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Stacked white organic light emitting devices consisting of separate red, green, and blue elements

Appl. Phys. Lett. 93, 193306 (2008); doi:10.1063/1.3021014

Published 13 November 2008

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Xiangfei Qi,1 Michael Slootsky,1 and Stephen Forrest2
1Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
2Departments of Electrical Engineering and Computer Science, Physics, and Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
We demonstrate a white organic light-emitting device where individual red, green, and blue (R, G, and B) phosphorescent organic light-emitting devices are vertically stacked and electrically interconnected by a compound MoO3/Li-doped charge generation layer. For the order of B, G, and R cells positioned relative to the indium tin oxide anode, the device yields a peak total external quantum efficiency (EQE) and power efficiency (PE) of etaext=(36±2)% at a current density of J=82  µA/cm2 and etap=21±1  lm/W at J=17  µA/cm2, respectively. The EQE and PE of the device roll off to (32±2)% and 13±1  lm/W at 1000  cd/m2, corresponding to J=2  mA/cm2. At this luminance, the device shows Commission Internationale de L'Eclairage chromaticity coordinates of (0.45, 0.36) and a color rendering index of 63. ©2008 American Institute of Physics
History: Received 11 October 2008; accepted 18 October 2008; published 13 November 2008
Permalink: http://link.aip.org/link/?APPLAB/93/193306/1
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KEYWORDS and PACS

Keywords
PACS
  • 85.60.Jb
    Light-emitting devices
  • YEAR: 2008

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ISSN:
0003-6951 (print)   1077-3118 (online)
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