Surface morphology and interdiffusion of LiF in Alq3-based organic light-emitting devices

被引：8

作者：

Lee, Young Joo ^{[1
]}

Li, Xiaolong ^{[1
]}

Kang, Da-Yeon ^{[2
]}

Park, Seong-Sik ^{[3
]}

Kim, Jinwoo ^{[4
]}

Choi, Jeong-Woo ^{[2
,5
]}

Kim, Hyunjung ^{[1
,5
]}

机构：

[1] Sogang Univ, Dept Phys, Seoul 121742, South Korea

[2] Sogang Univ, Dept Chem & Biomol Engn, Seoul 121742, South Korea

[3] Samsung Corning Co Ltd, Suwon 443270, Gyeonggi Do, South Korea

[4] Gwangju Inst Sci & Technol, Dept Mat Sci & Engn, Kwangju 500712, South Korea

[5] Sogang Univ, Interdisciplinary Program Integrated Biotechnol, Seoul 121742, South Korea

来源：

ULTRAMICROSCOPY | 2008年 / 108卷 / 10期

关键词：

organic light-emitting device; X-ray reflectivity; atomic force microscopy; LiF; surface morphology; interdiffusion;

D O I：

10.1016/j.ultramic.2008.04.086

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

Highly efficient organic light-emitting devices (OLEDs) have been realized by insertion of a thin insulating lithium fluoride (LiF) layer between aluminum (M) cathode and an electron transport layer, tris-(8-hydroxyquinoline) aluminum (Alq(3)). In this paper, we study the surface morphology of LiF on Alq(3) by synchrotron X-ray scattering and atomic force microscopy (AFM) as a function of thickness of LiF. We also study the interdiffusion of LiF into Al cathode as well as into Alq(3) layer as a function of temperature. Initially, LiF molecules are distributed randomly as Clusters on the Alq(3) layer and then gradually form a layer as increasing LiF thickness. The interdiffusion of LiF into Al occurs more actively than into Alq(3) in annealing process. LiF on Alq(3) induces the ordering of Al to (111) direction strongly with increasing LiF thickness. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：1315 / 1318

页数：4

共 11 条

[1] Application of an ultrathin LiF/Al bilayer in organic surface-emitting diodes [J].

Hung, LS ;

Tang, CW ;

Mason, MG ;

Raychaudhuri, P ;

Madathil, J .

APPLIED PHYSICS LETTERS, 2001, 78 (04) :544-546

[2] Enhanced electron injection in organic electroluminescence devices using an Al/LiF electrode [J].

Hung, LS ;

Tang, CW ;

Mason, MG .

APPLIED PHYSICS LETTERS, 1997, 70 (02) :152-154

[3] Enhanced brightness and efficiency of organic light-emitting diodes with an LiF in the Alq3 [J].

Kim, Young Min ;

Lee, Joo Won ;

Jung, Jae Hoon ;

Paek, Kyeong-Kap ;

Sung, Man Young ;

Kim, Jai Kyeong ;

Ju, Byeong Kwon .

IEEE ELECTRON DEVICE LETTERS, 2006, 27 (07) :558-560

[4] 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

[5] SURFACE STUDIES OF SOLIDS BY TOTAL REFLECTION OF X-RAYS [J].

PARRATT, LG .

PHYSICAL REVIEW, 1954, 95 (02) :359-369

[6] Photoemission spectroscopy of LiF coated Al and Pt electrodes [J].

Schlaf, R ;

Parkinson, BA ;

Lee, PA ;

Nebesny, KW ;

Jabbour, G ;

Kippelen, B ;

Peyghambarian, N ;

Armstrong, NR .

JOURNAL OF APPLIED PHYSICS, 1998, 84 (12) :6729-6736

[7] ORGANIC ELECTROLUMINESCENT DIODES [J].

TANG, CW ;

VANSLYKE, SA .

APPLIED PHYSICS LETTERS, 1987, 51 (12) :913-915

[8]

TOLAN M, 1999, XRAY SCATTERING SOFT, P109

[9] Experimental study of a chemical reaction between LiF and Al [J].

Wang, SD ;

Fung, MK ;

Lai, SL ;

Tong, SW ;

Lee, CS ;

Lee, ST ;

Zhang, HJ ;

Bao, SN .

JOURNAL OF APPLIED PHYSICS, 2003, 94 (01) :169-173

[10] Enhancement of electron injection in organic light-emitting devices using an Ag/LiF cathode [J].

Wang, XJ ;

Zhao, JM ;

Zhou, YC ;

Wang, XZ ;

Zhang, ST ;

Zhan, YQ ;

Xu, Z ;

Ding, HJ ;

Zhong, GY ;

Shi, HZ ;

Xiong, ZH ;

Liu, Y ;

Wang, ZJ ;

Obbard, EG ;

Ding, XM ;

Huang, W ;

Hou, XY .

JOURNAL OF APPLIED PHYSICS, 2004, 95 (07) :3828-3830

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