【作者】 熊志军；

【导师】 杨志平；

【作者基本信息】 河北大学 ， 光学工程， 2007， 硕士

【摘要】 制备硅酸盐发光材料的传统方法是固相法,该方法存在合成温度高、反应时间长,荧光粉的颗粒度不易控制等缺点。而溶胶—凝胶法由于能很好地解决上述问题,越来越受到人们的关注,目前已经成为发光材料制备技术中的研究热点。本文研究了溶胶—凝胶法(Sol-Gel)制备Ca3SiO5:Eu2+发光材料的工艺条件,系统讨论了PH值、溶剂、灼烧温度和灼烧时间等对样品发光性能的影响。结果表明,在Eu2+掺杂浓度为0.5%,灼烧温度为1100℃,灼烧时间为4h的条件下可以得到性能优良的荧光粉。对样品的X射线衍射(XRD)、扫描电镜(SEM)分析表明,其晶体结构为纯相Ca3SiO5,晶粒尺度在30 nm左右。而从样品的发射光谱和激发光谱可以看出,Ca3SiO5:Eu2+的发射光谱是峰值位于505 nm的宽带谱,激发谱峰值位于374 nm,说明这种材料是一种很好的近紫外激发的绿色荧光粉。利用溶胶—凝胶法进一步合成了Sr2SiO4:Eu3+红色和Sr2SiO4:Bi3+蓝色荧光粉,对样品进行X射线衍射分析和发光特性研究,确定了掺杂浓度以及各组分含量对样品发光特性的影响情况。更多还原

【Abstract】 As a traditional method for preparing silicate phosphors, the solid-state reaction method has many disadvantages, such as high composite temperature, long reaction time and difficult in controlling the crystal grains size of phosphor. Sol-gel method can solve the above problems perfectly, thus it has gained a great deal of attention and been a hot spot in preparing phosphor materials.In this paper, the Ca3SiO5:Eu2+phosphors were synthesized by sol-gel method and the influence of different procedure conditions on its luminescent properties were studied such as PH value, kinds of solvent, doped concentration, sintered temperature and sintered time. The result indicated that when the concentration of Eu2+is 0.5%, the sintered temperature is 1100℃and the sintered time is 4h, the high performance phosphor can be obtained. The crystal size of the phosphor is about 30 nm through the analysis of XRD and SEM. It can be seen that the emission spectra is a disymmetric broad spectra at 505 nm and the excitation peak located at 374 nm which shows the material is a good green phosphor exciting by ultraviolet chip.The Sr2SiO4:Eu3+ and Sr2Si04:Bi3+ were fabricated by sol-gel method. The x-ray diffraction patterns and the luminescent properties were studied. And the effect of the concertration of Eu3+,Bi3+ and the ratio of elements on the luminescent properties were investigated.更多还原