Enhancing power conversion efficiencies and operational stability of organic light-emitting diodes by increasing carrier injection efficiencies at anode/organic and organic/organic heterojunction interfaces

Toshinori Matsushima, Hideyuki Murata

研究成果: ジャーナルへの寄稿学術誌査読

23 被引用数 (Scopus)

抄録

We fabricated long-lived multilayer organic light-emitting diodes (OLEDs), in which a 0.75 nm thick hole-injection layer of molybdenum oxide (MoO3) and a 5 nm thick mixed layer at an organic/organic heterojunction interface were embedded. The use of the MoO3 layer and of the mixed layer enhanced carrier injection at anode/organic and organic/organic heterojunction interfaces, resulting in a marked decrease in driving voltage and an increase in power conversion efficiency in the OLEDs. We observed about a factor of 9 improvement in the operational lifetime of the OLEDs by using the MoO3 layer and the mixed layer as well. We assume that the lifetime improvement originates from the suppression of a thermally induced electrochemical degradation process of organic emitting molecules due to the reduction in the probability of the generation of Joule heat.

本文言語英語
論文番号034507
ジャーナルJournal of Applied Physics
104
3
DOI
出版ステータス出版済み - 2008
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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