1098results about How to "High quantum yield" patented technology

The present invention provides new compositions containing naearly monodisperse colloidal core / shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core / shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.

The present invention relates to a light-emitting device including a light source, a first light-emitting material spaced apart from the light source, and at least one additional light-emitting material. The first light-emitting material includes low reabsorbing semiconductor nanocrystals having an emission-center core, an exterior protective shell, and at least one inner light-absorbing shell. The device is useful for efficiently producing white light having a high color rendering index.

A method of manufacturing a dye-sensitized photoelectric conversion device is provided by which a dye-sensitized photoelectric conversion device being excellent in strength and durability and free of any projection, as a result of the absence of need for an end seal, can be fabricated through simple manufacturing steps. In manufacturing a dye-sensitized photoelectric conversion device which has an electrolyte between a dye-sensitized semiconductor layer and a counter electrode and which also has a first armor member provided on the outside of the dye-sensitized semiconductor layer and a second armor member provided on the outside of the counter electrode, a sealing material and the electrolyte are formed at predetermined locations of one or both of the first armor member and the second armor member, thereafter the first armor member and the second armor member, with the sealing material and the electrolyte sandwiched therebetween, are adhered to each other with the sealing material under a gas pressure of not higher than the atmospheric air pressure and not lower than the vapor pressure of the electrolyte.

The present invention relates to a process for the preparation of doped organic semiconductor materials having an increased charge carrier density and effective charge carrier mobility, by doping with a dopant, a process in which after mixing the dopant into the organic semiconductor material, hydrogen, carbon monoxide, nitrogen or hydroxyl radicals are split off and at least one electron is transferred to the semiconductor material or from the semiconductor material. The process is distinguished by the fact that an uncharged organic compound is used as dopant. Doped organic semiconductor materials are obtainable by one of the processes. The semiconductor materials are distinguished by the fact that the doped layer contains cations of at least one organic compound, the uncharged form of the organic compound being unstable in air.

Optoelectronic devices and methods for their fabrication having enhanced and controllable rates of the radiative relaxation of triplet light emitters are provided exemplified by organic light emitting devices based on phosphorescent materials with enhanced emission properties. Acceleration of the radiative processes is achieved by the interaction of the light emitting species with surface plasmon resonances in the vicinity of metal surfaces. Non-radiative Förster-type processes are efficiently suppressed by introducing a transparent dielectric or molecular layer between the metal surface and the chromophore. For materials with low emission oscillator strengths (such as triplet emitters), the optimal separation distance from the metal surface is determined, thus suppressing energy transfer and achieving a significant acceleration of the emission rate.

Highly luminescent nanostructures, particularly highly luminescent quantum dots, are provided. The nanostructures have high photoluminescence quantum yields and in certain embodiments emit light at particular wavelengths and have a narrow size distribution. The nanostructures can comprise ligands, including C5-C8 carboxylic acid ligands employed during shell formation and / or dicarboxylic or polycarboxylic acid ligands provided after synthesis. Processes for producing such highly luminescent nanostructures are also provided, including methods for enriching nanostructure cores with indium and techniques for shell synthesis.

The invention provides a preparation method for a fluorescence carbon-based quantum dot. The preparation method for the fluorescence carbon-based quantum dot at least comprises the steps of providing oxidized carbon-based quantum dot powder; providing a solvent, and dispersing the oxidized carbon-based quantum dot powder into the solvent to obtain the oxidized carbon-based quantum dot solution; adding a doping agent into the oxidized carbon-based quantum dot solution, reducing the oxidized carbon-based quantum dot by utilizing the solvent thermal reaction so as to obtain the doped carbon-based quantum dot. According to the invention, the technical scheme that oxidized carbon-based quantum dot is taken as a raw material and the solvent thermal reduction and doping are synchronously carried out is adopted, the carbon-based quantum dot represented by graphene quantum dot and carbon quantum dot can be reduced and doped by adopting various easily available nonmetal compounds or metal compounds through the solvent thermal reaction, the yield of a product is high, the regulation on the fluorescent spectrum of the carbon-based quantum dot can be realized, and the yield of quantum can be improved.

