The low-usage of solar energy and the sluggish separation efficiency of the photogenerated electrons/holes pairs are the obstacles in the practical application of photocatalysts. The integration of upconversion and Z-scheme heterojunction is expected to break the barriers to achieve the efficient charge separation and broaden near-infrared light absorption. Herein, an effective indirect Z scheme AgInS₂/In₂S₃ heterostructure with carbon quantum dots (CQDs, as the electron conduction medium) and Lu₃NbO₇:Yb, Ho (as upconversion function) has been successfully synthesized. Consequently, the Lu₃NbO₇: Yb, Ho/CQDs/AgInS₂/In₂S₃ heterostructure exhibited superior photocatalytic activities for Cr(VI) reduction and H₂O₂ production, reducing 99.9% of Cr(VI)(20 ppm, 15 min) and 78.5% of Cr(VI) (40 ppm, 30 min) with visible light irradiation as well as 94.0% of Cr(VI) (20 ppm, 39 min) under NIR light irradiation. Simultaneously, the heterostructure could generate 902.9 μM H₂O₂ for 5 h under visible light irradiation. The intensive photocatalytic properties could primarily be attributed to the boosted light absorption capacity, the improved solar-to-energy conversion by the remarkable upconversion capacity of Lu₃NbO₇: Yb, Ho/CQDs and the faster charge transfer through a Z-schematic pathway. This work is anticipated to open a novel “window” for designing the efficient photocatalysts by coupling of Lu₃NbO₇: Yb, Ho and CQDs.

太阳能利用率低和光生电子/空穴对分离效率低是光催化剂实际应用的障碍。上转换和Z型异质结的集成有望打破障碍，实现有效的电荷分离并拓宽近红外光吸收。在此，成功地合成了具有碳量子点（CQDs，作为电子传导介质）和Lu ₃ NbO ₇ :Yb，Ho（作为上转换函数）的有效间接Z方案AgInS ₂ /In ₂ S ₃异质结构。因此，Lu ₃ NbO ₇ : Yb, Ho/CQDs/AgInS ₂ /In ₂S ₃异质结构对 Cr(VI) 还原和 H ₂ O ₂生成表现出优异的光催化活性，可减少 99.9% 的 Cr(VI)（20 ppm，15 分钟）和 78.5% 的 Cr(VI)（40 ppm，30 分钟）可见光照射以及近红外光照射下 94.0% 的 Cr(VI) (20 ppm, 39 min)。同时，该异质结构在可见光照射下5小时可产生902.9 μM H ₂ O _{2 。Lu 3} NbO ₇显着的上转换能力提高了光的吸收能力，提高了太阳能到能量的转换能力。：Yb、Ho/CQD 和通过 Z 示意图路径的更快电荷转移。_{这项工作有望为通过 Lu 3} NbO ₇ : Yb、Ho 和 CQD的耦合设计高效光催化剂打开一个新的“窗口” 。