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Control Synthesis and Luminescence Properties of Lanthanide Phosphate and Oxide

Author: LiuYanChao
Tutor: DongHongXing
School: Harbin Engineering University
Course: Chemical Engineering
Keywords: Nanomaterials Rare earth phosphate luminescent materials Rare earth oxides Morphology Control
CLC: TB34
Type: Master's thesis
Year: 2011
Downloads: 34
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Abstract


Rare earth luminescent materials because of its has excellent luminous performance in the areas of lighting, display a wide range of applications in the field of imaging, biomedical image, radiation detection and solar equipment manufacturing. Explore the method of synthesis of the luminescent material, the luminescent properties of the luminescent material in microscopic dimensions, and at the microscale level of luminescent materials in the electron transitions to its luminescent properties and by the synthesis method of controlling the precise regulation of its luminescence performance has important research significance. It is precisely because of phosphate the luminous and oxide luminescent materials have excellent light performance and a wide range of applications, the paper mainly controlled synthesis of rare earth phosphate and oxide luminescent materials, a more detailed study. LaPO4 monoclinic phase crystal synthesized by the hydrothermal method, and doping of Ce3 CE3 and Tb3 lanthanum phosphate luminescent material, discussed the reaction solution pH, the solution of the complexing agent is ethylenediamine tetraacetic acid (EDTA), and sodium citrate The impact of the amount for the reaction of the morphology of the final product. The effects of the doping ion of Ce3, Ce3 and Tb3 LaPO4 micromorphology. Under hydrothermal conditions, affecting the evolution of the law of the system factors and morphology of nanoparticles morphology and spectral properties of their luminescent properties were studied. The results show that under acidic conditions synthetic nowadays LaPO4.LaPO4: Ce3 and LaPO4: Ce3, Tb3 (?) Within nanoparticles have shown a larger aspect ratio, and the aspect ratio will be reduced under alkaline conditions. Under alkaline conditions, the presence of a complexing agent, LaPO4.LaPO4: Ce3 and LaPO4: Ce3, Tb3 (?) The aspect ratio of the nanoparticles increases. Ce3, Tb3 LaPO4 crystal doped into, with the increase of the ion species, its morphology becomes more irregular. Prepared LaPO4: Ce3 and LaPO4: Ce3 of Tb3 luminous material fluorescence spectra (PhotoLuminescence, PL), and light-emitting decay (Decay Times) to characterize the optical properties, the results show LaPO4: Ce3 and LaPO4: Ce3, Tb3 phosphor 5d- 4f (Ce3) 5D4-7Fj (j = 6-3) (Tb3) characteristic lines. Under laboratory conditions, by hydrothermal reaction apparatus amplification experiments, a the LaPO4 series of light-emitting material was prepared, the comparison of the amplified products with the enlarged front of the luminescent properties of the product, but also were compared under the conditions of preparation yield. Preparation of the hollow ball well to save rare earth materials and the Gd2O3: of Eu3 microspheres have a wide range of potential applications in biological fluorescence labeling, magnetic resonance imaging technology prospects. In this experiment, the carbon microspheres as the template, the co-precipitation agent urea was prepared by co-precipitation method of France and then calcined under a hollow light-emitting material Gd2O3: Ln (Ln = SM3, Eu3) micro-balls. Gd (OH) CO3 of precursor by a coprecipitation method is coated on the carbon microspheres, found that the effect of the size of the carbon microspheres coated have a greater impact, wherein, under the conditions of the water bath for 3h at 90 ℃ the carbon microspheres in the 300-500nm, the coated precursor showed better homogeneity, and a hollow light-emitting material Gd2O3: Eu3 microspheres exhibit good luminescence properties.

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