聚合物电致发光器件的电流限制机制

以共轭聚合物聚(2-甲氧基-5-(2′-乙基-己氧基)-1,4-对苯乙炔)为发光材料制备复合阴极结构（LiF/Al）的聚合物电致发光器件.针对不同发光层厚度和阴极修饰层厚度的器件进行电流-电压测试,研究引起器件电流限制的机制.结果表明,单金属阴极器件的电流特性为载流子输运体限制机制；当阴极修饰层（LiF）厚度为2 nm左右时,电流特性以载流子注入限制为主；而当阴极修饰层为其他厚度时,2种限制机制同时存在.对具有不同阴极修饰层厚度的器件的电流-电压特性提出理论模型,模拟结果与试验数据较为符合.

Current limitation mechanism of polymer light-emitting devices

Conjugated polymer (poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene),MEH-PPV) based polymer light-emitting devices (PLEDs) were fabricated with composite cathode (LiF/Al).The current-voltage characteristics of the devices with different thickness of LiF layer and MEH-PPV layer were measured and analyzed in order to investigate the current limitation mechanism of PLEDs.The results show that the charge carrier transport limitation exhibits in the case of single metal cathode,while the charge carrie...