Influence of the thickness and thermal treatment on absorbance, emission and surface morphology properties of self-assembly PPV films

In this report we studied the effect of the thickness and thermal conversion of poly(p-phenylene vinylene) (PPV) films on the optical properties. Self-assembly PPV films were processed with 5 and 75 layers from PPV precursor polymer and dodecylbenzenesulfonate. The thermal conversion treatment was performed at 110 /spl deg/C and 230 /spl deg/C. The emission spectra show a red shift when the film thickness increases; demonstrating the influence of substrate/film interface. Strong anisotropy is observed with 5 layer films (0.57), this value decrease to 0.36 with 75 layers and converted at 230 /spl deg/C. The film surface topology was available using Atomic Force Microscopy aimed at identifying morphology changes in SA-PPV films.