Atomic-scale distortion of optically activated Sm dopants identified with site-selective X-ray absorption spectroscopy

作者：Ishii Masashi^*; Crowe Iain F; Halsall Matthew P; Hamilton Bruce; Hu Yongfeng; Sham Tsun Kong; Harako Susumu; Zhao Xin Wei; Komuro Shuji

来源：Journal of Applied Physics, 2013, 114(13): 133505.

DOI：10.1063/1.4824375

The local structure of luminescent Sm dopants was investigated using an X-ray absorption fine-structure technique with X-ray-excited optical luminescence. Because this technique evaluates X-ray absorption from luminescence, only optically active sites are analyzed. The Sm L-3 near-edge spectrum contains split 5d states and a shake-up transition that are specific to luminescent Sm. Theoretical calculations using cluster models identified an atomic-scale distortion that can reproduce the split 5d states. The model with C-4v local symmetry and compressive bond length of Sm-O of a six-fold oxygen (SmO6) cluster is most consistent with the experimental results.

• 出版日期2013-10-7
• 单位Canadian Light Source Inc.; Saskatoon