Iranian Journal of Physics Research

Visible and near infrared upconversion emission from Tm3+, Yb3+ ‎doped SrF2 nanoparticles

Document Type : Original Article

Authors

M Ghorashi 1
H R Madaah-Hosseini 2
E Mohajerani 3

1 Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran, Iran

2 Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran

3 Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran

https://doi.org/10.47176/ijpr.20.4.37861
Abstract
Tm3+, Yb3+-codoped SrF2 nanoparticles were synthesized through a facile hydrothermal ‎technique. Citrate ions were introduced as the capping agent into the reaction. Upconversion ‎nanoparticles were characterized by field emission scanning electron microscopy (FESEM), ‎Energy dispersive x-ray spectroscopy (EDS), x-ray diffraction (XRD), Dynamic light scattering ‎‎(DLS), Zeta potential, Fourier transform Infrared spectroscopy (Ft-IR), and the 980 nm laser induced ‎photoluminescence spectroscopy. Rare-earth ions (Na+), which are the cations of citrate salts, ‎are incorporated into the structure to  act as charge compensators. Upconversion emission in the ‎visible and NIR region was observed by the 980 nm irradiation. Nanoparticles with a narrow size ‎distribution and a uniform morphology were directly dispersible in water, forming a quite transparent ‎suspension. Nanoparticles size was approximately 10 nm. High penetration of the  Near-Infrared light into ‎the body tissue makes these nanoparticles appropriate for tumor targeting in the deeper tissues for ‎the purpose of bioimaging and photodynamic therapy‎.
 

Keywords

upconversion nanoparticles
strontium fluoride
‎ Tm and Yb dopants
hydrothermal ‎synthesis
optical properties‎
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