353results about How to "High fluorescence efficiency" patented technology

The present invention provides for functionalized fluorescent nanocrystal compositions and methods for making these compositions. The compositions are fluorescent nanocrystals coated with at least one material. The coating material has chemical compounds or ligands with functional groups or moieties with conjugated electrons and moieties for imparting solubility to coated fluorescent nanocrystals in aqueous solutions. The coating material provides for functionalized fluorescent nanocrystal compositions which are water soluble, chemically stable, and emit light with a high quantum yield and / or luminescence efficiency when excited with light. The coating material may also have chemical compounds or ligands with moieties for bonding to target molecules and cells as well as moieties for cross-linking the coating. In the presence of reagents suitable for reacting to form capping layers, the compounds in the coating may form a capping layer on the fluorescent nanocrystal with the coating compounds operably bonded to the capping layer.

The present invention provides for detection apparatus with functionalized fluorescent nanocrystal compositions and methods for making and using these compositions in biological detection applications, material separations, and in the production of biosensors. The compositions are fluorescent nanocrystals coated with at least one coating material comprising ligands with functional groups or moieties with conjugated electrons and moieties for imparting solubility to fluorescent nanocrystals in aqueous solutions. The coating material provides for functionalized fluorescent nanocrystal compositions which are water soluble, chemically stable, and emit light with a high quantum yield and / or luminescence efficiency when excited with light. The coating material may also have chemical compounds or ligands with moieties for bonding to target molecules and cells as well as moieties for cross-linking the coating.

Disclosed are a novel organic electroluminescent compound and an organic electroluminescent device including the same. When included in a hole injection layer or a hole transport layer of an organic electroluminescent device, the disclosed organic electroluminescent compound can improve luminous efficiency while lowering driving voltage of the device.

The invention provides a preparation method of perovskite quantum dots. The preparation method comprises steps as follows: A), Cs2CO3, oleic acid and octadecene are mixed and subjected to a heating reaction under the condition of protective atmosphere, and a cesium oleate precursor solution is obtained; B), lead halide and octadecene are mixed and subjected to heating and heat preservation under the condition of protective atmosphere, after an oleic acid and oleylamine mixed solution is added and heated to 170-190 DEG C, an obtained mixed solution is mixed and reacts with the cesium oleate precursor solution, and the perovskite quantum dots are obtained, wherein the lead halide is selected from one or more of lead chloride, lead bromide and lead iodide. According to the preparation method, the coordination effect of surface ligands of the perovskite quantum dots of different halide ions directly synthesized at a higher temperature is more remarkable, so that stability and fluorescence quantum efficiency of the synthesized perovskite quantum dots are both guaranteed.

The invention discloses a method for preparing a biocompatible aqueous quantum dot. The method comprises the following steps: a high-quality quantum dot and a nucleocapsid structure thereof are prepared; a surface modification technology is combined; the nucleocapsid structure is utilized to improve the stability of the quantum dot; through mutual action of intermolecular force, an organic molecular chain on the surface of the quantum dot is changed; an organic molecule of a long chain on the surface of an oil-phase quantum dot is changed into a small molecule which contains sulfhydryl and carboxyl or amidocyanogen and has biocompatibility and is water-soluble or a derivative of a large biological molecule; and finally, the biocompatible aqueous quantum dot which can be directly dissolved in phosphate buffer and the like is obtained. The method has the advantages: the preparation and surface modification method of the quantum dot are simple and easy to control the quality, the dimension and the surface property of the quantum dot; the obtained aqueous quantum dot has the advantages of higher fluorescent efficiency, even distribution of particle diameter, strong stability and the like; and the aqueous quantum dot prepared by the method can be used for biological detection, medical diagnosis, energy transferring and the like.

