Stable efficiency roll-off in phosphorescent organic light-emitting diodes

Sung Hyun Kim; Jyongsik Jang; Kyoung Soo Yook; Jun Yeob Lee

doi:10.1063/1.2836270

Stable efficiency roll-off in phosphorescent organic light-emitting diodes

Sung Hyun Kim, Jyongsik Jang, Kyoung Soo Yook, Jun Yeob Lee

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117 Scopus citations

Abstract

Origin of efficiency roll-off in phosphorescent organic light-emitting diodes was investigated with triplet mixed host devices and stable devices with little efficiency roll-off was developed. Efficiency roll-off was significant in the device with narrow recombination zone (RZ) and charge leakage out of emitting layer at high luminance was critical to efficiency roll-off. Efficiency roll-off could be reduced in triplet mixed host device with broad RZ and little charge leakage at high driving voltage. Triplet mixed host devices with an exciton blocking layer showed a quantum efficiency over 90% of maximum quantum efficiency at a luminance of 20 000 cd m2.

Original language	English
Article number	023513
Journal	Applied Physics Letters
Volume	92
Issue number	2
DOIs	https://doi.org/10.1063/1.2836270
State	Published - 2008
Externally published	Yes

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title = "Stable efficiency roll-off in phosphorescent organic light-emitting diodes",

abstract = "Origin of efficiency roll-off in phosphorescent organic light-emitting diodes was investigated with triplet mixed host devices and stable devices with little efficiency roll-off was developed. Efficiency roll-off was significant in the device with narrow recombination zone (RZ) and charge leakage out of emitting layer at high luminance was critical to efficiency roll-off. Efficiency roll-off could be reduced in triplet mixed host device with broad RZ and little charge leakage at high driving voltage. Triplet mixed host devices with an exciton blocking layer showed a quantum efficiency over 90\% of maximum quantum efficiency at a luminance of 20 000 cd m2.",

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AU - Kim, Sung Hyun

AU - Jang, Jyongsik

AU - Yook, Kyoung Soo

AU - Lee, Jun Yeob

PY - 2008

Y1 - 2008

N2 - Origin of efficiency roll-off in phosphorescent organic light-emitting diodes was investigated with triplet mixed host devices and stable devices with little efficiency roll-off was developed. Efficiency roll-off was significant in the device with narrow recombination zone (RZ) and charge leakage out of emitting layer at high luminance was critical to efficiency roll-off. Efficiency roll-off could be reduced in triplet mixed host device with broad RZ and little charge leakage at high driving voltage. Triplet mixed host devices with an exciton blocking layer showed a quantum efficiency over 90% of maximum quantum efficiency at a luminance of 20 000 cd m2.

AB - Origin of efficiency roll-off in phosphorescent organic light-emitting diodes was investigated with triplet mixed host devices and stable devices with little efficiency roll-off was developed. Efficiency roll-off was significant in the device with narrow recombination zone (RZ) and charge leakage out of emitting layer at high luminance was critical to efficiency roll-off. Efficiency roll-off could be reduced in triplet mixed host device with broad RZ and little charge leakage at high driving voltage. Triplet mixed host devices with an exciton blocking layer showed a quantum efficiency over 90% of maximum quantum efficiency at a luminance of 20 000 cd m2.

UR - https://www.scopus.com/pages/publications/38349092982

U2 - 10.1063/1.2836270

DO - 10.1063/1.2836270

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JO - Applied Physics Letters

JF - Applied Physics Letters

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ER -

Stable efficiency roll-off in phosphorescent organic light-emitting diodes

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