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
Nanoparticles for biomedical imaging
Satish K. Nune,Padmaja Gunda,Praveen K. Thallapally,Ying-Ying Lin,M. Laird Forrest,Cory Berkland +5 more
TL;DR: This review summarizes recent technological advances in the synthesis of various nanoparticle probes, and surveys methods to improve the targeting of nanoparticles for their application in biomedical imaging with increased selectivity and reduced nonspecific uptake.
Patent
Nanocrystal doped matrixes
J. Wallace Parce,Paul Bernatis,Robert S. Dubrow,William P. Freeman,Joel Gamoras,Shihai Kan,Andreas Meisel,Baixin Qian,Jeffery A. Whiteford,Jonathan Ziebarth +9 more
TL;DR: In this paper, the authors provide matrixes doped with semiconductor nanocrystals, which can be used as filters and antireflective coatings on optical devices and as down-converting layers.
Journal ArticleDOI
From Cd-rich to se-rich--the manipulation of CdSe nanocrystal surface stoichiometry.
Jacek J. Jasieniak,Paul Mulvaney +1 more
TL;DR: This work reports a protocol for manipulating the surface composition of CdSe nanocrystals and demonstrates ligand binding to specific surface sites by combining the successive ion layer adhesion and reaction (SILAR) method and a phosphine-free selenium precursor.
Journal ArticleDOI
Highly luminescent InP/GaP/ZnS nanocrystals and their application to white light-emitting diodes.
Sungwoo Kim,Taehoon Kim,Meejae Kang,Seong Kwon Kwak,Tae Wook Yoo,Lee Soon Park,Ilseung Yang,Sunjin Hwang,Jung Eun Lee,Seong Keun Kim,Sang-Wook Kim +10 more
TL;DR: Highly stable and luminescent InP/GaP/ZnS QDs with a maximum quantum yield of 85% were synthesized by in situ method and TCSPC data showed an evidence for the GaP shell.
Journal ArticleDOI
Liquid-Phase Synthesis of Colloids and Redispersible Powders of Strongly Luminescing LaPO4:Ce,Tb Nanocrystals
TL;DR: Gram amounts of nontoxic, chemically stable LaPO4 :Ce,Tb nanocrystals have been obtained in a coordinating solvent to give scatter-free colloids that exhibit quantum yields of up to 61 %.
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.