The invention discloses the preparation method of low cost cadmium selenide (CdSe) / cadmium sulphide (CdS) / zinc sulphide (ZnS) quantum point. The invention is characterized in that ethide xanthic acid cadmium and ethide xanthic acid zinc are adopted to be respectively dissolved in the mixed solvent of oleic amine and oleic acid, as well as cadmium stearate and zinc stearate; as the front dirking liquid of clads CdS and ZnS of a SdSe quantum point, the invention is slowly dropped into the mixed liquor of octadecene and octadecylamine dissolved with CdSe quantum point, so as to obtain CdSe / CdS / ZnS quantum points. The invention has the advantages that the price of the raw material is cheap, the toxicity is low, the operation is simple, and the mass synthesis is proper.

The invention discloses a halogen passivated perovskite quantum dot, a preparation method thereof and a QLED device, wherein, the preparation method comprises the following steps: adding a ligand withdeprotonation effect into an inorganic perovskite quantum dot solution, carrying out ligand exchange reaction to obtain an inorganic perovskite quantum dot solution after the first ligand exchange; Then, the polar organic halide is added into the inorganic perovskite quantum dot solution after the first ligand exchange to perform halogen passivation on the surface of the inorganic perovskite quantum dot, and the halogen passivated inorganic perovskite quantum dot is obtained by centrifugation. The invention can effectively passivate the metal and non-metal elements on the surface of the inorganic perovskite quantum dot, reduce the surface defects of the inorganic perovskite quantum dot, thereby improving the fluorescence intensity and the charge transmission efficiency of the inorganic perovskite quantum dot.

The invention discloses a composite hole transport layer with a multi-layer periodic doping structure, an LED device structure and application and preparation method of the LED device structure. By doping a metal oxide material in a hole organic transport layer of a quantum-dot light emitting device, the hole transport layer (HTL) taking the doping organic layer as a structural unit and with multi-layer periodic doping is fabricated, the hole injection capability of the device is remarkably improved, so that the carrier injection balance in the device is improved. Meanwhile, the influence of the doping proportion of the metal oxide doping material in the HTL on the light emitting property of the device is symmetrically researched. The structure is not limited to a quantum-dot LED, and the device structure can be implanted to other types of photoelectric devices.

The invention discloses a uniform fluorescent microball and a preparation method. The preparation method includes the following steps: (1) preparing porous polymer microballs with uniform particle diameter and hole diameter in advance; (2) compounding quantum dots in the polymer microballs prepared in the step (1) so as to obtain quantum-dot polymer composite microballs; and (3) dispersing the quantum-dot polymer composite microballs prepared in the step (2) into ethanol / water mixed solution and adding ethyl silicate to prepare the fluorescent microball with the surface covered by silicon dioxide. The particle diameter of the fluorescent microball prepared by the above preparation method ranges from 500nm to 100 mu m and is uniform and controllable, and the fluorescent microball is high in fluorescent efficiency and stable in chemical property and has potential application value in the bioinstrumentation and medical fields.

The present invention relates to a loaded latex particle comprising a latex material made from a mixture represented by formula (X)m-(Y)n-(Z)o-(W)p, wherein Y is at least one monomer with at least two ethylenically unsaturated chemical functionalities; Z is at least one polyethylene glycol macromonomer with an average molecular weight of between 300 and 10,000; W is an ethylenic monomer different from X, Y, or Z; and X is at least one water insoluble, alkoxethyl containing monomer; and m, n, o, and p are the respective weight percentages of each monomer. The particle may be loaded with a fluorescent dye.

The invention provides nano fluorescent particles doping with rare-earth ions. The grain size of the nano particles is 1-200nm, and the nano particles comprise a nano particle matrix and rare-earth ions. The invention also provides a solar battery containing the nano particles.

