کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5404113 | 1505930 | 2007 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High quantum efficiency YbAG-crystals
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this work, the growing process of Yb-doped YAG crystals is modified to achieve stoichiometric YbAG samples with a minimum quenching of the Yb3+-fluorescence. The best samples were grown by the Czochralski technique from rhenium-crucibles under reducing atmosphere (H2+N2). The as-grown YbAG crystals are of light blue color due to Yb2+-centers. The fluorescence lifetime of Yb3+ after annealing the YbAG crystals under oxidizing atmosphere is 862±15μs. The non-annealed samples show strong quenching of the Yb3+-fluorescence with a lifetime of only a few tens of microseconds depending on the actual growth conditions. This strong quenching is partially attributed to the Yb2+-centers giving rise to a cooperative energy transfer process among two excited Yb3+-ions and one non-excited Yb2+-ion. Typical quenching centers in Yb:YAG crystals grown from Ir-crucibles are Fe- and Ni-impurities. Another effective quenching center in non-annealed crystals is a complex center consisting of a Si2+-ion and a charge compensating oxygen vacancy with one trapped electron (F+color center). This type of center was identified by ESR- and ENDOR-measurements.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 125, Issues 1â2, JulyâAugust 2007, Pages 238-247
Journal: Journal of Luminescence - Volume 125, Issues 1â2, JulyâAugust 2007, Pages 238-247
نویسندگان
D. Fagundes-Peters, N. Martynyuk, K. Lünstedt, V. Peters, K. Petermann, G. Huber, S. Basun, V. Laguta, A. Hofstaetter,