A. BORGHESI

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We report the results of steady-state photoinduced absorption experiments on PDA-4BCMU grown on silica substrate. We observe three photoinduced absorption bands at 0.82, 0.95, and 1.39 eV whose relaxation dynamics are identical for the two low-energy peaks but different for the 1.39-eV band. On the basis of the spectra, the pump intensity,...

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We report the optical properties of a highly oriented form of poly[1,6-di(N-carbazolyl)-2,4-hexadiyne] grown by molecular epitaxy on a crystalline substrate of potassium acid phthalate. The real and imaginary parts of the refractive index are deduced from both transmittance and near-normal incidence absolute reflectance. (C) 1997 Elsevier Science Ltd.

We report the photoinduced absorption spectra of an oriented form of poly@1,6- di(N-carbazolyl!-2,4-hexadiyne# ~polyDCHD! grown by molecular epitaxy. The polarized absorption spectra of the polyDCHD point out the high quality of the sample and the very high degree of alignment of the polydiacetylene chains. The millisecond photoinduced...

With the aim of determining the importance of the molecular and supramolecular organization on the excited states of polydiacetylenes, we have studied the photoinduced absorption spectra of the red form of poly@1,6- bis~3,6-didodecyl-N-carbazolyl!-2,4-hexadiyne# ~polyDCHD-S! and the results compared with those of the blue form of the same...

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In this paper we report the optical absorption and photoinduced absorption spectra of poly(1-N-carbazolyl-penta-1,3 diyne-5-acetoxy) and of poly(1-N-carbazolyl-penta-1,3-diyne-5-ol) and their relation to temperature, excitation intensity, and frequency of the pump-probe cycles. Preliminary data on an oligomeric sample are also discussed. All...

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