A new polyquinoline PQSP containing spirobifluorene and phenathiazine units was synthesized through the acid-catalyzed Friedldnder condensation. PQSP showed strong yellow emission in solution and film. Excellent EL performances were obtained for PQSP. The devices based on PQSP showed a maximum external quantum efficiency of 0.63% and a maximum photometric efficiency of 1.85 cd/A. Pure yellow-green EL with narrow full width at the half-maximum (fwhm < 70 nm) and the highest maximum luminance (1768 cd/m(2)) among the currently reported polyquinolines was obtained for PQSP.