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Location of the lowest even parity excited singlet state in poly(p-phenylenevinylene) by two-photon fluorescence spectroscopy

✍ Scribed by C.J. Baker; O.M. Gelsen; D.D.C. Bradley

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 407 KB
Volume: 201
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)85045-p

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✦ Synopsis

We report the two-photon fluorescence excitation spectrum of poly(pphenylenevinylene) over the energy range 1.1-2.0 eV. The onset for two-photon fluorescence excitation is at 1.3 eV with a strong peak near I.475 eV. The peak locates the energy of the lowest even parity excited singlet at 2.95 eV, some 0.5 eV above the lowest dipole-allowed singlet transition (the fundamental x-I* absorption). This energetic ordering of excited states is in agreement with the predictions of theory and is consistent with the strong one-photon fluorescence seen for this polymer.

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