Pyridine-Containing Bipolar Host Materials for Highly Efficient Blue Phosphorescent OLEDs

Abstract

A record high efficiency and reduced efficiency roll-off were achieved for blue phosphorescent OLEDs with novel bipolar host materials containing both carbazole electron donor and pyridine electron acceptor because of good confinement of triplet excitons on the guest molecules and improved carrier balance injected into the emissive layer.