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According to the Van Uitert experimental equation, crystal-lattice environment of Eu~(2+) in the Sr_4Si_3O_8Cl_4 crystal was discussed. By adding Mg~(2+) to the host lattice, Sr_(4- x )Mg_ x Si_3O_8Cl_4∶Eu~(2+) was synthesized and the emission peak shifted from blue-green (488 nm) to blue-violet (411 nm) with the increase of amount of the magnesium which replaced the strontium. By analyzing the spectra of Sr_(4- x )Mg_ x Si_3O_8Cl_4∶Eu~(2+) the two Eu~(2+) emission centers were found because of the change of crystal-lattice environment in the host and the crystal structure was obtained by X-ray diffraction data.
According to the Van Uitert experimental equation, crystal-lattice environment of Eu ~ (2+) in the Sr_4Si_3O_8Cl_4 crystal was discussed. By adding Mg ~ (2+) to the host lattice, Sr_ (4- x) Mg_xSi_3O_8Cl_4:Eu ~ (2+) was synthesized and the emission peak shifted from blue-green (488 nm) to blue-violet (411 nm) with the increase of amount of the magnesium which replaced the strontium. By analyzing the spectra of Sr_ (4- x) Mg_xSi_3O_8Cl_4:Eu ~ (2+) the two Eu ~ (2+) emission centers were found for the change of crystal-lattice environment in the host and the crystal structure was obtained by X-ray diffraction data.