【作者】 俞仙妙； 黄莉蕾； 付晏彬； 朱京平； 施申蕾；

【Author】 Yu Xian Miao Huang Li-lei Fu Yan-bin Zhu Jing-pingShi Sheng-lei( Photoelectron Research Division, China Jiliang University, Hangzhou, 310034, China; National Measuring Science Research Inst, Beijing China, Beijing, 100013, China; The key laboratory of Zhejiang University, Hangzhou, 310027, China.)

【机构】 中国计量学院光电子研究所； 浙江大学中心实验室；

【摘要】 用凝胶燃烧法制备Y2SiO5:Eu3+纳米荧光粉。X射线衍射实验发现,在1100℃以下烧结得到X1型物相,属单斜晶系,空间点群为P21/c;在1300℃以上烧结得到X2型物相,属单斜晶系,空间点群B2/b。研究了室温下样品在395nm紫外光激发下得到的发射光谱,发现纳米荧光粉的5D0→7F0峰相比体材料发生红移,而5D0→7F2峰相比体材料又出现蓝移,谱带明显加宽。随着烧结温度降低,荧光粉颗粒减小,5D0→7F2的跃迁峰强度回落,但5D0→7F1与5D0→7F4的跃迁峰强度变化不大。这预示着纳米荧光粉微结构的变化。Eu3+在Y2SiO5基质中占有两个不同的格位,不同的能级产生两套光谱致使峰数比退简并的峰数多.更多还原

【Abstract】 Nanocrystalline YiSiOsiEu3+ fluorescence powder was prepared by the glycine combustion synthesis. It is discovered on the basis of XRD research that the samples calcined at lower temperature than 1100℃ belong to a X1 type which is the monoclinic crystal and its space group is P21/c. But the samples higher calcining heat than 1300℃ belong to X2 type phase which is also monoclinic crystal and its space group is B2/b. The emission spectra of the sample excitated by the radiation at 395nm at the room temperature have been studied. It is found out that a peak corresponding to 5D0→7F0 of the nanocrystalline occurred Einstein shift compared a body material, but peak of 5D0→7F2 transport appears obviously blue shift compared body material. The width of the emission spectrum is obviously widened. The grain of fluorescent powder minishes and the intensity of the transition 5Do→7F2 falls along with the calcining heat falls. But the intensities of the transitions 5D0→7F1 and 5D0→7F4 change very little. This augurs the change on the microscopic structure. Eu3+ ions occupy two different locations in Y2SiO5 host lattice, which possess different energy levels. Two spectra caused more peak than number of the degenerate energy levels.更多还原