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Researches on the Preparation and Properties of Rare-earth Metal Ions Doped Silicate-based Luminescent Materials

Author: GeDaoWen
Tutor: TangWenMing
School: Hefei University of Technology
Course: Materials Engineering
Keywords: hydrothermal method sol-gel Sr2MgSi2O7 photoluminescence rare earth metal ions doping
CLC: O611.4
Type: Master's thesis
Year: 2009
Downloads: 164
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Abstract


Ce and Eu ions doped Sr2MgSi2O7 materials had been prepared by hydrothermal and sol-gel methods. Effects of synthesized methods, annealing temperature and time and concentrations of rare-earth metal ions on the structures and the luminescence properties of the silicate materials were studied using X-ray diffractometer （XRD）, transmission electron microscope （TEM） and spectrofluorometers （PL）. The results show that the Sr2MgSi2O7 phase can be obtained by the hydrothermal method operated at 220℃for 2d, and the content of the Sr2MgSi2O7 phase increases when increasing the reaction time to 6d. When the hydrothermal products were heat treated at 800℃, the mail phase of the products is Sr2MgSi2O7 with a little bit impurity, i.e., SrSiO3 phase. The products obtained employing the sol-gel method operated at 1000℃mainly consists of Sr2MgSi2O7 phase and small amount of Sr2SiO4 impurity. Studies on the photoluminescence patterns show that the wide UV emission band with the wavelength at 371nm exists in both Ce ions doped Sr2MgSi2O7 samples synthesized by the hydrothermal method and sol-gel method. This emission originates from the 5d-4f electron transition of Ce ions existing in the Sr ions place in the Sr2MgSi2O7 crystals. Two red emission bands with the wavelength at 590nm and 612nm excited at 395nm can be observed in the Eu ions doped Sr2MgSi2O7 samples obtained by sol-gel method, after heat-treated in air. However, only one emission band with the wavelength at 604nm with the excitation band at 403nm exists in the Eu ions doped Sr2MgSi2O7 samples obtained by hydrothermal method, after heat treated in air. In these two kinds of the samples obtained by the sol-gel and hydrothermal methods, a blue emission band with the wavelength at 465nm can be obtained when heat-treated in hydrogen atmosphere, and the intensity of this blue emission increases with the increasing of the heat treating temperature.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Chemical elements and inorganic compounds > Inorganic synthetic chemistry
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