A Method to Improve the Up-Conversion Fluorescence of Polymer Modified NaYF4:Yb,Er(Tm) Nanocomposites


The modification of NaYF4:Yb,Er(Tm) nanoparticles synthesized in the presence of an ionic surfactant is critical to their application in biological fields for better solubility and biocompatibility. In this work, NaYF4:Yb,Er(Tm) was transformed from insoluble, inactive to hydrophilic, biocompatible via ligand exchange modification with polyacrylic acid (PAA). Ligand exchange was carried out at room temperature when a colloidal solution of NaYF4:Yb,Er(Tm) in tetrahydrofuran (THF) was treated with excess PAA. The PAA modified NaYF4:Yb,Er(Tm) nanoparticles got better surface properties but with declined inner up-conversion fluorescence. Generally, coating an analogous layer of material outside the core nanoparticles can improve the optical properties of the core. Accordingly, NaYF4:Yb,Er(Tm)/NaYF4 nanoparticles were synthesized before PAA modification to avoid the optical intensity decaying. The result of fluorescence test proved that the water soluble NaYF4:Yb,Er(Tm)/NaYF4/PAA nanocomposites had a sound up-conversion property compared with that of NaYF4:Yb,Er(Tm)/PAA. Furthermore, the up-conversion fluorescence property of the nanocomposite varied with the doping ratio of Er(Tm) to Yb and the possible mechanism for this change was also discussed.

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W. Cui, S. Ni, S. Shan and X. Zhou, "A Method to Improve the Up-Conversion Fluorescence of Polymer Modified NaYF4:Yb,Er(Tm) Nanocomposites," World Journal of Nano Science and Engineering, Vol. 2 No. 2, 2012, pp. 41-46. doi: 10.4236/wjnse.2012.22007.

Conflicts of Interest

The authors declare no conflicts of interest.


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