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Determination of the two-photon absorption spectrum of a soluble polythiophene

✍ Scribed by Nicola Pfeffer; Paul Raimond; Fabrice Charra; Jean-Michel Nunzi

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 573 KB
Volume: 201
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)85083-z

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✦ Synopsis

The two-photon absorption spectrum of the soluble conjugated polymer poly(3-octylthiophene)

is measured in the visible range using the picosecond Kerr ellipsometry technique. The largest two-photon absorption feature peaks at 3.5 eV, which is 0.6 eV above the one-photon absorption peak. It has 0.27 eV half-width at half-maximum and 0.27 cm/GW magnitude in a 25 g/P solution. The average value of the associated transition dipole moment is 18 D. A weaker two-photon feature with 7 D average dipole moment which parallels the linear absorption spectrum is observed, it may be associated with some disorder-induced local non-centrosymmetry

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