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Current Density Dependence of Transient Electroluminescence inPhosphorescent 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 organiclight-emitting diodes (OLEDs) was investigated. The behaviors of thetransient characteristics are analyzed using the triplet-tripletannihilation model. The device exhibited a gradual decrease in quantumcurrent efficiency owing to the triplet-triplet annihilation at a highcurrent density. At a higher current density, the reduced rise and decaytimes are due to high-density triplet excitons related to the enhancedtriplet-triplet annihilation and the increase of the nonradiative process.The modulation speed of the devices is mainly limited by the phosphorescentrecombination lifetime.

Keywords

organicdeviceselectrical properties

Information

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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