双层阴极结构BaO/Al聚合物电致发光器件电子注入的研究

Abstract

【中文摘要】 介绍了用双层阴极BaO/Al和发光层MEHPPV制成的聚合物电致发光器件(PLEDs),研究了绝缘层BaO对电子注入所起的作用.实验发现,BaO对电子的注入起到显著的促进作用,与直接用Al做阴极的器件对比,其发光亮度和效率分别提高了20倍和10倍,达到了1250cd/m2和0.4%.同时也研究了不同厚度的绝缘层BaO对电子注入的影响,随着厚度的增加,外部量子效率和亮度先增加后减少,存在一个约为1nm的最佳厚度.另外,国外用绝缘层LiF和CsF做成器件,与他们的实验结果对比,发现是绝缘层BaO增强了电子的注入,而不是BaO分解得到的金属Ba. 【英文摘要】 The effect of the bilayer cathode BaO/Al on electron injection in a polymer light-emitting diode (PLED) device is presented.The devices have a BaO/Al bilayer as a cathode and a MEH-PPV as a light-emitting layer.It is shown that in our experiments,the electron injection was improved by inserting the insulating layer BaO between Al and MEH-PPV.The luminance and efficiency were 20 and 10 times to the devices with single only Al as a cathode,reaching 1 250 cd/m2 and 0.4%.We also investigated the dependence of e...