Browsing by Subject "Energy exchange"
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Item Open Access Enhanced spontaneous emission in semiconductor nanocrystal solids using resonant energy transfer for integrated devices(IEEE, 2008-11) Nizamoğlu, Sedat; Demir, Hilmi VolkanSize-tuneable optical properties of semiconductor nanocrystal (NC) quantum dots make them attractive for a wide range of device applications. However, in these device applications, nanocrystals typically suffer from relatively low quantum efficiency (QE) when they are cast into solid form. To reduce the effect of this problem, we propose and demonstrate the enhancement of spontaneous emission in nanocrystal solids by recycling their trapped excitons through resonant nonradiative Forster energy transfer (ET) for hybrid integrated devices. For this purpose, we designed closely packed CdSe/ZnS core/shell nanocrystal emitters with an energy gradient of approximately 160 meV integrated on LEDs.Item Open Access Increased quantum efficiency and reduced red-shift in polymer nanoparticle luminophors(IEEE, 2008-11) Huyal, İlkem Özge; Özel, Tuncay; Tuncel, Dönüş; Demir, Hilmi VolkanIn this paper, using a polyfluorene derivative, increased fluorescence quantum efficiency and reduced red-shift in the film form of polymer nanoparticle luminophors is achieved, when compared to directly spin coated polymer thin films.Item Open Access Light-harvesting positively-charged nanocrystals for strong energy transfer to dye molecules(IEEE, 2008-11) Mutlugün, Evren; Demir, Hilmi VolkanIn this work, water-soluble positively-charged CdSe/ZnS core/shell nanocrystals were presented, serving as light harvester (donor) for strong energy transfer to rhodamine B dye molecules (acceptor) in solution. In accordance with photoluminescence (PL) characterization, the emission of rhodamine B was enhanced at the laser pump wavelength, which may open up possibilities for lasers based on dye molecules pumped at different wavelengths.