title: Ionic liquid-assisted route to nanocrystalline single-phase phosphors for white light-emitting diodes.
abstract: White light-emitting diodes represent the future generation of domestic and public lighting, substituting the currently favored (compact) fluorescent lamps. Research on improving the performance and costs leads to a focus on processing constraints. The optimization of the grain size is judged to be an important tool for minimizing the necessary amount of (expensive rare-earth containing) phosphors. Using only one type of phosphor that emits white light instead of a mixture of three phosphors (one for blue, green, and red, respectively) will significantly improve the characteristics of future light-emitting diodes. Small, 6-8 nm-sized particles emit intense white light observable by the naked eye. The emission color has been studied by varying the dopant ion concentrations as well as the excitation wavelengths, yielding white light close to standard daylight.
authors.affiliation: Anorganische Chemie III, Ruhr-Universität Bochum, Universitätsstr. 150, 44801 Bochum (Germany), Fax: (+49) 234-32-14951; Critical Materials Institute, Ames Laboratory, and Materials Science and Engineering Department, Iowa State University, Ames, IA (USA).
authors.forename: Chantal
authors.initials: C
authors.lastname: Lorbeer
authors.forename: Anja-Verena
authors.initials: AV
authors.lastname: Mudring
mesh_terms: D003116:Color; D004419:Dysprosium / Q000737:chemistry; D005459:Fluorides / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry; D008027:Light; D008029:Lighting; D053758:Nanoparticles / Q000737:chemistry*; D013932:Thulium / Q000737:chemistry
chemical_list: C419324:1-butyl-3-methylimidazolium tetrafluoroborate; D007093:Imidazoles; D052578:Ionic Liquids; D004419:Dysprosium; D007811:Lanthanum; D013932:Thulium; D005459:Fluorides
keywords: fluorides; ionic liquids; light-emitting diodes; nanoparticles; white emitter