کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1487062 1510692 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of SiO2 layer on the plasmon quenched upconversion luminescence emission of core-shell NaYF4:Yb,Er@SiO2@Ag nanocomposites
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Influence of SiO2 layer on the plasmon quenched upconversion luminescence emission of core-shell NaYF4:Yb,Er@SiO2@Ag nanocomposites
چکیده انگلیسی


• β-NaYF4:Yb,Er@SiO2@Ag core-shell hybrid nanostructures are prepared.
• Qualitative research the competition between SPCE enhancement and energy transfer.
• Single core-shell hybrid particle is taken to investigate the luminescence.

β-NaYF4:Yb,Er@SiO2@Ag core-shell hybrid nanostructures are prepared and single core-shell hybrid particle is taken to investigate the influence of separation layer on the metal enhanced upconversion luminescence and corresponding mechanism. It is found that the green (4S3/2 → 4I15/2) and red (4F9/2 → 4I15/2) emissions of Er3+ increase first and then decrease with the increase of silica shell thickness. The best enhancement is observed at the silica thickness of 12 nm. Time-resolved spectra study shows that the emission enhancement dominates when the silica thickness is 12 nm, which leads to an enhancement factor of 1.28. But the enhancement factor reduces to 0.52 when the silica shell thickness is 5 nm. Here, we define enhancement factor g(ωF) as g(ωF)=IF/I0g(ωF)=IF/I0, IF and I0 are fluorescence intensities of UCNPs with emission enhancement and without plasmon enhancement. The luminescence enhancement is owing to the enhanced emission process rather than the excitation process.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 83, November 2016, Pages 515–521
نویسندگان
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