Low driving voltage in organic light-emitting diodes using MoO3 as an interlayer in hole transport layer

Driving voltage of organic light-emitting diodes (OLEDs) was lowered by applying MoO3 as an interlayer between hole injection layer (HIL) and hole transport layer (HTL). MoO3 was effective as an interlayer between HIL and HTL due to its valence band of around 5.3 eV which is suitable for hole injection. Hole injection from HIL to HTL was enhanced by MoO3 interlayer and driving voltage of green fluorescent device could be lowered by 1.3 V at 1000 cd/m2 by using thin MoO3 interlayer.