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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Non-heavy-metal ZnS quantum dots with bright blue photoluminescence by a one-step aqueous synthesis
Hui Li,Wan Y. Shih,Wei-Heng Shih +2 more
TL;DR: In this paper, the authors examined the aqueous synthesis of non-heavy-metal ZnS quantum dots (QDs) using 3-mercaptopropionic acid (MPA) as the capping molecule at various pH and MPA:Zn:S ratios.
Journal ArticleDOI
Large-area (over 50 cm × 50 cm) freestanding films of colloidal InP/ZnS quantum dots.
Evren Mutlugun,Pedro Ludwig Hernandez-Martinez,Pedro Ludwig Hernandez-Martinez,Cuneyt Eroglu,Yasemin Coskun,Talha Erdem,Vivek Sharma,Emre Unal,Subhendu K. Panda,Stephen G. Hickey,Nikolai Gaponik,Alexander Eychmüller,Hilmi Volkan Demir,Hilmi Volkan Demir +13 more
TL;DR: The fabrication of flexible, freestanding films of InP/ZnS quantum dots (QDs) using fatty acid ligands across very large areas, which have been developed for remote phosphor applications in solid-state lighting, are proposed and demonstrated.
Journal ArticleDOI
Influence of Acid on Luminescence Properties of Thioglycolic Acid-Capped CdTe Quantum Dots
Abhijit Mandal,Naoto Tamai +1 more
TL;DR: In this paper, the authors systematically optimized the synthesis conditions and found that the pH value significantly affected the optical properties of CdTe quantum dots (QDs) and extended their observation to check the effect of pH level on different sizes of QDs.
Journal ArticleDOI
Chemical Mechanisms of Semiconductor Nanocrystal Synthesis
TL;DR: A review of metal-chalcogenide (ME) semiconductor quantum dots can be found in this article, where the focus is on the initial metal-chamber-chain bond formation and growth models for QDs.
Journal ArticleDOI
A multifunctional polymer combining the imidazole and zwitterion motifs as a biocompatible compact coating for quantum dots.
TL;DR: QDs cap-exchanged with folic acid-functionalized ligands could effectively target cancer cells, where folate-receptor-mediated endocytosis of QDs into living cells was time- and concentration-dependent.
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.