Using interlayer step-wise triplet transfer to achieve an efficient white organic light-emitting diode with high color-stability

Journal Article · Mon May 12 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4876215· OSTI ID:22273430

Wang, Qi ^[1]; Ma, Dongge; Ding, Junqiao; Wang, Lixiang ^[1]; Leo, Karl ^[2]; Qiao, Qiquan ^[3]; Jia, Huiping; Gnade, Bruce E. ^[4]

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1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022 (China)
2. Tech. Univ. Dresden, Inst. Angew. Photophys., D-01062 Dresden (Germany)
3. Department of Electrical Engineering and Computer Sciences, College of Engineering, South Dakota State University, Brookings, South Dakota 57007 (United States)
4. Department of Materials Science and Engineering and Erik Jonsson School of Engineering and Computer Science, University of Texas at Dallas, Richardson, Texas 75083 (United States)

An efficient phosphorescent white organic light emitting-diode with a red-green-blue tri-emitting-layer structure is reported. The host of the red dopant possesses a lower triplet-energy than the green dye. An interlayer step-wise triplet transfer via blue dye → green dye → red host → red dye is achieved. This mechanism allows an efficient triplet harvesting by the three dopants, thus maintaining a balanced white light and reducing energy loss. Moreover, the color stability of the device is improved significantly. The white device not only achieves a peak external quantum efficiency of 21.1 ± 0.8% and power efficiency of 37.5 ± 1.4 lm/W but shows no color shift over a wide range of voltages.

• OSTI ID: 22273430
• Journal Information: Applied Physics Letters, Vol. 104, Issue 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COLOR
DOPED MATERIALS
ENERGY LOSSES
LIGHT EMITTING DIODES
QUANTUM EFFICIENCY
TRIPLETS
VISIBLE RADIATION