1 December 1997 Cooperative radiation and stimulated emission at high excitation densities in poly(para-phenylene)-type ladder polymer
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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.
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Gerald Kranzelbinder, Gerald Kranzelbinder, Wilhelm Graupner, Wilhelm Graupner, Klaus Muellen, Klaus Muellen, Ullrich Scherf, Ullrich Scherf, Guenther Leising, Guenther Leising, } "Cooperative radiation and stimulated emission at high excitation densities in poly(para-phenylene)-type ladder polymer", Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); doi: 10.1117/12.284151; https://doi.org/10.1117/12.284151
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