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3,6-Diphenyl-9H-carbazole, also known as 3,6-Diphenylcarbazole (DPhCz), is another electron-donating 9H-carbazole derivative that has an extended π-π conjugation from the carbazole fusion ring to the phenyl group attached to the 3,-6 position. The degree of electron donating strength is in the order of carbazole 3,6-dimethylcarbazole 3,6-diphenylcarbazole, resulting in the relatively red-shift of emissions of 3,6-dimethylcarbazole and 3,6-diphenylcarbazole while comparing non-substituted carbazoles.