Ca/Ag bilayer cathode for transparent white organic light-emitting devices

C. J. Lee; R. B. Pode; J. I. Han; D. G. Moon

doi:10.1016/j.apsusc.2006.09.026

Ca/Ag bilayer cathode for transparent white organic light-emitting devices

C. J. Lee, R. B. Pode, J. I. Han, D. G. Moon

Department of Chemical and Biochemical Engineering

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

22 Scopus citations

Abstract

We have demonstrated that the compositional modification of the Ca/Ag films is principally responsible for a high transmittance (over 70% in the visible range) and low sheet resistance (10-12 Ω/sq). X-ray photoelectron spectroscopy (XPS) sputter depth profiling of Ca/Ag structure reveals the presence of Ca(OH) ₂ and Ca metal. A chemical model of the Ca/Ag cathode is proposed. Using transparent ITO anode and Ca (10 nm)/Ag (10 nm) cathode, efficient white organic light-emitting devices (WOLEDs) emitting from both sides have been fabricated. Brightness of 3813 cd/m ² and Commission Internationale de l'Eclairage (CIE) coordinates (0.36, 0.34) at 10 V through ITO anode and values of 1216 cd/m ² and (0.33, 0.30) through Ca/Ag cathode are reported. A low turn-on voltage of 5.5 V is measured.

Original language	English
Pages (from-to)	4249-4253
Number of pages	5
Journal	Applied Surface Science
Volume	253
Issue number	9
DOIs	https://doi.org/10.1016/j.apsusc.2006.09.026
State	Published - 28 Feb 2007

Keywords

Ca/Ag semitransparent cathode
Transmittance
Transparent WOLEDs
XPS

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10.1016/j.apsusc.2006.09.026

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@article{6790deda00284a5db32a6866aafc23ab,

title = "Ca/Ag bilayer cathode for transparent white organic light-emitting devices",

abstract = " We have demonstrated that the compositional modification of the Ca/Ag films is principally responsible for a high transmittance (over 70% in the visible range) and low sheet resistance (10-12 Ω/sq). X-ray photoelectron spectroscopy (XPS) sputter depth profiling of Ca/Ag structure reveals the presence of Ca(OH) 2 and Ca metal. A chemical model of the Ca/Ag cathode is proposed. Using transparent ITO anode and Ca (10 nm)/Ag (10 nm) cathode, efficient white organic light-emitting devices (WOLEDs) emitting from both sides have been fabricated. Brightness of 3813 cd/m 2 and Commission Internationale de l'Eclairage (CIE) coordinates (0.36, 0.34) at 10 V through ITO anode and values of 1216 cd/m 2 and (0.33, 0.30) through Ca/Ag cathode are reported. A low turn-on voltage of 5.5 V is measured.",

keywords = "Ca/Ag semitransparent cathode, Transmittance, Transparent WOLEDs, XPS",

author = "Lee, {C. J.} and Pode, {R. B.} and Han, {J. I.} and Moon, {D. G.}",

year = "2007",

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doi = "10.1016/j.apsusc.2006.09.026",

language = "English",

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journal = "Applied Surface Science",

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T1 - Ca/Ag bilayer cathode for transparent white organic light-emitting devices

AU - Lee, C. J.

AU - Pode, R. B.

AU - Han, J. I.

AU - Moon, D. G.

PY - 2007/2/28

Y1 - 2007/2/28

N2 - We have demonstrated that the compositional modification of the Ca/Ag films is principally responsible for a high transmittance (over 70% in the visible range) and low sheet resistance (10-12 Ω/sq). X-ray photoelectron spectroscopy (XPS) sputter depth profiling of Ca/Ag structure reveals the presence of Ca(OH) 2 and Ca metal. A chemical model of the Ca/Ag cathode is proposed. Using transparent ITO anode and Ca (10 nm)/Ag (10 nm) cathode, efficient white organic light-emitting devices (WOLEDs) emitting from both sides have been fabricated. Brightness of 3813 cd/m 2 and Commission Internationale de l'Eclairage (CIE) coordinates (0.36, 0.34) at 10 V through ITO anode and values of 1216 cd/m 2 and (0.33, 0.30) through Ca/Ag cathode are reported. A low turn-on voltage of 5.5 V is measured.

AB - We have demonstrated that the compositional modification of the Ca/Ag films is principally responsible for a high transmittance (over 70% in the visible range) and low sheet resistance (10-12 Ω/sq). X-ray photoelectron spectroscopy (XPS) sputter depth profiling of Ca/Ag structure reveals the presence of Ca(OH) 2 and Ca metal. A chemical model of the Ca/Ag cathode is proposed. Using transparent ITO anode and Ca (10 nm)/Ag (10 nm) cathode, efficient white organic light-emitting devices (WOLEDs) emitting from both sides have been fabricated. Brightness of 3813 cd/m 2 and Commission Internationale de l'Eclairage (CIE) coordinates (0.36, 0.34) at 10 V through ITO anode and values of 1216 cd/m 2 and (0.33, 0.30) through Ca/Ag cathode are reported. A low turn-on voltage of 5.5 V is measured.

KW - Ca/Ag semitransparent cathode

KW - Transmittance

KW - Transparent WOLEDs

KW - XPS

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DO - 10.1016/j.apsusc.2006.09.026

M3 - Article

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SN - 0169-4332

VL - 253

SP - 4249

EP - 4253

JO - Applied Surface Science

JF - Applied Surface Science

IS - 9

ER -

Ca/Ag bilayer cathode for transparent white organic light-emitting devices

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Keywords

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