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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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
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Photoluminescence Brightening via Electrochemical Trap Passivation in ZnSe and Mn2+-Doped ZnSe Quantum Dots
TL;DR: Analysis indicates that the electrobrightening magnitude is determined by competition between electron trapping and photoluminescence or energy transfer dynamics within the excitonic excited state, and that electron trapping is extremely fast.
Journal ArticleDOI
Characteristics of nanocrystalline CdSe films
TL;DR: In this article, a 10min deposition of nanocrystalline films was carried out at 100°C for 10min with precursors of CdSO4, SeO2 and H2SO4.
Journal ArticleDOI
Dual-color emitting quantum-dot-quantum-well CdSe-ZnS heteronanocrystals hybridized on InGaN∕GaN light emitting diodes for high-quality white light generation
Sedat Nizamoglu,Evren Mutlugun,Tuncay Ozel,Hilmi Volkan Demir,Sameer Sapra,Nikolai Gaponik,Alexander Eychmüller +6 more
TL;DR: In this article, the photometric properties of tristimulus coordinates (x,y)=(0.36,0.30), luminous efficacy of optical radiation LE=278lm∕W, correlated color temperature CCT=3929K, and color rendering index CRI=75.1.
Journal ArticleDOI
Single Nonblinking CdTe Quantum Dots Synthesized in Aqueous Thiopropionic Acid
Journal ArticleDOI
Ultrasonic wave characteristics of nanorods via nonlocal strain gradient models
TL;DR: In this article, a non-local strain gradient model was introduced to analyze the ultrasonic wave dispersion characteristics of a nanorod, where wave numbers and wave speeds were derived for wave number and the wave speeds.
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.