Luminescence and radiation-induced color centers in anion-defective alumina crystals after high-dose irradiation
Autor: | S. V. Zvonarev, V. A. Pustovarov, V. S. Kortov, T.V. Shtang |
---|---|
Rok vydání: | 2016 |
Předmět: |
Radiation
Photoluminescence Materials science business.industry Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Crystallographic defect Spectral line 030218 nuclear medicine & medical imaging Ion 03 medical and health sciences 0302 clinical medicine Ultraviolet visible spectroscopy Optoelectronics Photoluminescence excitation Irradiation 0210 nano-technology business Luminescence Instrumentation |
Zdroj: | Radiation Measurements. 90:90-93 |
ISSN: | 1350-4487 |
DOI: | 10.1016/j.radmeas.2016.01.010 |
Popis: | A method of UV spectroscopy was used to measure photoluminescence (PL) spectra and photoluminescence excitation (PLE) spectra in anion-defective alumina crystals exposed to high doses of gamma-radiation. An additional emission band in the range of 1.6–2.75 eV appears in the exposed crystals. Aggregate F 2 -type centers in different charge states are responsible for this band. It was found that growing intensity of PL aggregate centers occurs at doses corresponding to saturation of dose response and is accompanied by a sharp drop in the intensity of F + -band in the PL spectrum resulting from combination of F + -centers into aggregates. Uncharged F 2 -centers are formed when electrons are trapped by F 2 + and F 2 2+ -centers. The main role of F + -centers in radiation-induced transformations of color centers under high-dose irradiation of anion-defective alumina crystals was indicated. |
Databáze: | OpenAIRE |
Externí odkaz: |