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报道了在溶胶 凝胶法制备的二氧化硅溶胶中共掺Ca2+,K+及Eu3+,复合凝胶在空气中经600℃热处理后,硅凝胶发生晶化并形成硅酸盐多晶结构,紫外激发下该复合凝胶发射强蓝紫色荧光。荧光光谱表明掺杂Eu3+已变成相应的还原态Eu2+或[(Eu3+)-],Eu3+还原与凝胶晶化密切相关。相对于基质中硅,凝胶中Eu2+荧光猝灭浓度约为0.28at%;Eu2+间的激化能按库仑作用机理传递,传递距离约为1 55nm。
Reported the co-doped Ca2 +, K + and Eu3 + in silica sol prepared by sol-gel method. After the composite gel was heat-treated at 600 ℃ in the air, the silica gel crystallized and formed silicate polycrystal structure. The composite gel emits intense blue-violet fluorescence. Fluorescence spectra showed that the doped Eu3 + has been reduced to the corresponding reduced Eu2 + or [(Eu3 +) -]. The Eu3 + reduction is closely related to the gel crystallization. The Eu2 + fluorescence quenching concentration in the gel was about 0.28at% with respect to that in the matrix. The excitation energy of Eu2 + was transferred by Coulomb interaction mechanism with a transmission distance of about 155 nm.