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Er 3+ /Yb 3+  co-doped Bi 5 O 7 I uniform porous microsphere photocatalysts were synthesized by a two-step chemical method, which possesses excellent photocatalytic performance and upconversion luminescence property. The photocatalytic performance of the photocatalysts was studied by degradation of bisphenol A in aqueous solution under visible light and different monochromatic light irradiation. The photocatalytic performance of Er 3+ /Yb 3+  co-doped Bi 5 O 7 I sample is better than that of the pristine Bi 5 O 7 I and Er 3+ -doped Bi 5 O 7 I samples. Moreover, Er 3+ /Yb 3+  co-doped Bi 5 O 7 I possesses photocatalytic ability with a red light monochromatic LED lamp (3 W, λ = 630 nm) and an infrared monochromatic LED lamp (100 W, λ = 940 nm) irradiation whose wavelength is longer than the absorption-limiting wavelength of pristine Bi 5 O 7 I sample. This phenomenon further verified that the upconversion property of Er 3+  and Yb 3+  causes the improved photocatalytic efficiency of Er 3+ /Yb 3+  co-doped Bi 5 O 7 I sample.

Fabrication of Er3+/Yb3+ Co-Doped Bi5O7I Microsphere With Upconversion Luminescence and Enhanced Photocatalytic Activity for Bisphenol A Degradation