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

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17 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 languageEnglish
Article number052102
JournalApplied Physics Letters
Volume91
Issue number5
DOIs
Publication statusPublished - 2007 Aug 10

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diamines
photoelectric emission
injection
electronic structure
copper
composite materials
spectroscopy
dipoles
ultraviolet spectroscopy
molecular orbitals
light emitting diodes
photoelectron spectroscopy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

@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",
year = "2007",
month = "8",
day = "10",
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",

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TY - JOUR

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

PY - 2007/8/10

Y1 - 2007/8/10

N2 - 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.

AB - 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.

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