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Two-photon Absorption Spectra Of Luminescent Conducting Polymers

R. K. Meyer, R. Benner, Z. Vardeny, M. Liess, M. Ozaki, K. Yoshino, Y. Ding, T. Barton
Published 1997 · Materials Science

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Abstract We report the two-photon absorption (TPA) spectra of poly(2,5-dibutoxy-p-phenylene acetylene) (PPA-DBO), poly(2,5-dioctyloxy-p-phenylene vinylene) (PPV-DOO), and poly(3-hexylthiophene) (PAT6) in the spectral range extending from 576 nm to 846 nm. Using the Z-scan technique on the polymers in solution, we measured a strong two-photon allowed transition in all three materials which we attribute to the mAg essential state. The mAg in all three polymers occurs at, approximately, 1.2 times the optical bandgap, Eg [E(1Bu)]. The excitonic nature of the Ag-character states is indicated by the lack of a TPA band at or near Eg. Calculated χ(3) spectra, using the mAg state, two additional states above the 1Bu exciton, and a lineshape function to account for chain length distribution, exhibit the same spectral features observed in the TPA spectra.
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