具有空穴传输基团的超支化聚合物发光材料的结构与光谱性质  

Structure and Properties of Hyperbranched Conjugated Polymer Light Emitting Materials with Hole Transporting Moieties

作　　者：贺庆国[1] 黄红敏[1] 蔺洪振[1] 白凤莲[1] 

机构地区：[1]中国科学院化学研究所分子科学中心有机固体实验室,北京100080

出　　处：《发光学报》2003年第5期469-472,共4页Chinese Journal of Luminescence

基　　金：国家自然科学基金(90101025;50083002);国家"973"计划(2002CB613401);中国科学院创新工程基金资助项目

摘　　要：利用A2+B3反应,合成了带有空穴传输基团———三苯胺为联接单元,以1,3,5 三苯基苯为核的超支化聚合物(TPA TPP),并对这类聚合物的合成方法、结构、光物理性质进行了系统的研究。通过溶剂效应观察到了TICT(分子内电荷转移态),发射谱为宽而无结构的带谱,且发射波长随溶剂极性的增大而明显红移。因而可利用此特性来调节发光波长。研究结果表明,以三苯基苯为核,引入三苯胺基团作为连接基团,加大了空间位阻,使由溶液到固体膜状态的发射光谱红移减小。Conjugated polymers have attracted much interest in the last several years for their versatilities and potential application in lightemitting devices. Hyperbranced polymers have been intensively investigated recently due to their good solubility, processability, tunable physical and chemical properties and easy synthesis by called onepot reaction. Our aim was to synthesize hyperbranched conjugated polymers combining the merits of both dendrimerlike structure and linear conjugated units. In order to improve holetransporting ability of the material, triphenylamine was introduced into the polymer as connecting units. With triphenylbenzene as cores, a novel hyperbranched polymer (TPATPP) was synthesized based on A2+B3 reaction. The synthetic method, molecular structure and photophysical properties were investigated systematically. TPATPP showed good solubility, filmperforming property and high thermal stability. The polymer was synthesized with molecular weight of 1 700; the relative low value was related to the Wittigreaction used in the synthesis and the large steric hindrance of the branches. Due to the electrondonating triphenylamine moieties, it would be expected that the twisted intramolecular charge transfer state (TICT) exist at the excited state, which was evidenced by the solvent effect of polymer fluorescent spectra. TPATPP showed a broad and structureless emission band, and the peak position of the band red shifted with the increase of solvent polarity, the way of tuning emission wavelength of the material by simply changing the environment of TPATPP distributed may be provided. Fluorescent spectra of TPATPP showed that there was a redshift of 10nm only from dichloromethane solution to thin film, which was much smaller than those of the linear conjugated polymers (normally larger than 50nm). The reason may be due to the large steric hindrance caused by triphenylbenzene and triphenylamine. Our results exhibited that by introducing groups with large s

关 键 词：超支化共轭聚合物 空穴传输基团 三苯基苯 分子内电荷转移态 TICT 空间位阻 光谱红移 

分 类 号：TN383.1[电子电信—物理电子学] O482.31[理学—固体物理]