Energy Diagrams of Lanthanide Energy Levels in Perovskite‐Type Calcium‐Based Double Oxides Examined by X‐Ray Photoelectron Spectroscopy
Energy Diagrams of Lanthanide Energy Levels in Perovskite‐Type Calcium‐Based Double Oxides Examined by X‐Ray Photoelectron Spectroscopy
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X射线光电子能谱检测钙钛矿型钙基双氧化物中镧系元素能级的能级图
DOI：
10.1002/pssb.202100450
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Shimizu Yuhei
中科院分区：
文献类型：
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作者：
Ueda Kazushige;Yamamoto Ryo;Shimizu Yuhei
利用X射线光电子能谱（XPS）研究了CaMO 3（M=Ti，Sn，Zr，Hf）中三价镧系离子（Ln 3+）的4f基态能级。从未掺杂和掺杂Ln ~（3+）材料的XPS谱中提取的Ln ~（3+）~（4f）能级，计算了Ln ~（3+）~（4f）的价带顶能级，特别是Tb ~（3+）的价带顶能级。Ln ~（3+）~（4f）能级的Z字形曲线的能量位置是指从XPS测量获得的Tb ~（3+）~（4f）能级。还从未掺杂和Eu 3+掺杂材料的吸收和光致发光激发光谱估计了能隙和Ln 2 + 4f能级。在实验值的基础上，示出了在VBM处对齐的能量图并进行了比较，以理解钙钛矿型钙基双氧化物的电子结构中的Ln 4f能级。
The energy levels of 4fground states for trivalent lanthanide ions (Ln3+) in CaMO3(M=Ti, Sn, Zr, Hf) are examined using X‐ray photoelectron spectroscopy (XPS). Some Ln3+4fenergy levels referred to the valence band maximum (VBM), especially for Tb3+, are evaluated from the Ln3+4fstates extracted by the difference XPS spectra between nondoped and Ln3+‐doped materials. The energy position of the zigzag curves for the Ln3+4fenergy levels are referred to the Tb3+4fenergy levels obtained from the XPS measurements. Energy gaps and Ln2+4fenergy levels are also estimated from the absorption and photoluminescence excitation spectra of nondoped and Eu3+‐doped materials. On the basis of the experimental values, the energy diagrams aligned at the VBM are illustrated and compared to understand the Ln 4fenergy levels in the electronic structures of the perovskite‐type calcium‐based double oxides.