Preparation and fluorescence properties of Eu(TTA)_3phen/polymer and Sm(TTA)_3 phen/polymer composites

摘要

Two rare-earth organic complexes (Eu(TTA)_3phen and Sm(TTA)_3phen) with high fluorescent intensity were synthesized by reaction of Europium chloride, or Samarium chloride with 2-thenoyltrifluoroacetone (HTTA) and 1, 10-phenanthroline (phen). The complexes structures were elucidated by Infrared Spectroscopy and Elementary Analysis. The Eu(TTA)_3phen/Polymer and Sm(TTA)_3phen/Polymer composites were prepared by blending rare earth complexes with nitrible rubber(NBR) or poly(methylmethacrylate)(PMMA). The composites were characterized by Scanning Electron Microscopy, Transmission Electron Microscopy, Fluorescence Spectroscopy and X-rays Diffraction. As for the Eu(TTA)_3phen/PMMA and Sm(TTA)_3phen/PMMA composites we found that their fluorescent intensity is relatively lower compared with that of Eu(TTA)_3phen/NBR and Sm(TTA)_3phen/NBR composites, due to the poor compatibility of PMMA with the rare earth organic complexes. At the same time it was found that the rare earth organic complexes were dispersed homogeneously into the NBR matrix and no fluorescence quenching happens up to 19.05% of the complexes concentration, instead, a higher fluorescent intensity was still maintained. Moreover the fluorescence intensity of cured composites is much higher than that of the uncured rare earth complexes/polymer composites. Another interesting phenomenon is the fluorescent intensity of cured composites is much higher than that of the pure rare earth organic complexes when the concentration of the complexes reaches 13.04%.