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采用反相微乳液法,制备了稀土配合物EDTA-Eu掺杂的SiO2荧光粒子。x射线衍射分析表明所得粒子为非晶态,红外光谱分析表明EDTA中的羰基以双齿配位的形式与Eu3+配位。荧光光谱分析表明,在396nm处没有出现Eu3+的本征激发峰,而在310nm处出现一较强激发峰,表明配合物的激发谱由配体EDTA吸收能量引起,并将能量传递给Eu3+使之发出特征荧光,在310nm光激发下,发射波长位于615nm处,对应于Eu3+离子电偶极跃迁5D0-7F2,发射光谱中没有出现磁偶极跃迁5D0-7F1表明Eu3+的配合物中稀土离子处于不对称中心,掺杂的ED-TA-Eu与SiO2摩尔比在1:120～1:15之间时,随着EDTA-Eu的掺杂量的增加SiO2粒子的最大发射荧光强度成指数函数增长。
The rare earth complex EDTA-Eu doped SiO2 fluorescent particles were prepared by reverse microemulsion method. X-ray diffraction analysis showed that the obtained particles were amorphous, and the infrared spectrum analysis showed that the carbonyl group in EDTA was coordinated with Eu3 + in the form of bidentate coordination. Fluorescence spectroscopy analysis showed that there was no intrinsic excitation peak at 396 nm and a strong excitation peak at 310 nm, indicating that the excitation spectrum of the complex was absorbed by the ligand EDTA and transferred energy to Eu3 + Emitting fluorescence at 310nm, the emission wavelength is located at 615nm, corresponding to the dipole transition of Eu3 + ion 5D0-7F2, there is no magnetic dipole transition in the emission spectrum. 5D0-7F1 shows that the rare earth ions in Eu3 + complexes are not at When the molar ratio of ED-TA-Eu to SiO2 was 1: 120-1: 15, the maximum emission fluorescence intensity of SiO2 particles increased exponentially with the increase of the doping amount of EDTA-Eu.