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

doi:10.1063/1.2955527

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

Department of Physics

Research output: Contribution to journal › Journal article › peer-review

64 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 language	English
Article number	023309
Number of pages	3
Journal	Applied Physics Letters
Volume	93
Issue number	2
DOIs	https://doi.org/10.1063/1.2955527
Publication status	Published - 14 Jul 2008

Scopus Subject Areas

Physics and Astronomy (miscellaneous)

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

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.",

author = "Zang, {F. X.} and Sum, {T. C.} and Huan, {A. C.H.} and Li, {T. L.} and Li, {W. L.} and Furong Zhu",

note = "Funding Information: This work is supported in part by a grant (042 101 0014) from the Agency for Science, Technology and Research ( A * STAR ) , Singapore. The authors are extremely grateful to Dr. Zhu Furong for the fruitful discussions and contributions to this work. ",

year = "2008",

month = jul,

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doi = "10.1063/1.2955527",

language = "English",

volume = "93",

journal = "Applied Physics Letters",

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T1 - Reduced efficiency roll-off in phosphorescent organic light emitting diodes at ultrahigh current densities by suppression of triplet-polaron quenching

AU - Zang, F. X.

AU - Sum, T. C.

AU - Huan, A. C.H.

AU - Li, T. L.

AU - Li, W. L.

AU - Zhu, Furong

N1 - Funding Information: This work is supported in part by a grant (042 101 0014) from the Agency for Science, Technology and Research ( A * STAR ) , Singapore. The authors are extremely grateful to Dr. Zhu Furong for the fruitful discussions and contributions to this work.

PY - 2008/7/14

Y1 - 2008/7/14

N2 - 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.

AB - 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.

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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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