Photoluminescence and Electron Spin Resonance of Silicon Dioxide Crystal with Rutile Structure (Stishovite)
| Autor: | Trukhin, A. N., Antuzevics, A. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | physica status solidi (a) (2019) Volume 215, Issue 16, 1800487 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1002/pssa.201800457 |
| Popis: | An electron spin resonance (ESR) and photoluminescence signal is observed in the as grown single crystal of stishovite indicating the presence of defects in the non-irradiated sample. Photoluminescence of the as received stishovite single crystals exhibits two main bands - a blue at 3 eV and an UV at 4.75 eV. Luminescence is excited in the range of optical transparency of stishovite (below 8.75 eV) and, therefore, is ascribed to defects. A wide range of decay kinetics under a pulsed excitation is observed. For the blue band besides the exponential decay with a time constant of about 18 {\mu}s an additional ms component is revealed. For the UV band besides the fast component with a time constant of 1-3 ns a component with a decay in tens {\mu}s is obtained. The main components (18 {\mu}s and 1-3 ns) possess a typical intra-center transition intensity thermal quenching. The effect of the additional slow component is related to the presence of OH groups and/or carbon molecular defects modifying the luminescence center. The additional slow components exhibit wave-like thermal dependences. Photo-thermally stimulated creation-destruction of complex comprising host defect - interstitial modifiers explains slow luminescence wave-like thermal dependences. Comment: 12 pages, 11 figures |
| Databáze: | arXiv |
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