High-triplet-energy host materials derived from directly-coupled carbazole-pyridoindole moieties

•Directly linked carbazole-pyridoindole core structure for host material•High triplet energy host materials with thermal stability•Benzonitrile and phenyl modification to manage charge transport properties

Directly-coupled carbazole-pyridoindole moieties containing host materials for green and blue phosphorescent organic light-emitting diodes were synthesized by linking the two moieties via two different positions on the carbazole-pyridoindole core structure. The carbazole-pyridoindole moieties were functionalized using benzonitrile and phenyl substituent groups to introduce controlled-charge transport properties. The host materials synthesized using the carbazole-pyridoindole moieties showed a maximum quantum efficiency of 19.1% in green phosphorescent devices, and 18.2% in blue phosphorescent devices.

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