A novel conjugated neutral surfactant poly[9,9-bis(6 '-(diethanolamino)hexyl)-fluorene] (PFN-OH; see figure) has been developed as an efficient electron-injection material for fabricating highly efficient multilayer polymer light-emitting diodes. Compared to the traditional neutral surfactants used, PFN-OH possesses the combined advantages of good conductivity and excellent electron-injection ability from high-work-function metals (e.g., Al, Ag, or Au).