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 Matsusima, Hideyuki Murata

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21 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number034507
JournalJournal of Applied Physics
Volume104
Issue number3
DOIs
Publication statusPublished - Aug 25 2008

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carrier injection
heterojunctions
anodes
light emitting diodes
life (durability)
molybdenum oxides
retarding
injection
degradation
heat
electric potential
molecules

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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