کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5399224 | 1392675 | 2016 | 5 صفحه PDF | دانلود رایگان |
- We have identified divalent ytterbium ions in the optical Yb: YAG ceramic.
- Electron configuration of the ground state of Yb2+ is 4f136s.
- Pulsed cathodoluminescence and transmission spectra of Yb2+ appear at 913-1050Â nm.
- Yb2+ ions in association with oxygen vacancies generate ReâF centres.
- ReâF centres are able to absorb at 280, 365, 630Â nm.
- ReâF centres are able to emit at 325, 520, 590â720 590-720Â nm.
This study reports the presence of Yb2+ ions with 4f136s electron configuration of the ground state in addition to Yb3+ ions in yttrium aluminium garnet ceramics activated by ytterbium. Pulsed cathodoluminescence and transmission spectra of divalent ytterbium ions appear as narrow lines of sâs transitions at 913-1050 nm range. These ions in association with oxygen vacancies generate Re-F centres which are able to absorb at 280, 365, 630 nm and emit at 325, 520, 590â720 nm in dâs transitions of Yb2+ ions; the emission band at 590-720 nm consists of eight narrow lines. The Re-F centeres are manifested most clearly in the ceramic samples obtained directly after vacuum sintering at 1800 °C.
Journal: Journal of Luminescence - Volume 169, Part A, January 2016, Pages 151-155