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:
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