Experimental evidence for the aggregation of photostimulable centers in BaFBr:Eu2+single crystals by cross relaxation spectroscopy
| Autor: | Johann Martin Spaeth, F. K. Koschnick, W. G. McDugle, R. H. D. Nuttall, R. S. Eachus |
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| Rok vydání: | 1991 |
| Předmět: |
chemistry.chemical_classification
Electron nuclear double resonance Materials science General Physics and Astronomy law.invention Ion Paramagnetism Nuclear magnetic resonance chemistry law Activator (phosphor) Atomic physics Electron paramagnetic resonance Spectroscopy Inorganic compound Single crystal |
| Zdroj: | Physical Review Letters. 67:3571-3574 |
| ISSN: | 0031-9007 |
| DOI: | 10.1103/physrevlett.67.3571 |
| Popis: | Spatial correlation between the activator ion ${\mathrm{Eu}}^{2+}$ and electron and hole traps generated by x irradiation is thought to play a decisive role in the photostimulated emission process of the storage phosphor BaFBr:${\mathrm{Eu}}^{2+}$. We report the first direct experimental evidence for correlations among F centers, hole centers, and ${\mathrm{Eu}}^{2+}$ obtained by measuring cross relaxation effects in optically detected paramagnetic resonance. BaFBr treated with the known procedures for removing oxygen still retains 50 ppm or more ${\mathrm{O}}^{2\mathrm{\ensuremath{-}}}$. This ion is critically involved in the formation of F and hole centers. |
| Databáze: | OpenAIRE |
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