The present invention provides a core / multishell semiconductor nanocrystal comprising a core and multiple shells, which exhibits a type-I band offset and high photoluminescence quantum yield providing bright tunable emission covering the visible range from about 400 nm to NIR over 1600 nm.

The invention discloses a nitrogen doped carbon quantum dot as well as a preparation method and an application thereof, belonging to the technical field of material science. The preparation method comprises the steps: after mixing organic acid and organic amine, directly performing a hydrothermal reaction to prepare a nitrogen doped carbon quantum dot water dispersion solution, and extracting and drying the nitrogen doped carbon quantum dot water dispersion solution to obtain a nitrogen doped carbon quantum dot solid. The size of the nitrogen doped carbon quantum dot is not more than 10 nm, the nitrogen content is not more than 50 percent, the surface of the nitrogen doped carbon quantum dot contains amino, carboxyl and hydroxyl; and the quantum efficiency is 39.8-50 percent. The preparation method is simple to operate, environment-friendly, low in equipment requirement; and the prepared nitrogen doped carbon quantum dot has excellent light emitting property, and can be widely applied to fields such as photoelectric materials, biological imaging and fluorescence probe.

The present invention provides a novel class of fluorescent cyanine dye compounds that are modified at one of the hetercyclic ring nitrogen atoms with a mobility-modifying moiety that permits the electrophoretic mobilities of polynucleotides labeled with the mobility-modifying cyanine dyes to be adjusted or tuned in a predictable fashion while retaining enzymatic activity. The ability to predictably tune the relative electrophoretic mobilities of the dyes permits the creation of sets of mobility-matched fluorescent dyes of a variety of structures for a variety of applications, including fluorescence-based 4-color nucleic acid sequencing reactions.

A time-resolved, fluorescence spectrometer makes use of a RadiaLight® optical switch and no dispersive optical elements (DOE) like gratings. The structure is unique in its compactness and simplicity of operation. In one embodiment, the spectrometer makes use of only one photo-detector and an efficient linear regression algorithm. The structure offers a time resolution, for multiple species measurements, of less than 1 s. The structure can also be used to perform fluorescence correlation spectroscopy and fluorescence cross-correlation spectroscopy.

The invention provides a novel class of reactive fluorescent agents that are based on a pyrene sulfonic acid nucleus. The agents are readily incorporated into conjugates with other species by reacting the reactive group with a group of complementary reactivity on the other species of the conjugate. Also provided are methods of using the compounds of the invention to detect and / or quantify an analyte in a sample. In an exemplary embodiment, the invention provides multi-color assays incorporating the compounds of the invention.

The present invention provides luminescent lanthanide metal chelates comprising a metal ion of the lanthanide series and a complexing agent comprising at least one salicylamidyl moiety. Also provided are probes incorporating the salicylamidyl ligands of the invention and methods utilizing the ligands of the invention and probes comprising the ligands of the invention.

Highly fluorescent carbon nanoparticles (FCNs), with tunable emission colours of particle size between 1-10 nm also stable in solid form with high quantum yield (>5%) and its method of synthesis thereof yielding said carbon nanoparticles in milligram to gram scale in high synthesis yield (>80%). The present invention also provides for highly fluorescent carbon nanoparticle solution doped with heteroatom (such as oxygen, nitrogen) and its method of synthesis favoring yield of the said doped carbon nanoparticles of even smaller size ranging from 1-5 nm with narrow size distribution, and also provides for functionalized FCNs that are non-toxic, functional, soluble and stable fluorescent carbon nanoparticles with retained fluorescence for variety of end uses in biomedics, imaging applications, and detection techniques.

An axially substituted silicon-phthalocyanin match and its composition are disclosed, which have high optical spectrum characteristics and can be used as the photosensitizer used for photodynamic therapy to tumor and the diseases other than cancer, photodynamic diagnosis and photodynamic disinfecting.

A semiconductor nanocrystal composition comprising a Group V to VI semiconductor material and a method of making same. The method includes synthesizing a semiconductor nanocrystal core, where the synthesizing includes dissolving a Group V to VI anion gas in a first solvent to produce a Group V to VI anion precursor, preparing a cation precursor, and reacting the Group V to VI anion precursor with the cation precursor in the presence of a second solvent. The reacting may occur in a high pressure vessel.

