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We present a summary of our recent results on the electrical and mechanical properties of fibers made from poly(2,5-dimethoxy-p-phenylene vinylene), PDMPV and poly(2,5-thienylene vinylene), PTV, using the precursor polymer methodology, and from polyaniline, PANI, using the method of processing as polyblends with poly-(p-phenylene terephthalamide), PPTA, from sulfuric acid. The solubility of both PANI and PPTA in H2SO4 presents a unique opportunity for co-dissolving and blending PANI and PPTA to exploit the excellent mechanical properties of PPTA and the electrical conductivity of PANI; we summarize the electrical and mechanical properties of such composite fibers. For PDMPV and PTV fibers, we find a strong correlation between the conductivity and the tensile strength (and/or modulus), and we show from basic theoretical concepts that this relationship is an intrinsic feature of conducting polymers.

Third-harmonic generation (THG) measurements have been made on poly(p-phenylenevinylene) thin films. The third-order susceptibility was evaluated to be x(3)= 7.8 × 10−12esuat 1.85μm wavelength.

The authors have fabricated organic electroluminescent (EL) diodes with a microcavity structure designed to have a resonance wavelength of 500 nm, by using a metal reflector and various dielectric reflectors. The emission intensity (spectral power density) is enhanced by a factor of 5 compared to that of an EL diode without a cavity, and narrow spectral width of 8 nm was achieved in blue green emission.

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