Patent ID: 8221905

Claim:
A carbazole-containing compound comprising: wherein a is 1 to 20; wherein b is 0 to 20; wherein m is 0 to 2; wherein n is 0 to 2; wherein m+n is at least 1; wherein X is selected from the group consisting of biphenyl, terphenyl, naphthalene, triphenylene, phenanthrene, fluorene, chrysene, dibenzothiophene, dibenzofuran, benzofuran, benzothiophene, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, indole, benzimidazole, indazole, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, phenothiazine, phenoxazine, benzofuropyridine, furodipyridine, benzothienopyridine, and thienodipyridine; and wherein X is substituted by R, where R is selected from the group consisting of hydrogen, alkyl, heteroalkyl, benzene, biphenyl, terphenyl, naphthalene, phenalene, phenanthrene, fluorene, chrysene, dibenzothiophene, dibenzofuran, benzofuran, benzothiophene, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, indole, benzimidazole, indazole, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, phenothiazine, phenoxazine, benzofuropyridine, furodipyridine, benzothienopyridine, and thienodipyridine.