The invention belongs to the technical field of preparation of rare earth europium organic coordination compound and macromolecular polystyrene composite fibers by electrostatic spinning and relates to a method for preparing rare earth fluorescence micro / nano fibers, which comprises: placing europium oxide in an excessive amount of diluted hydrochloric acid to react the europium oxide with the excessive amount of diluted hydrochloric acid completely, allowing the excessive hydrochloric acid to volatilize to obtain europium chloride, reacting the europium chloride, acetylsalicylic acid and phenanthroline, which are in a mass ratio of 1:2.1:0.78, in ethanol in the presence of triethylamine serving as a complexing agent and catalyst, adjusting the pH value to make the chloride, acetylsalicylic acid and phenanthroline react completely, washing, filtering under vacuum and drying to obtain white powdery rare earth coordination compound; and dissolving the rare earth europium coordination compound and a macromolecular material in solution of tetrahydrofuran or trichloromethane respectively, mixing, and uniformly stirring to obtain solution of precursor, and performing electrostatic spinning to obtain micro / nano fibers having smooth appearance and strip structures. In the invention, the preparation process is simple, and the product has low cost, good fluorescence effect and high performance and can be widely used in fields of electrical, optical and chemical materials and the like.

The invention provides a method for synthesizing ZnxCd1-xSe (x is more than or equal to 0 and less than or equal to 1) and ZnxCd1-xSe / ZnSe, ZnxCd1-xSe / ZnS and ZnxCd1-xSe core / shell structured semiconductor nanocrystals thereof by using long-chain fatty acid salts of cadmium and zinc as precursors of cadmium and zinc, which is the most economical and environment-friendly method for synthesizing high-quality ZnxCd1-xSe and related core / shell structured semiconductor nanocrystals thereof currently. The method avoids using tributylphosphine (TBP) or trioctylphosphine (TOP) dissolved elementary selenium as the precursor of selenium currently in the world, but adopts octadecylene (ODE) dissolved elementary selenium as the precursor of selenium; and the obtained nanocrystals have the quality equal to that of nanocrystals which are synthesized when the TBP or TOP dissolved selenium powder is used as the precursor of selenium. The method is called a phosphine-free method, has the advantages of simple synthesizing process, good repeatability, safety, environmental protection, no need of glove box, and cost conservation of over 60 percent. The synthesized ZnxCd1-xSe and related core / shell structured nanocrystals have a fluorescence range of between 400 and 650nm, and have the advantages of uniform particle size distribution, high efficiency of fluorescent quantum yield (40 to 70 percent) and narrow full width at half maximum. The method is also suitable for synthesizing the ZnxCd1-xS, HgxCd1-xSe, ZnxCd1-xTe nanocrystals and related core / shell structures thereof. More importantly, the method can synthesize high-quality nanocrsytals on a large scale, and has enormous application value both in laboratory synthesis and industrial synthesis.

The invention provides a doped semiconductor nanocrystalline quantum dot having a core-shell structure and a preparation method thereof. The quantum dot comprises a nanocrystalline core doped with Mn and a shell layer; the composition of the nanocrystalline core is MnzZn[1-z]SexS[1-x], and the composition of the shell layer is ZnSeyS[1-y], wherein x is greater than 0 or less than or equal to 1, y is greater than or equal to 0 and less than 1 and z is greater than 0 or less than or equal to 0.5; the dimension of the nanocrystalline core is 2-15 nm, and the dimension of the shell layer is 2-15 nm; the emission wavelength of the nanocrystalline quantum dot ranges from 590 to 630 nm. The fluorescence emission wavelength of the quantum dots is continuously adjustable in the range from 590 to 630 nm; as a result, the quantum dots cover the shortage of non-cadmium-doped nanocrystalline in emission wavelength, and have high fluorescence and quantum efficiency, as well as good air, temperature and optical stability; the quantum dots are good in absorption in blue and purple zones and have no self-absorption within other visible light wavelengths; the quantum dots contain no toxic metal and can be widely applied to the fields such as solid-stable lighting, solar cell, biological-medical detection and the like.

The invention relates to a preparation method for a core-shell structure nanocrystal, wherein a nanocrystal in the shape of a spot particle containing selenium compound is dissolved in a solvent added with an additive, then the oxygen contained in the solution is eliminated in an environment of inertia gas to obtain a solution 1, then sulfur and the precursor of 12th group of elements are respectively dissolved in solutions with the same solvent and mixed so as to obtain a solution 2, which is dripped into the solution 1, then the mixed solution is heated up to 120-280 DEG C to make the nanocrystal to grow, so as to obtain the core-shell structure nanocrystal with the nanocrystal containing the selenium compound as the core and with the sulfide as the shell; the additive is an organic amine or an organic acid, each of which contains the carbons not less than 10; and the solvent is a non-coordinate solvent with the boiling point no higher than 60 DEG C; and the molecular ratio between the sulfur and the 12th group of elements is 1:1-1.5. The invention is characterized in simplified procedures, easy operation, environment-friendly solvent, low cost which can be saved by more than 50percent, and great application value on both laboratorial and industrial synthesis.

