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

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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.

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Authors and Affiliations

  1. Center for Advanced Science and Innovation, Osaka University, Osaka, 2-1 Yamada-oka, 565-0871, Suita, Japan

    Hirotake Kajii, Noriyoshi Takahota, Yadong Wang & Yutaka Ohmori

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  1. Hirotake Kajii
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  2. Noriyoshi Takahota
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  3. Yadong Wang
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  4. Yutaka Ohmori
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Kajii, H., Takahota, N., Wang, Y. et al. Current Density Dependence of Transient Electroluminescence in Phosphorescent Organic Light-Emitting Diodes. MRS Online Proceedings Library 1286, 312 (2010). https://doi.org/10.1557/opl.2011.6

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  • DOI: https://doi.org/10.1557/opl.2011.6

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