Organic electroluminescent materials and devices

An organic light emitting device (OLED) comprising:

• an anode;
• a cathode;
• and
• an organic layer, disposed between the anode and the cathode, comprising a compound having a formula selected from the group consisting of Formula I and Formula II:
• wherein in Formula I, m is an integer from 0 to 20;
• when m is more than 1, each R7 and R8 can be same or different;
• R1 to R8 are each independently selected from the group consisting of hydrogen, deuterium, halogen, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
• wherein the heteroaryl group is selected from the group consisting of pyridine, pyrimidine, pyrazine, furan, thiophene, imidazole, oxazole, thiazole, carbazole, benzothiophene, dibenzothiophene, benzofuran, dibenzofuran, dibenzoselenophene, aza-triphenylene, aza-fluorene, aza-carbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene;
• and
• at least one of R1 to R8 comprises at least one chemical group selected from the group consisting of naphthalene, phenanthrene, pyridine, pyrimidine, pyrazine, furan, thiophene, imidazole, oxazole, thiazole, triphenylene, fluorene, benzothiophene, dibenzothiophene, benzofuran, dibenzofuran, dibenzoselenophene, aza-triphenylene, aza-fluorene, aryl substituted with aza-carbazole, aza-dibenzothiophene, aza-dibenzofuran, aza-dibenzoselenophene, and
• wherein X is NR and R is selected from the group consisting of hydrogen, deuterium, halogen, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
• wherein in Formula II n is an integer from 1 to 10;
• when n is more than 1, each R7 and R8 can be same or different;
• R1 to R8 are each independently selected from the group consisting of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
• wherein the heteroaryl group is selected from the group consisting of pyridine, pyrimidine, pyrazine, furan, thiophene, imidazole, oxazole, thiazole, carbazole, benzothiophene, dibenzothiophene, benzofuran, dibenzofuran, dibenzoselenophene, aza-triphenylene, aza-fluorene, aza-carbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene;
• and
• wherein in Formula II, at least one of R1 to R8 comprises triphenylene or comprises a phenyl substituted with at least one chemical group selected from the group consisting of naphthalene, phenanthrene, pyridine, pyrimidine, pyrazine, furan, thiophene, imidazole, oxazole, thiazole, triphenylene, fluorene, carbazole, benzothiophene, dibenzothiophene, benzofuran, dibenzofuran, dibenzoselenophene, aza-triphenylene, aza-fluorene, aza-carbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene.