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Xin Jin, Xianyong Ding, Guishang Pei, Shuaiqi Li, Xing’an Dong, Xiaolong Yang, Rui Wang, Peng Yu, and Xuewei Lü, Exploring the optoelectronic properties of calcium vanadate semiconductors: A combined experimental and DFT study, Int. J. Miner. Metall. Mater.,(2025). https://dx.doi.org/10.1007/s12613-025-3095-9
Xin Jin, Xianyong Ding, Guishang Pei, Shuaiqi Li, Xing’an Dong, Xiaolong Yang, Rui Wang, Peng Yu, and Xuewei Lü, Exploring the optoelectronic properties of calcium vanadate semiconductors: A combined experimental and DFT study, Int. J. Miner. Metall. Mater.,(2025). https://dx.doi.org/10.1007/s12613-025-3095-9
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钒酸钙半导体光电性能的探索:基于实验与密度泛函理论的综合研究

摘要: 金属钒酸盐因其独特的骨架结构、键强异质性以及强烈的O2−–V5+电荷转移带,在多种实际应用中展现出巨大的潜力,因而受到广泛关注。然而,其光电性能尚未得到充分研究。在本研究中,我们合成了三种高纯度钒酸钙(CaV2O6、Ca2V2O7和Ca3V2O8),并通过第一性原理计算与实验表征对其光电性能进行了系统研究。结果表明,CaV2O6、Ca2V2O7和Ca3V2O8均为间接带隙半导体,带隙范围为2.5–3.4 eV。通过密度泛函理论(DFT)与DFT+U方法的对比分析发现,标准DFT方法即可较为准确地描述这些钒酸盐的晶格参数与能带结构。进一步的发光研究显示,这些材料在可见光范围内具有显著的光致发光和电致发光性能。值得注意的是,CaV2O6的发光强度在仅施加0.88 GPa的低压下便实现了约十倍的增强,显示出其在压力可调光学器件中的卓越应用潜力。本研究结果为钒酸盐的电子结构与光学行为提供了更深层次的理解,并突显了其在荧光材料与光电器件应用中的良好前景。

 

Exploring the optoelectronic properties of calcium vanadate semiconductors: A combined experimental and DFT study

Abstract: Metal vanadates garner significant interest because of their exceptional potential for use in diverse practical applications, which stems from their unique framework structures, bond strength heterogeneities, and strong O2−–V5+ charge-transfer bands. However, their optoelectronic properties have not yet been sufficiently explored. In this study, we synthesized three high-purity calcium vanadate compounds (CaV2O6, Ca2V2O7, and Ca3V2O8) and comprehensively investigated their optoelectronic properties via first-principles calculations and experimental characterizations. CaV2O6, Ca2V2O7, and Ca3V2O8 are indirect band gap semiconductors with band gaps of 2.5–3.4 eV. A comparative analysis between density functional theory (DFT) and DFT+U calculations revealed that standard DFT was sufficient to accurately describe the lattice parameters and band gaps of these vanadates. Further luminescence studies revealed significant photo- and electro-luminescence properties within the visible light spectrum. Notably, the luminescence intensity of CaV2O6 exhibited a remarkable 10-fold enhancement under a modest pressure of only 0.88 GPa, underscoring its exceptional potential for use in pressure-tunable optical applications. These findings provide deeper insight into the electronic structures and optical behaviors of vanadates and highlight their potential as strong candidates for application in phosphor materials and optoelectronic devices.

 

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