Abstract The surface plasmon resonance (SPR) effect induced by metal nanoparticles (NPs) can improve the visible-light response in photocatalysis. However, the optical shielding effect of NPs will scatter light, which reduces the utilization of light. With unique 4f electrons and multiple splitting of 4f orbits, lanthanide elements possess distinct luminescence property. Moreover, semiconductor can be excited by the role of up or down-conversion luminescence in rare earth. In this work, Yb with different contents were first doped in BiOBr via solvothermal method. Then, Pd NPs were deposited on Yb/BiOBr by photo-deposition. XRD, SEM, TEM, FT-IR, XPS, PL and Uv–vis-DRS were used to characterize the physical and optical structure of samples. The influence of Yb doping on the density of states (DOS) of BiOBr was analyzed by first principle calculation. The results show that the crystallinity and band-gap energy of BiOBr were promoted by Yb doping. Moreover, Yb doping promoted the exposure of active crystal face, which benefits the formation of Schottky junction after Pd deposition. The down-conversion luminescence of Yb can restrain the optical shielding effect and promote the SPR effect of Pd in photocatalysis.

中文翻译：

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Yb3+/Yb2+转化诱导的光致发光在Pd/Ybn+/BiOBr光催化剂体系中促进SPR效应的作用

摘要 金属纳米粒子 (NPs) 诱导的表面等离子体共振 (SPR) 效应可以改善光催化中的可见光响应。然而，NPs的光屏蔽作用会散射光，降低光的利用率。镧系元素具有独特的 4f 电子和 4f 轨道的多重分裂，具有独特的发光特性。此外，半导体可以通过稀土中的上转换或下转换发光的作用来激发。在这项工作中，首先通过溶剂热法将不同含量的 Yb 掺杂到 BiOBr 中。然后，通过光沉积将 Pd NPs 沉积在 Yb/BiOBr 上。XRD、SEM、TEM、FT-IR、XPS、PL 和 Uv-vis-DRS 用于表征样品的物理和光学结构。通过第一性原理计算分析了 Yb 掺杂对 BiOBr 态密度 (DOS) 的影响。结果表明，Yb掺杂提高了BiOBr的结晶度和带隙能。此外，Yb 掺杂促进了活性晶面的暴露，有利于 Pd 沉积后肖特基结的形成。Yb的下转换发光可以抑制光屏蔽效应，促进Pd在光催化中的SPR效应。