The blue aluminum and gallium chelates for OLEDs

Pentacoordinate Al and Ga complexes of the type ML₂OR, where L is a 2-methyl-8-quinolinolate and OR is a monodentate, anionic O donor ligand, were optimized for robust use in vapor-deposited OLEDs. Photophysical, thermal, and crystallographic properties relevant to OLEDs are reported. The utility of the complexes is illustrated in new formulations for blue fluorescent and red phosphorescent OLEDs.