The first examples of the dye-coated semiconducting polymer nanoparticles as well as experiments to demonstrate the excitation energy transfer from the excited chromophor of the nanoparticle to the fluorescent dye are described. We have demonstrated that the blue fluorescence of the dye-coated polyfluorene nanoparticles is only slightly quenched after dye deposition. However, a new emission band of the surface-bound dye (Rhodamine 6G or Rhodamine TM) appears in the wavelength region of 530-600 nm. These results clearly indicate an effective excitation energy transfer from the excited PF chromophores to the fluorescent dye.