The invention relates to a zero-dimensional lead-free caesium copper iodine perovskite blue nanocrystal and a preparation method thereof, and belongs to the technical field of photoelectron material preparation. The preparation method of the nanocrystal comprises the steps that cesium iodide and cuprous iodide are dissolved in N,N-dimethylformamide or dimethyl sulfoxide to obtain a precursor solution, then the precursor solution is injected into an organic solution, a stirring reaction is performed for 3-6 minutes at a speed of 5000-9000 rpm, then centrifugation is preformed, a precipitate istaken and washed, and the nanocrystal is obtained. The nanocrystal not only has a good crystal structure, high yield, high fluorescence efficiency and a stable structure, but also contains no heavy metal lead, reduces the harm to the human body and the environment, and has wide application prospects in photovoltaic devices. The preparation method of the nanocrystal is simple and easy to implement,has low cost and can be popularized in the industrial production.

The invention relates to a water soluble NaYF4@NaGdF4 nanocrystalline with an upconversion core-shell structure and a preparation method thereof, and belongs to the technical field of microwave polyhydric alcohol chemical method synthesis. The nanocrystalline with the upconversion core-shell structure provided by the invention, is regulatable balls with different sizes in addition amount of an outer polytetrafluorogadolinium sodium shell, and the average diameter is 14-38 nanometers. The physical phase is converted from square phase to hexagonal phase. According to the nanocrystalline with the core-shell structure provided by the invention, polyethyleneimine covers the surface of the polytetrafluorogadolinium sodium nanocrystalline, so that the particles have good water solubility, and the shape of products can be controlled, and the nanocrystalline has good biological compatibility. Along with increase of the shell layer, upconversion luminescence is increased, and the fluorescent lifetime cancellation time is prolonged. The nanocrystalline can be used as an effective CT (Computed Tomography) responder and has potential application value in the fields such as biological imaging. The nanocrystalline with the core-shell structure has higher fluorescence efficiency and better water solubility and biological application value.

The invention relates to a preparation method of selenium-bearing compound nanocrystal, which comprises following steps: heating the precursor of the twelve family elements to 240 to 380 DEG C in inertia environment; mixing with the selenium precursor at 20 to 300 DEG C; enabling the growth of the mixture at 240 to 380 DEG C for 1 to 12 hours to obtain the selenium-bearing compound nanocrystal; wherein, the selenium precursor is obtained by dissolving selenium salt in the solvent with additives; the additives are organic amine or organic acid with the carbon content of no less than 10; the solvent is non-coordinating solvent with the dissolving point of no more than 60 DEG C; the molar ratio of the additives and the selenium is 3 to 5:1. The method has the advantages of regular and stable low toxicity medicine for synthesis, economy, environmental friendliness, capability of saving cost of over 80%, high quality of nanocrystal, even size distribution, high fluorescence efficiency, narrow FWHM (full width at half maximum), and huge application value in both laboratory synthesis and industrial synthesis.

The invention provides a preparation method for synthesizing CdSe / CdS core-shell structure quantum dots through one step. The preparation method comprises the following steps of: mixing cadmium precursor with oleic acid and octadecene, adding oleylamine and trioctylphousphine oxide (TOPO), and heating the solution in argon atmosphere; injecting trioctylphosphine compound precursor, adding Cd precursor composed of cadmium ethyl xanthate, and keeping the temperature, thereby obtaining CdS clad core-shell quantum dots. The prepared microparticles has the advantages of good crystallinity, even size distribution, controllable particle diameter and the like, and the obtained core-shell structure quantum dots are good in stability and high in fluorescence efficiency; the method has no pilot process so that the operation steps of synthesizing the core-shell structure quantum dots are simple and the cost is low, and a large batch of core-shell structure quantum dots can be synthesized at a time; as a result, group II-VI semiconductor nanomaterials are suitable for actual application, and even industrial batch production.

