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
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

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 980â¯nm laser excitation, Yb3+ and Er3+ co-doped Sr2LaF7 phosphors exhibit red emission around 670â¯nm generated by the 4F9/2 â 4I15/2 transition and green emissions centering around 550â¯nm and 523â¯nm generated by the 4S3/2 â 4I15/2 and 2H11/2 â 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 =â¯8, and the corresponding Commission International de Lâ²Eclairage (CIE) coordinates are calculated to be xâ¯=â¯0.4293 and yâ¯=â¯0.5589 with reddish yellow color visible to naked eyes under the 980â¯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
Journal: Journal of Luminescence - Volume 200, August 2018, Pages 133-140
نویسندگان
Jing Xie, Jianxiong Bin, Ming Guan, Haikun Liu, Dexin Yang, Jiangeng Xue, Libin Liao, Lefu Mei,