کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5398389 | 1505883 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effect of intentional potassium co-doping on the luminescent properties of Yb3+ and Tm3+ doped α-NaYF4 core and core-shell nanoparticles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The effect of intentional potassium co-doping on the luminescent properties of Yb3+ and Tm3+ doped α-NaYF4 core and core-shell nanoparticles The effect of intentional potassium co-doping on the luminescent properties of Yb3+ and Tm3+ doped α-NaYF4 core and core-shell nanoparticles](/preview/png/5398389.png)
چکیده انگلیسی
Simple and effective ways to circumvent limited luminescence efficiency of up-converting nanoparticles (UCNPs) are sought. One of the methods relays on distorting the crystallographic structure of host material by co-doping the nanocrystals with optically inactive co-dopants. Here we study the influence of K+ doping and surface passivation on the up-converting properties of the α-NaYF4 nanocrystals co-doped with 20% Yb3+ and 0.1 or 2% Tm3+. The intentionally chosen concentrations of K+ ions, which were meant to replaced sodium ions were fixed to 0, 5, 10, 20 to 30%. Potassium ions modified the spectroscopic properties of both core and core-shell NPs, but the differences were noticed between samples doped with 0.1% Tm3+ and 2% Tm3+ ions. Replacement of sodium by potassium ions decreased up-conversion luminescence intensity as well as shortened thulium excited states lifetimes in the samples doped with 0.1% Tm3+, while the opposite behavior was found in the samples co-doped with higher 2% thulium concentration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 178, October 2016, Pages 34-42
Journal: Journal of Luminescence - Volume 178, October 2016, Pages 34-42
نویسندگان
MaÅgorzata Misiak, WiesÅaw StrÄk, Sebastian Arabasz, Artur Bednarkiewicz,