NIR Enhancement of -NaGdF4: Yb3+, Tm3+Nanocrystals via Cation Exchange Reaction

	NIR Enhancement of -NaGdF4: Yb3+, Tm3+Nanocrystals via Cation Exchange Reaction
	Jia, M.-L. and J.-H. Zhang
	2017
发表期刊	Faguang Xuebao/Chinese Journal of Luminescence
卷号	38 期号:10
摘要	In order to enhance upconversion luminescence of -NaGdF4: Yb3+, Tm3+nanocrystals and meanwhile overcome the particle size enlargement caused by epitaxial growth technique, NaGdF4: Yb3+, Tm3+@NaGdF4core-shell nanostructure was prepared using cation exchange strategy. The upconversion luminescence of the core-shell nanocrystals was investigated under 980 nm laser excitation. The oleate-capped -NaGdF4: Yb3+, Tm3+nanocrystals with diameter about 10 nm were firstly prepared by thermal decomposition procedure. Then, the cation exchange reaction of the nanocrystals with Gd3+was performed in l-octadecene and oleic acid mixture solution at 300. Experimental results show that the cation exchange strategy has significantly enhanced upconversion luminescence brightness of the nanocrystals, which attribute to the suppression of inner Yb3+de-excitation by the cation exchange shell and the enhancement of energy transfer from Yb3+(2F5) to Tm3+(3H5,3F2, 3) inside of the nanocrystals. The maximum improvement of NIR emission for Tm3+3H43H6transition is achieved with 6.5 times than that of the contrast sample after 30 min of exchange reaction. It demonstrates that the cation exchange strategy can not only enhance NIR luminescence of the nanocrystals, but also well retain small particle size. It provides a simple and convenient way to development of high brightness upconversion nanocrystas with comparable in size to biomolecules, which has enormous applications in biomedical imaging fields. 2017, Science Press. All right reserved.
收录类别	ei
语种	中文
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/58959
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Jia, M.-L. and J.-H. Zhang. NIR Enhancement of -NaGdF4: Yb3+, Tm3+Nanocrystals via Cation Exchange Reaction[J]. Faguang Xuebao/Chinese Journal of Luminescence,2017,38(10).
APA	Jia, M.-L. and J.-H. Zhang.(2017).NIR Enhancement of -NaGdF4: Yb3+, Tm3+Nanocrystals via Cation Exchange Reaction.Faguang Xuebao/Chinese Journal of Luminescence,38(10).
MLA	Jia, M.-L. and J.-H. Zhang."NIR Enhancement of -NaGdF4: Yb3+, Tm3+Nanocrystals via Cation Exchange Reaction".Faguang Xuebao/Chinese Journal of Luminescence 38.10(2017).

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