Up-conversion fluorescence: Noncoherent excitation by sunlight

  • Baluschev S
  • Miteva T
  • Yakutkin V
 et al. 
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We demonstrate up-conversion of noncoherent sunlight realized by ultralow excitation intensity. The bimolecular up-conversion process in our systems relies on the presence of a metastable triplet excited state, and thus has dramatically different photophysical characteristics relative to the other known methods for photon up-conversion (two-photon absorption, parametric processes, second harmonic generation, sequential multiphoton absorption, etc.).

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  • S. Baluschev

  • T. Miteva

  • V. Yakutkin

  • G. Nelles

  • A. Yasuda

  • G. Wegner

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