Time-resolved spectroscopy of exciton states in single crystals and single crystalline films of YAlO3 and YAlO3:Ce
| Autor: | L. Grigorjeva, Krisjanis Smits, S. Zazubovich, V. Laguta, I. Kondakova, Martin Nikl, Tiit Kärner, Vladimir Babin, Yu. Zorenko |
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| Přispěvatelé: | Institute of Physics [Tartu], University of Tartu, Ivan Franko National University of Lviv, Institute for Problems of Material Science, NAS, Institute of Physics, AS CR, Kazimierz Wielki University in Bydgoszcz |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Materials science
time-resolved luminescence spectroscopy Acoustics and Ultrasonics Exciton perovskites 02 engineering and technology Electron 01 natural sciences NMR spectroscopy Impurity 0103 physical sciences Ceramic 010306 general physics 021001 nanoscience & nanotechnology Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Photoexcitation Crystallography visual_art density functional calculations visual_art.visual_art_medium Time-resolved spectroscopy 0210 nano-technology Luminescence Excitation |
| Zdroj: | Journal of Physics D: Applied Physics Journal of Physics D: Applied Physics, IOP Publishing, 2011, 44 (31), pp.315402. ⟨10.1088/0022-3727/44/31/315402⟩ |
| ISSN: | 0022-3727 1361-6463 |
| DOI: | 10.1088/0022-3727/44/31/315402⟩ |
| Popis: | Luminescence characteristics of single crystals (SC) and single crystalline films (SCF) of YAlO3 and YAlO3 : Ce are studied at 4.2–300 K under photoexcitation in the 4–20 eV energy range. The origin and structure of the intrinsic and impurity defects responsible for various exciton-related emission and excitation bands are identified. The ≈5.6 eV emission of YAlO3 SCF is ascribed to the self-trapped excitons. In YAlO3 SC, the dominating 5.63 eV and 4.12 eV emissions are ascribed to the excitons localized at the isolated antisite defect and at the defect associated with the nearest-neighbouring oxygen vacancy, respectively. The thermally stimulated release of the electrons, trapped at these defects, takes place around 200 K and 280 K, respectively. The presence of -related defects and isolated oxygen vacancies (AlO5 units) in YAlO3 SC is confirmed by NMR measurements. The formation energies of various -related defects are calculated within the density functional theory. The influence of various intrinsic and impurity defects on the luminescence characteristics of Ce3+ centres is clarified. |
| Databáze: | OpenAIRE |
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