کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5399319 1505896 2015 26 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optical properties of pure and Ce3+ doped gadolinium gallium garnet crystals and epitaxial layers
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Optical properties of pure and Ce3+ doped gadolinium gallium garnet crystals and epitaxial layers
چکیده انگلیسی
Results of X-ray diffraction and low temperature optical absorption measurements of cerium doped gadolinium gallium garnet single crystals and epitaxial layers are reported. In the region of intra-configurational 4f-4f transitions the spectra of the bulk crystals exhibit the signatures of several different Ce3+ related centers. Apart from the dominant center, associated with Ce substituting gadolinium, at least three other centers are found, some of them attributed to the so-called antisite locations of rare-earth ions in the garnet host, i.e., in the Ga positions. X-ray diffraction data prove lattice expansion of bulk GGG crystals due to the presence of rare-earth antisites. The concentration of the additional Ce-related centers in epitaxial layers is much lower than in the bulk crystals. However, the Ce-doped layers incorporate a large amount of Pb from flux, which is the most probable source of nonradiative quenching of Ce luminescence, not observed in crystals grown by the Czochralski method.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 164, August 2015, Pages 31-37
نویسندگان
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