| abstract |
A compound comprising a ligand L A of Formula I, n n n n n n n n n n where G has a structure of n n n n n n n n n n is disclosed. In ligand L A , Ring C is a 5-membered or 6-membered ring; K is a direct bond, O, or S; when K is O or S, X 6 is C; each of R A , R B , and R C is H or a substituent, and can be joined together to form a ring; each of X 1 to X 6 is independently C or N; X 1 is C if it is connected to ring C; the R B substituents of at least two adjacent ones of X 2 to X 5 are joined to form a ring; and the ligand L A is complexed to Ir through the two indicated dash lines to form a 5-membered chelate ring. Organic light emitting devices, consumer products, formulations, and chemical structures containing the compounds are also disclosed. |