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Colloidal semiconductor nanocrystals exhibit physical properties that are characteristic of intermediate size scales between molecular states and solid state materials, and are often called quantum dots. Solid state semiconductor materials have been used extensively as scintillation detectors for ionizing radiation. We describe the use of semiconductor quantum dot - organic polymer composites for...
We have synthesized a series of mercapto compounds containing polyethylene glycol (PEG) group for water solubility and bio-compatibility. Those mercapto compounds were used to prepare fluorescent supramolecular assemblies which contain CdSe nanoparticles as the fluorescent moiety and those mercapto compounds as the modifier. Besides PEG group, many other functional groups were also designed in the...
This paper presents a novel direct fluorescent ion detection system based on optically active inorganic CdSe quantum dots, surface-functionalized with an organic ionophore, a calixcrown. This new nanoassembly was accomplished via a thiol-based capping strategy. The detection of metal ions upon interaction with the calixcrown relied on changes in quantum dots fluorescence.
The two-photon excited fluorescence from CdSe/ZnS quantum dots on the surface of a two-dimensional SiN photonic crystal was investigated. With photonic crystal, the enhancement and the blue shift of two-photon excited fluorescence was observed.
Summary form only given. One-dimensional nanostructures are desirable in modern technology for their potential applications as the smallest possible carriers for electrons or plasmonic signals. The ability to direct the signal from source to destination could have major implications in the fields of nanoelectronics and photonics. However, one of the major challenges facing the application of these...
This paper describes the modification of individual CdSe-CdS nanocrystals emission deposited at a controlled distance d from a gold semicontinous film. These colloidal quantum dots exhibit many promising optical properties and can be easily manipulated. Emission wavelength can be tuned between 450 and 600 nm through the control of the nanocrystals synthesis parameters. Finally, the results reveal...
A single-photon source based on single CdSe quantum-dot fluorescence in a chiral-photonic- bandgap liquid-crystal host manifests itself in observed fluorescence antibunching. Chiral-photonic- bandgap structures will provide deterministically handed, circular-polarized fluorescence, even for emitters without a dipole moment.
A new platform for fluorescence enhancement incorporating photonic crystal slabs is demonstrated. Fluorescence enhancement occurs by the effect of leaky eigenmodes that serve to enhance near-field intensities and simultaneously provide enhanced extraction.
Good quality quantum dots (QDs) CdSe were prepared with a novel and non-TOP method. Quantum dots with different sizes ranging from 2 to 5 nm could be obtained by removing aliquots of reaction solution at different time intervals. The quantum dots CdSe (core) -silica (shell) was fabricated by a microemulsion method. Transmission electron microscopy (TEM) images confirmed the well monodispersed QDs...
CdSe QDs in sol-gel films are promising for nonlinear optical waveguide devices. We measured the two-photon absorption (TPA) coefficient at 820 nm in such films, and TPA-induced fluorescence over the 730-980 nm wavelength range.
We obtained very bright light emission from CdSe quantum dots (QDs) by using surface plasmon coupling. Both the photoluminescence intensities and decay rates are dramatically increased when QDs are located on evaporated gold films.
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