For the purpose of developing new-typed multifunctional composite microbelts, novel color-tunable composite microbelts endowed with simultaneously tuned electricity-magnetism performance have been successfully fabricated via facile one-pot electrospinning technology. The obtained trifunctional composite microbelts are composed of polymethyl methacrylate (PMMA) as the matrix, Tb(BA)(3)phen and Eu(BA)(3)phen (BA = benzoic acid, phen = phenanthroline) complex as luminescence materials, Fe3O4 nanoparticles (NPs) as magnetic materials and polyaniline (PANI) as electrically conductive material. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), vibrating sample magnetometry (VSM), fluorescence spectroscopy and Hall effect measurement system are used to characterize the morphology, structure and properties of the [Tb(BA)(3)phen + Eu(BA)(3)phen]/PANI/Fe3O4/PMMA composite microbelts. The results indicate that the trifunctional composite microbelts possess excellent fluorescence, saturation magnetization and electrical conduction. The emitting color of the composite microbelts can be tuned by adjusting the mass ratios of Tb(BA)(3)phen, Eu(BA)(3)phen, Fe3O4 and PANI in a wide color range of red-yellow-green under the excitation of 306-nm single-wavelength ultraviolet light. The electrical conductivity and saturation magnetization of the composite microbelts can be respectively tunable by adding various amounts of PANI and Fe3O4 NPs. The trifunctional composite microbelts are expected to possess many potential applications in areas such as full-color display, electromagnetic shielding, molecular electronics, anti-counterfeit materials and biomedicine. (C) 2015 Elsevier B.V. All rights reserved.