Conversion reaction of a polysulfonium precursor into poly(p- phenylenevinylene) films studied by ellipsometry

摘要

Poly(p-phenylenevinylene) (PPV) and derivatives have been extensively investigated as active layers in light-emitting devices (LEDs) mainly because of a wide range of emission colors and ease of processing. The precursor route is the commonly used method of preparing PPV films. For this, a water-soluble precursor (poly-p-xylylidene tetrahydrothiophenium chloride, PTHT) is used, and flexible PPV films are obtained after thermal conversion of PTHT films. The present study is focused on the optical properties of PTHT and PPV films on Au-coated substrates as measured by spectroscopic ellipsometry (SE). Fourier transform infrared spectroscopy (FTIR) was used to verify structural differences in the polymer chain due to the presence of C = C (increase of conjugation) and C=O (degradation) groups.