کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7839965 1505862 2018 30 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrothermal synthesis and upconversion luminescent properties of Sr2LaF7 doped with Yb3+ and Er3+ nanophosphors
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Hydrothermal synthesis and upconversion luminescent properties of Sr2LaF7 doped with Yb3+ and Er3+ nanophosphors
چکیده انگلیسی
Upconversion phosphors Sr2LaF7 co-doped with Yb3+ and Er3+ are synthesized via hydrothermal method. The phase compositions of Sr2LaF7 phosphors with different amounts of Yb3+ and Er3+ dopants, pH values, and complexing agents are characterized by X-ray diffraction (XRD). The crystal structure and morphology of Sr2LaF7 phosphor doped with 15% Yb3+/ 1% Er3+ is refined by the Rietveld method and transmission electron microscopy (TEM). Under 980 nm laser excitation, Yb3+ and Er3+ co-doped Sr2LaF7 phosphors exhibit red emission around 670 nm generated by the 4F9/2 → 4I15/2 transition and green emissions centering around 550 nm and 523 nm generated by the 4S3/2 → 4I15/2 and 2H11/2 → 4I15/2 transitions of Er3+, respectively. The optimum synthetic conditions for upconversion luminescence for Sr2LaF7 co-doped with Yb3+ and Er3+ are discussed and determined to be 15% Yb3+/ 1% Er3+ with EDTA-2Na as the complexing agent under pH value = 8, and the corresponding Commission International de L′Eclairage (CIE) coordinates are calculated to be x = 0.4293 and y = 0.5589 with reddish yellow color visible to naked eyes under the 980 nm laser excitation. The related upconversion mechanisms of Yb3+ and Er3+ co-doped Sr2LaF7 depending on the pump power are also studied in detail.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 200, August 2018, Pages 133-140
نویسندگان
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