烷基和烷氧基取代聚噻吩的合成、表征与光电性能

Fe(Ⅲ )氧化催化法合成了 4种聚噻吩衍生物 ,3 十二烷基聚噻吩 (Pat12 ) ,3 辛氧基聚噻吩 (Paot8) ,3,4 二 (十二烷基 )聚噻吩 (Pat12 12 )和 3 (十二烷基 )噻吩 3 (辛氧基 )噻吩共聚物 (CoPt12 o8) .发现这些衍生物易溶于多种常用有机溶剂 .用GPC法测定了各聚合物分子量 ,用1 H NMR法表征了各聚合物化学结构 .对比研究了这些聚合物紫外 可见吸收性能 ,光致发光性能和能隙 .对其电致发光性能进行测定的结果 ,得到了Pat12 ,Pat12 12和Paot8的电致发光光谱 .发射峰分别为 6 70nm ,5 6 0nm和 6 4 0nm .发光颜色分别为红色 ,黄色和红橙色 .聚合物的光电性能与主链电子结构有密切关系 .探讨了取代基种类和数量对聚合物能带结构 ,光电性能的影响 .

SYNTHESIS,CHARACTERIZATION,ELECTRO-OPTICAL PROPERTIES OF ALKYL AND ALKOXYL SUBSTITUTED POLYTHIOPHENES

Four derivatives of substituted polythiophenes(Pt) such as poly(3-dodecylthiophene) (Pat12), poly(3,4-didodecylthiophene) (Pat1212), poly(3-octoxylthiophene)(Paot8) and poly3-(dodecyl-co-octoxyl)thiophene](CoPt12-o8) have been synthesized using Fe(Ⅲ) as catalyst.All polymers exhibit excellent solubility in common organic solvents.Molecular weight and chemical structure of each polymer have been characterized by gel permeation chromatography (GPC) and 1H-NMR,respectively.The absorption and emission properties of polymers in chloroform solutions and spin-coating films have been studied.Except the film of Paot8,in the solution and the solid state,the polymers display different color from red to green photoluminescence.The absorption and emission maximum of Pat1212 was blue shifts more than that of Pat12 and absorption and emission maximum of Paot8 was more red shifts than that of Pat12.The band gapdata of four polymers were 2.2 eV,2.6 eV,2.1 eV and 2.1 eV,respectively,estimated from the edge of absorption spectra of spin-coating films.Single layer polymer LEDs(ITO/Polymer/Al) have been fabricated and it was found that the Pat12 emitted strong red light,the Paot8 emitted weaker red-orange light and the Pat1212 also emits weaker yellow light.The emitted wavelength was 670 nm,640 nm and 560 nm, respectively.No EL (electroluminescence) properties of CoPt12-o8 were found in our studies.