A Facile Approach to Fabrication of Hexagonal-Phase NaYF4:Yb3+, Er3+ Hollow Nanospheres: Formation Mechanism and Upconversion Luminescence

Authors

  • Junwei Zhao,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
    2. Graduate School of Chinese Academy of Sciences, Beijing 100039, P. R. China
    3. Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
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  • Xiaomin Liu,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
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  • Di Cui,

    1. College of Chemistry, University of Wuhan, Wuhan 430072, P. R. China
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  • Yajuan Sun,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
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  • Yi Yu,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
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  • Yifei Yang,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
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  • Chuang Du,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
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  • Yu Wang,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
    2. Graduate School of Chinese Academy of Sciences, Beijing 100039, P. R. China
    3. Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
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  • Kai Song,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
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  • Kai Liu,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
    2. Graduate School of Chinese Academy of Sciences, Beijing 100039, P. R. China
    3. Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
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  • Shaozhe Lu,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
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  • Xianggui Kong,

    1. Key Laboratory of Excited-State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
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  • Hong Zhang

    1. Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
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Abstract

The hexagonal-phase NaYF4:Yb3+, Er3+ hollow nanospheres (HNS) have been successfully prepared for the first time by means of a hydrothermal route with the aid of polyethylenimine (PEI) as a surfactant. The nitrogen adsorption/desorption isotherms demonstrated the porous nature of the NaYF4 HNS. The formation mechanism was explored based on the effects of the reaction parameters. The NaYF4 solid spheres underwent a dissolution-recrystallisation transformation and a hollowing process when the hydrothermal reaction time was prolonged. The localised Ostwald ripening mechanism was proposed to account for the formation of NaYF4 HNS, in which loose aggregations were found to be crucial. The upconversion luminescence of NaYF4:Yb3+, Er3+ HNS was also investigated. It is expected that these NaYF4 HNS might have potential in applications as building blocks for biolabels and drug-delivery.

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