Red-emitting dendritic Iridium(III) complexes for solution processable phosphorescent organic light-emitting diodes

Functionalization of a red phosphorescent iridium(III) complex core surrounded by rigid polyphenylene dendrons with a hole-transporting triphenylamine surface allows to prevent the intermolecular aggregation-induced emission quenching, improves charge recombination, and therefore enhances photo- and electroluminescence efficiencies of dendrimer in solid state. These multifunctional shape-persistent dendrimers provide a new pathway to design highly efficient solution processable materials for phosphorescent organic light-emitting diodes (PhOLEDs). Red iridium triplet emitters are shielded by polyphenylene dendrons to prevent self quenching, and not needing a diluting matrix. They are decorated on the outside with triphenylamines for improving hole transport and charge recombination.