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

doi:10.1063/1.2798588

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 journal › Article › peer-review

3 Citations (Scopus)

Abstract

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 language	English
Article number	152107
Journal	Applied Physics Letters
Volume	91
Issue number	15
DOIs	https://doi.org/10.1063/1.2798588
Publication status	Published - 2007

Bibliographical note

Funding Information:
This work was supported by Institute of Physics and Applied Physics (IPAP) at Yonsei University, BK21 project of the Korea Research Foundation (KRF), and the KRF Grant funded by Korean Government (MOEHRD) (KRF-2005-015-C00130). Y. Yi thanks James E. Lyon for valuable discussions.

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2798588

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

abstract = "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.",

author = "Kwanghee Cho and Cho, {Sang Wan} and Whang, {Chung Nam} and Kwangho Jeong and Kang, {Seong Jun} and Yeonjin Yi",

note = "Funding Information: This work was supported by Institute of Physics and Applied Physics (IPAP) at Yonsei University, BK21 project of the Korea Research Foundation (KRF), and the KRF Grant funded by Korean Government (MOEHRD) (KRF-2005-015-C00130). Y. Yi thanks James E. Lyon for valuable discussions. ",

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AU - Cho, Kwanghee

AU - Cho, Sang Wan

AU - Whang, Chung Nam

AU - Jeong, Kwangho

AU - Kang, Seong Jun

AU - Yi, Yeonjin

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