Journal ArticleDOI
(CdSe)ZnS Core-Shell Quantum Dots - Synthesis and Characterization of a Size Series of Highly Luminescent Nanocrystallites
B. O. Dabbousi,Javier Rodríguez-Viejo,F. V. Mikulec,Jason Heine,Hedi Mattoussi,R. Ober,K. F. Jensen,‡,§ and,Moungi G. Bawendi +7 more
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TLDR
In this paper, a synthesis of highly luminescent (CdSe)ZnS composite quantum dots with CdSe cores ranging in diameter from 23 to 55 A was reported.Abstract:
We report a synthesis of highly luminescent (CdSe)ZnS composite quantum dots with CdSe cores ranging in diameter from 23 to 55 A. The narrow photoluminescence (fwhm ≤ 40 nm) from these composite dots spans most of the visible spectrum from blue through red with quantum yields of 30−50% at room temperature. We characterize these materials using a range of optical and structural techniques. Optical absorption and photoluminescence spectroscopies probe the effect of ZnS passivation on the electronic structure of the dots. We use a combination of wavelength dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, small and wide angle X-ray scattering, and transmission electron microscopy to analyze the composite dots and determine their chemical composition, average size, size distribution, shape, and internal structure. Using a simple effective mass theory, we model the energy shift for the first excited state for (CdSe)ZnS and (CdSe)CdS dots with varying shell thickness. Finally, we characterize the...read more
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Probing Wave Functions at Semiconductor Quantum-Dot Surfaces by Non-FRET Photoluminescence Quenching
TL;DR: In this article, the quenching rate of colloidal CdSe/ZnS quantum dots induced by functionalized porphyrin molecules was investigated for various QD sizes.
Journal ArticleDOI
Sub-10-nm fabrication: methods and applications
TL;DR: In this paper, a systematic review of sub-10 nm fabrication methods and their related applications is presented, which can be classified into three main approaches, including lithographic, mechanics-enabled, and post-trimming.
Journal ArticleDOI
Synthesis, characterization and luminescence properties of thiol-capped CdSe quantum dots at different processing conditions
Waleed E. Mahmoud,S.J. Yaghmour +1 more
TL;DR: In this article, the effect of different processing conditions and surface passivation on the growth and luminescence of CdSe quantum dots (QDs) was investigated by pyrolysis of thiol reagents.
Patent
Highly luminescent color-selective materials
TL;DR: A coated nanocrystal capable of light emission includes a substantially monodisperse nanoparticle selected from the group consisting of CdX, where X = S, Se, Te and an overcoating of ZnY, uniformally deposited thereon, said coated nanoparticle charaterized in that when irradiated the particles exhibit photoluminescence in a narrow spectral range of no greater than about 60 nm, and most preferably 40 nm at full width half max (FWHM) as discussed by the authors.
Journal ArticleDOI
In vivo assessment of CdSe-ZnS quantum dots: coating dependent bioaccumulation and genotoxicity.
Antonio Galeone,Giuseppe Vecchio,Maria Ada Malvindi,Virgilio Brunetti,Roberto Cingolani,Pier Paolo Pompa +5 more
TL;DR: Evaluated in vivo the long-term toxicity of CdSe-ZnS QDs with different surface coatings found that all the differently coated QDs significantly affect the lifespan of treated Drosophila populations and induce a marked increase in reactive oxygen species (ROS) levels.
References
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Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites
TL;DR: In this paper, a simple route to the production of high-quality CdE (E=S, Se, Te) semiconductor nanocrystallites is presented, based on pyrolysis of organometallic reagents by injection into a hot coordinating solvent.