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. 2006 Oct 6;97(14):143903.
doi: 10.1103/PhysRevLett.97.143903. Epub 2006 Oct 4.

Up-conversion fluorescence: noncoherent excitation by sunlight

S Baluschev  1 , T Miteva, V Yakutkin, G Nelles, A Yasuda, G Wegner
Affiliations

Up-conversion fluorescence: noncoherent excitation by sunlight

S Baluschev et al. Phys Rev Lett. .

Abstract

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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