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Bi2−XErXWO6 photocatalysts were synthesized by a microwave solvothermal-calcination method. The Er3+ ions were doped into the crystal of Bi2WO6 and the photocatalysts show an up-conversion effect of the Er3+ 4f electrons: 4I15/2→4F7/2, 4I15/2→2H11/2, 4I15/2→4S3/2 and 4I15/2→4F9/2. The Er3+ ions absorb NIR light and convert it into visible light so that extra photons and electrons-holes are generated...
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