A compound comprising a first ligand LA having a Formula selected from:




is disclosed. In the Formulas rings B and C are 5-membered or 6-membered aromatic or heteroaromatic ring; Z1, Z2, X1, X2, X3, X4, X5, and X6 are each C or N, but X1, X2, X3, or X4 is C when it forms a direct bond to Z2; Y is selected from CRR′, NR′, O, S, and Se; R, R′, RA, RB, RC, and RD are each selected from a variety of substituents; the ligand LA is coordinated to a metal M by the dashed lines, and optionally to other ligands. Organic light emitting devices and consumer products containing the compounds are also disclosed.