Enhanced green emission from La0.4F3:Ce0.45,Tb0.15/TiO2 core/shell structure

Nano sized La0.4F3:Ce0.45,Tb0.15 (core), La0.4F3:Ce0.45,Tb0.15 (TiO2) (core) shell, La0.55F:Ce0.45, and La0.85F3:Tb0.15 particles were synthesized by adopting co-precipitation technique in acidic environment and coated with TiO2 to form a core-shell structure by adopting a mechanical dispersion method at room temperature. The synthesized materials were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis) absorption, photoluminescence and lifetime spectroscopy. The crystal structure of La0.4F3:Ce0.45,Tb0.15 remained the same as LaF3 after being doped with Ce and Tb ions but with a slight decrease in the lattice parameter. TEM image confirmed the formation of a core-shell structure. The La0.4F3:Ce0.45,Tb0.15/TiO2 exhibited Tb3+ fluorescence enhancement by a factor of 1.76. Scintillation from the synthesized materials was also observed under X-ray excitation.

TEM images of thickly TiO2 coated La0.4F3:Ce0.45,Tb0.15 with insert showing the diffraction patternFigure optionsDownload as PowerPoint slide