Highly efficient tandem white organic light-emitting diodes based upon C60/NaT4 organic heterojunction as charge generation layer

被引：24

作者：

Chen, Yonghua ^{[1
]}

Tian, Hongkun ^{[1
]}

Chen, Jiangshan ^{[1
]}

Geng, Yanhou ^{[1
]}

Yan, Donghang ^{[1
]}

Wang, Lixiang ^{[1
]}

Ma, Dongge ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Grad Sch, Changchun 130022, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2012年 / 22卷 / 17期

基金：

中国国家自然科学基金;

关键词：

ENERGY-LEVEL ALIGNMENT; DEVICES; EXCITONS; BLUE; FLUORESCENT; EMISSION; MOBILITY; DIPOLE; LEDS;

D O I：

10.1039/c2jm30557g

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：

We present a high-efficiency tandem white organic light-emitting diode based upon a C-60/5,5 '''-bis( naphth-2-yl)-2,2': 5',2 '': 5 '',2 '''-quaterthiophene (NaT4) organic heterojunction as a charge generation layer. A maximum current efficiency, maximum power efficiency, and maximum external quantum efficiency of 111.3 cd A(-1), 50.5 lm W-1, and 38.7%, respectively, are obtained. More importantly, the efficiency roll-off is greatly improved with only a slight roll-off to 109 cd A(-1), 40.3 lm W-1, and 38% at a luminance of 1000 cd m(-2). Surprisingly, the electroluminescent spectrum is highly stable at all levels of luminance. Furthermore, our tandem device shows better operational stability than a tandem device employing a conventional charge generation layer. It is concluded that the excellent charge generation, transport, and extraction in the C-60/NaT4 organic heterojunction-based CGL is responsible for the high performances.

引用

页码：8492 / 8498

页数：7

共 49 条

[1] Quantum-Chemical Characterization of the Origin of Dipole Formation at Molecular Organic/Organic Interfaces [J].