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- W2079740052 abstract "We demonstrate up-conversion with an external quantum yield of 3.2% realized at ultra-low excitation intensities (∼0.1 W cm−2). The bimolecular up-conversion process in our systems relies on the presence of a metastable triplet excited state, and thus has substantially different photophysical characteristics when compared with the other known methods for photon up-conversion (two-photon absorption, parametric processes, second harmonic generation, sequential multiphoton absorption, etc). Thus, we state the general requirements for the materials' parameters of the couple sensitizer/emitter for obtaining triplet–triplet annihilation up-conversion. One of the applications we suggest for active materials compositions is the achievement of energetically stepwise up-conversion of the terrestrial solar spectrum towards blue wavelengths: as such they could be used for improving the efficiency of the solar cells. Up-conversion with non-coherent excitation by sunlight with wavelengths between 550 and 700 nm is demonstrated." @default.
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- W2079740052 date "2008-01-14" @default.
- W2079740052 modified "2023-10-02" @default.
- W2079740052 title "A general approach for non-coherently excited annihilation up-conversion: transforming the solar-spectrum" @default.
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- W2079740052 doi "https://doi.org/10.1088/1367-2630/10/1/013007" @default.
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