The present invention provides luminescent lanthanide metal chelates comprising a metal ion of the lanthanide series and a complexing agent comprising at least one phthalamidyl moiety. Also provided are probes incorporating the phthalamidyl ligands of the invention and methods utilizing the ligands of the invention and probes comprising the ligands of the invention.

The invention provides hollow fluorescent carbon quantum dots as well as a preparation method and application thereof and belongs to the technical field of light-emitting nano materials. The preparation method comprises the following steps: adding ethanediamine and concentrated acid into water soluble saccharides serving as a carbon source, so as to obtain a puce viscous material; after reaction stops, naturally cooling a glass container, adding a certain amount of secondary water, stirring for dissolving to obtain a dark brown solution, and dialyzing to remove impurities, thereby obtaining a hollow carbon quantum dot aqueous solution; and freeze-drying to obtain the hollow carbon quantum dots. The preparation method is simple in process, wide in raw material source, low in price, low in preparation condition requirement, and free from energy consumption; the obtained hollow carbon quantum dots are relatively high in yield, small in particle diameter and uniform in size; the preparation method is capable of realizing batch production; the obtained hollow carbon quantum dots can be used for anticancer drug carriers, are capable of reducing the toxic and side effects of anticancer drugs and also can be used in detection of VI ions in water.

The present invention relates to a method of manipulating the physiological state of algae cultured in raceway ponds by altering one or more environmental parameter to simulate algal bloom forming conditions and to raceway ponds suitable for culturing algae according to the present invention. The alteration of the one or more environmental parameters in a specifically timed manner can be used to induce and maintain synchronous cell division.

The invention relates to neutral mononuclear copper (I) complexes for emitting light and with a structure according to formula (A) in which: M represents: Cu(I); L∩L represents: a single, negatively charged, bidentate ligand; N∩N represents: a diimine ligand (substituted with R and FG), in particular a substituted 2,2′-bipyridine derivative (bpy) or a substituted 1,10-phenanthroline derivative (phen); R represents: at least one sterically demanding substituent for preventing the planarisation of the complex in the excited state; FG=functional group, and represents: at least one second substituent for increasing solubility in organic solvents. The substituent can also be used for electron transport or alternatively for hole transport, said functional group being bound to the diimine ligands either directly or by means of suitable bridges; and the copper (I) complex: having a ΔE(S1−T1) value of less than 2500 cm−1 between the lowest excited singlet state (S1) and the triplet state (T1) which lies below; having an emission lifespan of at most 20 μs; having an emission quantum yield of greater than 40%, and a solubility of at least 1 g / L in organic solvents, in particular polar organic hydrocarbons such as acetone, methyl ethyl ketone, benzene, toluene, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, dichloroethane, tetrachloroethylene, alcohols, acetonitrile or water.

Nanocrystals having an indium-based core and methods for making them and using them to construct core-shell nanocrystals are described. These core-shell nanocrystals are highly stable and provide higher quantum yields than known nanocrystals of similar composition, and they provide special advantages for certain applications because of their small size.

The invention discloses an inclined wide-field optical section scanning imaging microscope system and an imaging method thereof. The inclined wide-field optical section scanning imaging microscope system comprises a laser transmitting device, wherein laser transmitted by the laser transmitting device enters a laser scanning optical path consisting of a two-dimensional scanning galvanometer, a collimator lens group and a first microscope objective to perform inclined scanning on a sample on a sample platform; a second microscope objective, a field lens and a detector form an imaging detection optical path the optical axis of which is perpendicular to the laser scanning optical path; an imaging display control device respectively controls the synchronized action of the two-dimensional scanning galvanometer, the second microscope objective and the detector and the automatic displacement of the sample platform through a data acquisition card and a sample platform control device, and processes acquired imaging data of the detector to form wide field three-dimensional image information of the sample. The imaging microscope system and the imaging method disclosed by the invention have high scanning imaging speed and high resolution and can implement wide field scanning imaging.

