Journal ArticleDOI
High quality synthesis of monodisperse zinc-blende CdSe and CdSe/ZnS nanocrystals with a phosphine-free method
TLDR
In this paper, high-quality zinc blende CdSe nanocrystals have been synthesized by using different phosphine-free Se precursors successfully using different reaction mechanisms and growth temperatures.Abstract:
Highly monodisperse zinc blende CdSe nanocrystals have been synthesized by using different phosphine-free Se precursors successfully. To understand the reaction mechanism and obtain high quality CdSe nanocrystals, the effects on the use of different Se and/or Cd precursors, the adjustment of the molar ratios between Cd and Se precursors, and the selection of suitable reaction and growth temperatures have been studied in details. Absorption spectrum, fluorescence spectrum, X-ray diffraction (XRD), and transmission electron microscopy (TEM) were used for the characterization of synthesized CdSe nanocrystals. The quality of as-prepared CdSe nanocrystals was reached the same high level compared with the method using phosphine selenium precursors, its quantum yields were among 30 to 60% and photoluminescence (PL) full width at half-maximum (FWHM) was well controlled between 22 and 28 nm. As core, such zinc blende CdSe nanocrystals were also used to synthesize CdSe/ZnS, CdSe/CdS, and CdSe/CdS/ZnS core-shell nanocrystals. The quantum yields of as-prepared core-shell nanocrystals were among 50 to 80%. Large-scale syntheses of such core-shell nanocrystals have been successfully demonstrated and as many as 3 g of high quality CdSe/ZnS nanocrystals were easily synthesized with the use of only low-cost, green, and environmentally friendlier reagents.read more
Citations
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Journal ArticleDOI
High-efficiency light-emitting devices based on quantum dots with tailored nanostructures
Yang Yixing,Ying Zheng,Cao Weiran,Alexandre Titov,Jake Hyvonen,Jesse R. Manders,Jiangeng Xue,Paul H. Holloway,Lei Qian +8 more
TL;DR: In this paper, a red, green and blue quantum-dot LEDs are realized by customizing the nanostructure of the quantum dots. But their performance was not as good as those of traditional LEDs.
Journal ArticleDOI
Visible quantum dot light-emitting diodes with simultaneous high brightness and efficiency
Huaibin Shen,Qiang Gao,Qiang Gao,Yanbin Zhang,Yue Lin,Qingli Lin,Zhaohan Li,Ling Chen,Zaiping Zeng,Xiaoguang Li,Yu Jia,Yu Jia,Shujie Wang,Zuliang Du,Lin Song Li,Zhenyu Zhang +15 more
TL;DR: In this paper, the authors report red, green and blue quantum dot light-emitting diodes based on CdSe/ZnSe core/shell structures that combine efficient operation with high brightness.
Journal ArticleDOI
Synthesis of Semiconductor Nanocrystals, Focusing on Nontoxic and Earth-Abundant Materials.
Peter Reiss,Peter Reiss,Marie Carrière,Christophe Lincheneau,Christophe Lincheneau,Louis Vaure,Louis Vaure,Sudarsan Tamang +7 more
TL;DR: This work reviews the synthesis of semiconductor nanocrystals/colloidal quantum dots in organic solvents with special emphasis on earth-abundant and toxic heavy metal free compounds and a comprehensive overview on toxicity studies concerning all types of quantum dots.
Journal ArticleDOI
Synthesis and applications of metal-organic framework–quantum dot (QD@MOF) composites
TL;DR: The combination of the high surface areas, microporosity and tuneable compositions of metal-organic frameworks (MOFs) with the desirable photo-physical behaviour of semiconductor nanoparticles or quantum dots (QDs), allows the preparation of composite materials with enhanced properties for applications in photocatalysis, energy, gas storage and sensing as mentioned in this paper.
Journal ArticleDOI
Strategies for interfacing inorganic nanocrystals with biological systems based on polymer-coating
TL;DR: A critical evaluation of the recent developments in the design, optimization and use of various amphiphilic copolymers to surface functionalize the above nanocrystals, along with the strategies used to conjugate them to target biomolecules.
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.
Journal ArticleDOI
Experimental Determination of the Extinction Coefficient of CdTe, CdSe, and CdS Nanocrystals
TL;DR: In this article, the extinction coefficient per mole of nanocrystals at the first exitonic absorption peak, e.g., for high-quality CdTe, CdSe, and CdS, was found to be strongly dependent on the size of the nanocrystal, between a square and a cubic dependence.
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
TL;DR: 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.
Journal ArticleDOI
Electronic wave functions in semiconductor clusters: experiment and theory
Journal ArticleDOI
Formation of high-quality CdTe, CdSe, and CdS nanocrystals using CdO as precursor.
Peng Za,Xiaogang Peng +1 more
TL;DR: This paper proves that Cd(CH3)2 can be replaced by CdO and develops a one-pot synthesis which does not require separated preparation of cadmium complex and is reproducible and simple and thus can be readily scaled up for industrial production.