Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (5): 545-549.DOI: 10.3724/SP.J.1077.2014.13448

• Research Paper • Previous Articles     Next Articles

Synthesis of NaYF4:Yb3+, Er3+ Upconversion Nanoparticles Using Hydrogel Networks as a Template

QIU Mu-Shu1, 2, LIN Min1, 2, ZHAO Ying2, DONG Yu-Qing2, LU Tian-Jian2, XU Feng1, 2   

  1. (1. The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China; 2. Bioinspired Engineering and Biomechanics Center, Xi’an Jiaotong University, Xi’an 710049, China)
  • Received:2013-09-02 Revised:2013-10-22 Published:2014-05-20 Online:2014-04-24
  • About author:QIU Mu-Shu. E-mail: qiumushu@gmail.com
  • Supported by:

    Major International Joint Research Program of China (11120101002); Key Project of Chinese Ministry of Education (313045); Fundamental Research Funds for the Central Universities (2012jdhz46)

Abstract: Hydrogel network structures were used as nano-sized reactors for synthesizing NaYF4:Yb3+, Er3+ upconversion nanoparticles with controlled size. By adjusting the crosslinking density, hydrogel networks with different sizes were prepared and used as reactor to control the size of synthesized nanoparticles. The particle size and upconversion luminescence property of the nanoparticles were characterized using XRD, TEM and photoluminescence (PL) spectra. The results show that the size of synthesized NaYF4:Yb3+, Er3+ nanoparticles is around 10 nm. The diameter and the luminescence intensity decrease with increase of hydrogel crosslinking density. The increased crosslinking density reduces Ostwald ripening and increases pore pressure, which limit the growth of nanoparticles. The decreased particle size results in broken bonds on the particle surface and particle scattering. Besides, the hydrogel may also quench the fluorescence of the nanoparticles. This research provides a simple and environmentally friendly method for synthesizing uniform upconversion nanoparticles.

Key words: rare earth, upconversion, upconversion nanoparticle, hydrogel network, crosslinking density

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