to 3.125 wt%) were prepared by the solution casting technique. X-ray diffraction patterns of Cr-doped PVA-PVP films exhibit a diffraction peak at ~ 19.83° with a (1 0 1) orientation, indicating a semicrystalline nature. The increase in Cr doping concentration in PVA-PVP films exhibits an amorphous nature. The pore-free surface morphology of the films shows an agglomeration due to the Vander Waals force between the Cr<sup>3+</sup> ions and the PVA-PVP host matrix. A shift in the absorption edge towards longer wavelengths results in a reduction of the optical band gap from 3.68 to 3.44&#xa0;eV. The reduction of the optical band gap with increased Cr content in PVA-PVP film was attributed to the introduction of defect states and localized energy levels in the band structure, increased disorder and band tailing, and enhanced charge transfer interactions. Wemple DiDomenico and Sellmeier’s single oscillator models were used to determine the optical dispersion parameters. The linear, nonlinear optical dispersion parameters, and optoelectrical parameters were enhanced due to the Cr dopant in PVA–PVP films.</p>

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Investigations on structural, linear, nonlinear, and optoelectrical properties of PVA-PVP: Cr blend films for optical device applications

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Ramya Mandala,
  • Rajesh Kumar Borra

摘要

PVA (Polyvinyl alcohol) and PVP (polyvinyl pyrolidone) blend films filled with different concentrations of Cr (0.16 to 3.125 wt%) were prepared by the solution casting technique. X-ray diffraction patterns of Cr-doped PVA-PVP films exhibit a diffraction peak at ~ 19.83° with a (1 0 1) orientation, indicating a semicrystalline nature. The increase in Cr doping concentration in PVA-PVP films exhibits an amorphous nature. The pore-free surface morphology of the films shows an agglomeration due to the Vander Waals force between the Cr3+ ions and the PVA-PVP host matrix. A shift in the absorption edge towards longer wavelengths results in a reduction of the optical band gap from 3.68 to 3.44 eV. The reduction of the optical band gap with increased Cr content in PVA-PVP film was attributed to the introduction of defect states and localized energy levels in the band structure, increased disorder and band tailing, and enhanced charge transfer interactions. Wemple DiDomenico and Sellmeier’s single oscillator models were used to determine the optical dispersion parameters. The linear, nonlinear optical dispersion parameters, and optoelectrical parameters were enhanced due to the Cr dopant in PVA–PVP films.