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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Preparation‐Condition Dependence of Hybrid SiO2‐Coated CdTe Nanocrystals with Intense and Tunable Photoluminescence
Ping Yang,Norio Murase +1 more
TL;DR: In this paper, aqueously prepared CdTe nanocrystals (NCs) are coated with a SiO 2 shell containing Cd ions and a sulfur source, they show a drastic increase in photoluminescence (PL) efficiency with a significant red shift and spectral narrowing after reflux.
Journal ArticleDOI
InP Quantum Dots: An Environmentally Friendly Material with Resonance Energy Transfer Requisites
TL;DR: In this article, three chromophoric dyes, namely, lissamine rhodamine B ethylene diamine (LiRh), Texas red cadavarine C5 (TxRed), and rhodamines 101 (Rh101), possessing free anchoring groups were used as acceptors in InP quantum dot (QD)-based donor-acceptor pairs.
Journal ArticleDOI
The chemical fate of the Cd/Se/Te-based quantum dot 705 in the biological system: toxicity implications.
Chia-Hua Lin,Louis W. Chang,Han Chang,Mo-Hsiung Yang,Chung-Shi Yang,Wan-Hau Lai,Wan-Hsuan Chang,Pinpin Lin +7 more
TL;DR: It is demonstrated that free Cd indeed can be released from QD705 in the kidneys and increases the risk of renal toxicity and is not as stable or biologically inert as many may have once believed.
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Photoexcited carrier dynamics in colloidal quantum dot solar cells: insights into individual quantum dots, quantum dot solid films and devices
TL;DR: The recent research including photoexcited multiple exciton generation (MEG), hot electron extraction, and carrier transfer between adjacent QDs, as well as carrier injection and recombination at each interface of QDSCs are discussed in detail herein.
Journal ArticleDOI
Size-controlled synthesis of gold nanoparticles via high-temperature reduction.
TL;DR: A single-step synthesis of Au nanoparticles 4−15 nm in diameter and with low polydispersity is presented, whereine-induced reduction of a Au(I) precursor in the presence of coordinating ligands leads to nucleation of small particles which ripen to form larger particles.
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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.