reported a halogen-free blue emitter, mer-tris(N-dibenzofuranyl-N′-methylimidazole)iridium(III) (Ir(dbfmi)) (Figure 33). By doping a 10 wt% Ir(dbfmi) into a 3,6-bis(diphenylphosphoryl)-9-phenylcarbazole (PO9) host, the resultant device showed a maximum EQE of 19% with CIExy (...