A new class of highly fluorescent and stable carbazole-based first generation dendrimers (1-5) is synthesized and characterized. Compounds 1-5 contain the ethynylbenzene and diethynylbenzene cores. They show very high extinction coefficients of absorption ( ~ 328-353 nm) and high quantum yields of fluorescence ( ~ 386-437 nm; ~ 0.72-0.89;  ~ 2.09-3.91 ns) in dichloromethane. The quantum yields of fluorescence of 1-5 in the solid state are equally high ( ~ 385-422 nm;  ~ 0.55-0.85). These data indicate their potential use as blue materials in organic light-emitting diodes (OLEDs). The synthesis of the second generation of similar dendrimers is underway.