【作者】 邱娟； 陈晓；

【Author】 Juan Qiu;Xiao Chen;Key Laboratory of Colloid and Interface Chemistry,Shandong University,Ministry of Education;

【机构】 山东大学胶体与界面化学教育部重点实验室；

【摘要】 本文选取阳离子聚电解质（支化聚乙烯亚胺,PEI）和稀土杂多酸盐(Na₉(EuW₁₀O₃₆)·32H₂O,EuW₁₀),在水中构筑了发光增强的球形聚集体。研究了EuW10浓度一定时,该体系相行为和发光性能随PEI浓度的变化。结果表明:PEI上质子化的氨基与EuW10之间的静电相互作用,有效屏蔽了水分子的猝灭效应,使得聚集体具有更高的荧光强度、更长的荧光寿命和更高的量子产率。因PEI上氨基的质子化程度和EuW10上的带电荷量均受到溶液pH值的影响,该体系的聚集体形貌和发光性能具有pH刺激响应性。此外,该体系的荧光强度还具有对铜离子和高锰酸根离子的双重离子响应性,可定量检测这两种离子,从而拓宽了此类稀土发光材料在检测方面的应用。更多还原

【Abstract】 A cationic polyelectrolyte, branched polyethyleneimine（PEI）, and Eu-containing polyoxometalate, Na₉(EuW₁₀O₃₆)·32 H₂O(EuW₁₀), were used to construct luminescence enhanced spherical aggregates in water. The concentration of EuW₁₀ was fixed to study the change of both phase behavior and luminescence properties influenced by the concentration of PEI in the system. Owing to the electrostatic interaction between the EuW₁₀ and protonated amino group of PEI, the water molecules was effectively shielded resulting in increased fluorescence intensity, longer luminescence lifetime and higher quantum yield. The morphology and luminescence properties of the system have pH stimuli responsiveness. Copper ions and permanganate can strongly quenched the fluorescence which can quantitatively detect this two ions. The dual responsiveness could broaden the application of this type of rare earth luminescent materials in detection.更多还原