Phosphorescent organic light-emitting devices (PhOLEDs) based on heteroleptic bis-cyclometalated complexes using acetylacetonate as the ancillary ligand

A series of four heteroleptic iridium (III) complexes comprising acetylacetonate as the ancillary ligand is synthesized and tested as phosphorescent dopants in OLEDs. It was found that the substitution pattern of the cyclometalated ligand strongly influences the device performance. Notably, reduced device performances were observed for the fluorinated complexes as a result of poor exciton confinement in the guest molecules.