title: Highly photoluminescent nanocrystals based on a gold(I) complex and their electrophoretic patterning.
abstract: The fabrication of nanocrystals (NCs) composed of the cationic Au(I) complex was demonstrated by the reprecipitation method in which the colloidal solution of the NCs showed brilliant green phosphorescence with a quantum yield of 83% in n-hexane. Characterization of the prepared NCs was performed by transmission electron microscopy observation and elemental analysis with energy-dispersive X-ray spectroscopy. The obtained Au(I) NCs were particles of random shapes with a diameter of 200-400 nm. The selected-area electron diffraction and X-ray diffraction measurements showed the characteristic diffraction patterns attributable to the crystal structure of the bulk crystal of the Au(I) complex. A similar method was performed with a different counteranion, leading to a colloidal solution of the microcrystals (MCs) with brilliant yellow phosphorescence and a quantum yield of 26% in n-hexane. Luminescence patterning of the NCs and MCs was also achieved successfully by electrophoretic deposition onto an indium tin oxide (ITO)-coated glass substrate, resulting in characteristic luminescence patterns on the ITO substrates with relatively high photoluminescence quantum yields.
authors.affiliation: Graduate School of Materials and Science, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Saitoh
authors.forename: Alan L
authors.initials: AL
authors.lastname: Balch
authors.forename: Junpei
authors.initials: J
authors.lastname: Yuasa
authors.forename: Kazuya
authors.initials: K
authors.lastname: Tada
authors.forename: Mitsuyoshi
authors.initials: M
authors.lastname: Onoda
authors.forename: Takuya
authors.initials: T
authors.lastname: Nakashima
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Kawai
mesh_terms: D004586:Electrophoresis; D008163:Luminescent Measurements; D049329:Nanostructures / Q000737:chemistry*; D050607:Organogold Compounds / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D050607:Organogold Compounds