Title :
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
fDate :
8/1/1997 12:00:00 AM
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;
Journal_Title :
Electron Devices, IEEE Transactions on
