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Abstract
This work reports the preparation of system containing RE 2+ ions ( RE=Sm and Eu)-doped in SrB 4O 7 matrix by ceramic, Pechini and combustion methods. These compounds were prepared by reduction of RE 3+ to RE 2+ in air, which exhibit some different features according to the preparation method. Photoluminescent properties of these systems were investigated based on the emission and excitation spectral data. The emission spectra of SrB 4O 7:Eu 2+ system prepared by combustion and Pechini methods are characterized by a broad band assigned to interconfigurational 4 f 65 d→4 f 7 transition, while SrB 4O 7:Sm 2+ compound exhibit narrow emission bands arising from intraconfigurational-4 f 6 also shows 4 G 5/2→ 6 H J′ transitions ( J ′ = 5 2 , 7 2 , 9 2 and 11 2 ) arising from Sm 3+ ion, transitions. SrB 4O 7: RE system prepared by combustion method presents emission bands from RE 3+ ions as intense as that arising from RE 2+, suggesting that the preparation route is not efficient for the reduction RE 3+→ RE 2+ process. Emission quantum efficiency and radiative emission rates of Sm 2+ ion are determined and discussed.
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