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Current Density Dependence of Transient Electroluminescence in Phosphorescent Organic Light-Emitting Diodes

Published online by Cambridge University Press:  14 January 2011

Hirotake Kajii ,
Noriyoshi Takahota ,
Yadong Wang  and
Yutaka Ohmori
Hirotake Kajii
Affiliation:
Center for Advanced Science and Innovation, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
Noriyoshi Takahota
Affiliation:
Center for Advanced Science and Innovation, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
Yadong Wang
Affiliation:
Center for Advanced Science and Innovation, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
Yutaka Ohmori
Affiliation:
Center for Advanced Science and Innovation, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
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Abstract

The transient electroluminescence (EL) of phosphorescent organic light-emitting diodes (OLEDs) was investigated. The behaviors of the transient characteristics are analyzed using the triplet-triplet annihilation model. The device exhibited a gradual decrease in quantum current efficiency owing to the triplet-triplet annihilation at a high current density. At a higher current density, the reduced rise and decay times are due to high-density triplet excitons related to the enhanced triplet-triplet annihilation and the increase of the nonradiative process. The modulation speed of the devices is mainly limited by the phosphorescent recombination lifetime.

Keywords

organicdeviceselectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1286: Symposium E – Molecular and Hybrid Materials for Electronics and Photonics , 2011 , mrsf10-1286-e03-12
Copyright
Copyright © Materials Research Society 2011

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References

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