A nanocrystal capable of light emission includes a nanoparticle having photoluminescence having quantum yields of greater than 30%.

Highly luminescent color-selective nanocrystalline materials

A semiconductor nanocrystal compound and probe are described. The compound is capable of linking to one or more affinity molecules. The compound comprises (1) one or more semiconductor nanocrystals capable of, in response to exposure to a first energy, providing a second energy, and (2) one or more linking agents, having a first portion linked to the one or more semiconductor nanocrystals and a second portion capable of linking to one or more affinity molecules. One or more semiconductor nanocrystal compounds are linked to one or more affinity molecules to form a semiconductor nanocrystal probe capable of bonding with one or more detectable substances in a material being analyzed, and capable of, in response to exposure to a first energy, providing a second energy. Also described are processes for respectively: making the semiconductor nanocrystal compound; making the semiconductor nanocrystal probe; and treating materials with the probe.

Semiconductor nanocrystal probes for biological applications and process for making and using such probes

A light emitting device includes a semiconductor nanocrystal and a charge transporting layer that includes an inorganic material. The charge transporting layer can be a hole or electron transporting layer. The inorganic material can be an inorganic semiconductor.

Light emitting device including semiconductor nanocrystals

A microparticle can include a central region and a peripheral region. The peripheral region can include a nanoparticle, such as a metal nanoparticle, a metal oxide nanoparticle, or a semiconductor nanocrystal. The microparticle can be a member of a monodisperse population of particles.

Microspheres including nanoparticles

The invention relates to a method for producing fluorescent inorganic nanoparticles, whereby the nanoparticles are comprised of a host material containing at least one dopant. The inventive synthesis involving the use of organic solvents results in a significantly better yield than that achieved in prior art water synthesis. Articles of all types can be advantageously marked and, by using automated methods, can be reliably authenticated based on a characteristic emission. In addition, the size distribution of the produced nanoparticles is tighter thus rendering a subsequent separation according to size unnecessary.

Synthesis of nanoparticles

A manufacturing method for a nanocrystal light emission substance having a nano structure crystal, doped with an activator and cured with ultraviolet light. The nanocrystal light emission substance is synthesized by a liquid phase co-precipitation process. During the liquid phase reaction, an organic acid, such as acrylic acid or methacrylic acid, is added. Alternatively, a high molecular organic acid, such as polyacrylic or polymethacrylic acid, polystyrene, is added after the liquid phase reaction. The resulting substance is then cured with ultraviolet light.

Method for producing light-emitting substance

An organic acid salt is deposited on the surface of a solder powder containing Sn and Zn. Alternatively, 0.5 to 10 wt.% of a nonionic surfactant is added to a flux. By a method comprising such a procedure, provided are a lead-free solder powder and solder paste having good soldering characteristics wherein the reaction of an activating component with an alloy component in a flux is suppressed.

Solder powder and method for preparing the same and solder paste

PROBLEM TO BE SOLVED: To produce a nanocrystal phosphor having a nanostructure crystal, doped well with an activator, and having a high luminous efficiency. SOLUTION: A nanocrystal phosphor activated with an activator and having a mean particle diameter of 2-5 nm is irradiated with ultraviolet rays. The nanocrystal phosphor is synthesized by a liquid-phase reaction utilizing coprecipitation. For example, a manganese-doped zinc sulfide nanocrystal phosphor is synthesized by reacting manganese acetate with zinc acetate together with sodium sulfide in a solvent. In carrying out the liquid phase reaction, an organic acid such as acrylic acid or methacrylic acid is added. Alternatively, after the liquid-phase reaction, a polymeric organic acid such as polyacrylic acid or polymethacrylic acid or a polystyrene is added. COPYRIGHT: (C)2000,JPO

Production of luminescent material

PROBLEM TO BE SOLVED: To provide a method for producing a luminophor having a nano- structure and excitable in a low voltage range by forming a semiconductor of the group II to VI doped with an activator by a coprecipitation-aided liquid- phase reaction process with an organic acid incorporated in the reaction system. SOLUTION: This luminophor is obtained by a coprecipitation-aided liquid- phase reaction process with an organic acid (preferably acrylic or methacrylic acid) incorporated in the reaction system, to form a semiconductor of the group II to VI (preferably zinc sulfide) doped with an activator (preferably manganese). When, for example, zinc sulfide as the semiconductor doped with manganese as the activator is to be formed, the liquid-phase reaction process reacts manganese acetate and zinc acetate with sodium sulfide in a solvent. This process polymerizes the incorporated organic acid into a polymer, which is chemically bound to the semiconductor to provide part of the energy required for emitting light. COPYRIGHT: (C)1998,JPO

Production of luminophor

PROBLEM TO BE SOLVED: To provide a lead free solder powder and a solder paste excellent in practical use, wherein even the solder contains high reactive Zn together with Sn, but the solderability is good and the reaction between the active component and the alloy component in the blux is restrained. SOLUTION: Organic acid salt such as stearic copper etc., is stuck to the surface of the solder powder containing Sn, Zn, further Bi, etc., further, in the flux, nonionic surface active agent is added at 0.5-10 wt.%. The organic acid salt can be produced by blasting solution saturated with the organic acid salt to the solder powder continuously dropped or by dipping the solder powder into his solution. The solubility of the organic acid salt in the saturated solution dipped with the solder powder is gradually lowered by dripping alcohol etc., to form the thin film of the organic acid salt coated on the surface of the soldering powder.

Tetsuhiko Isobe

Papers

Method for producing light-emitting substance

Solder powder and method for preparing the same and solder paste

Production of luminescent material

Production of luminophor

Solder powder and manufacture thereof, and solder paste