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• W2084392637 abstract "The efficiency of many solar energy conversion technologies is limited by their poor response to low-energy solar photons. One way for overcoming this limitation is to develop materials and methods that can efficiently convert low-energy photons into high-energy ones. Here we show that thermal radiation is an attractive route for photon energy upconversion, with efficiencies higher than those of state-of-the-art energy transfer upconversion under continuous wave laser excitation. A maximal power upconversion efficiency of 16% is achieved on Yb3+-doped ZrO2. By examining various oxide samples doped with lanthanide or transition metal ions, we draw guidelines that materials with high melting points, low thermal conductivities and strong absorption to infrared light deliver high upconversion efficiencies. The feasibility of our upconversion approach is further demonstrated under concentrated sunlight excitation and continuous wave 976-nm laser excitation, where the upconverted white light is absorbed by Si solar cells to generate electricity and drive optical and electrical devices. Energy transfer upconversion can increase the absorption efficiency but has been limited by multiphonon relaxation. Here, Wang et al. demonstrate that photon energy upconversion by thermal radiation benefits from multiphonon relaxation and achieves efficiencies as high as 16%." @default.
• W2084392637 created "2016-06-24" @default.
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• W2084392637 date "2014-11-28" @default.
• W2084392637 modified "2023-09-30" @default.
• W2084392637 title "Photon energy upconversion through thermal radiation with the power efficiency reaching 16%" @default.
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• W2084392637 doi "https://doi.org/10.1038/ncomms6669" @default.
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• W2084392637 hasPublicationYear "2014" @default.
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