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

F. X. Zang, T. C. Sum, A. C.H. Huan, T. L. Li, W. L. Li, Furong Zhu

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58 Citations (Scopus)

Abstract

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 cdA) 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 cdA). 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.

Original languageEnglish
Article number023309
Number of pages3
JournalApplied Physics Letters
Volume93
Issue number2
DOIs
Publication statusPublished - 14 Jul 2008

Scopus Subject Areas

  • Physics and Astronomy (miscellaneous)

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