کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1459374 989592 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhancement of the red upconversion luminescence in NaYF4:Yb3+, Er3+ nanoparticles by the transition metal ions doping
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Enhancement of the red upconversion luminescence in NaYF4:Yb3+, Er3+ nanoparticles by the transition metal ions doping
چکیده انگلیسی

In recent years, the application of upconversion nanoparticles, especially in vivo, has so far largely been hampered due to the strong tissue absorption of short-wavelength light below 600 nm. Therefore, it is an urgent need to carry out some new selective approaches to increase red emission efficiency. This work reports an effective strategy to enhance red upconversion emission of NaYF4:Yb3+, Er3+ nanocrystals by doping with the different concentrations of transition metal ions (Mn2+ or Fe3+). The upconversion emission spectra of the samples demonstrated that the red emissions were significantly enhanced and that different transition metal ions had a distinguishable effect on the red upconversion luminescence. Compared with the pure NaYF4:Yb3+, Er3+ nanoparticles, the red upconversion emission intensity of the nanoparticles co-doped with 10 mol% Mn2+ was increased by nearly as high as 14 times. In addition, the red emission intensity was increased by about 24 times, which was observed in the sample co-doped with 30 mol% Fe3+. The mechanism of the enhancement was discussed detailedly. Both the improvement of the nanoparticles׳ crystallinity and the redistribution of electron cloud around the Er3+ ions after introducing Mn2+ or Fe3+ were confirmed to be the origin of the improvement. The enhancement in red upconversion luminescence intensity makes the upconversion nanoparticles versatile imaging tools for diagnosis.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 41, Issue 10, Part B, December 2015, Pages 14545–14553
نویسندگان
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