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
Reads0
Chats0
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
Citations
More filters
Journal ArticleDOI
Quantum-Dot-Based Solar Cells: Recent Advances, Strategies, and Challenges
Mee Rahn Kim,Dongling Ma +1 more
TL;DR: The attractive advantages of QDs, such as size-tunable band gaps and multiple exciton generation (MEG), beneficial to solar cell applications are reviewed and major strategies, which have been extensively explored and have largely contributed to the most recent and significant achievements in QD solar cells, are analyzed.
Journal ArticleDOI
Bright and Stable Purple/Blue Emitting CdS/ZnS Core/Shell Nanocrystals Grown by Thermal Cycling Using a Single-Source Precursor
TL;DR: In this paper, a new approach for synthesis of high quality core/shell nanocrystals, "thermal-cycling coupled single precursor" (TC-SP), was developed.
Journal ArticleDOI
Doping Mesoporous Materials with Multicolor Quantum Dots
Xiaohu Gao,Shuming Nie +1 more
TL;DR: In this paper, the doping of mesoporous silica beads has been achieved with luminescent quantum dots, leading to 1−2 orders of magnitude improvements over the results previously achieved with polystyrene latex beads.
Journal ArticleDOI
Quantum dots - nano-sized probes for the exploration of cellular and intracellular targeting.
TL;DR: This review will not only describe the ideal attributes of QDs for biological applications and imaging but also their distinct specific and non-specific pathways into the cells as well as their intracellular fate.
Journal ArticleDOI
Aqueous-phase synthesis of highly luminescent CdTe/ZnTe core/shell quantum dots optimized for targeted bioimaging.
TL;DR: The fabrication and applications of cysteine-capped CdTe/ZnTe QDs, which are directly synthesized in aqueous media, as optical probes for specific targeting of pancreatic and esophageal cancer cells in vitro are reported, as well as their capability for in vivo imaging.
References
More filters
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.