采用柔性连接方法改善树枝状铂(II)配合物的电致发光性能

项目名称： 采用柔性连接方法改善树枝状铂(II)配合物的电致发光性能

项目编号： No.21204083

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 高分子科学

项目作者： 李慧

作者单位： 中国科学院长春应用化学研究所

项目金额： 25万元

中文摘要： 铂(II)配合物是一类在电致发光器件中具有潜在应用价值的磷光材料，然而其平面配位构型引起的分子间轴向相互作用常常导致发光分子间自淬灭，因此抑制分子间相互作用应该是改善其发光性能的有效手段。采用树枝状配体屏蔽发光核的方法能够有效避免自淬灭效应，本课题组已合成的、通过共轭刚性基团连接树枝与发光核的铂(II)配合物证实了该方法的有效性，但对发光核的屏蔽作用远未达到预期效果。基于此，本项目提出采用柔性连接发光核和外围树枝基团的方法改善树枝状铂(II)配合物的发光性能。调节柔性链的长短、数量、原子种类以及与发光核的键连位置等，合成树枝状配体和相应的铂(II)配合物，表征配合物的发光性能，根据研究结果确定优选的柔性连接方法。通过本项目的实施，期望利用柔性连接外围树枝基团与发光核的新方法，有效抑制分子间相互作用，避免铂(II)配合物自淬灭效应，获得综合性能优异的树枝状蓝光和红光铂(II)配合物。

中文关键词： 铂(II)配合物；柔性连接；树枝状分子；分子间相互作用；电致发光

英文摘要： Pt(II) complexes as phosphorescent materials have been attracting wide spread interest because of the potential applications in electroluminescent devices, however, the axial intermolecular interaction always leads to self-quenching between emissive molecules due to their square-planar coordination geometry. The effect can be avoided by shielding the light-emitting core with dendrimeric ligands, which has been confirmed in our previous work. But the shielding function is far from our expected while connecting dendrons and core with conjugated rigid groups. Based on the results, the novel strategy that the light-emitting core and dendrons are joined together using the flexible connection would be proposed to synthesize the Pt(II) dendrimers in the project. The dendrimeric ligands would primarily be synthesized by adjusting the length, branch number, atomic species and bonded position of the flexible chain. The corresponding dendrimeric Pt(II) complexes are then prepared and fully characterized including their structures, the photophysical and electrochemical properties. The electroluminescent performance is also evaluated using rational device structure. The optimal flexible connection methods would be ascertained according to the obtained results. The final purpose of this project is to find the methods that can

英文关键词： Pt(II) complexes；flexible connection；dendrimer；intermolecular interaction；electroluminescence