کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1888018 1533400 2016 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Luminescence and radiation-induced color centers in anion-defective alumina crystals after high-dose irradiation
ترجمه فارسی عنوان
لومینسانس و مراکز رنگ ناشی از تشعشع در بلورهای آلومینا آنیون معیوب پس از تابش با دوز بالا
کلمات کلیدی
آلومینا؛ جای خالی اکسیژن؛ مراکز جمع آوری شده؛ فوتولومینسانس
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
چکیده انگلیسی


• PL and PLE spectra of the alumina crystals exposed to high doses were measured.
• Aggregate F2-type centers are responsible for an additional PL band.
• The PL of aggregate centers is accompanied by a decreasing intensity of F+- band.
• F+-centers cause formation of charged aggregate color centers.
• F-centers are not engaged in creation of aggregate centers.

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 F2-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 F2-centers are formed when electrons are trapped by F2+ and F22+-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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Measurements - Volume 90, July 2016, Pages 90–93
نویسندگان
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