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

doi:10.7517/j.issn.1674-0475.2010.01.10

Imaging Science and Photochemistry ›› 2010, Vol. 28 ›› Issue (1): 10-18.DOI: 10.7517/j.issn.1674-0475.2010.01.10

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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

Abstract

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

CLC Number:

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

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