Marked improvement in electroluminescence characteristics of organic light-emitting diodes using an ultrathin hole-injection layer of molybdenum oxide

Toshinori Matsusima, Guang He Jin, Hideyuki Murata

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

We show that the performance of organic light-emitting diodes (OLEDs) is markedly improved by optimizing the thickness of a hole-injection layer (HIL) of molybdenum oxide (MoO3) inserted between indium tin oxide and N, N′ -diphenyl- N, N′ -bis(1-naphthyl)- 1, 1′ -biphenyl- 4, 4′ -diamine (α-NPD). From results of the electroluminescence (EL) characteristics of OLEDs with various thicknesses of a MoO3 HIL, we found that the OLED with a 0.75-nm-thick MoO3 HIL had the lowest driving voltage and the highest power conversion efficiency among the OLEDs. Moreover, the operational lifetime of the OLED was improved by about a factor of 6 by using the 0.75-nm-thick MoO3 HIL. These enhanced EL characteristics are attributable to the formation of an Ohmic contact at the interfaces composed of ITO/ MoO3 /α-NPD.

Original languageEnglish
Article number054501
JournalJournal of Applied Physics
Volume104
Issue number5
DOIs
Publication statusPublished - Sep 22 2008
Externally publishedYes

Fingerprint

molybdenum oxides
electroluminescence
light emitting diodes
injection
diamines
ITO (semiconductors)
indium oxides
low voltage
tin oxides
electric contacts
life (durability)

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Marked improvement in electroluminescence characteristics of organic light-emitting diodes using an ultrathin hole-injection layer of molybdenum oxide. / Matsusima, Toshinori; Jin, Guang He; Murata, Hideyuki.

In: Journal of Applied Physics, Vol. 104, No. 5, 054501, 22.09.2008.

Research output: Contribution to journalArticle

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