Band Alignment at Anode/Organic Interfaces for Highly Efficient Simplified Blue-Emitting Organic Light-Emitting Diodes

被引：30

作者：

Liu, Zhiwei ^{[1
]}

Helander, Michael G. ^{[1
]}

Wang, Zhibin ^{[1
]}

Lu, Zhenghong ^{[1
]}

机构：

[1] Univ Toronto, Dept Mat Sci & Engn, Toronto, ON M5S 3E4, Canada

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 39期

基金：

加拿大自然科学与工程研究理事会;

关键词：

INDIUM-TIN-OXIDE; SURFACE MODIFICATION; PLASMA TREATMENT; NICKEL-OXIDE; SINGLE-LAYER; DEVICES; PERFORMANCE;

D O I：

10.1021/jp105782w

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Efficient simplified blue-emitting phosphorescent organic light-emitting diodes (OLEDs) were fabricated with a nickel oxide (Ni2O3) or molybdenum oxide (MoO3) modified indium tin oxide (ITO) anode. The maximum current efficiency of device anode/bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium (FIrpic)/FIrpic:1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi)/LiF/Al was increased from 3.6 cd/A with ITO anode to 22.0 and 23.6 cd/A for Ni2O3 and MoO3 modified ITO anodes, respectively. Moreover, the maximum current and power efficiencies of another bilayer device ITO/MoO3/FIrpic:4,4'-N,N'-dicarbazole-biphenyl (CBP)/FIrpic:TPBi/LiF/Al were as high as 49 cd/A and 48 lm/W, respectively. Photoelectron spectroscopy measurements were employed to investigate the electronic structure of the anode/organic interfaces. Results show that the band alignment at the oxide/organic interface plays a critical role in these simplified blue devices.

引用

页码：16746 / 16749

页数：4

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