Feng Yuxing

Fluorescence Properties of Eu3+/Gd3+/Citric Acid Mixed Complexes Doping in Silicon Rubber Matrix

Abstract Series of doped rare earth complexes-EuxGd(1-x) (CA)3 · nH2O (CA = citric acid) were synthesized. Some characterizations were taken for these complexes. The experimental results shows that the doped rare earth complexes have the best fluorescence property when the ratio of Eu and Gd is from 0.7 to 0.3. Silicon rubber-based composites were prepared by mechanical blending the EuxGd(1-x) (CA)3 · nH2O and silicon rubber. Then, the fluorescent property of the composites was studied. It is found that the fluorescence intensity of the composites increase linearly with the contents of the rare earth complexes increasing.

Preparation of Eu (TTA)2phen (MA)/SiR Fluorescent Materials under High Mechanical Blending Temperature

Abstract Eu(TTA) 2 (phen)(MA) complexes were synthesized, in which MA was introduced as the acidic ligand to increase the fluorescent intensity of the complexes. The complexes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and fluorescent spectra, respectively. Different amounts of rare earth complexes were blended with silicon rubber over the melting point of Eu(TTA) 2 (phen)(MA). Next, a definite amount of 2,5-dimethyl-2, 5-di (tert-butylperoxy) hexane was added as a cross linker to the composite, to get the uncured composites. Subsequently, the composites were vulcanized at 160 °C, and silicon rubber-based composites with different contents of the complexes were prepared and their fluorescent properties were observed. The contents of rare earth complexes were 0.96%, 2.83%, 4.63% and 6.36% (mass fraction), respectively. Moreover, the composites of Eu(TTA) 2 (phen)(MA)/SiR were measured by SEM, XRD, and fluorescent spectra. The measurement result shows that the fluorescent intensity of uncured rubber is similar to one of the pure rare earth complexes. However, there is no marked change of fluorescent intensity in the uncured rubber when the content of rare earth complexes continues to increase.