A novel method for the conversion of sulfonium precursor into poly(P-phenylene vinylene) (PPV) has been developed. The treatment of the sulfonium precursor with strong acids at room temperature leads to doped PPV. The materials obtained have the same optical properties and slightly higher conductivity in comparison to PPV prepared by pyrolysis of the precursor. Finally, the chemically converted PPV material appears to be of lower-density, therefore the dopants can easily diffuse into the polymer matrix and subsequently enhance the electrical conductivity of the system.