TITLE

Enhancement of current injection in organic light emitting diodes with sputter treated molybdenum oxides as hole injection layers

AUTHOR(S)
Po-Sheng Wang; I-Wen Wu; Wei-Hsuan Tseng; Mei-Hsin Chen; Chih-I Wu
PUB. DATE
April 2011
SOURCE
Applied Physics Letters;4/25/2011, Vol. 98 Issue 17, p173302
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The enhancement of current density and luminance in organic light emitting diodes is achieved by treating molybdenum oxide (MoO3) hole-injection-layers with slight argon ion sputtering. The sputter treated MoO3 layers provide improvement in current injection efficiency, resulting in better current density which is about ten times higher than that of the reference devices. Photoemission spectroscopy shows that molybdenum in MoO3 is reduced to lower oxidation states after sputter treatment due to the removal of oxygen. As a result, gap states are formed to enhance metallic characteristics of the sputter treated MoO3 surface and facilitate better hole injection efficiency.
ACCESSION #
60283621

 

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