کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7839721 1505859 2018 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
How activator ion concentration affects spectroscopic properties on Ba4Y3F17: Er3+, Yb3+, a new perspective up-conversion material
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
How activator ion concentration affects spectroscopic properties on Ba4Y3F17: Er3+, Yb3+, a new perspective up-conversion material
چکیده انگلیسی
Ba4Y3F17 with Er3+ and Yb3+, a promising material for up-conversion luminescence, was synthesized. Excellent isomorphic capacity was detected. Low-temperature measurements show that erbium ions are incorporated in multiple lattice positions, which is inconsistent with the current model of Ba4Y3F17 crystal lattice structure. Activator ion concentration has a different impact on 4S3/2 and 4F9/2, states (for the green and red luminescence, respectively) depopulation. Energy transfer from Er3+ 4S3/2 state to Yb3+ is observed even at low temperature (15 K) while Er-Er cross-relaxation is observed from 120 K and above. Yb3+ concentration has a great impact to red-to-green up-conversion luminescence intensity ratio. Spectroscopic measurements allow to conclude that red up-conversion luminescence origins from 2.6 energy transfer steps form Yb3+ to Er3+ and violet up-conversion -3.5. Calculation shows that for the green up-conversion luminescence band, the internal quantum yield is in range 1.6-2.8% and for the red up-conversion luminescence, in the range -2.2-3.9%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 203, November 2018, Pages 376-384
نویسندگان
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