Efficient upconversion fluorescence in NaYF^sub 4^:Yb^sup 3+^, Er^sup 3+^/mNaYF^sub 4^ multilayer core-shell nanoparticles

Here, we show a core-shell nanostructure which effectively improves NIR-to-visible upconversion quantum efficiency and luminescence intensity. The NaYF4:Yb3+, Er3+/mNaYF4 (m = 0, 1, 2, 3, 4, 5) core-shell nanoparticles are synthesized using a thermal decomposition method. The structure, morphology a...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-09, Vol.763, p.216
Main Authors: Huang, Qiying, Ye, Weihao, Jiao, Xianfu, Yu, Linliang, Liu, Yingliang, Liu, Xiaotang
Format: Article
Language:English
Subjects:
Core-shell particles
Core-shell structure
Erbium
Fluorescence
Fluorides
Morphology
Multilayers
Nanoparticles
Nanostructured materials
Quantum efficiency
Sodium compounds
Thermal decomposition
Upconversion
Ytterbium
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Summary:Here, we show a core-shell nanostructure which effectively improves NIR-to-visible upconversion quantum efficiency and luminescence intensity. The NaYF4:Yb3+, Er3+/mNaYF4 (m = 0, 1, 2, 3, 4, 5) core-shell nanoparticles are synthesized using a thermal decomposition method. The structure, morphology and fluorescence spectrum of the nanoparticles are confirmed by XRD, TEM and fluorometer. The average size of the as-prepared NaYF4:Yb3+, Er3+/mNaYF4 cores is about 8 nm while the thickness of the shells varies from 0.5 nm to 8 nm for different m values. With 980 nm excitation, the nanoparticles exhibit distinct emission peaks at 522 nm, 544 nm and 650 nm. It is noticed that an increasing shell thickness enhances their fluorescence intensity. The fluorescence lifetime and quantum yield of obtained multilayer NaYF4:Yb3+, Er3+/mNaYF4 nanoparticles are also discussed.
ISSN:0925-8388
1873-4669