Efficiency enhancement and voltage reduction in white organic light-emitting devices
- 14 May 2007
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 90 (20)
- https://doi.org/10.1063/1.2740482
Abstract
High-efficiency and low operating voltage fluorescent white organic light-emitting devices (WOLEDs) have been realized by doping either 4,7-diphenyl-1,10-phenanthroline (BPhen) or N, N′ -bis(1-naphthyl)- N, N′ -diphenyl- 1, 1′ -biphenyl- 4, 4′ -diamine (NPB) into the blue light-emissive layer. Devices doped with BPhen (or NPB) exhibited a maximum power efficiency of 8.7 lmW (7.6 lmW), about 74% higher than that of the reference device (5.0 lmW). Such performance improvement is ascribed to the incorporation of a better electron-transporting layer and an improved carrier transport through the emissive layer by mixing with the higher drift mobility materials. It provides a simple and general means to improve the power efficiency of WOLED. © 2007 American Institute of Physics.link_to_subscribed_fulltexKeywords
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