The origin of electron injection improvement in organic light-emitting devices with an organic oxide/rubrene electron injection layer

Kwanghee Cho, Sang Wan Cho, Chung Nam Whang, Kwangho Jeong, Seong Jun Kang, Yeonjin Yi

Research output: Contribution to journalArticle

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The electronic structure of tris(8-hydroquinoline) aluminum (Al q3) /rubrene/poly(ethylene glycol) dimethyl ether (PEGDE)/Al interfaces was studied using in situ ultraviolet photoelectron spectroscopy (UPS) and x-ray photoelectron spectroscopy (XPS). The UPS and XPS spectra allowed us to evaluate the complete energy level diagrams and to analyze the chemical interactions at the interfaces. When a PEGDE/rubrene double layer was inserted between Al and Al q3, the electron injection barrier height was greatly reduced compared to the interface without PEGDE/rubrene or with a single insertion layer of either PEGDE or rubrene.

Original languageEnglish
Article number152107
JournalApplied Physics Letters
Issue number15
Publication statusPublished - 2007 Oct 18


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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