The invention relates to amphiphilic macromolecular modified oil-soluble nuclear / shell quantum dots and a preparation method. A nuclear layer is of CdSe quantum dots; and a shell layer comprises CdS, an alloy layer, ZnS, an amphiphilic polymer layer from the inside to the outside in turn. The structure of the alloy layer is: Cd0.4Zn0.6S, Cd0.45Zn0.55S or Cd0.6Zn0.4S; the structure of the amphiphilic polymer layer is that: an inner layer is an alkyl chain hydrophobic layer; a connecting layer is aliphatic long carbon chains; and an outer layer is a carboxyl hydrophilic layer; and the particle size range of the quantum dots is between 200 and 1,000 nm. By covering different shell layers with appropriate thickness on the surface of the CdSe nuclear quantum dots, the nuclear / shell quantum dots with high fluorescence efficiency and stable fluorescent properties are synthesized; by performing self-assembly water-solubility modification on self-made amphiphilic polymer and amphiphilic polymer, a formed amphiphilic polymer layer protects the surface structure and fluorescence properties of the nuclear quantum dots, can restrain cadmium ions and selenium ions from diffusing outwards and reduces the toxicity of the quantum dots to organisms; and the modified quantum dots cannot generate fluorescence resonance energy transfer in multi-flux detection.

The invention relates to a rare earth hydrotalcite-like compound / polymer nanocomposite and a preparation method thereof. The method comprises the following steps: firstly prefabricating: dissolving sodium metaaluminate and sodium hydroxide in deionized water to prepare a solution A, dissolving magnesium chloride in deionized water to prepare a solution B, dissolving rare earth oxide with dilute hydrochloric acid and then putting them into the solution B to prepare a solution C, and dissolving a single ligand or a mixed ligand in sodium stearate to prepare a mixed slurry D; then under the action of strong stirring or ultrasonic wave, simultaneously adding the solution A and the solution C dropwisely in the mixed slurry D to prepare a mixed slurry E, aging, conducting pumping filtration, drying the filter cake to obtain a bright fluorescent rare earth hydrotalcite-like compound; and immersing the rare earth hydrotalcite-like compound in a polymer monomer and initiator for 24 hours, and then conducting polymerization to obtain the nanocomposite. The materials disclosed herein has excellent luminescence property of original rare earth complex, and has the advantages of good formability, strong impact resistance, light weight, low cost, easiness in film formation and the like of organic polymer materials.

The invention relates to a water-soluble quantum dot fluorescent nanosphere and a preparation method thereof. The preparation method comprises the following steps of: grafting alkylamine on a side chain of a hydrophilic polymer of polyacrylic acids to prepare an amphipathic polymer; and coating the amphipathic polymer on the surface of a quantum dot by using a reaction system of water / an emulsifying agent / the amphipathic polymer / oil through a phase transfer method to obtain a fluorescent nanosphere with the quantum dot coating quantity of 10-80, the uniform grain size of 30-300nm and favorable dispersibility. The water-soluble quantum dot fluorescent nanosphere is good in fluorescence and colloid stability, capable of being stored for a long term, rich in carboxyl on the surface, capable of being coupled with an antibody and other amino-contained biomolecules such as antibodies, nucleic acids, enzymes, amino acids and even amino-contained inorganic molecules, easy in operation of coupling reaction of carboxyl and amino, high in connection efficiency, simple in preparation process and suitable for large-scale production.

The invention discloses a composite material and a preparation method thereof. The composite comprises perovskite quantum dots and polymers, and the perovskite quantum dots form coordination anchors with the polymers. Compared with the prior art, the composite material has the advantages of simple process, controllable reaction reactions, low cost and adaptation to continuous mass production of industrialization.

