Time-resolved studies of two-photon absorption processes in poly(p-phenylenevinylene)s

Titelangaben

Lemmer, Ulrich ; Rischer, R. ; Feldmann, J. ; Mahrt, R. F. ; Yang, Ji-ping ; Greiner, Andreas ; Bässler, Heinz ; Göbel, E. O. ; Heesel, H. ; Kurz, H.:
Time-resolved studies of two-photon absorption processes in poly(p-phenylenevinylene)s.
In: Chemical Physics Letters. Bd. 203 (1993) Heft 1 . - S. 28-32.
ISSN 1873-4448
DOI: https://doi.org/10.1016/0009-2614(93)89304-Z

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Abstract

Transient absorption spectroscopy and two-photon fluorescence techniques were used to study the nonresonant optical nonlinearities in poly(p-phenylenevinylene) (PPV) and its phenyl substituted derivative (PPPV). Strong two-photon absorption with a coefficient beta in the range of 5 cm/GW was found. The temporal behavior of the two-photon absorption process in PPV and PPPV, however, is significantly different, which is attributed to the different morphology of the polymer samples. The two-photon resonance lies energetically well above the first excited state in