高压后EuI_2的结构及光谱性质研究

Studies on Structure and Fluorescence Spectra of High-pressure-treated EuI_2

研究了高压后ＥｕＩ２的结构及光谱性质，发现高压后其结构由单斜转化为正交，对称性和Ｅｕ２＋配位数均有增加，４ｆ６５ｄ能级间距加大，能级重心降低，还讨论了发射光谱的红移现象，指认了新出现的４４９ｎｍ处的发射峰，并报道了ＥｕＩ２新的正交结构（ＥｕＩ２－Ｖ）。

The structure and fluorescence properties of high-pressure-reated EuI2 were studied.The structural change of EuI2 from monoclinic to orthorhombic and the increase of both structural symmetry and coordination number of Eu2+ were observed respectively.It was found that high-pressure treatment could split the energy levels of 4f￣65d and made the central energy levels lower so as to induce the red shift of emission spectra.Moreover,a new emission peak (449 nm) is assigned and a new phase(EuI_2-Ⅴ) is reported.