Injection modifications by ITO functionalization with a self-assembled monolayer in OLEDs

被引：42
作者：
Besbes, S [1 ]
Ltaief, A
Reybier, K
Ponsonnet, L
Jaffrezic, N
Davenas, J
Ben Ouada, H
机构：
[1] Fac Sci, Lab Phys Interfaces, Monastir 5000, Tunisia
[2] Univ Lyon 1, Ingn Mat Polymeres, F-69622 Villeurbanne, France
[3] Ecole Cent Lyon, F-69131 Ecully, France
来源：
SYNTHETIC METALS | 2003年 / 138卷 / 1-2期
关键词：
POMX; self-assembled monolayer (SAM); surface free energy (SFE); I-V characteristics; space-charge limited conduction (SCLC);
D O I：
10.1016/S0379-6779(02)01270-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Operating conditions of OLEDs are very sensitive to the surface properties of indium tin oxide (ITO). Wettability measurements have been performed to characterize ITO surface properties and their modification upon deposition of a self-assembled monolayer. Contact angle measurements demonstrate that ITO surface is basic. Upon grafting with phosphonic acid, the surface becomes acid. The I(V) characteristics of light-emittincy diodes (LEDs) based on a soluble PPV derivative: poly(2-octoxy-5-methoxy-1,4-phenylenevinylene) (POMX) by such functionalized ITO show a reduction of the onset voltage and a rectification ratio enhancement. The electrical characteristics follow a spacecharge limited conduction (SCLC) behavior. Such modified ITO electrodes lead to main improvements of the diode properties through operating voltage reduction and stability increase.) (C) 2003 Elsevier Science B.V. All fights reserved.
引用
收藏
页码：197 / 200
页数：4
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