Baluschev S, Miteva T, Yakutkin V, Nelles G, Yasuda A, Wegner G. Up-conversion fluorescence: noncoherent excitation by sunlight.
PHYSICAL REVIEW LETTERS 2006;
97:143903. [PMID:
17155253 DOI:
10.1103/physrevlett.97.143903]
[Citation(s) in RCA: 253] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2006] [Indexed: 05/12/2023]
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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