Organic electroluminescent materials and devices

A first device comprising a first organic light emitting device which comprises:

• an anode;
• a cathode;
• and
• an organic layer disposed between the anode and the cathode,
• the organic layer comprising a compound having Formula (II):
• wherein rings A1, A2, and A3 are independently five- or six-membered carbocyclic or heterocyclic aromatic rings having 0-3 nitrogen atoms and 0-1 additional heteroatoms selected from the group consisting of oxygen, sulfur, and selenium;
• Z1 and Z2 are independently carbon or nitrogen;
• wherein R2 represents mono- or di-substitution, wherein each R2 is selected independently from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof, and wherein any two adjacent R2 may optionally combine to form a ring, which can be further substituted;
• wherein R3 represents mono-, di-, tri-, or tetra-substitution, wherein each R3 is selected independently from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof, and wherein any two adjacent R3 may optionally combine to form a ring, which can be further substituted;
• wherein G1is O or CR4R5;
• wherein R4 and R5 are independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof, and wherein R4 and R5 may optionally combine to form a ring, which can be further substituted;
• wherein any of R4 or R5 may optionally combine with any R2 or R3 to form a ring system, which can be further substituted;
• wherein R6 represents mono-, di-, or tri-substitution, wherein each R6 is selected independently from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof, and wherein any two adjacent R6 may optionally combine to form a ring, which can be further substituted;
• wherein R7 and R8 represent mono-, di-, tri-, or tetra-substitution, wherein each R7 or R8 is selected independently from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof, and wherein any two adjacent R7 or any two adjacent R8 may optionally combine to form a ring, which can be further substituted;
• wherein any R3 may optionally combine with any R6 to form a ring system, which can be further substituted;
• wherein any R2 may optionally combine with any R8 to form a ring system, which can be further substituted;
• and
• wherein any R6 may optionally combine with any R7 to form a ring system, which can be further substituted;
• wherein any R7 may optionally combine with any R8 to form a ring system, which can be further substituted.