Polarized Pressure Dependence Of The Anisotropic Dielectric Functions Of Highly Oriented Poly(P-Phenylene Vinylene)

In this work, we combined an experimental technique and a detailed data analysis to investigate the
influence of an applied pressure on the anisotropic dielectric functions of highly oriented
polyp-phenylene vinylene PPV. The dielectric constants were derived from polarized reflectance
spectra recorded through a diamond anvil cell up to 50 kbar. The presence of the diamond anvils
strongly affects measured spectra requiring the development in an optical model able to take all
spurious effects into account. A parametric procedure was then applied to derive the complex
dielectric constants for both polarizations as a function of pressure. A detailed analysis of their
pressure dependence allows addressing the role of intermolecular interactions and electron-phonon
coupling in highly oriented PPV.