Defect chemistry and VUV optical properties of the BaMgAl10O17:Eu2+–Ba0.75Al11O17.25:Eu2+ solid solution
| Autor: | Anthony L. Diaz, Samuel Patraw, Valerie Pike, Barry G. DeBoer |
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| Rok vydání: | 2003 |
| Předmět: |
Dopant
Chemistry Energy transfer Exciton Spinel Analytical chemistry Phosphor engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Materials Chemistry Ceramics and Composites engineering Physical and Theoretical Chemistry Luminescence Excitation Solid solution |
| Zdroj: | Journal of Solid State Chemistry. 173:359-366 |
| ISSN: | 0022-4596 |
| Popis: | The optical properties of the BaMgAl10O17:Eu2+ (BAM)–Ba0.75Al11O17.25:Eu2+ (BAL) solid solution have been studied using VUV excitation, emission and reflectance spectroscopy. Three unique Eu2+ emission centers are observed in a ratio that depends on the composition of the host and the dopant concentration. Two of the emission centers are assigned to Eu on normal Beevers–Ross sites and Eu on anti Beevers–Ross sites. The defect chemistry of this system is modeled based on the known behavior of the spinel (MgO·nAl2O3) system. Based on this model, the third Eu center can be assigned either to Eu near Al vacancies or to Eu associated with O atoms in the cation layer. In undoped materials exciton emission is observed, peaking at 263 nm in BAM and 285 nm in BAL. This emission may be the mechanism of host-to-activator energy transfer in these phosphors. |
| Databáze: | OpenAIRE |
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