Electroluminescence from nanoparticles/organic composites

We report the visible light emission of organic-inorganic light emitting devices by low-cost spin-coating. Different nanoparticles, CdSe, ZnO and Eu₂O₃, are employed to form organic-inorganic hybrid composites and generate the R-G-B and white light emission, while N,N´-diphenyl-N,N´-bis(3-methylphenyl)-1,1´-biphenyl-4,4´-diamine (TPD) and polymethyl methacrylate (PMMA) are adopted as the organic matrices. We further investigate the hybrid composite film by scanning near-field optical microscope and find that phase-segregation enhances the electroluminescence of ZnO composite film. Meanwhile, the homogeneity of the Eu₂O₃ composite film improves the white light emission.