title: Quantum efficiency enhancement in film by making nanoparticles of polyfluorene.
abstract: We report on conjugated polymer nanoparticles of polyfluorene that were formed to exhibit higher fluorescence quantum efficiency in film (68%) and reduce undesired emission peak wavelength shifts in film (by 20 nm), compared to the solid-state polymer thin film made directly out of the same polymer solution without forming nanoparticles. Using the facile reprecipitation method, solutions of poly[9,9-dihexyl-9H-fluorene] in THF were added at different volume ratios to obtain different size distributions of nanoparticle dispersions in water. This allowed us to control the sizedependent optical emission of our polyfluorene nanoparticles. Such organic nanoparticles hold great promise for use as efficient emitters in optoelectronic device applications.
authors: Department of Physics, Nanotechnology Research Center, Institute of Materials Science and Nanotechnology, Bilkent University, Bilkent, Ankara, Turkey.
authors: Ilkem O
authors: IO
authors: Huyal
authors: Tuncay
authors: T
authors: Ozel
authors: Donus
authors: D
authors: Tuncel
authors: Hilmi V
authors: HV
authors: Demir
mesh_terms: D005449:Fluorenes / Q000737:chemistry*; D008567:Membranes, Artificial; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D011108:Polymers / Q000737:chemistry; D045663:Quantum Dots; D013050:Spectrometry, Fluorescence / Q000379:methods*; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D005449:Fluorenes; D008567:Membranes, Artificial; D011108:Polymers