A class of organic metal complexes with mixed ligands for organic light emitting diodes are designed and characterized as the formula:(L.sup.2L.sup.3M)n. In this formula: L.sup.2 is a bidentate ligand which has at least one coordinate atom of oxygen; L.sup.3 is a tridentate ligand with three chelate points; M is trivalent metal selected from the group consisting of Al, Ga, In, Tl, and Ir; and n is an integer of from 1 to 2. In Formula (3), X, Y independently represent CH or N and II, III are unsubstituted or substituted aryl or heteroalkyl groups. The substituent groups can be alkyl having 1 8 carbon atoms, halogen, cyano, amino, amido, sulfonyl, carbonyl, aryl, or heteroalkyl groups such as furan, thiophene, pyrrole, pyridine, etc. These complexes can be used as emitting materials or electron transporting materials in organic EL devices ##STR00001##