Study On Composite Membrane Of Inorganic/Organic Nanometer Fluorides

Nanoparticles of YF₃:Eu, YF₃:Er and BaF₂:Er were prepared in the quaternary microemulsions of CTAB, n-butanol, n-octance and water. The X-ray diffraction (XRD) patterns were indexed to a pure YF₃ and BaF₂ phase. The diameter of the particles, calculated with the help of Debye-Scherrer equation, revealed that these particles were nanoparticles.The emission of YF₃:Eu nanoparticles peaked at 592nm(5D0→7F1). It showed that Eu of YF₃:Eu gets into crystal in the form of Eu³⁺, and occupies a symmetry center position. The fluorescence emission band of BaF₂:Er³⁺ nanoparticles peaked at 1540nm(4I13/2→4I15/2), there weren't other peaks between 650nm and 1800nm. The emission of YF₃:Er nanoparticles peaked at 1547nm(4I13/2→4I15/2), it has red shift and the emission of upconversion were red and green light.YF₃:Eu, BaF₂:Er and YF₃:Er nanoparticles modified by oleic acid were prepared using suface modification methed. Infrared spectroscopy (IR) was used to investigate the structure of the modified nanoparticles. The results indicate that oleic acid is bonded to the surface of nanoparticles. The modified nanoparticles have good dispersive capacity in organic solvent and mineral oil.The synthesis of YF₃:Eu/PMMA, YF₃:Er/PMMA and BaF₂:Er/PMMA composite materials were primarily studied. The difference of emission and excitation between YF₃:Eu /PMMA, YF₃:Er/PMMA, BaF₂:Er/PMMA composite materials and YF₃:Eu, YF₃:Er, BaF₂:Er nanoparticles were discovered by the fluorescence spectra. The positions of peaks were not changed, but the intensity was weaken. ESEM images showed that the nanoparticles are uniform in PMMA.