Upconversion Emission from Very Small SrF2: Yb3+, Tm3+ Nanoparticles
Paper ID : 1272-ICNS
Maryam sadat Ghorashi *1, Hamidreza Madaah Hosseini2, Ezeddin Mohajerani3
1Institute for nanoscience and nanotechnology, Sharif university of technology
2Materials Science and Engineering Department, Sharif University of Technology, Tehran, Iran.
3Laser and Plasma research Institute, Shahid Beheshti University, Tehran, Iran
Very small Tm3+, Yb3+-codoped SrF2 nanoparticles (~ 10 nm) were synthesized through a facile hydrothermal technique. Citrate ions were introduced as the capping agent into the reaction solution in order to control the growth of nanoparticles during the hydrothermal synthesis and to render them water-dispersible. Upconversion nanoparticles were characterized by field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform Infrared spectroscopy (FTIR) and 980 nm laser induced photoluminescence spectroscopy. The nanoparticles had single phase cubic structure and were capped by citrate ligands as being approved by XRD and FTIR analysis, respectively. Upconversion emission in visible (453, 480, 650 nm) and NIR (770 and 800 nm) region were obtained by the 980 nm irradiation. Nanoparticles with narrow size distribution and uniform morphology are directly dispersible in water and form a quite transparent suspension. High penetration of Near-Infrared excitation light into the body tissue makes these nanoparticles advantageous for tumor targeting in deeper tissues for the purpose of bioimaging and photodynamic therapy.
Upconversion Nanoparticles, Strontium fluoride, Hydrothermal Synthesis, Optical Properties
Status : Abstract Accepted (Poster Presentation)