A series of characteristic 3D flower-like BiOCl photocatalysts constructed by the self-assembling of BiOCl nanosheets substructures were synthesized through hydrothermal method, in which Ho³⁺/Yb³⁺ and Er³⁺/Yb³⁺ ion pairs were introduced to co-dope BiOCl to enhance photo-catalytic activity. Their structure, shape and morphology were not only characterized by power X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) and transmission electron microscopy (TEM), but also calculated the host electronic structure. The photocatalytic performances of Ho³⁺/Yb³⁺ and Er³⁺/Yb³⁺ co-doped BiOCl samples were enhanced greatly and evaluated by the degradation of rhodamine B (RhB) in aqueous solutions under the irradiation of stimulated sunlight and 450 nm blue light. To understand the potential reason, optical properties of the as-synthesized BiOCl samples were characterized by UV-vis diffuse reflectance spectra, up-conversion (UC) and down-conversion (DC) luminescence spectra were also investigated. The possible photo-catalytic mechanism was also raised, which develops a feasible method to improve the photocatalytic activity by combining with luminescence.

通过水热法合成了由BiOCl纳米片子结构的自组装构建的一系列特征性的3D花状BiOCl光催化剂，其中将Ho ³⁺ / Yb ³⁺和Er ³⁺ / Yb ³⁺离子对引入共-掺杂BiOCl以增强光催化活性。它们的结构，形状和形态不仅通过功率X射线衍射（XRD），场发射扫描电子显微镜（FE-SEM）和透射电子显微镜（TEM）进行了表征，还计算了主体电子结构。Ho ³⁺ / Yb ³⁺和Er ³⁺ / Yb ³⁺的光催化性能在受激阳光和450 nm蓝光照射下，水溶液中若丹明B（RhB）的降解大大增强了共掺杂BiOCl样品的性能，并对其进行了评估。为了理解潜在的原因，通过紫外可见漫反射光谱表征了合成后的BiOCl样品的光学性能，还研究了上转换（UC）和下转换（DC）发光光谱。还提出了可能的光催化机理，为结合光致发光提高光催化活性提供了一种可行的方法。