含噻吩单元的间苯共聚物及其电致发光性能

采用NiCl2催化的Yamamoto缩聚反应将不同比例的含噻吩单体与间苯单体共聚,合成了聚(5-(2-乙基己氧基)-1,3-苯撑-co-(2,5-二苯撑-4-基-噻吩))(PmP-DPT),并测试了4种不同比例共聚物的紫外-可见光吸收光谱,光致发光光谱和LED器件的电致发光光谱,系统地表征了共聚物的光电性能。结果表明,噻吩的加入形成了新的发光中心,实现了从间苯链段到含噻吩发光中心的有效能量转移,当噻吩摩尔分数约为1%时,可得到效率为0.47%的色坐标(CIE)为0.17和0.13的蓝光PLED器件。当噻吩摩尔分数为10%时,可得到效率为2.59%的色坐标(CIE)为(0.21,0.36)的蓝绿光PLED器件。

Synthesis and Blue Electroluminescent Properties of Copolymers Derived from P(m-phenylene) and Thiophene

A series of m-phenylene based copolymers containing a small fraction of thiophene derivative moieties poly[5-(2-ethylhexyloxy)-1,3-phenylene-co-(2,5-diphenylene-4-yl-thiophene)](PmP-DPT) was synthesized by means of Yamamoto coupling reaction.These copolymers were characterized by UV-Vis absorption spectra and photoluminescent spectra.Polymer light-emitting diodes(PLED) were fabricated to investigate the electroluminescent properties.It was found that the thiophene derivative moieties became the new emitter via efficient energy transfer from the poly(m-phenylene) segments.With the increase of its feed ratio,the photoluminescence spectra showed red-shift.CIE(0.17,0.13) can be obtained for PmP-DPT1 devices with a quantum efficiency of 0.47%,while CIE(0.21,0.36) can be obtained for PmP-DPT10 devices with a quantum efficiency of 2.59%.