A series of N-diaryl-anthracene-9, 10-diamine derivatives with methyl substituents at meta or para position of N-diaryl rings were synthesized and used as dopants for Organic Light- Emitting Devices (OLED). The effects of substituted methyl substituents have been compared based on both materials and solid device evaluation. The performance of solid state devices in the configuration of ITO/N, N′-bis (naphthalene-1-yl)-N, N′-bis (phenyl) ...