کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5399469 | 1505903 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Near-surface layer radiation color centers in lithium fluoride nanocrystals: Luminescence and composition
ترجمه فارسی عنوان
مراکز رنگ آمیزی لایه در سطح نزدیک به نانوبلورهای فلوراید لیتیوم: لومینسانس و ترکیب
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کلمات کلیدی
مرکز رنگ رنگ، فوتولومینسانس، فلوراید لیتیم، نانوکریستال، ترکیب مرکزی، تابش یونیزه،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
چکیده انگلیسی
Lithium fluoride nanocrystals are irradiated by gamma quanta at 77Â K. The radiation color centers formed in a near-surface layer of nanocrystals are studied. Absorption, luminescence and luminescence excitation spectra of the surface defects have been measured. It has been found that the luminescence excitation spectra for aggregated surface centers consist of two or three bands with not very much different intensities. Reactions of the surface centers separately with electrons and with anion vacancies have been investigated. Numbers of anion vacancies and electrons entering into the centers composition have been established and it has been found that FS1, FS1â, FS2, FS2â, FS3+ and FS3 types of the surface centers are formed. The degree of luminescence polarization has been defined and it has been determined that the polarization degree for FS2+ centers changes sign under transition from one excitation band to another. It has been shown that during irradiation at 77Â K radiation-induced defects are formed more efficiently on the surface than in the bulk.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 157, January 2015, Pages 28-34
Journal: Journal of Luminescence - Volume 157, January 2015, Pages 28-34
نویسندگان
A.P. Voitovich, V.S. Kalinov, A.P. Stupak, A.N. Novikov, L.P. Runets,