Abstract The solar spectral converters mainly involve the energy transfer between two codoped ions. Here, we report a series of Ce3+, Cr3+, Ln3+ (Ln = Yb, Nd, Er) tridoped Gd3Sc2Ga3O12 (GSGO) phosphors with improved absorption and increasing near infrared (NIR) emission. We observed the multiple energy transfer behaviors of Cr3+→Ln3+, Ce3+→Ln3+, Ce3+→Cr3+, and Ce3+→Cr3+→Ln3+ in GSGO matrix. When Ce3+ is introduced into the GSGO:Cr3+,Ln3+ phosphors, the energy transfer of Ce3+→Cr3+→Ln3+ has been realized by utilizing the energy transfer bridge of the Cr3+ ion. Consequently, GSGO:Ce3+,Cr3+,Ln3+ can absorb almost all ultraviolet and visible (UV–Vis) light and produce strong NIR light thanks to the synergistic effect of Ce3+→Cr3+→Ln3+, improving the photovoltaic conversion efficiency of c-Si solar cells. Our results show that the prepared GSGO:Ce3+,Cr3+,Ln3+ have the potential application in the solar spectral material for c-Si solar cells. Meanwhile, the strategy of multiple energy transfers gives a new way to design the spectral conversion materials with wider absorption for c-Si solar cells.

中文翻译：

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通过多重能量转移实现新型 Ce3+,Cr3+,Ln3+ (Ln = Yb, Nd, Er) 三掺杂近红外荧光粉的宽带光谱转换

摘要 太阳光谱转换器主要涉及两个共掺杂离子之间的能量传递。在这里，我们报告了一系列 Ce3+、Cr3+、Ln3+（Ln = Yb、Nd、Er）三掺杂 Gd3Sc2Ga3O12（GSGO）荧光粉，它们具有改善的吸收和增加的近红外（NIR）发射。我们观察到 GSGO 矩阵中 Cr3+→Ln3+、Ce3+→Ln3+、Ce3+→Cr3+ 和 Ce3+→Cr3+→Ln3+ 的多种能量转移行为。当将Ce3+引入GSGO:Cr3+,Ln3+荧光粉时，利用Cr3+离子的能量传递桥实现了Ce3+→Cr3+→Ln3+的能量传递。因此，由于Ce3+→Cr3+→Ln3+的协同作用，GSGO:Ce3+,Cr3+,Ln3+几乎可以吸收所有紫外和可见光（UV-Vis）并产生强近红外光，提高c-Si太阳能电池的光伏转换效率. 我们的结果表明，制备的 GSGO:Ce3+, Cr3+、Ln3+在c-Si太阳能电池的太阳光谱材料中具有潜在的应用前景。同时，多重能量转移策略为设计用于c-Si太阳能电池的吸收更广的光谱转换材料提供了一种新方法。