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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Sequential Growth of Magic-Size CdSe Nanocrystals†
Stefan Kudera,Stefan Kudera,Marco Zanella,Cinzia Giannini,Aurora Rizzo,Yanqin Li,Giuseppe Gigli,Roberto Cingolani,Giuseppe Ciccarella,W. Spahl,Wolfgang J. Parak,Liberato Manna +11 more
Journal ArticleDOI
Size vs surface: tuning the photoluminescence of freestanding silicon nanocrystals across the visible spectrum via surface groups.
TL;DR: Through rational variation in the surface moieties it is demonstrated that the photoluminescence of Si-NCs can be effectively tuned across the entire visible spectral region without changing particle size.
Journal ArticleDOI
Kinetics of metal-affinity driven self-assembly between proteins or peptides and CdSe-ZnS quantum dots
Kim E. Sapsford,Thomas Pons,Igor L. Medintz,Seiichiro Higashiya,Florence M. Brunel,and Philip E. Dawson,Hedi Mattoussi +6 more
TL;DR: A molecular characterization of metal-affinity driven self-assembly between CdSe−ZnS core−shell quantum dots (QDs) and a series of proteins and peptides appended with various length polyhistidine tags finds that self- assembly is rapid.
Journal ArticleDOI
Chemistry of InP Nanocrystal Syntheses
Sudarsan Tamang,Christophe Lincheneau,Christophe Lincheneau,Yannick Hermans,Yannick Hermans,Sohee Jeong,Peter Reiss,Peter Reiss +7 more
TL;DR: In this article, a number of challenges remain to be addressed in order to progress from isolated research results to robust and reproducible synthesis methods for high quality InP nanocrystals.
Journal ArticleDOI
Color‐Saturated Green‐Emitting QD‐LEDs
Jonathan S. Steckel,Preston T. Snee,Seth Coe-Sullivan,John P. Zimmer,Jonathan E. Halpert,Polina Anikeeva,Lee Ann Kim,Vladimir Bulovic,Moungi G. Bawendi +8 more
TL;DR: Although efficient green-emitting core–shell semiconductor NCs that emit at l= 525 nm have been synthesized, they have not been successfully incorporated into a QD-LED suitable for display applications, and herein, the synthesis of a (CdSe)ZnS core-shell material is reported.
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.