The invention discloses a preparation method of a graphite phase carbon nitride / rutile monocrystal titanium dioxide (TiO2) nanowire array. The preparation method is characterized by comprising the following steps: (a) dissolving a cyanamide compound or urea in a solution, immersing the prepared rutile monocrystal TiO2 nanowire array into the obtained cyanamide compound or urea solution, and then taking out and drying the nanowire array; and (b) performing heat treatment on the dried nanowire array to finally obtain the graphite phase carbon nitride / rutile monocrystal TiO2 nanowire array. The preparation method has the advantages of simple process and low cost, thus being applicable to large-scale industrial production; and the prepared graphite phase carbon nitride / rutile monocrystal TiO2 nanowire array has good visible light response activity, and can be widely applied to the fields such as photocatalysis, hydrogen production by photocatalytic decomposition of water, photoelectric conversion and the like.

Apparatus and methods to enhance light intensity within useful red to near-infrared spectral ranges, using direct or indirect sunlight, or from other ambient white light, are described. The disclosed devices provide high quantum yield photoluminescent ambient light spectrum conversion to increase the supplied energy primarily in the 590 nm-850 nm spectral range. These devices also pass much of the incident light in the spectral range in which the device's photoluminescent materials emit light, thereby greatly increasing the effective intensity of light available in the targeted 590-850 nm wavelength range. The ambient light conversion devices of the disclosure may be incorporated in apparel, bandage-like patches, converting reflectors, large area converters, awnings, window covers, and other articles, materials, and products. The converted light may be used in therapeutic treatments, horticultural and biotechnological applications, and other applications in which the converted light outputs of the present disclosure are beneficial.

The invention relates to a signaling lamp with VUV phosphor excitation, in particular for traffic applications. It further relates to the use of phosphor mixtures for red, green and yellow signaling lamps and to a correspondingly constructed traffic light. (FIG. 1).

The invention discloses application of fluorescent silica nanoparticles as an anti-fake mark. The fluorescent silica nanoparticles are prepared from a silicon source, and the obtained fluorescent silica nanoparticles are used for preparing anti-fake patterns by using anti-fake ink. The fluorescent silica nanoparticles are excellent in luminescent property, high in quantum yield and good in storage stability, and have good excitation wavelength dependency; the prepared anti-fake patterns can display light of different colors under the illumination of different laser wavelengths, and can achieve a good anti-fake effect.

The invention belongs to the field of organic electroluminescent material, and in particular relates to polyaryl substituted pyridine derivatives and a synthetic method thereof, as well as application to preparing organic electroluminescent devices by using materials of the polyaryl substituted pyridine derivatives. Through molecular design, the synthetic method introduces large substituting groups which have rigid structures to ensure that the large substituting groups are not easy to form a group excited compound, inhibits the crystallization processes of the large substituting groups, improves the film forming properties of the large substituting groups, and increases charge transfer performances of the large substituting groups; at the same time, destroy of molecular co-planarity makes the large substituting groups emit peak blue shift, so as to achieve the aim of improving the properties of the devices. The polyaryl substituted pyridine derivatives comprise a structural formula as above.

The present invention relates to a method for preparing a CdX (X= Se or Te) quantum dot nano material with high quantum yield in an aqueous phase by using simple operation conditions, and belongs to the field of nano material preparation. The preparation method does not require nitrogen as a protective gas, or a buffer solution, or a particular ligand, or a large amount of hydrazine hydrate as a reducing agent, or a special post-treatment. In the aqueous phase, a thiol compound is used as a ligand; cadmium salt and potassium tellurite (selenite) are selected respectively as a cadmium source and a tellurium (selenium) source; and sodium borohydride is used as a reducing agent. The water-soluble CdTe (CdSe) quantum dot with quantum yield up to 83% can be prepared from a one-pot reaction.

Embodiments of the invention provide a scintillator material, a scintillator system, and / or a method of detecting incident radiation using a scintillator material, or scintillator system, comprising a polymer material that comprises chromophores. Additional embodiments provide a scintillator material, scintillator system, and / or a method of detecting incident radiation using a scintillator material, or scintillator system, comprising a polymer material having one, two, three, or more, organic dyes dissolved therein wherein the polymer material having the one, two, three, or more dyes dissolved therein comprises chromophores. At least one of the dyes, termed the base dye, has a concentration in the range 0.5 to 3.5 mol / L. In a specific embodiment, the base dye has a concentration in the range 1.0 to 3.0 mol / L. This base dye concentration is high enough to achieve a substantial triplet-triplet state annihilation rate despite the negligible diffusion of the dye in the rigid polymer matrix.