摘要
用高温固相反应合成了 CaSiO_3∶Bi,CaSiO_3∶Eu 和 CaSiO_3∶Eu,Bi 发光体。通过 X 射线粉末衍射、红外光谱、激发光谱和发射光谱等方法,研究了发光体的晶体结构、化学成键性和发光特性。CaSiO_3∶Bi 属于单斜晶系,具有硅灰石结构,其中 Bi^(3+)的发光位于近紫外区的353nm。在 CaSiO_3∶Eu,Bi 中,Bi^(3+)对 Eu^(3+)有较强的敏化作用,适当增加 Bi^(3+)的含量,可提高 Eu^(3+)发射的强度比(R=I_(5D_0-~7F_1))/(I_(5D_0-~7F_2))增加 Eu^(3+)的含量可增强 Bi^(3+)对 Eu^(3+)的敏化效果。
The luminophors of silicates CaSiO_3:Bi,CaSiO_3:Eu and CaSiO_3:Eu,Bi were sy-nthesized and luminescence properties of Bi^(3+) and Eu^(3+) ions were studied.Crystal structures and chemical bondings of the luminophors and the effects andregularities of Bi^(3+) ions on the luminescence of Eu^(3+) ions were investigated.CaSiO_3:Bi has the structure of wollastonite-2 M and belongs to the monoclinic system.TheIR spectra have shown that there are the chemical bondings M—O—Si (M=Bi orEu) in the luminophors.The maximum wavelength of Bi^(3+) emission is situated at353 nm.Bi^(3+) ions can sensitize the Eu^(3+) ions in CaSiO_3:Eu,Bi.The intensity ratioR=I_(5D^5-0F_0)/I_(7D_2-7F_1)can be promoted by increasing the concentration of Bi^(3+) ions,and the sensitization effect of Bi^(3+) on Eu^(3+) can be improved by increasing the con-centration of Eu^(3+) ions.The experimental results show that the optimum synthesis conditions are prefiringat 950℃ and then firing twice at 1100℃ for 4 hours each time.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第3期350-353,共4页
Journal of Inorganic Materials
关键词
硅酸钙
铕
铋
发光
材料
Silicate
Luminescence
Inorganic material
Luminophor
