Functional dyes could be dispersed into non-substituted poly(p-phenylene vinylene) (PPV), which shows a poor processability due to its insolubility and infusibility, by the vacuum process. Using this methods, it was possible to change the color of PPV from yellow to green with the blue dye, 1,4-(N,N'-diethylamino)anthraquinone (SV59). The fluorescence color of PPV could be changed from green to red by 2 min doping of 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM). Furthermore, a pattern doping with DCM could be carried out resulting in production of multicolored luminescent medium. (c) 2005 Elsevier B.V. All rights reserved.