【摘要】 以Cs2CO3修饰的Al电极作为反射阴极制备了高效倒置顶发射结构有机电致发光器件(ITOLED)。以八羟基喹啉铝(Alq3)作为发光层、MoO3修饰的Ag为半透明阳极时,器件的开启电压为3.6 V,发光效率和功率效率分别达到9.8 cd/A和3.4 lm/W。研究结果表明,Al/Cs2CO3为反射阴极的器件性能明显高于使用Mg∶Ag(4.2 V,8.6 cd/A,2.85 lm/W)和Al(5 V,5.5 cd/A,1.57 lm/W)作为反射阴极的倒置顶发射OLED器件。单电子器件研究结果证明,以Cs2CO3修饰的Al电极功函数明显低于Mg∶Ag和Al电极,具有更好的电子注入效果。因此,除去微腔效应外,Al/Cs2CO3为反射电极的ITOLED器件性能的提高主要归因于Al/Cs2CO3阴极的有效电子注入。更多还原

【Abstract】 Efficient inverted top-emitting organic light-emitting diode(ITOLED) using a thin Cs2CO3 layer modified Al as the reflective bottom cathode is demonstrated.With tris-(8-hydroxy-quinoline) aluminum(Alq3) as emitting layer and MoO3/Ag as semitransparent anode,the Al/Cs2CO3 based ITOLED shows a tune-on voltage of 3.6 V,luminance efficiency of 9.8 cd/A and 3.4 lm/W,which are much better than those(4.2 V,8.6 cd/A,2.85 lm/W) obtained from Mg∶Ag based ITOLED and those(5 V,5.5 cd/A,1.57 lm/W) obtained from bare Al based ITOLED.Electron-only devices research shows that a stronger electron-injection is obtained from Al/Cs2CO3 than Mg∶Ag and Al,which is attributed to the lower work function of Al/Cs2CO3 than Mg∶Ag and Al.The good performance of Al/Cs2CO3 based ITOLED is attributed to the efficient electron injection from the Al/Cs2CO3 cathode as well as a microcavity effect.更多还原