Photoluminescent behavior of SrB4O7:RE2+ (RE=Sm and Eu) prepared by Pechini, combustion and ceramic methods
| Autor: | Hermi F. Brito, M.A.F. Monteiro, Maria C.F.C. Felinto, Roberval Stefani, Ercules E.S. Teotonio, A. D. B. Maia |
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| Rok vydání: | 2006 |
| Předmět: |
Photoluminescence
Chemistry Inorganic chemistry Analytical chemistry Phosphor Condensed Matter Physics Combustion Molecular electronic transition Electronic Optical and Magnetic Materials Ion Inorganic Chemistry visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Emission spectrum Physical and Theoretical Chemistry Luminescence |
| Zdroj: | Journal of Solid State Chemistry. 179:1086-1092 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2006.01.006 |
| Popis: | This work reports the preparation of system containing RE2+ ions (RE=Sm and Eu)-doped in SrB4O7 matrix by ceramic, Pechini and combustion methods. These compounds were prepared by reduction of RE3+ to RE2+ 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 SrB4O7:Eu2+ system prepared by combustion and Pechini methods are characterized by a broad band assigned to interconfigurational 4f65d→4f7 transition, while SrB4O7:Sm2+ compound exhibit narrow emission bands arising from intraconfigurational-4f6 also shows 4G5/2→6HJ′ transitions ( J ′ = 5 2 , 7 2 , 9 2 and 11 2 ) arising from Sm3+ ion, transitions. SrB4O7:RE system prepared by combustion method presents emission bands from RE3+ ions as intense as that arising from RE2+, suggesting that the preparation route is not efficient for the reduction RE3+→RE2+ process. Emission quantum efficiency and radiative emission rates of Sm2+ ion are determined and discussed. |
| Databáze: | OpenAIRE |
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