以ILTO为阳极的高效有机电致发光器件

摘要

OLEDs were fabricated with a structure of anode (ILTO or ITO)/NPB (70 nm)/Alq3 (60 nm)/LiF (1 nm)/Al (100 nm). NPB and tris(8-hydroxyquinoline) aluminum (Alq3) were used as hole transport layer and light emitting layer, respectively. A buffer layer of lithium fluoride (LiF) capped with aluminum ( Al) was used as a cathode. Comparing with ITO-anode device, the luminance, current efficiency, power efficiency, and external quantum efficiency ( EQE) are obviously enhanced in ILTO-anode device. Simultaneously, the turn-on voltage (2. 1 V) is decreased in combination with a better rectifying behavior. The significant improvement in the EL performance indicates that the high-work-function ILTO anode can not only lower the hole-injection barrier, but also leads to a better charge balance in OLEDs. The effects of high work function afford more opportunities to develop and optimize the performance of organic photoelectric devices, and facilitate the fabrication process of devices.%以高功函数的掺杂钛酸镧的氧化铟薄膜(ILTO)及氧化铟锡(ITO)作为阳极,制备了Glass/anode/NPB/Alq3/LiF/Al结构的有机电致发光器件.得益于ILTO较好的掺杂性、低的表面粗糙度、高的可见光透过率以及高的有效功函数,以ILTO为阳极的有机电致发光器件的开路电压得到降低,最高亮度、电流效率、功率效率以及外量子效率均获得了成倍的提高.研究结果表明,ILTO是一种潜在的光学窗口材料,有望在各种光电器件中得到广泛的应用.