A novel near-infrared (NIR) photocatalyst of Er3+/Yb3+-(CaF2@TiO2) was synthesized with optically active centers (Er3+/Yb3+) presented both in the CaF2 cores and TiO2 shells, and the corresponding upconversion luminescence properties increased greatly, which was helpful for the organic dye solution removal efficiency under NIR irradiation.
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Huang et al. (2013) studied this question.
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