Answers are grounded in this paper and cite their sources.
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.
No takes yet. Share an insight, caveat, or question.
Su et al. (2008) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: