Abstract
A reduction phenomenon of Eu 3+→Eu 2+ was observed for the first time when Eu 3+ ions were doped into an AlO 4-tetrahedron-containing compound BaAl 2O 4 in an oxidizing atmosphere of air by high-temperature solid-state reaction. X-ray powder diffraction patterns and photoluminescent spectra are used to confirm the compound structure and detect the simultaneous existence of both divalent and trivalent europium ions, respectively. The abnormal Eu 3+→Eu 2+ reduction is explained by a charge compensation model. Spectroscopic properties of BaAl 2O 4:Eu are discussed and Eu 2+ emission spectrum shows consistence with the results reported by Katsumata et al. [J. Cryst. Growth 198/199 (1999) 869.] and Lin et al. [Mater. Chem. Phys. 70 (2001) 156.]
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