Indium Tin Oxide Modified by Au and Vanadium Pentoxide as an Efficient Anode for Organic Light-Emitting Devices

Author

Zhang, H.M. ; Choy, Wallace C.H.

Author_Institution

Changchun Inst. of Appl. Chem., Chinese Acad. of Sci., Changchun

Volume

55

Issue

9

fYear

2008

Firstpage

2517

Lastpage

2520

Abstract

Au/Vanadium pentoxide (V₂O₅) films on indium tin oxide (ITO) as composite anodes for hole injection in organic light-emitting devices (OLEDs) have been investigated. The device with ITO/Au(6 nm)/V₂O₅ (6 nm) anode shows improved current density-voltage characteristics as compared with the device with ITO/Au as anode. Hole injection is significantly reduced when Au was added on ITO as an anode. However, while a thin V₂O₅ film is deposited on a Au anode, the barrier height is substantially reduced. The hole injection is facilitated, and the driving voltage of the device decreased by 10 V. In addition, the maximum current efficiency for the ITO/Au/V₂O₅ OLED is ~3.5 cd/A, which is higher than that of the ITO/Au anode device (~1.1 cd/A) and ITO/V₂O₅ OLED of ~2.8 cd/A.

Keywords

anodes; current density; light emitting devices; thin films; Au; ITO; V₂O₅; anode; barrier height; current density-voltage characteristics; driving voltage; hole injection; maximum current efficiency; organic light-emitting devices; thin film; Anodes; Chemistry; Conductivity; Electrodes; Gold; Indium tin oxide; Organic light emitting diodes; Surface contamination; Surface treatment; Voltage; Efficient anode; improved hole injection; organic light-emitting devices (OLEDs); reduced driving voltage;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2008.927387

Filename

4585392