Applied Physics Letters, 10 November 2008
Appl. Phys. Lett. 93, 193306 (2008) (3 pages)
©2008 American Institute of Physics. All rights reserved. 
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Stacked white organic light emitting devices consisting of separate red, green, and blue elements
Xiangfei Qi,1 Michael Slootsky,1 and Stephen Forrest2 (a)
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
(Received: 11 October 2008; accepted: 18 October 2008; published online: 13 November 2008)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 
ext=(36±2)% at a current density of J=82 µA/cm2 and p=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
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