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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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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Stability of Quantum Dots, Quantum Dot Films, and Quantum Dot Light-Emitting Diodes for Display Applications
TL;DR: As understanding of the degradation mechanisms of QDs increases and more stable QDs and display devices are developed, QDs are expected to play critical roles in advanced display applications.
Journal ArticleDOI
Colloidal quantum dot light-emitting devices
Vanessa Wood,Vladimir Bulovic +1 more
TL;DR: The challenges facing QD-LED development are outlined, and how optical downconversion schemes have enabled researchers to overcome these challenges and develop commercial lighting products that incorporate QDs to achieve desirable color temperature and a high CRI while maintaining efficiencies comparable to inorganic white LEDs is described.
Journal ArticleDOI
Photooxidation and Photobleaching of Single CdSe/ZnS Quantum Dots Probed by Room-Temperature Time-Resolved Spectroscopy
Wilfried van Sark,P. L. T. M. Frederix,and Dave J. Van den Heuvel,Hans C. Gerritsen,Ageeth A. Bol,Joost N. J. van Lingen,and Celso de Mello Donegá,Andries Meijerink +7 more
TL;DR: The room-temperature luminescence of single CdSe/ZnS core−shell quantum dots was investigated by spectrally and temporally resolved confocal microscopy.
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Properties of Fluorescent Semiconductor Nanocrystals and their Application to Biological Labeling
Xavier Michalet,Fabien Pinaud,Thilo D. Lacoste,Maxime Dahan,Marcel P. Bruchez,A. Paul Alivisatos,Shimon Weiss +6 more
TL;DR: A review of the development of colloidal fluorescent semiconductor nanocrystals (a class of quantum dots) for biological labeling can be found in this paper, where the authors describe how to take advantage of nanocrystal spectral properties to increase the resolution of fluorescence microscopy measurements down to the nanometer level.
Journal ArticleDOI
Additive manufacturing (AM) and nanotechnology: promises and challenges
TL;DR: A review of available published literature in which nanostructures are incorporated into AM printing media as an attempt to improve the properties of the final printed part is provided in this paper.
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Journal ArticleDOI
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.