Abstract：Alkali earth chlorosilicate of the type Sr4-xCaxSi3O8Cl4 was synthesized through the high temperature solid state method. According to the Van Uitert experimental equation, luminescence properties and crystal-lattice environment of Eu2+ in Sr4-xCaxSi3O8Cl4 crystal were discussed. The possibilities of two Eu2+ emission centers, viz. blue and greenish-yellow centers, were found and their corresponding relationships with spectra were also discussed. When the doping amount of calcium(x) varied between 0 and 0.5, Ca2+ ions were embedded in the host lattice of Sr4Si3O8Cl4, and the luminescence of blue center, which was ascribed to the emission of Eu2+ that substituted the octa-coordination Sr2+ sites, dominated and showed blue-green luminescence. Sr4-xCaxSi3O8Cl4：yEu2+ exhibited greenish-yellow luminescence when the range of x was between 0.5 and 2. This was due to the fact that the Eu2+ emission originated from the formation of an impurity-trapped exciton state. Greenish-yellow emission center was located in the impurity-trapped exciton state which was the lowest excited state of this system, and the Eu2+ emission was at long wavelengths，and a large Stokes shift was observed.
孙家跃，夏志国，杜海燕. (Sr, Ca)4Si3O8Cl4基质中Eu2+的发光特性研究[J]. 光谱学与光谱分析, 2005, 25(11): 1760-1763.
SUN Jia-yue, XIA Zhi-guo, DU Hai-yan. Study on Luminescence Properties of Eu2+ in (Sr, Ca)4Si3O8Cl4 Host Lattice. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(11): 1760-1763.
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