Electron injection enhancement by diamond-like carbon film in organic electroluminescence devices

Dong Won Han; Soon Moon Jeong; Hong Koo Baik; Se Jong Lee; Nam Choul Yang; Dong Hack Suh

doi:10.1016/S0040-6090(02)00751-4

Electron injection enhancement by diamond-like carbon film in organic electroluminescence devices

Dong Won Han, Soon Moon Jeong, Hong Koo Baik, Se Jong Lee, Nam Choul Yang, Dong Hack Suh

Division of Energy Techonology

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

17 Scopus citations

Abstract

Diamond-like carbon (DLC) is deposited as an electron injection layer between the organic layer and Al cathode electrode in organic electroluminescence devices (OLEDs) by the use of Cs⁺ ion gun sputter deposition system. The devices consist of; indium tin oxide/PEDOT:PSS/MEH-PPV/DLC/aluminum. Electron injection properties have been investigated by I-V characteristics at various deposition conditions and the mechanism of electron injection enhancement due to a thin DLC layer has been studied. The characteristics of DLC film deposited at various negative carbon ion energies are examined by Raman spectroscopy. Optical microscope is also used to observe the Al surface after the light emission test. It is found that the sp²/sp³ ratio and electron affinity of DLC film are varied as the carbon ion energy increases from 50 to 200 eV, which enhance the electron injection and improve the property of OLEDs. An order magnitude increase in current is obtained from DLC layer inserted devices and the device stability is also improved.

Original language	English
Pages (from-to)	190-194
Number of pages	5
Journal	Thin Solid Films
Volume	420-421
DOIs	https://doi.org/10.1016/S0040-6090(02)00751-4
State	Published - 2 Dec 2002

Bibliographical note

Funding Information:
This work was supported by Korea Research Foundation Grant (KRF-2001-2-0834).

Keywords

Diamond-like carbon
MEH-PPV
Negative ion beam disposition
Organic electroluminescence devices (OLED)

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10.1016/S0040-6090(02)00751-4

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@article{65872de7b5ab4861a019adb2bd532cab,

title = "Electron injection enhancement by diamond-like carbon film in organic electroluminescence devices",

abstract = "Diamond-like carbon (DLC) is deposited as an electron injection layer between the organic layer and Al cathode electrode in organic electroluminescence devices (OLEDs) by the use of Cs+ ion gun sputter deposition system. The devices consist of; indium tin oxide/PEDOT:PSS/MEH-PPV/DLC/aluminum. Electron injection properties have been investigated by I-V characteristics at various deposition conditions and the mechanism of electron injection enhancement due to a thin DLC layer has been studied. The characteristics of DLC film deposited at various negative carbon ion energies are examined by Raman spectroscopy. Optical microscope is also used to observe the Al surface after the light emission test. It is found that the sp2/sp3 ratio and electron affinity of DLC film are varied as the carbon ion energy increases from 50 to 200 eV, which enhance the electron injection and improve the property of OLEDs. An order magnitude increase in current is obtained from DLC layer inserted devices and the device stability is also improved.",

keywords = "Diamond-like carbon, MEH-PPV, Negative ion beam disposition, Organic electroluminescence devices (OLED)",

author = "Han, {Dong Won} and Jeong, {Soon Moon} and Baik, {Hong Koo} and Lee, {Se Jong} and Yang, {Nam Choul} and Suh, {Dong Hack}",

note = "Funding Information: This work was supported by Korea Research Foundation Grant (KRF-2001-2-0834).",

year = "2002",

month = dec,

day = "2",

doi = "10.1016/S0040-6090(02)00751-4",

language = "English",

volume = "420-421",

pages = "190--194",

journal = "Thin Solid Films",

issn = "0040-6090",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Electron injection enhancement by diamond-like carbon film in organic electroluminescence devices

AU - Han, Dong Won

AU - Jeong, Soon Moon

AU - Baik, Hong Koo

AU - Lee, Se Jong

AU - Yang, Nam Choul

AU - Suh, Dong Hack

N1 - Funding Information: This work was supported by Korea Research Foundation Grant (KRF-2001-2-0834).

PY - 2002/12/2

Y1 - 2002/12/2

N2 - Diamond-like carbon (DLC) is deposited as an electron injection layer between the organic layer and Al cathode electrode in organic electroluminescence devices (OLEDs) by the use of Cs+ ion gun sputter deposition system. The devices consist of; indium tin oxide/PEDOT:PSS/MEH-PPV/DLC/aluminum. Electron injection properties have been investigated by I-V characteristics at various deposition conditions and the mechanism of electron injection enhancement due to a thin DLC layer has been studied. The characteristics of DLC film deposited at various negative carbon ion energies are examined by Raman spectroscopy. Optical microscope is also used to observe the Al surface after the light emission test. It is found that the sp2/sp3 ratio and electron affinity of DLC film are varied as the carbon ion energy increases from 50 to 200 eV, which enhance the electron injection and improve the property of OLEDs. An order magnitude increase in current is obtained from DLC layer inserted devices and the device stability is also improved.

AB - Diamond-like carbon (DLC) is deposited as an electron injection layer between the organic layer and Al cathode electrode in organic electroluminescence devices (OLEDs) by the use of Cs+ ion gun sputter deposition system. The devices consist of; indium tin oxide/PEDOT:PSS/MEH-PPV/DLC/aluminum. Electron injection properties have been investigated by I-V characteristics at various deposition conditions and the mechanism of electron injection enhancement due to a thin DLC layer has been studied. The characteristics of DLC film deposited at various negative carbon ion energies are examined by Raman spectroscopy. Optical microscope is also used to observe the Al surface after the light emission test. It is found that the sp2/sp3 ratio and electron affinity of DLC film are varied as the carbon ion energy increases from 50 to 200 eV, which enhance the electron injection and improve the property of OLEDs. An order magnitude increase in current is obtained from DLC layer inserted devices and the device stability is also improved.

KW - Diamond-like carbon

KW - MEH-PPV

KW - Negative ion beam disposition

KW - Organic electroluminescence devices (OLED)

UR - http://www.scopus.com/inward/record.url?scp=20244365288&partnerID=8YFLogxK

U2 - 10.1016/S0040-6090(02)00751-4

DO - 10.1016/S0040-6090(02)00751-4

M3 - Article

AN - SCOPUS:20244365288

SN - 0040-6090

VL - 420-421

SP - 190

EP - 194

JO - Thin Solid Films

JF - Thin Solid Films

ER -

Electron injection enhancement by diamond-like carbon film in organic electroluminescence devices

Abstract

Bibliographical note

Keywords

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