Effects of aluminum cathodes prepared by ion-beam-assisted deposition in organic light-emitting devices

Jeong, Soon Moon; Koo, Won Hoi; Choi, Sang Hun; Jo, Sung Jin; Baik, Hong Koo; Lee, Se-Jong; Song, Kie Moon
August 2004
Applied Physics Letters;8/9/2004, Vol. 85 Issue 6, p1051
Academic Journal
We have fabricated highly stable organic electroluminescent devices based on spin-coated soluble phenyl-substituted poly-p-phenylene-vinylene (Ph-PPVs) thin films. The electrical properties of aluminum cathode, prepared by ion-beam-assisted deposition, on Ph-PPV have been investigated and compared to those prepared by thermal evaporation. Although energetic particles of Al assisted by Ar+ ion may damage the organic material, I–V–L characteristics are improved by evaporating a thin Al buffer layer prior to ion-beam-assisted deposition. In addition, a dense Al cathode inhibits the permeation of H2O and O2 into Ph-PPV film by suppressing pinhole defects, and thus retards dark spot growth. This may be deduced from highly packed structure of Al cathode with smaller contact resistance between Al and Ph-PPV. The lifetime of an organic light-emitting device has been extended by dense Al film through an ion-beam-assisted deposition process.


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