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采用溶胶-凝胶法制备了纳米微晶X1-Y2SiO5∶Eu，研究了室温和15K下的光致发光特性.透射电子显微镜的测量结果表明，样品的平均粒径为50nm.通过低温下的格位选择激发，分别得到X1-Y2SiO5∶Eu中两种格位的Eu3+离子各自的光致发光光谱，确定了谱峰位置.在格位选择激发下，两种格位的发光衰减均呈很好的单指数关系，5DNanometric Scale X1-Y2SiO5∶Eu was prepared by sol-gel method with particle size about 50nm.The optical properties of the sample were investigated.Its luminescence spectra were recorded at room temperature and 15K using site selective excitation by a dye laser in addition to conventional UV excitation.Site selective excitation gave two sites for the Eu3+ ion in X1-Y2SiO5.These two sites differ significantly from each other as stated by their emission spectra.Wavelengths of the 5D0→7F0—4 transitions of the two sites were tabulated.Lifetimes of the 5D0 energy level were also measured. They are 3.00ms (site 1) and 2.18ms (site 2).
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