Organic light emitting diodes (OLEDs) have recently received intense research interst due to their low power consumption, high contrast and brightness, easy fabrication, and ability to render a wide range of colors in flat panel displays and lighting fixtures. In this study, a series of novel HTMs based on triphenylamine cores end capped with carbazole and triarylamine derivatives has been synthesized and investigated with very high Tg and Td values. The devices demonstrated good performance that was comparable to that of NPB overall.