کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1680200 1518666 2015 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Radiation-induced transformations of luminescence centers in anion-defective alumina crystals under high-dose irradiations
ترجمه فارسی عنوان
تغییرات ناشی از تابش در مراکز لومینسانس در بلورهای آلومینایا با ضایعات آنیون تحت تابش اشعه ماوراء بنفش
کلمات کلیدی
آلومینا، اشعه ماوراء بنفش بالا، جای خالی اکسیژن، مراکز جمع آوری شده، فوتولومینسانس
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
چکیده انگلیسی


• Alumina crystals (Al2O3:C) were studied after exposures with doses up to 106 Gy.
• PL and PLE spectra of alumina crystals were measured after exposure to high-dose.
• New wide emission band was found in the PL spectra of irradiated crystals.
• High dose irradiations give rise to charged aggregate F2-type centers.
• Aggregate centers are responsible for the change in PL spectra and TL yield.

Luminescent spectroscopy is used to show formation of new trapping centers of charge carriers in anion-defective alumina crystals at radiation-induced transformations of F and F+-centers created by oxygen vacancies when exposed to high-dose gamma-radiation. A new wide band in the range 440–700 nm was registered in the photoluminescence spectrum at excitations with UV photons. High-dose irradiation of the crystals leads to appearance of F2-type aggregate centers in different charged states. These centers are additional traps of charge carriers. The new traps increase a luminescent yield at high-dose irradiation with gamma-rays and an electron beam.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 353, 15 June 2015, Pages 42–45
نویسندگان
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