A light source device includes a phosphor layer having a side surface, a bottom surface, and an upper surface opposed to the bottom surface, a substrate disposed on the bottom surface side of the phosphor layer, and a reflecting member disposed outside the phosphor layer. The phosphor layer generates fluorescence in response to irradiation with excitation light. The fluorescence generated in the phosphor layer is emitted from the upper surface and the side surface. The fluorescence emitted from the side surface enters the reflecting member.

The present invention is the preparation process of nanometer ZnS:Mn crystal with high fluorescent efficiency and high water solubility and belongs to the field of nanometer material preparing technology. After the water soluble nanometer ZnS:Mn crystal precursor synthesized through co-precipitation process and one kind of zinc mercapto complex are set inside microwave reactor, the zinc mercapto complex is decomposed under microwave heating condition and one layer of zinc sulfide is grown on the surface of the ZnS:Mn crystal precursor, so as to improve the dispersion state of Mn ions inside nanometer ZnS crystal and obtain nanometer ZnS:Mn crystal with high fluorescent efficiency. The process has simple operation and mild reaction condition, and the synthesized nanometer ZnS:Mn crystal has excellent water solubility and relatively high fluorescent quantum efficiency.

The invention discloses a series of fluorescent OLED materials, which have the structure as shown in a formula I. The materials shown in the formula I have delayed fluorescence property; the organic electroluminescent device prepared by utilizing the materials can obtain deep blue organic light emitting diodes, the noble metal phosphorescent materials can be replaced, the manufacturing cost of the OLED device is greatly lowered, the material synthesis and purification methods are suitable for large-scale production, and the materials are an ideal choice of a luminescent material of the organic electroluminescent device.

The invention discloses semiconductor nanocrystals (CdS / ZnSe, ZnSe / CdSe, CdTe / CdSe, CdTe / CdS and the like) with II type structures and a preparation method of the semiconductor nanocrystals and belongs to the technical field of semiconductor nano-material preparation. According to the method, tributylphosphine (TBP) or trioctylphosphine (TOP), which is used internationally at present to dissolve selenium or tellurium to serve as a precursor of selenium or tellurium, is avoided, while a general solvent is adopted to dissolve selenium or tellurium to serve as a precursor of selenium or tellurium. The synthetic process is simple, the repeatability is good, safety and environmental protection are achieved, no glove box is needed, and the cost can be saved by more than 60%. The semiconductor nanocrystals (CdTe / CdSe, CdTe / CdS and the like) with the II type core-shell structures, synthetized according to the preparation method, are 400-650 nm in fluorescence ranges and above 60% in quantum yield and have excellent stability.

The invention discloses a fluorescent nanometer particle with a composite-type silicon shell structure and a preparation method thereof. The shell composition of the fluorescent nanometer particle is silicon dioxide; and the fluorescent kernel is nanometer gold particle of which the surface is combined with rhodamine dye. The method for preparing the fluorescent nanometer particle comprises the following steps: the surface of the nanometer gold particle is wrapped with fluorescent dye and is used as a fluorescent kernel material; and a silicon oxide shell is formed on the surface of the fluorescent kernel through ethyl orthosilicate. The nanometer particle has the advantages of high fluorescent efficiency, simple preparation process, good biocompatibility and the like.

The invention belongs to the technical field of the immunochromatographic and in particular relates to a method for preparing a fluorescent carbon quantum dot, the prepared fluorescent carbon quantum dot and application of the prepared fluorescent carbon quantum dot to an immunochromatographic strip. According to the method for preparing the fluorescent carbon quantum dot, animal and plant colloids are used as raw materials to prepare the carbon quantum dot, the animal and plant colloid contains conjugated molecules such as benzene ring and can form a conjugated agglomerated carbon quantum dot in a reaction process, and the fluorescent carbon quantum dot has high fluorescence property; and furthermore, a polymer is added in a heating reaction process to effectively improve the fluorescence efficiency of the fluorescent carbon quantum dot; and experimental results show that the fluorescence quantum efficiency of the fluorescent carbon quantum prepared by the method can reach 30-50%.