Upconversion nanoparticles that convert low-energy light into high-energy light hold promise for boosting solar-cell efficiency and enabling highly sensitive biological assays. But their spectral conversion under broadband excitation has been challenging, until now.
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Xie, X., Liu, X. Upconversion goes broadband. Nature Mater 11, 842–843 (2012). https://doi.org/10.1038/nmat3426
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DOI: https://doi.org/10.1038/nmat3426
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