Study structural and up-conversion luminescence properties of polyvinyl alcohol/CaF2:erbium nanofibers for potential medical applications

Document Type : Research Paper


1 Department of Physics, Ferdowsi University of Mashhad, Mashhad, Iran

2 Faculty of Science, Nanotechnology Research Center, Ferdowsi University, Mashhad, Iran


This paper describes synthesisPolyvinyl Alcohol/CaF2:Er nanofibers because of  its  photoluminescence properties.
Materials and Methods: 
First, CaF2:Er nanocomposite synthesized with co-precipitation method. In order to prepare polyvinyl alcohol (PVA)/CaF2:Er nanofibers, CaF2:Er nanocomposites were added to the polyvinyl alcohol (PVA) polymer. PVA/CaF2:Er composite nanofibers were successfully prepared by electrospinning technique.

X-Ray Diffraction (XRD) pattern and Transmission Electron Microscopy (TEM) images indicate that the CaF2:Er nanocomposite was formed with cubic phase and the average crystalline size was calculated using the Scherrer's equation is about 26-28 nm. Scanning Electron Microscopy (SEM) images show that the diameters of the fine nanofibers are in the range of 60-110 nm. For studying luminescence properties of the nanofibers, the samples excited with different wavelengths and show excellent Up-Conversion luminescence transition.
Photoluminescence spectrums of the PVA/CaF2:Er nanofibers illustrate up-conversion luminescence process. This unique property can have high potential for laser application and bio-imaging in medical technology.


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