Optical spectroscopy of erbium-doped SrTiO.sub.3./sub. crystals

0432848 - FZÚ 2015 RIV NL eng J - Článek v odborném periodiku
Potůček, Z. - Skvortsov, A. P. - Poletaev, N.K. - Bryknar, Z. - Jastrabík, Lubomír - Dejneka, Alexandr - Trepakov, Vladimír
Optical spectroscopy of erbium-doped SrTiO₃ crystals.
Journal of Luminescence. Roč. 154, OCT (2014), s. 437-444. ISSN 0022-2313. E-ISSN 1872-7883
Grant CEP: GA TA ČR TA01010517; GA ČR GAP108/12/1941
Institucionální podpora: RVO:68378271
Klíčová slova: SrTiO₃ Er-doped crystals * optical absorption * photoluminescence of Er center * free charge carrier absorption
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.719, rok: 2014

Results of a detailed study of optical absorption and photoluminescence of SrTiO3:Er single crystals are presented. This study allowed us to specify the structure of energy levels that determine the main internal optical transitions within the 4f11 electron configuration of Er3+ ions in SrTiO3:Er crystals at temperatures below the transition from cubic to tetragonal phase. The numbers of energy levels of the studied multiplets obtained at 2 K correspond exactly to the theoretically expected numbers of crystal field levels for multiplets of only one type of Er3+ centers with non-cubic symmetry. Experimental results indicate that Er3+ ions most probably substitute for Sr2+ ions acting in SrTiO3+ as ionized donors. Such location of Er3+ ions is consistent with both n-type conductivity and substantial free charge carrier absorption in the infrared spectral region.
Trvalý link: http://hdl.handle.net/11104/0237203