کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7839893 | 1505861 | 2018 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Luminescent properties of radiation induced defects in sodium and magnesium fluorides nanocrystals
ترجمه فارسی عنوان
خواص لومینسانس نقص های ناشی از تابش در نانوبلورهای سدیم و فلوراید منیزیم
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کلمات کلیدی
فلورید سدیم، فلوراید منیزیم، نانوکریستال، نقص تابش، لومینسانس، تعامل الکترون-فونون،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
چکیده انگلیسی
The possibility of formation of radiation defects with new luminescent properties is investigated in sodium and magnesium fluorides nanosized crystals. Nanocrystals obtained by mechanical fragmentation of the single crystals have been irradiated by γ-rays at 77â¯K or electron beams at room temperature. Their TEM images have been received. Luminescence, luminescence excitation and absorption spectra of nanocrystals have been measured immediately after γ-irradiation without samples defrosting and after termination of the defects aggregation processes at room temperature. The formation of radiation color centers with previously unknown optical characteristics has been discovered in nanocrystals. Numbers of anion vacancies and electrons entering into these centers composition were established in sodium fluoride. The structure transformation of the centers, containing two anion vacancies and an electron, was revealed after sodium fluoride samples defrosting. For sodium fluoride the data on the Huang-Rhys parameters and lifetimes of the photoluminescence for here studied and previously known centers of the same composition are determined and compared. The results obtained show that near-clusters color centers can be formed in crystals with different structures and atomic compositions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 201, September 2018, Pages 57-64
Journal: Journal of Luminescence - Volume 201, September 2018, Pages 57-64
نویسندگان
A.P. Voitovich, V.S. Kalinov, P.A. Loiko, E.F. Martynovich, X. Mateos, A.N. Novikov, P.P. Pershukevich, L.P. Runets, J.M. Serres, A.P. Stupak,