期刊
JOURNAL OF APPLIED PHYSICS
卷 115, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4886179
关键词
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资金
- National Natural Science Foundation of China [51333007, 50973104]
- Ministry of Science and Technology of China (973 Program) [2013CB834805]
- Foundation of Jilin Research Council [2012ZDGG001, 20130206003GX, 201105028]
- CAS Instrument Project [YZ201103]
By adopting an ultra-thin non-doped orange emission layer sandwiched between two blue emission layers, high efficiency white organic light-emitting diodes (WOLEDs) with reduced efficiency roll-off were fabricated. The optimized devices show a balanced white emission with Internationale de L'Eclairage of (0.41, 0.44) at the luminance of 1000 cd/m(2), and the maximum power efficiency, current efficiency (CE), and external quantum efficiency reach 63.2 lm/W, 59.3 cd/A, and 23.1%, which slightly shift to 53.4 lm/W, 57.1 cd/A, and 22.2% at 1000 cd/m(2), respectively, showing low efficiency roll-off. Detailed investigations on the recombination zone and the transient electroluminescence (EL) clearly reveal the EL processes of the ultra-thin non-doped orange emission layer in WOLEDs. (C) 2014 AIP Publishing LLC.
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