| Автор | F K Koschnick |
| Автор | T Hangleiter |
| Автор | K S Song |
| Автор | J Spaeth |
| Дата выпуска | 1995-08-21 |
| dc.description | BaFBr is usually contaminated with oxygen which influences the performance of this well known X-ray storage phosphor material. Oxygen is incorporated as a diamagnetic O<sup>2-</sup> ion on F- sites with a nearby charge-compensating vacancy in the Br<sup>-</sup> sublattice, as is known from the paramagnetic O<sup>-</sup><sub>F</sub> and F(Br<sup>-</sup>) centres created by room-temperature X-irradiation and studied in detail with electron paramagnetic resonance (EPR) techniques. It is shown that BaEBr:O<sup>2-</sup><sub>F</sub> has a luminescence band excited at 4.95 eV, peaking at 2.43 eV with two radiative lifetimes of 0.2 ms and 1 ms, respectively. With luminescence-detected EPR (i.e. optically detected magnetic resonance (ODMR)), it is shown that the luminescence is due to an excited triplet state of an O<sup>2-</sup><sub>F</sub>-Br<sup>-</sup> vacancy pair. Time-resolved ODMR measurements reveal the same radiative lifetimes as seen in luminescence. No singlet emission was observed. The zero-field splitting can be explained assuming a F(Br<sup>-</sup>)-O<sup>-</sup><sub>F</sub> pair defect as the excited triplet state. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Optically detected magnetic resonance study of an oxygen-vacancy complex in BaFBr |
| Тип | paper |
| DOI | 10.1088/0953-8984/7/34/015 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 7 |
| Первая страница | 6925 |
| Последняя страница | 6937 |
| Аффилиация | F K Koschnick; Fachbereich Phys., Paderborn Univ., Germany |
| Аффилиация | T Hangleiter; Fachbereich Phys., Paderborn Univ., Germany |
| Аффилиация | K S Song; Fachbereich Phys., Paderborn Univ., Germany |
| Аффилиация | J Spaeth; Fachbereich Phys., Paderborn Univ., Germany |
| Выпуск | 34 |
