Highly efficient and substrate independent CsF/Yb/Ag cathodes for organic light-emitting devices

被引：23

作者：

Chan, MY ^{[1
]}

Lai, SL ^{[1
]}

Fung, MK ^{[1
]}

Lee, CS ^{[1
]}

Lee, ST ^{[1
]}

机构：

[1] City Univ Hong Kong, COSDAF, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China

来源：

CHEMICAL PHYSICS LETTERS | 2003年 / 374卷 / 3-4期

关键词：

D O I：

10.1016/S0009-2614(03)00675-4

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The application of a cathode system comprising of an ultrathin CsF layer and an overlaid ytterbium (Yb) metal in organic electroluminescent devices is reported. This cathode shows dramatically reduced operating voltage and improved current and power efficiencies, both in small molecule or polymer based devices. The improvement is attributed to the dissociation of CsF upon Yb deposition to liberate low-work function Cs which reduces the electron injection barrier at the cathode/organic interface. Thermodynamically, the CsF dissociation is a substrate-independent process, and should be applicable for most organic based devices. Devices with this bilayer cathode system also show good operational stability. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：215 / 221

页数：7

共 25 条

[1] LiF/Al cathodes and the effect of LiF thickness on the device characteristics and built-in potential of polymer light-emitting diodes [J].

Brown, TM ;

Friend, RH ;

Millard, IS ;

Lacey, DJ ;

Burroughes, JH ;

Cacialli, F .

APPLIED PHYSICS LETTERS, 2000, 77 (19) :3096-3098

[2] Efficient electron injection in blue-emitting polymer light-emitting diodes with LiF/Ca/Al cathodes [J].

Brown, TM ;

Friend, RH ;

Millard, IS ;

Lacey, DJ ;

Burroughes, JH ;

Cacialli, F .

APPLIED PHYSICS LETTERS, 2001, 79 (02) :174-176

[3] Efficient CsF/Yb/Ag cathodes for organic light-emitting devices [J].

Chan, MY ;

Lai, SL ;

Fung, MK ;

Tong, SW ;

Lee, CS ;

Lee, ST .

APPLIED PHYSICS LETTERS, 2003, 82 (11) :1784-1786

[4] 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

[5] Improvement in electron and hole injection at electrodes and in recombination at a two-organic-layer interface [J].

Fujihira, M ;

Ganzorig, C .

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 2001, 85 (2-3) :203-208

[6] Organic electroluminescent devices using alkaline-earth fluorides as an electron injection layer [J].

Fujikawa, H ;

Mori, T ;

Noda, K ;

Ishii, M ;

Tokito, S ;

Taga, Y .

JOURNAL OF LUMINESCENCE, 2000, 87-9 :1177-1179

[7] 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

[8] An experimental study of poly(9,9-dioctyl-fluorene) and its interfaces with Li, Al, and LiF [J].

Greczynski, G ;

Fahlman, M ;

Salaneck, WR .

JOURNAL OF CHEMICAL PHYSICS, 2000, 113 (06) :2407-2412

[9] Hybrid interfaces of poly(9,9-dioctylfluorene) employing thin insulating layers of CsF: A photoelectron spectroscopy study [J].

Greczynski, G ;

Fahlman, M ;

Salaneck, WR .

JOURNAL OF CHEMICAL PHYSICS, 2001, 114 (19) :8628-8636

[10] Chemical structure of Al/LiF/Alq interfaces in organic light-emitting diodes [J].

Grozea, D ;

Turak, A ;

Feng, XD ;

Lu, ZH ;

Johnson, D ;

Wood, R .

APPLIED PHYSICS LETTERS, 2002, 81 (17) :3173-3175

← 1 2 3 →