有机电荷产生层对叠层磷光OLED器件性能的影响

Effect of Organic Charge Generation Layer on Optoelectronic Performance of Tandem Phosphorescent OLED

摘要:

采用C60/pentanece作为非掺杂电荷产生层,并在其两边各插入Al和MoO3薄层作为C60和pentanece的电子注入层和空穴注入层,在此基础上制备了结构为ITO/NPB/mCP∶8wt%Ir(ppy)3/TPBi/Al/C60/pentanece/MoO3/NPB/mCP∶8wt%Ir(ppy)3/TPBi/Cs2CO3/Al的双发光单元叠层绿色磷光有机发光器件(OLED)。实验表明,增加Al和MoO3电荷注入层,可有效改善有机电荷产生层的电荷注入能力,提高叠层OLED器件的发光亮度和电流效率。叠层器件的启亮电压明显低于单个器件的1/2,但电流效率是单层器件的两倍以上。当Al/C60/pentanece/MoO3的厚度分别是3、15、25和1nm时,叠层OLED器件具有最佳的光电性能,其最大亮度和最大电流效率分别是7 920.0cd/m2和16.4cd/A。

Abstract:

In this report, C60/pentacene was applied as the nondoped charge generation layer (CGL) to achieve excellent performance of TOLEDs with using Al and MoO3 layer as the electron and hole injection layers, respectively. Green phosphorescence TOLEDs with the structure of ITO/NPB/mCP∶Ir(ppy)3/TPBi/Al/C60/pentanece/MoO3/NPB/mCP∶Ir(ppy)3/TPBi/Cs2CO3/Al were fabricated. Experimental results show that inserting Al and MoO3 layer can effectively increase the charge injection capacity of organic CGL, and improve the luminance and current efficiency of TOLEDs. The turnon voltage of TOLEDs is much lower than that of singleunit device, but the current efficiency is more than 2 times as that of the singleunit device. TOLEDs can exhibit excellent photoelectric performance when the thickness of Al/C60/pentanece/MoO3 is 3, 15, 25 or 1nm. The maximum luminance and current efficiency are 7920.0cd/m2 and 16.4cd/A, respectively.