Phenyl and fluorenyl substituted phenyl-pyrazole complexes of Ir

A compound, having the structure:

• wherein
• M is Ir;
• (C—N) is a substituted or unsubstituted cyclometallated ligand, and (C—N) is different from at least one other ligand attached to the metal;
• each R8, R10, and R12 to R14 are H;
• m has a value of at least 1;
• n has a value of at least 1;
• and
• m+n is the maximum number of ligands that may be attached to the metal.

An organic light emitting device, comprising:

• (a) an anode;
• (b) a cathode;
• and
• (c) an emissive layer disposed between and electrically connected to the anode and the cathode, the emissive layer further comprising a compound having the structure
• wherein
• M is a metal having an atomic weight greater than 40;
• (C—N) is a substituted or unsubstituted cyclometallated ligand, and (C—N) is different from at least one other ligand attached to the metal;
• each R8, R10, and R12 to R14 is independently selected from hydrogen, alkyl, alkenyl, alkynyl, alkylaryl, CN, CF3, NO2, halo, aryl, heteroaryl, substituted aryl, substituted heteroaryl, or a heterocyclic group;
• additionally or alternatively, any two adjacent substituted positions together form, independently, a fused 4- to 7-member cyclic group, wherein said cyclic group is cycloalkyl, cycloheteroalkyl, aryl, or heteroaryl, and wherein the 4- to 7-member cyclic group may be optionally substituted with a substituent independently selected from hydrogen, alkyl, alkenyl, alkynyl, alkylaryl, CN, CF3, NO2, halo, aryl, heteroaryl, substituted aryl, substituted heteroaryl, or a heterocyclic group;
• m has a value of at least 1;
• n has a value of at least 1;
• and
• m+n is the maximum number of ligands that may be attached to the metal.

An organic light emitting device, comprising:

• (a) an anode;
• (b) a cathode;
• and
• (c) an emissive layer disposed between and electrically connected to the anode and the cathode, the emissive layer further comprising a compound having the structure
• wherein
• M is Ir;
• (C—N) is a substituted or unsubstituted cyclometallated ligand, and (C—N) is different from at least one other ligand attached to the metal;
• each R8, R10, and R12 to R14 are H;
• m has a value of at least 1;
• n has a value of at least 1;
• and
• m+n is the maximum number of ligands that may be attached to the metal.