Redispersible conductive core-shell nano-particles with a polystyrene core and a polystyrene sulfonate shell loaded with polypyrrole (PPy) are constructed. The smooth conducting thin films assembled from the PPy core-shell nanoparticles show high transmittance in the visible range and adequate adhesion to the substrates. Performance of light-emitting devices with the conducting thin film as the hole injection layer is tested and compared with the one based on PEDOT/PSS.