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 Eu
₂
O
₃
, 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.