Organic electroluminescent materials and devices

A device comprising one or more organic light emitting devices, at least one of the one or more organic light emitting devices comprising:

• an anode;
• a cathode;
• and
• an organic layer, disposed between the anode and the cathode, comprising a compound having Formula I:
• wherein X is selected from a group consisting of 0, S and Se;
• wherein G2 and G3 are each independently selected from the group consisting of benzene, biphenyl, fluorene, naphthalene, phenanthrene, triphenylene, dibenzofuran, dibenzothiophene, dibenzoselenophene, pyridine, pyrimidine, quinoline, isoquinoline, phenanthroline, aza-fluorene, and combinations thereof;
• wherein L is selected from the group consisting of phenyl, biphenyl, terphenyl and pyridine, and combinations thereof;
• wherein G2, G3 and L are each optionally further substituted with one or more unfused substituents selected from the group consisting of deuterium, alkyl, alkoxyl, cycloalkyl, cycloalkoxyl, halogen, nitro, nitrile, silyl, benzene, biphenyl, terphenyl, pyridine, and combinations thereof;
• wherein R3 represents mono, di, tri, or tetra substitution, or no substitution;
• wherein R4, R5 and R6 each independently represent mono, di, or tri substitution, or no substitution;
• wherein R1, R2, and each R3, R4, R5 and R6 are an unfused substituent selected from the group consisting of hydrogen, deuterium, alkyl, alkoxyl, cycloalkyl, cycloalkoxyl, halogen, nitro, nitrile, silyl, benzene, biphenyl, terphenyl, pyridine, and combinations thereof;
• and
• wherein R1 and R2 are optionally joined to form a ring.

A composition of materials comprising a first compound and a second compound,

• wherein the first compound has a structure of Formula I:
• wherein X is selected from a group consisting of O, S and Se,
• wherein G2 and G3 are each independently selected from the group consisting of benzene, biphenyl, fluorene, naphthalene, phenanthrene, triphenylene, dibenzofuran, dibenzothiophene, dibenzoselenophene, pyridine, pyrimidine, quinoline, isoquinoline, phenanthroline, aza-fluorene, and combinations thereof,
• wherein L is selected from the group consisting of phenyl, biphenyl, terphenyl and pyridine, and combinations thereof,
• wherein G2, G3 and L are each optionally further substituted with one or more unfused substituents selected from the group consisting of deuterium, alkyl, alkoxyl, cycloalkyl, cycloalkoxyl, halogen, nitro, nitrile, silyl, benzene, biphenyl, terphenyl, pyridine, and combinations thereof,
• wherein R3 represents mono, di, tri, or tetra substitution, or no substitution,
• wherein R4, R5 and R6 each independently represent mono, di, or tri substitution, or no substitution,
• wherein R1, R2, and each R3, R4, R5 and R6 are an unfused substituent selected from the group consisting of hydrogen, deuterium, alkyl, alkoxyl, cycloalkyl, cycloalkoxyl, halogen, nitro, nitrile, silyl, benzene, biphenyl, terphenyl, pyridine, and combinations thereof, and
• wherein R1 and R2 are optionally joined to form a ring;
• and
• wherein the second compound has a structure of Formula III:
• wherein X is selected from the group consisting of S, O, Se, and NR′,
• wherein L2 is selected from a group consisting of direct bond, phenyl, biphenyl, terphenyl, fluorene, triphenylene, dibenzofuran, dibenzothiophene, dibenzoselenophene, carbazole and pyridine, and combinations thereof,
• wherein L2 is optionally further substituted with one or more substituents selected from a group consisting of hydrogen, deuterium, alkyl, alkoxyl, cycloalkyl, cycloalkoxyl, halogen, nitro, nitrile, silyl, aryl, heteroaryl, and combinations thereof,
• wherein R′, R7, R8, R9, R10 and R11 are each an unfused substituent selected from the group consisting of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, sulfanyl, sulfanyl, sulfonyl, phosphino, and combinations thereof,
• wherein R7, R8 and R11 each independently represent mono, di, tri, or tetra substitution, or no substitution, and
• wherein R9 and R10 each independently represent mono, di, or tri substitution, or no substitution.