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Proceedings Paper

Cooperative radiation and stimulated emission at high excitation densities in poly(para-phenylene)-type ladder polymer
Author(s): Gerald Kranzelbinder; Wilhelm Graupner; Klaus Muellen; Ullrich Scherf; Guenther Leising
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Paper Abstract

We have studied the radiative recombination processes in poly (para-phenylene)-type ladderpolymer films using ultrafast spectroscopy techniques at excitation densities up to approximately 5 X 1020 photons/cm3 per pulse. In addition to the vibronic manifold of singlet exciton emission the photoluminescence spectrum at such elevated conditions is characterized by an optical transition, which is not present at low pump fluence. This spectral new component is identified as biexcitonic radiative recombination, an assignment that is supported by the hyperlinearity of its total emission as a function of pump intensities and the kinetics revealing a thermal equilibrium state between excitonic and biexcitonic populations. The biexciton binding energy is evaluated to Eb,xx equals 120 meV. Stimulated emission in the spectral blue region is investigated by femtosecond pump and probe experiments.

Paper Details

Date Published: 1 December 1997
PDF: 9 pages
Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); doi: 10.1117/12.284151
Show Author Affiliations
Gerald Kranzelbinder, Technische Univ. Graz (Austria)
Wilhelm Graupner, Technische Univ. Graz (Austria)
Klaus Muellen, Max-Planck-Institut fuer Polymerforschung (Germany)
Ullrich Scherf, Max-Planck-Institut fuer Polymerforschung (Germany)
Guenther Leising, Technische Univ. Graz (Austria)

Published in SPIE Proceedings Vol. 3145:
Optical Probes of Conjugated Polymers
Z. Valy Vardeny; Lewis J. Rothberg, Editor(s)

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