1 December 1997 Two-photon absorption spectra of luminescent conducting polymers measured over wide spectral range
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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) 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. In the case of PPA-DBO and PPV-DOO, TPA peaks were coincident with dispersion in the nonlinear refractive indices as detected by reduced aperture Z scan. In all three polymers this peak occurs at approximately 1.3 the bandgap energy. The excitonic nature of the excited electronic states in PPA-DBO is indicated by the lack of a TPA band at or near the 1Bu exciton position. Saturation was observed in the nonlinear index of refraction near spectral peaks, as well as an apparent reverse Kramers- Kronig effect.
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Ron K. Meyer, Ron K. Meyer, Martin Liess, Martin Liess, Robert E. Benner, Robert E. Benner, Werner Gellermann, Werner Gellermann, Z. Valy Vardeny, Z. Valy Vardeny, Masanori Ozaki, Masanori Ozaki, Katsumi Yoshino, Katsumi Yoshino, Yi Wei Ding, Yi Wei Ding, Thomas J. Barton, Thomas J. Barton, } "Two-photon absorption spectra of luminescent conducting polymers measured over wide spectral range", Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); doi: 10.1117/12.279279; https://doi.org/10.1117/12.279279

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