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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Type-I and type-II nanoscale heterostructures based on CdTe nanocrystals: a comparative study.
Dirk Dorfs,Thomas Franzl,Ruth Osovsky,Maya Brumer,Efrat Lifshitz,Thomas A. Klar,Alexander Eychmüller +6 more
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Influence of Solution Chemistry on the Deposition and Detachment Kinetics of a CdTe Quantum Dot Examined Using a Quartz Crystal Microbalance
TL;DR: Physicochemical characterization of the QD suspended in varying electrolytes provided insights into the role of solution chemistry on particle size and electrophoretic mobility(surface charge) and lower particle deposition rates observed at high ionic strengths were attributed to aggregation of QDs resulting in decreased convective-diffusive transport to the silica surface.
Journal ArticleDOI
Luminescence and growth of CdTe quantum dots and clusters
TL;DR: In this paper, high luminescent CdTe quantum dots (QDs) were synthesized in a mixture of TOP and DDA and the growth of the particles in the reaction mixture was followed in time for three different temperatures.
Journal ArticleDOI
Interplay between optical gain and photoinduced absorption in CdSe nanocrystals
Anton V. Malko,Alexander Mikhailovsky,Melissa A. Petruska,Jennifer A. Hollingsworth,Victor I. Klimov +4 more
TL;DR: In this article, a potential complication associated with the realization of the optical gain regime in semiconductor nanocrystals (NCs) arises from the competing phenomenon of excited-state absorption.
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Surface State Analysis of Photobrightening in CdSe Nanocrystal Thin Films
TL;DR: In this paper, the changes in surface state of tri-n-octylphosphine oxide (TOPO) capped CdSe nacocrystals by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) were reported.
References
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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.