As a new class of spin-coatable electroluminescent oligomers, oligo(N-ethylhexyl-3,6-carbazolylenevinylene-alt-4,4'-diphenyl-vinylene-sulfone) (P1 and oligo(N-ethylhexyl-3,6-carbazoledivinylene-p-phenylenevinylene) (P2) were synthesized through Wittig polycondensation of N-(2-ethylhexyl)-3,6-diformyl carbazole with the diphosphonium salts of bis(bromomethyl-p-phenyl)sulfone and alpha,alpha'-dibromo-p-xylene, respectively. These electroluminescent (EL) oligomers were highly soluble in common organic solvents, forming excellent-quality optical films by spin coating. Films obtained were very transparent, tough, and smooth with initial decomposition temperature of ca. 400 degreesC. Greenish-blue photoluminescence (PL) and electroluminescence (EL) was obtained for both oligomer films. It was found that the relative EL quantum efficiency of single-layer P1 device was five-fold higher than that of the P2 device, which was attributed to the lowered molecular energy levels of the former due to the presence of the sulfonylene group.