doi: 10.1103/PhysRevLett.97.143903.
Epub 2006 Oct 4.
Up-conversion fluorescence: noncoherent excitation by sunlight
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- PMID: 17155253
- DOI: 10.1103/PhysRevLett.97.143903
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Up-conversion fluorescence: noncoherent excitation by sunlight
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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