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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Multifunctional nanoparticles as biocompatible targeted probes for human cancer diagnosis and therapy
TL;DR: The engineering of multifunctional nanoparticle probes and their use in bioimaging and nanomedicine is discussed and they can be used for traceable drug delivery with high affinity and specificity.
Journal ArticleDOI
Semiconductor nanocrystals for biological imaging
Aihua Fu,Weiwei Gu,Carolyn A. Larabell,Carolyn A. Larabell,A. Paul Alivisatos,A. Paul Alivisatos +5 more
TL;DR: Semiconductor nanocrystals are one of the first examples of nanotechnology enabling a new class of biomedical applications, including multiplexed cellular imaging, long-term in vitro and in vivo labeling, deep tissue structure mapping and single particle investigation of dynamic cellular processes.
Journal ArticleDOI
Recent progress in the synthesis of inorganic nanoparticles
C. N. R. Rao,C. N. R. Rao,H. S. S. Ramakrishna Matte,Rakesh Voggu,A. Govindaraj,A. Govindaraj +5 more
TL;DR: This article includes a brief discussion of methods followed by reports on the synthesis of nanoparticles of various classes of inorganic materials such as metals, alloys, oxides chalcogenides and pnictides.
Journal ArticleDOI
ZnTe/ZnSe (Core/Shell) Type-II Quantum Dots: Their Optical and Photovoltaic Properties
Jiwon Bang,Juwon Park,Ji Hwang Lee,Nayoun Won,Jutaek Nam,Jongwoo Lim,Byoung Yong Chang,Hyo Joong Lee,Bonghwan Chon,Junghan Shin,Jae Byung Park,Jong Hwa Choi,Kilwon Cho,Su Moon Park,Taiha Joo,Sungjee Kim +15 more
TL;DR: In this paper, a size series of colloidal ZnTe/ZnSe (core/shell) quantum dots (QDs) was synthesized, showing photoluminescence (PL) from blue to amber.
Journal ArticleDOI
Light Amplification Using Inverted Core/Shell Nanocrystals: Towards Lasing in the Single-Exciton Regime
Sergei A. Ivanov,Jagjit Nanda,Andrei Piryatinski,Marc Achermann,Laurent Balet,Ilia V. Bezel,Polina Anikeeva,Sergei Tretiak,Victor I. Klimov +8 more
TL;DR: In this paper, the authors explore a novel approach to achieve NC lasing in the Auger-recombination-free regime by using type II NC heterostructures that promote spatial separation of electrons and holes.
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.