Improved stability of organic light-emitting diode with aluminum cathodes prepared by ion beam assisted deposition

Soon Moon Jeong, Deuk Yeon Lee, Won Hoe Koo, Sang Hun Choi, Hong Koo Baik, Se Jong Lee, Kie Moon Song

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We have fabricated highly stable organic electroluminescent devices based on spin-coated poly-p-phenylene-vynylene (PPV) thin films. The electrical properties of aluminum cathode, prepared by ion beam assisted deposition, on PPV have been investigated and compared to those by thermal evaporation. Although energetic particles of Al assisted by Ar+ ion may damage the organic material, I-V-L characteristics are improved by applying thin Al buffer layer. In addition, a dense Al cathode inhibits the permeation of H2O and O2 into PPV film through pinhole defects, and thus retards dark spot growth. It may be deduced from highly packed structure of Al cathode with an increase in the contact area between Al and PPV that reduce the contact resistance. In conclusion, the lifetime of organic light-emitting device (OLED) has been extended effectively by dense Al film through ion beam assisted deposition process.

Original languageEnglish
Pages (from-to)97-102
Number of pages6
JournalScience and Technology of Advanced Materials
Issue number1
Publication statusPublished - 2005 Jan 1


All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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