Investigation of novel carbazole-functionalized coumarin derivatives as organic luminescent materials

Four new carbazole-coumarin hybrids (Cz-Ph-C, Cz-2(Ph-C), Cz-Th-C and Cz-2(Th-C)) were successfully synthesized as the emissive materials for organic light-emitting devices. The vacuum-processed doped devices were fabricated. The devices with Cz-Ph-C (10 wt%) displayed the best performance with a maximum brightness of 12910 cd/m2 and a maximum luminous efficiencies of 7.39 cd/A and a maximum external quantum efficiency (EQE) of 3.36%.101