Effects of hole carrier injection and transport in organic light-emitting diodes

Author

Antoniadis, Homer ; Miller, Jeffry N. ; Roitman, Daniel B. ; Cambell, Ian H.

Author_Institution

Hewlett-Packard Co., Palo Alto, CA, USA

Volume

44

Issue

8

fYear

1997

fDate

8/1/1997 12:00:00 AM

Firstpage

1289

Lastpage

1294

Abstract

In this paper, we examine the effects of hole carrier injection and mobility on both the electroluminescence (EL) quantum efficiency and the operating voltage of bilayer organic light-emitting diodes (OLED´s). We find that hole-injection is limited by the nature of the hole injecting interface and significantly affects the operating voltage, but not the quantum efficiency of the OLED. Hole mobility is found not to affect the device quantum efficiency. We demonstrate the characteristics of an ideal ohmic contact by measuring space-charge-limited currents in a trap-free hole transporting polymer layer

Keywords

conducting polymers; electroluminescence; hole mobility; light emitting diodes; ohmic contacts; organic semiconductors; polymer films; space-charge-limited conduction; ITO; InSnO; bilayer organic LEDs; electroluminescence quantum efficiency; hole carrier injection; hole carrier transport; hole injecting interface; hole mobility; ideal ohmic contact; operating voltage; organic light-emitting diodes; space-charge-limited currents; trap-free hole transporting polymer layer; Anodes; Cathodes; Charge carrier processes; Electron emission; Indium tin oxide; Laboratories; Ohmic contacts; Organic light emitting diodes; Substrates; Voltage;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/16.605470

Filename

605470