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. 2015 Jul 17;6:7800. doi: 10.1038/ncomms8800

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(a) Absorption spectra for R6G on W₁₈O₄₉ compared with neat W₁₈O₄₉ and R6G dye. (b) Energy-level diagram of R6G on oxygen-deficit W₁₈O₄₉ measured in a vacuum.