高等学校化学学报

高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (5): 567.

• 论文 • 上一篇    下一篇

Li2O-CaO-Gd2O3-SiO2:Eu,Bi体系的结构和发光性能之间的关系

田一光, 王传胜, 李彬   

  1. 吉林大学材料科学系, 长春, 130023
  • 收稿日期:1991-05-16 出版日期:1992-05-24 发布日期:1992-05-24
  • 通讯作者: 李彬

Relationship Between Luminescent Properties and Structures of Li2O-CaO-Gd2O3-SiO2 :Eu,Bi System

TIAN Yi-guang, WANG Chuan-sheng, LI Bin   

  1. Institute of Materials Science, Jilin University, Changchun, 130023
  • Received:1991-05-16 Online:1992-05-24 Published:1992-05-24

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摘要： 用X射线粉末衍射法研究了Li2O-CaO-Gd2O3-SiO2:Eu,Bi发光体系的物相组成随Gd2O3含量的变化,探讨了不同硅酸盐物种和结构对Eu3+和Bi3+发光特性的影响。结果表明,无Gd2O3组分时发光体是β-CaSiO4多晶体,当Gd2O3/SiO2比超过2.5%时,Ca2Gd8(SiO4)6O2和LiGd9(SiO4)6O2物相逐渐增加,当其成为主要物相时,EU3+发光呈数倍增强,这2种含钆物相的结构既利于EU3+的红光发射又利于敏化剂向激活剂传输能量,所形成的固熔体是优良的发光基质材料。

关键词: 发光材料, 稀土硅酸盐, 晶体结构

Abstract: The variations of phase components depending on the concentrations of Gd2O3 in the system of Li2O-CaO-Gd2O3-SiO2:Eu,Bi were studied by powder X-ray diffraction.It was investigated that the structures and species of silicates affect the luminescent properties of Eu(Ⅱ) ion and Bi(Ⅲ) ion.If Gd concentration is small, the product is β-Ca2SiO4.The phases Ca2Cd8(SiO4)6O2 and LiCd9(SiO4)6O2 appear and their contents increase with Gd2/O3 being 0.25 when the ratio Gd2O3/SiO2 is more than 2.5 wt% .The luminescence intensity of Eu3+ ion in the sample is five times that of Eu3+ ion in the sample with Gd2O3/SiO2 being 0.2.The structures of the two phases containing Gd favor both red emission of Eu3+ ion and energy transfer from sensitizer to activator.The solid solution formed by the two compounds is a better host material than single LiCd9(SiO4)6O2 phase.

Key words: Luminescent materials, Rare earth silicate, Crystal structure

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