properties of trimellitic acid and europium-doped, coated materials, preparation and fluorescence

Title: trimellitic acid and europium-doped, coated materials, preparation and fluorescence 　　Author: Chang-jun
　　Degree-granting unit: Harbin Institute of Technology
　　Key words: rare earth complexes;; doping;; fluorescence intensity
　　Summary:
　　Rare earth organic complexes are an important class of fluorescent light-emitting materials. Study found that in europium complexes by adding a certain amount of non-fluorescent rare-earth ions or coated, not only can enhance the fluorescence intensity, but also greatly Neodymium magnets reduces the processing costs.
　　In this paper, chemical coprecipitation Eu (TLA) (TLA: trimellitic acid) binary complexes and Eu (TLA) phen (phen: phenanthroline) ternary complex, from the reaction temperature, the pH value, concentration of the preparation process in three areas studied, in the synthesis of ternary complexes, based on the fluorescence of inert ion doped Gd, La, Y and sol - gel prepared Eu (TLA) / SiO2 luminescent materials . The use of infrared spectroscopy (FTIR), thermal gravimetric analysis (TG-DTG), fluorescence spectroscopy (PL), scanning electron microscopy (SEM) and other samples of the system structure, fluorescent properties and morphology characterization analysis.
　　The results of this paper show that the optimum preparation conditions of reaction temperature 80 ℃, pH = 7, the solution concentration of 0.1 mol / L, the obtained Eu (TLA) and the binary complexes Eu (TLA) Phen ternary complex. Infrared spectra indicate that Eu (TLA) and Eu (TLA) phen complexes formed with the bit in the form of bidentate chelate ligand. Fluorescence spectroscopy shows that Eu (TLA) and Eu (TLA) phen excitation spectra and emission spectra of similar shape and position of peaks, but the Eu (TLA) phen relative fluorescence intensity increased, the performance of the second ligand "co- effect. " Fluorescence studies have shown that doping inert ions on the fluorescence enhancement, the optimal doping mole fraction, respectively X_Gd = 0.6, X_ (La) = 0.5, X_Y = 0.2, fluorescence enhancement of fluorescence inert ions in order of Gd ~ (3 +)> La ~ (3 +)> Y ~ (3 +). Infrared spectra indicate that the success obtained Eu (TLA) / SiO_2 composite material. From the pH value, TEOS (TEOS) amount of distilled water consumption, water http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php bath temperature of four factors on the coating process research, the best preparation conditions are obtained at pH 9, TEOS dosage of 2mL, water bath temperature of 50 ℃, the second amount of deionized water 6mL. Analysis by fluorescence spectroscopy and found that coating material emission intensity increase compared with complexes about 48%.
　　Degree Year: 2010