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Reduced efficiency roll-off in phosphorescent organic light emitting diodes at ultrahigh current densities by suppression of triplet-polaron quenching

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6 Author(s)
Zang, F.X. ; Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore ; Sum, T.C. ; Huan, A.C.H. ; Li, T.L.
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High-performance phosphorescent organic light emitting devices with reduced efficiency roll-off at ultrahigh current densities were realized. The devices were Ir(ppy)3-based phosphorescent organic light emitting diodes that employed 1,3-bis[2-(2,2-bipyridine-6-yl)-1,3,4-oxadiazo-5-yl]benzene as a high mobility electron transfer layer. The device’s brightness was enhanced while the efficiency roll-off was reduced. The device exhibits high current efficiency (21 cd/A) at high brightness (80 000 cd/m2), with a maximum luminescence of 136 000 cd/m2 at over 1 A/m2 (with an efficiency of 13 cd/A). This reduction in efficiency roll-off is attributed to the suppression of the triplet-polaron quenching rate through balancing the charge carrier ratio in the device.

Published in:

Applied Physics Letters  (Volume:93 ,  Issue: 2 )

Date of Publication:

Jul 2008

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