We report the preparation of a new electroluminescent polymer by the oxidative coupling copolymerization of N-(4-n-butylphenyl)phenoxazine and 9,9-di-n-butylfluorene with ferric(III) chloride. The reaction yields soluble polymers with a weight-average molecular weight as high as 9000. The reactivity has been studied with respect to the reaction time, temperature, and feed ratio of the comonomers. Under optimum conditions, a copolymer with a 50% comonomer incorporation ratio can be obtained in a 75% yield. The polymers have been characterized with differential scanning calorimetry, cyclic voltammetry, and optical spectroscopy. A simple single-layer light-emitting-diode device of an indium tin oxide/polymer/Mg-Ag structure shows a luminance of 200 cd/m(2) at an 18-V operating voltage. (c) 2006 Wiley Periodicals, Inc.