主链含电子传输型基团的可溶性PPV发光特性研究

Study on the Electroluminescent Performance of the Soluble PPV Containing Electron-Transporting Group

经由Ｗｉｔｉｇ－Ｈｏｒｎｅｒ反应合成了一种可溶的ＰＰＶ主链含有电子传输基团的新型结构电子聚合物。该低聚物的Ｍｗ＝１０００、Ｔｄ＝２７０℃，可溶于氯仿和四氢呋喃。构造了最简单的三明治式电致发光器件ＩＴＯ／Ｏ－ＰＰＶ（８０ｎｍ）／Ａｌ，其电致发光和光致发光光谱基本一致。该器件与同样结构的ＰＰＶ相比其ＥＬ表现出在５０９ｎｍ处单一的宽峰，而ＰＰＶ的器件为５２０ｎｍ和５５０ｎｍ的双峰。另外由于主链上含有电子传输特性的二唑基团及聚合物材料的分子量较小，器件的量子效率达到０．１３％。

A kind of soluble novel structure electron-polymer, PPV containing electron-transporting group on the main chain(O-PPV), was synthesized according to the WittigHorner mechanism. The oligo-polymer with the 5BXM w=1 000 T d=270 can be soluble in chloroform and tetrahydrofuran. The kind of simple sandwich device ITO/O-PPV(80 nm)/Al was fabricated, the electroluminescent(EL) spctra produced in the device are essentially the same. Compared with the analogous single-layer device constructed with PPV(ITO/PPV/Al), the EL spectrum of O-PPV is a broad peak at max=509 nm, however PPV emits two peaks at =520 nm and 550 nm(shoulder) respectively. The quantum efficiency(0.13%) of the device ITO/O-PPV/Al is about five times than that of the device ITO/PPV/Al, due to the introducing the electron-transporting groupoxadiazole unit in the main chain of PPV.