Controllable Synthesis and Peculiar Optical Properties of Lanthanide-Doped Fluoride Nanocrystals

Authors

  • Prof. Dr. Guoping Dong,

    Corresponding author
    1. State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640 (P. R. China)
    • State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640 (P. R. China)

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  • Huilin He,

    1. State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640 (P. R. China)
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  • Qiwen Pan,

    1. State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640 (P. R. China)
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  • Gengxu Chen,

    1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062 (P. R. China)
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  • Junhua Xie,

    1. State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640 (P. R. China)
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  • Dr. Zhijun Ma,

    1. State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640 (P. R. China)
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  • Prof. Dr. Mingying Peng

    1. State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640 (P. R. China)
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Abstract

Yb3+/Tm3+-codoped NaYF4 nanocrystals with different phases (cubic α and hexagonal β) and morphologies (nanoparticles, nanorods, nanoplates) have been controllably fabricated by a convenient hydrothermal synthesis technique. Up-conversion emission peaks were observed at λ=450, 475, 645, and 700 nm, which were assigned to the 1D23F4, 1G43H6, 1G43F4, and 3F23H6 transitions of Tm3+ ions, respectively. By using a homemade detection system, the anisotropic polarized emission properties of individual NaYF4:Yb, Tm nanorods and nanoplates were investigated. The results indicated that the polarization emission ratio, ρ, of the 1G43F4 emission of individual NaYF4:Yb,Tm nanorods was 0.18, whereas the anisotropic polarization emission of individual NaYF4:Yb,Tm nanoplates could be neglected; this indicated that the size and morphology of the nanocrystal played an important role in the polarized emission properties. Investigation into the mechanism indicated that the dielectric mismatch was not the predominant mechanism for the polarized emission of individual NaYF4:Yb,Tm nanorods. The as-prepared NaYF4:Yb,Tm nanocrystals, with controllable morphology and anisotropic polarized emission properties, are expected to be widely applied as polarized light resources, bio-labels, photodetectors, and so forth.

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