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A series of carbazole core-based hole-transporting materials (HTMs) have been synthesized using Buchwald-Hartwig amination reaction. HTMs 7a and 7b exhibited high thermal decomposition temperatures of 400 and 380 C, respectively, without any crystalline features. Among the designed HTMs 7a-c, the device performance based on HTM 7a is the best and identical with that of the typical holetransporting N,N 0 -di(1-naphthyl)-N,N 0 -diphenyl-(1,1 0 -biphenyl)-4,4 0 -diamine (NPB) material.