Abstract
We have investigated the Eu<sup>3+</sup> ion luminescence spectra from different host crystals of the lanthanide sesquioxides exhibiting either the A, B, or C form. The Eu<sup>3+</sup> ion luminescence spectra from B-type Eu<sub>2</sub>O<sub>3</sub> and from Eu<sup>3+</sup>-doped A-type La<sub>2</sub>O<sub>3</sub> and C-type Lu<sub>2</sub>O<sub>3</sub> were obtained at room temperature. It is suggested that the luminescence from <i>f-f</i> transitions in the Eu<sup>3+</sup> ion can be used to determine the crystal structure, because the different Eu<sup>3+</sup> ion site symmetries in the different crystal structures give rise to different characteristic spectral splitting patterns.
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