主链含电子传输型团的可溶性PPV聚合物载流子传输特性研究

合成了一种聚苯撑乙烯撑(PPV)主链上含有电子传输基团的新型结构电子聚合物(O-PPV).该低聚物的M_w=1000,T_g=197℃,可溶于氯仿和四氢呋喃.单层O-PPV器件的发光效率约为单层PPV器件的5～8倍.进一步构造了结构为空穴传输特性材料/O-PPV和O-PPV/电子传输特性材料的双层器件来研究O-PPV的载流子传输特性,实验结果表明,O-PPV是一种具有明显两性载流子传输的特性材料.

Carrier Transport Characteristics of the Soluble PPV Polymer with Main Chain Containing Electron-Transporting Group

A kind of novel PPV derivative containing electron transporting group on the main chain(O PPV), was synthesized according to the WITTIG HORNER mechanism. This oligo polymer( M w= 1 000 , T g=470 K) is soluble in chloroform and tetrahydrofuran. Single layer device ITO/O PPV( 70 nm )/Al was fabricated, the electroluminescent(EL) spectra are essentially identical to photoluminescene(PL) spectrum. Compared with the quantum efficiency of the analogous single layer device constructed with PPV(ITO/PPV/Al), the device ITO/O PPV/Al is about five to eight times higher, which can be associated with the balanced carrier injection and transport owing to the attachment oxadiazole segment onto PPV mainchain. Two types of double layer devices were fabricated to study the carrier transport characteristic of OPPV. Our result showed O PPV has function both as electron transport layer and hole transport layer in double layer device, in other words OPPV has obvious bipolar transport characteristic.