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

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.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [3] ;  [4] ; ;  [5]
  1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022 (China)
  2. (United States)
  3. Tech. Univ. Dresden, Inst. Angew. Photophys., D-01062 Dresden (Germany)
  4. Department of Electrical Engineering and Computer Sciences, College of Engineering, South Dakota State University, Brookings, South Dakota 57007 (United States)
  5. 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)
Publication Date:
OSTI Identifier:
22273430
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COLOR; DOPED MATERIALS; ENERGY LOSSES; LIGHT EMITTING DIODES; QUANTUM EFFICIENCY; TRIPLETS; VISIBLE RADIATION