title: Optical down-conversion in doped ZnSe:Tb3+ nanocrystals.
abstract: Rare earth (RE) Tb(3+)-doped high quality ZnSe nanocrystals (NCs) were synthesized by a facile chemical hot-injection method. ZnSe:Tb(3+) nanocrystals exhibited broadband absorption below the first excitonic absorption peak. Photoluminescence spectra showed Tb(3+) emission lines in the visible spectral window at room temperature when excited by UV radiation below the band-edge of the host ZnSe nanocrystals. Our experimental results indicate optical down-conversion in these Tb(3+)-doped Zn-chalcogenide nanocrystals via energy migration from host ZnSe to the Tb(3+) dopant. The host-dopant energy transfer mechanism for this ZnSe:Tb(3+) nanocrystal system is correlated with the emission spectra.
authors.affiliation: Department of Electrical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA.
authors.forename: Sandip
authors.initials: S
authors.lastname: Das
authors.forename: Krishna C
authors.initials: KC
authors.lastname: Mandal
mesh_terms: D004735:Energy Transfer; D008027:Light; D008163:Luminescent Measurements; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D018036:Selenium Compounds / Q000737:chemistry*; D013725:Terbium / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D018036:Selenium Compounds; D017967:Zinc Compounds; D013725:Terbium; C044696:zinc selenide