Phosphorescent materials

An organic light emitting device, comprising:

• an anode:
• a cathode;
• and
• an organic layer, disposed between the anode and the cathode, the organic layer further comprising a compound having the formula:
• wherein B and C are each independently a 5 or 6-membered carbocyclic or heterocyclic ring;
• wherein A-B represents a bonded pair of carbocyclic or heterocyclic rings coordinated to the metal M via a nitrogen atom in ring A and an sp2 hybridized atom in ring B;
• wherein A-C represents a bonded pair of carbocyclic or heterocyclic rings;
• wherein Ra, Rb, and Rc may represent mono, di, tri, or tetra substitutions;
• wherein Ra, Rb, and Rc are independently selected from the group consisting of hydrogen, alkyl, alkoxy, amino, alkenyl, alkynyl, arylkyl, aryl, and heteroaryl;
• wherein X1, X2, X3, X4, X5, X6, X7, X8, and X9 are independently selected from carbon and nitrogen;
• wherein R1 and R2 are independently selected from the group consisting of hydrogen, alkyl, alkoxy, amino, alkenyl, alkynyl, arylkyl, aryl, and heteroaryl;
• and
• wherein at least one of R1, R2, and the Ra substituents adjacent to C is not hydrogen;
• and
• wherein the ligand L is coordinated to a metal having an atomic number greater than 40.

An organic light emitting device, comprising:

• an anode;
• a cathode;
• and
• an organic layer, disposed between the anode and the cathode, the organic layer further comprising a compound selected from the group consisting of:

A method for making heteroleptic compounds, comprising:

• reacting
• with
• to form
• wherein S is a neutral ligand;
• wherein X is a counterion;
• wherein A and B are each independently a 5 or 6-membered aromatic or heteroaromatic ring, and A-B represents a bonded pair of aromatic or heteroaromatic rings coordinated to the iridium via a nitrogen atom on ring A and an sp2 hybridized carbon atom on ring B;
• wherein C and D are each independently a 5 or 6-membered aromatic or heteroaromatic ring, and C-D represents a bonded pair of aromatic or heteroaromatic rings coordinated to the iridium via a nitrogen ring atom on ring C and an sp2 hybridized carbon atom on ring D;
• wherein RA, RB, RC, and RD are each independently selected from the group consisting of no substitution, alkyl, heteroalkyl, aryl, or heteroaryl groups;
• wherein each of RA, RB, RC, and RD represent one or more substituents;
• and
• wherein RZ is not H.

A heteroleptic complex having the formula Ir(LA-B)2(LC-D),

• wherein LA-B is
• wherein LC-D is selected from the group consisting of
• and
• wherein R1, R2, R3, R4 and R5 are each independently selected from the group consisting of hydrogen and alkyl;
• and
• wherein each of R1, R2, R3, R4 and R5 may represent mono, di, tri, tetra, or penta substitutions.