铒镱共掺磷酸镧纳晶的合成和近红外荧光性质

doi:10.7517/j.issn.1674-0475.2010.01.10

影像科学与光化学 ›› 2010, Vol. 28 ›› Issue (1): 10-18.DOI: 10.7517/j.issn.1674-0475.2010.01.10

铒镱共掺磷酸镧纳晶的合成和近红外荧光性质

汪琦^1,2, 薄淑晖^1,2, 胡晋^1,2, 甄珍¹, 刘新厚¹

1. 中国科学院, 理化技术研究所, 有机光电功能材料与分子工程学重点实验室, 北京, 100190;
2. 中国科学院, 研究生院, 北京, 100049

收稿日期:2009-05-27 修回日期:2009-06-09 出版日期:2010-01-23 发布日期:2010-01-23
通讯作者: 刘新厚
基金资助:
中国科学院知识创新工程重点方向性项目(KJCX2.YW.H02);青年人才领域前沿项目

Synthesis and Characterization of Er-Yb Codoped LaPO₄ Nanocrystals Possessing Near-IR Fluorescence

WANG Qi^1,2, BO Shu-hui^1,2, HU Jin^1,2, ZHEN Zhen¹, LIU Xin-hou¹

1. Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R.China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P.R.China

Received:2009-05-27 Revised:2009-06-09 Online:2010-01-23 Published:2010-01-23

摘要/Abstract

摘要： 以磷酸三丁酯作为配体,使用高温溶液法合成了掺铒磷酸镧纳米晶体,高分辨电镜和XRD结果表明产物尺寸均一,直径4nm左右,具有高度的结晶性,在甲苯等有机溶剂中分散性良好.近红外发光光谱表明,产物在1535 nm处有发光峰,半高全宽为50 nm,高于目前掺铒光纤放大器(EDFA)的增益带宽.通过IR、元素分析研究发现,使用真空干燥等方法不能有效去除纳晶表面的羟基.为了进一步消除表面缺陷和猝灭基团对纳晶发光性质的影响,我们尝试在其外围生长一层LaPO₄壳做成核壳粒子以消除表面缺陷和隔离猝灭基团,结果表明,新的纳晶的发光强度得到了显著提高.

关键词: 磷酸镧, 掺铒材料, 纳米材料, 高温溶液法, 近红外发光

Abstract: Rare earth ions(Er³⁺,Eu³⁺ and Yb³⁺) doped LaPO₄ and YbPO₄ nanocrystals were synthesized by a coordinate precipitation method.In a high temperature organic solution the LaCl₃ and tributyl phosphate form a complex and react with H₃PO₄ to yield LaPO₄ nanocrystals.The structural properties of LaPO₄ nanocrystals were studied by X-ray diffraction(XRD),high resolution transmission electron microscopy(HRTEM),Fourier transform infrared spectrometer(FT-IR). HRTEM measured the size about 4 nm and showed the clear lattice fringe image of the nanocrystals which validated the high crystallinity.XRD patterns show that the samples crystallized in monazite structure.The emission of the nanocrystals under 975 nm excited was measured and the peak was at 1535 nm.Elemental analysis result revealed that the common desiccation in vacuum was failed to remove the residual quenching group such as O—H and C—H.When coated by a LaPO₄ shell the fluorescence intensity was obviously enhanced.It validated the conclusion that the core/shell structure could enhance the emission of nanocrystals.

Key words: LaPO₄, erbium doped material, nanocrystal, high temperature solvent, near infrared emission

中图分类号:

汪琦, 薄淑晖, 胡晋, 甄珍, 刘新厚. 铒镱共掺磷酸镧纳晶的合成和近红外荧光性质[J]. 影像科学与光化学, 2010, 28(1): 10-18.

WANG Qi, BO Shu-hui, HU Jin, ZHEN Zhen, LIU Xin-hou. Synthesis and Characterization of Er-Yb Codoped LaPO₄ Nanocrystals Possessing Near-IR Fluorescence[J]. Imaging Science and Photochemistry, 2010, 28(1): 10-18.

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铒镱共掺磷酸镧纳晶的合成和近红外荧光性质

Synthesis and Characterization of Er-Yb Codoped LaPO₄ Nanocrystals Possessing Near-IR Fluorescence

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铒镱共掺磷酸镧纳晶的合成和近红外荧光性质

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Synthesis and Characterization of Er-Yb Codoped LaPO₄ Nanocrystals Possessing Near-IR Fluorescence