Interfacial electronic structure of N, N′ -bis(1-naphthyl)- N, N′ -diphenyl-1, 1′ -biphenyl-4, 4′ -diamine/copper phthalocyanine: C60 composite/Au studied by ultraviolet photoemission spectroscopy

Sang Wan Cho; Kyung Hwa Yoo; Kwangho Jeong; Chung Nam Whang; Yeonjin Yi; Myungkeun Noh

doi:10.1063/1.2761211

Interfacial electronic structure of N, N′ -bis(1-naphthyl)- N, N′ -diphenyl-1, 1′ -biphenyl-4, 4′ -diamine/copper phthalocyanine: C₆₀ composite/Au studied by ultraviolet photoemission spectroscopy

Sang Wan Cho, Kyung Hwa Yoo, Kwangho Jeong, Chung Nam Whang, Yeonjin Yi, Myungkeun Noh

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

The interfacial electronic structures of N, N′ -bis(1-naphthyl)- N, N′ -diphenyl-1, 1′ -biphenyl-4, 4′ -diamine (NPB)/copper phthalocyanine (CuPc) Au, NPB C60 Au, and NPBCuPc: C60 composite/Au were investigated by in situ ultraviolet photoelectron spectroscopy to understand the highly efficient hole injection in organic light-emitting diode. The hole-injection barrier of CuPc: C60 Au was 0.52 eV, while those of CuPcAu and C60 Au were 0.96 and 1.62 eV, respectively. The lowered injection barrier is attributed to the smaller interface dipole of CuPc: C60 compared to that of pristine CuPc. This small interface dipole pulled up the highest occupied molecular orbital of CuPc in composite, which results in the decreased hole-injection barrier.

Original language	English
Article number	052102
Journal	Applied Physics Letters
Volume	91
Issue number	5
DOIs	https://doi.org/10.1063/1.2761211
Publication status	Published - 2007

Bibliographical note

Funding Information:
This work was supported by the BK21 project of the Korea Research Foundation (KRF) and the KOSEF through National Core Research Center for Nanomedical Technology.

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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@article{45699f1864e7483780679cce0fb8fbcd,

title = "Interfacial electronic structure of N, N′ -bis(1-naphthyl)- N, N′ -diphenyl-1, 1′ -biphenyl-4, 4′ -diamine/copper phthalocyanine: C60 composite/Au studied by ultraviolet photoemission spectroscopy",

abstract = "The interfacial electronic structures of N, N′ -bis(1-naphthyl)- N, N′ -diphenyl-1, 1′ -biphenyl-4, 4′ -diamine (NPB)/copper phthalocyanine (CuPc) Au, NPB C60 Au, and NPBCuPc: C60 composite/Au were investigated by in situ ultraviolet photoelectron spectroscopy to understand the highly efficient hole injection in organic light-emitting diode. The hole-injection barrier of CuPc: C60 Au was 0.52 eV, while those of CuPcAu and C60 Au were 0.96 and 1.62 eV, respectively. The lowered injection barrier is attributed to the smaller interface dipole of CuPc: C60 compared to that of pristine CuPc. This small interface dipole pulled up the highest occupied molecular orbital of CuPc in composite, which results in the decreased hole-injection barrier.",

author = "Cho, {Sang Wan} and Yoo, {Kyung Hwa} and Kwangho Jeong and Whang, {Chung Nam} and Yeonjin Yi and Myungkeun Noh",

note = "Funding Information: This work was supported by the BK21 project of the Korea Research Foundation (KRF) and the KOSEF through National Core Research Center for Nanomedical Technology. ",

year = "2007",

doi = "10.1063/1.2761211",

language = "English",

volume = "91",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "5",

}

Interfacial electronic structure of N, N′ -bis(1-naphthyl)- N, N′ -diphenyl-1, 1′ -biphenyl-4, 4′ -diamine/copper phthalocyanine: C₆₀ composite/Au studied by ultraviolet photoemission spectroscopy. / Cho, Sang Wan ; Yoo, Kyung Hwa ; Jeong, Kwangho et al.
In: Applied Physics Letters, Vol. 91, No. 5, 052102, 2007.

Research output: Contribution to journal › Article › peer-review

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T1 - Interfacial electronic structure of N, N′ -bis(1-naphthyl)- N, N′ -diphenyl-1, 1′ -biphenyl-4, 4′ -diamine/copper phthalocyanine

T2 - C60 composite/Au studied by ultraviolet photoemission spectroscopy

AU - Cho, Sang Wan

AU - Yoo, Kyung Hwa

AU - Jeong, Kwangho

AU - Whang, Chung Nam

AU - Yi, Yeonjin

AU - Noh, Myungkeun

N1 - Funding Information: This work was supported by the BK21 project of the Korea Research Foundation (KRF) and the KOSEF through National Core Research Center for Nanomedical Technology.

PY - 2007

Y1 - 2007

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