【摘要】 以高纯的 Eu₂O₃,金属 Bi,CaCO₃,Li₂CO₃以及 Si（OC₂H₅）₄（A.R.）为原料,采用溶胶-凝胶法,合成 CaO-SiO₂:Eu³⁺,Bi³⁺。合成温度较高温固相反应法低300—400℃。最佳组成为0.89CaO-SiO₂:0.045Eu³⁺,0.01Bi（3+）。利用红外光谱、X 射线粉末衍射谱、热重及差热分析研究了由凝胶向发光晶体的转变过程。通过激发光谱和发光光谱的研究,发现 Bi³⁺离子向 Eu³⁺离子的能量转移是十分有效的。更多还原

【Abstract】 The luminophors CaO-SiO₂:Eu³⁺,Bi³⁺were synthesised by sol-gel method.The reactants are Eu²O₃,Bi,CaCO₃,Li₂CO₃and Si（OC₂H₅）₄.In the sol-gel method the reac-tion temperature is lower than that in solid phase reaction.The optimum chemical composi-tion of the luminophor is 0.89CaO-SiO₂:0.045Eu³⁺,0.01Bi³⁺with the monoclinic system.Thetransfer process from the gel to crystal was studied by TG-DTA,XRD and IR spectra.Ac-cording to the intensity ratio of ⁵D₀-⁷F₁ to ⁵D₀-⁷F₂ transition,it is known thatEu³⁺ ions lie in the nonsymmetrical site in the host lattice.Owing to the face that the emis-sion peak of Bi³⁺ ions in CaO-SiO₂:Bi³⁺ and the absorption peak of Eu³⁺ ions inCaO-SiO₂:Eu³⁺ are overlapped,the energy transfer happens from Bi³⁺ to Eu³⁺ ions.更多还原