Dual role of LiF as a hole-injection buffer in organic light-emitting diodes

被引：69

作者：

Zhao, JM ^{[1
]}

Zhang, ST ^{[1
]}

Wang, XJ ^{[1
]}

Zhan, YQ ^{[1
]}

Wang, XZ ^{[1
]}

Zhong, GY ^{[1
]}

Wang, ZJ ^{[1
]}

Ding, XM ^{[1
]}

Huang, W ^{[1
]}

Hou, XY ^{[1
]}

机构：

[1] Fudan Univ, Inst Adv Mat, Natl Key Lab, Surface Phys Lab, Shanghai 200433, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2004年 / 84卷 / 15期

关键词：

D O I：

10.1063/1.1695444

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

It is demonstrated experimentally that the effect of a LiF buffer layer inserted at the ITO\N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1' biphenyl 4,4(')-dimaine (NPB) interface on the hole injection is greatly dependent on the initial barrier height (IBH) existing at the interface. Only for a large IBH, will the introduction of the LiF show improvement effect. For small one, it will weaken the hole injection. These phenomena are explained in terms of tunneling model and calculations based on this model show a good agreement with the experimental results. This further confirms that the energy level realignment and the change in carrier tunneling probability are mainly responsible for the variation of current injection induced by the insulating buffers in organic light-emitting diodes. (C) 2004 American Institute of Physics.

引用

页码：2913 / 2915

页数：3

共 17 条

[1] Enhanced brightness and efficiency in organic electroluminescent devices using SiO2 buffer layers [J].

Deng, ZB ;

Ding, XM ;

Lee, ST ;

Gambling, WA .

APPLIED PHYSICS LETTERS, 1999, 74 (15) :2227-2229

[2] Alkali metal acetates as effective electron injection layers for organic electroluminescent devices [J].

Ganzorig, C ;

Suga, K ;

Fujihira, M .

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 2001, 85 (2-3) :140-143

[3] 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

[4] Enhancing the electroluminescent properties of organic light-emitting devices using a thin NaCl layer [J].

Kang, SJ ;

Park, DS ;

Kim, SY ;

Whang, CN ;

Jeong, K ;

Im, S .

APPLIED PHYSICS LETTERS, 2002, 81 (14) :2581-2583

[5] Bright small molecular white organic light-emitting devices with two emission zones [J].

Kim, CH ;

Shinar, J .

APPLIED PHYSICS LETTERS, 2002, 80 (12) :2201-2203

[6] Enhanced quantum efficiency in polymer electroluminescence devices by inserting a tunneling barrier formed by Langmuir-Blodgett films [J].

Kim, YE ;

Park, H ;

Kim, JJ .

APPLIED PHYSICS LETTERS, 1996, 69 (05) :599-601

[7] Fabrication and electroluminescence of double-layered organic light-emitting diodes with the Al2O3/Al cathode [J].

Li, F ;

Tang, H ;

Anderegg, J ;

Shinar, J .

APPLIED PHYSICS LETTERS, 1997, 70 (10) :1233-1235

[8] 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

[9] Role of CsF on electron injection into a conjugated polymer [J].

Piromreun, P ;

Oh, H ;

Shen, YL ;

Malliaras, GG ;

Scott, JC ;

Brock, PJ .

APPLIED PHYSICS LETTERS, 2000, 77 (15) :2403-2405

[10]

SIMON JM, 2002, ORG ELECTRON, V3, P129

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