Organic electroluminescent materials and devices

A consumer product comprising a first organic light emitting device, the first organic light emitting device comprising:

• an anode;
• a cathode;
• and
• an organic layer, disposed between the anode and the cathode, comprising a compound having a Pt tetradentate structure, having the formula selected from the group consisting of:
• wherein rings C and D each independently represents aryl or heteroaryl;
• wherein RA, RB1, RC, and RD each independently represent mono, di, tri, tetra-substitution, or no substitution;
• wherein RB2 represents mono, di-substitution, or no substitution;
• wherein L1, L2, and L3 are each independently selected from the group consisting of a direct bond, BR, NR, PR, O, S, Se, C═O, S═O, SO2, SiRR′, GeRR′, alkyl, cycloalkyl, and combinations thereof;
• wherein n1 and n2 are each independently an integer of 1 or 0;
• the sum of n1 and n2 is at least 1;
• when n1 is 0, L1 is not present;
• and when n2 is 0, L2 is not present;
• wherein X is selected from the group consisting of NRE, O, S, and Se;
• wherein RA, RB1, RB2, RC, RD, RE, R, and R′ are each 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;
• wherein any adjacent RA, RB1, RC, RD, RE, R, and R′ are optionally joined to form a ring;
• wherein X3 and X4 each independently selected from the group consisting of carbon and nitrogen;
• wherein one of Q1, Q3, and Q4 is oxygen, the remaining two of Q1, Q3, and Q4 each represents a direct bond;
• and
• wherein the first organic light emitting device further comprises an electron blocking layer, a hole blocking layer, or both.