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Effective stimulated emission and excited-state absorption cross-section spectra of para-phenylene-ethynylene polymers

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Abstract

The effective stimulated emission cross-section spectra, σem,eff(λ), the stimulated emission cross-section spectra, σem(λ), and the excited-state absorption cross-section spectra, σex(λ)=σem(λ)−σem,eff(λ), of the conjugated polymers poly(2,5-dioctadecyloxy-paraphenylene-ethynylene-co-2,5-thienyl) (OPT) and poly(2,5-dioctadecyloxy-paraphenylene-ethynylene-co-2,5-pyridinyl) (OPP) in tetrahydrofuran are determined in the fluorescence region. σem,eff(λ) determined by a fluorescence amplification technique is found to be small compared to σem(λ) indicating that σex(λ) is nearly as large as σem(λ). The laser excitation to the wide inhomogeneously broadened S1-absorption band leads to the formation of spectrally structured inhomogeneously broadened lattice relaxed exciton conformations extending on average over two monomer units which are thought to be responsible for upper-to-lower-state stimulated emission and lower-to-upper-state (excited-state) absorption.

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Authors and Affiliations

  1. Institut II – Experimentelle und Angewandte Physik, Universita¨t Regensburg, D-93040, Regensburg, Germany

    W. HOLZER, A. PENZKOFER & S.-H. GONG

  2. Department of Pure and Applied Physics, University of Dublin, Trinity College, Dublin 2, Republic of Ireland

    W. J. BLAU & A. P. DAVEY

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  1. W. HOLZER
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  2. A. PENZKOFER
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  3. S.-H. GONG
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  4. W. J. BLAU
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  5. A. P. DAVEY
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HOLZER, W., PENZKOFER, A., GONG, SH. et al. Effective stimulated emission and excited-state absorption cross-section spectra of para-phenylene-ethynylene polymers. Optical and Quantum Electronics 30, 1–14 (1998). https://doi.org/10.1023/A:1006969006644

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