Origin of the improved luminance-voltage characteristics and stability in organic light-emitting device using CsCl electron injection layer

被引：34

作者：

Yi, YJ

Kang, SJ

Cho, K

Koo, JM

Han, K

Park, K

Noh, M

Whang, CN

Jeong, K

机构：

[1] Yonsei Univ, Inst Phys & Appl Phys, Seoul 120749, South Korea

[2] Yonsei Univ, Atom Scale Surface Sci Res Ctr, Seoul 120749, South Korea

来源：

APPLIED PHYSICS LETTERS | 2005年 / 86卷 / 21期

基金：

新加坡国家研究基金会;

关键词：

D O I：

10.1063/1.1935773

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The luminance-voltage characteristics and stability were highly improved by replacing LiF with CsCl in organic light-emitting devices. To investigate the origin of these improvements, ultraviolet photoelectron spectroscopy and x-ray photoelectron spectroscopy were used. The additional shifts of the vacuum, highest occupied molecular orbital, and lowest unoccupied molecular orbital levels due to the CsCl layer reduce the width and height of the electron injection barrier, resulting in the improved luminance-voltage characteristics of the devices. Additionally, the intervening CsCl layer between Al and Alq(3) prevents N-Al reactions among Alq(3) molecules and Al, which reduces distortion or breakdown of Alq(3) molecules and slows the degradation of the device. (c) 2005 American Institute of Physics.

引用

收藏

页码：1 / 3

页数：3

相关论文

共 13 条

[1] Enhanced hole injection in organic electroluminescent device with an additional oxygen-rich indium-tin-oxide sublayer [J].

Choi, MW ;

Cho, K ;

Sung, C ;

Yang, J ;

Noh, YYM ;

Choi, JC ;

Jeong, K .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 2004, 22 (02) :758-761

[2] Investigation of the interface formation between calcium and tris-(8-hydroxy quinoline) aluminum [J].

Choong, VE ;

Mason, MG ;

Tang, CW ;

Gao, YG .

APPLIED PHYSICS LETTERS, 1998, 72 (21) :2689-2691

[3] Atom-resolved electronic spectra for Alq3 from theory and experiment [J].

Curioni, A ;

Andreoni, W ;

Treusch, R ;

Himpsel, FJ ;

Haskal, E ;

Seidler, P ;

Heske, C ;

Kakar, S ;

van Buuren, T ;

Terminello, LJ .

APPLIED PHYSICS LETTERS, 1998, 72 (13) :1575-1577

[4] Distinguishing between interface dipoles and band bending at metal/tris-(8-hydroxyquinoline) aluminum interfaces [J].

Hill, IG ;

Mäkinen, AJ ;

Kafafi, ZH .

APPLIED PHYSICS LETTERS, 2000, 77 (12) :1825-1827

[5] An efficient organic light-emitting diode with silver electrodes [J].

Li, YQ ;

Tang, JX ;

Xie, ZY ;

Hung, LS ;

Lau, SS .

CHEMICAL PHYSICS LETTERS, 2004, 386 (1-3) :128-131

[6] Interfacial chemistry of Alq3 and LiF with reactive metals [J].

Mason, MG ;

Tang, CW ;

Hung, LS ;

Raychaudhuri, P ;

Madathil, J ;

Giesen, DJ ;

Yan, L ;

Le, QT ;

Gao, Y ;

Lee, ST ;

Liao, LS ;

Cheng, LF ;

Salaneck, WR ;

dos Santos, DA ;

Brédas, JL .

JOURNAL OF APPLIED PHYSICS, 2001, 89 (05) :2756-2765

[7] Electronic structure of 8-hydroxyquinoline aluminum/LiF/Al interface for organic electroluminescent device studied by ultraviolet photoelectron spectroscopy [J].

Mori, T ;

Fujikawa, H ;

Tokito, S ;

Taga, Y .

APPLIED PHYSICS LETTERS, 1998, 73 (19) :2763-2765

[8] Four-dimensional variational data assimilation for mesoscale and storm-scale applications [J].

Park, SK ;

Zupanski, D .

METEOROLOGY AND ATMOSPHERIC PHYSICS, 2003, 82 (1-4) :173-208

[9] Determination of frontier orbital alignment and band bending at an organic semiconductor heterointerface by combined X-ray and ultraviolet photoemission measurements [J].

Schlaf, R ;

Parkinson, BA ;

Lee, PA ;

Nebesny, KW ;

Armstrong, NR .

APPLIED PHYSICS LETTERS, 1998, 73 (08) :1026-1028

[10] ELECTRONIC STATES OF VAPOR-DEPOSITED ELECTRON AND HOLE TRANSPORT AGENTS AND LUMINESCENT MATERIALS FOR LIGHT-EMITTING-DIODES [J].

SCHMIDT, A ;

ANDERSON, ML ;

ARMSTRONG, NR .

JOURNAL OF APPLIED PHYSICS, 1995, 78 (09) :5619-5625