Abstract
Er3+ and Tm3+ ions are the important lanthanides used in the near-infrared (NIR) photocatalysts with upconversion properties, while their individual contributions to the photocatalytic activities are still unclear yet. Herein, two NIR photocatalysts of Er3+/Yb3+ codoped (CaWO4@(TiO2/CaF2) (EY-CTC) and Tm3+/Yb3+ codoped (CaWO4@(TiO2/CaF2) (TY-CTC) are synthesized, and their photocatalytic activities are tested by the methyl orange degradation processes. A higher NIR-driven degradation rate (19.21%) is found over TY-CTC compared to EY-CTC with 12.93%. In contrast, due to the stronger UV light absorption and the more efficient electron–hole pair separation, EY-CTC exhibits better photocatalytic activity (99.02%) compared to TY-CTC (94.43%) under UV–vis-NIR irradiation.
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