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

JIA Ming-li; ZHANG Jia-hua

doi:10.3788/fgxb20173810.1267

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

更新时间：2020-08-12

- NIR Enhancement of β-NaGdF₄:Yb³⁺, Tm³⁺ Nanocrystals via Cation Exchange Reaction
- Chinese Journal of Luminescence Vol. 38, Issue 10, Pages: 1267-1272(2017)
- 作者机构：
  
  1. 发光学及应用国家重点实验室中国科学院长春光学精密机械与物理研究所,吉林长春,130033
  2. 运城学院物理与电子工程系,山西运城,044000
- 作者简介：
- 基金信息：
  
  Supported by Doctoral Research Foundation of Yuncheng University(YQ-2011035);National Natural Science Foundation of China(51172226,61275055,11274007,11174278,51402284)。
- DOI：10.3788/fgxb20173810.1267
  CLC： O482.31
- Received：08 July 2017，
  
  Revised：15 August 2017，
  
  Published Online：21 August 2017，
  
  Published：05 October 2017
- 稿件说明：
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贾明理, 张家骅,. 阳离子交换增强β-NaGdF4：Yb3+，Tm3+纳米晶近红外发光[J]. 发光学报, 2017,38(10): 1267-1272

JIA Ming-li, ZHANG Jia-hua,. NIR Enhancement of β-NaGdF4:Yb3+, Tm3+ Nanocrystals via Cation Exchange Reaction[J]. Chinese Journal of Luminescence, 2017,38(10): 1267-1272
贾明理, 张家骅,. 阳离子交换增强β-NaGdF4：Yb3+，Tm3+纳米晶近红外发光[J]. 发光学报, 2017,38(10): 1267-1272 DOI： 10.3788/fgxb20173810.1267.

JIA Ming-li, ZHANG Jia-hua,. NIR Enhancement of β-NaGdF4:Yb3+, Tm3+ Nanocrystals via Cation Exchange Reaction[J]. Chinese Journal of Luminescence, 2017,38(10): 1267-1272 DOI： 10.3788/fgxb20173810.1267.

摘要

为了增强-NaGdF

：Yb

，Tm

纳米晶的上转换发光，克服外延增长钝化壳增大尺寸的不足，利用阳离子交换法制备核壳纳米结构，研究了样品在980 nm激发下的上转换发光性质。首先，利用高温热分解法制备了直径为10 nm的-NaGdF

：Yb

，Tm

纳米晶；然后，将制备的纳米晶与Gd

在油酸-十八烯混合溶液中在300℃进行交换反应。实验结果表明，随着表面Yb

和Tm

被Gd

取代，钝化壳的形成抑制了内部Yb

的表面去激发过程，增强了内部Yb

（

） Tm

（

，

2，3

）的能量传递，上转换发光逐渐增强。交换30 min后，Tm

的

近红外发光增强达到最大，为对照样品的6.5倍，而尺寸基本保持不变。在生物成像方面，上转换纳米晶的尺寸必须与生物分子相匹配，同时发光强度要高，阳离子交换法既能增强近红外发光，又能保持原来小的尺寸，在生物成像领域具有很好的应用前景。

Abstract

In order to enhance upconversion luminescence of -NaGdF

:Yb

nanocrystals and meanwhile overcome the particle size enlargement caused by epitaxial growth technique

NaGdF

:Yb

@NaGdF

core-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

NaGdF

:Yb

nanocrystals with diameter about 10 nm were firstly prepared by thermal decomposition procedure. Then

the cation exchange reaction of the nanocrystals with Gd

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 Yb

de-excitation by the cation exchange shell and the enhancement of energy transfer from Yb

(

) to Tm

(

) inside of the nanocrystals. The maximum improvement of NIR emission for Tm

transition 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.

关键词

Keywords

references

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⁰

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

DOI：10.3788/fgxb20173810.1267

摘要

Abstract

关键词

Keywords

references

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