73results about How to "Reduce self-absorption" patented technology

A light emitting device includes a board, a semiconductor light emitting element formed on the board optionally via a submount, a cap sealing the semiconductor light emitting element and a reflector provided surrounding the cap. The cap has top and bottom surfaces that are parallel to the top surface of the semiconductor light emitting element, and the spacing between the top and bottom surfaces is 1-3 times the longest diagonal or the diameter of the semiconductor light emitting element. Also disclosed is a process for producing the device.

The invention provides a cadmium-free core-shell quantum dot and a preparation method thereof; the cadmium-free core-shell quantum dot comprises a quantum dot core, a gradual transition layer continuously grown on the surface of the quantum dot core, and a shell layer formed on the surface of the gradual transition layer, wherein the gradual transition layer comprises core cations and core anions in the quantum dot core, and shell cations and shell anions in the shell layer; in the cadmium-free core-shell quantum dot, the concentrations of the core cations and core anions decrease gradually from inside to outside, and the concentrations of the shell cations and shell anions gradually increase from inside to outside.

The invention provides a packaging process for an LED with a fluorescent glue film and an LED packaging, which comprises that an atomizing device is used for coating a flip-chip surface on which silica gel is already molded with the atomized fluorescent glue, the fluorescent glue is evenly adhered to the molded silica gel surface under the action of the gravity after airflows, and a novel fluorescent glue film structure is formed after being baked and cured at a high temperature. The packaging process does not change the optical property of an LED structure, effectively improves reliability and heat dissipation of the LED structure, reduces self-absorption of phosphor powder, and simultaneously, the structure can be adjusted by being coated repeatedly, so that the color temperature can be adjusted, the produced LED color temperature is concentrated, the cost is greatly reduced, the LED packaging is a simple and practical illuminating light source and is beneficial to popularization of LED lights.

The invention belongs to a fracturing fluid additive, and in particular relates to a formulation of a gas-well water-lock damage treating agent. The formulation is characterized in that the treating agent is formed by matching the following components in weight percentage: 20.0 to 25.0 percent of benzyltributylammonium bromide or benzyltributylammonium chloride as a main agent, 2.0 to 5.0 percent of polyoxyethylene nonyl phenyl ether or sucrose fatty acid ester as nonionic surfactant, 0.5 to 1.0 percent of SR18Y fluorocarbon surfactant produced by Shaanxi Senrui Science and Technology Co., Ltd, 12.0 to 15.0 percent of dodecyl benzyl dimethyl ammonium chloride or hexadecyl trimethyl ammonium bromide as cationic surfactant, and the balance being distilled water. The gas-well water-lock damage treating agent prepared according to the formulation has the advantages of reducing gas-well water-lock damage, lowering starting pressure, improving the gas phase permeability of rock cores and protecting reservoirs.

The invention relates to nano-crystal fluorescent powder and a preparation method thereof. The invention belongs to the technical field of luminescent materials. The nano-crystal fluorescent powder is Cu-In-Znx-E / ZnS, wherein E=S or Se, and x is no smaller than 0. The preparation method comprises steps that: copper salt, indium salt, alkanethiol and octadecene are isolated from oxygen, mixed, andheated; long-chain alkyl organic acid is added to the product, the mixture is isolated from oxygen and is heated, such that a reaction source is obtained; zinc salt, long-chain alkyl organic amine and octadecene are isolated from oxygen, mixed, and heated, such that a zinc source is obtained; when E=S, the zinc source is added to the reaction source, and the mixture is heated, such that a colloidal solution 1 is obtained; when E=Se, selenium powder is dissolved, and an obtained selenium source is added to the reaction source; the mixture is heated, such that a colloidal solution 2 is obtained; the zinc source is added to the colloidal solution 2, and the mixture is heated, such that a colloidal solution 3 is obtained; the colloidal solution 1 or 3 is washed, and is subject to vacuum drying, such that the nano-crystal fluorescent powder is obtained. According to the invention, the nano-crystal fluorescent powder contains no rare earth element; the luminescence wavelength is adjustable;the nano-crystal fluorescent powder can be uniformly dispersed in an organic solvent; and the application range of the nano-crystal fluorescent powder is wide. The preparation method is advantaged inhigh yield, low cost, environment-friendliness, easy operation, and suitability for large-scaled productions.

The invention discloses a two-photon fluorescence probe for detecting peroxynitrite as well as a preparation method and application of the two-photon fluorescence probe. The two-photon fluorescence probe has the structural formula as shown in the description. The two-photon fluorescence probe is named as TPNIR-FP. The two-photon fluorescence probe adopts a Nile red derivative as a fluorescent group and an alpha-keto-amide functional group as an ONOO-reaction group, can rapidly respond to ONOO- (within 10 seconds), and in addition is high in sensitivity and good in selectivity. The two-photon fluorescence probe can be applied to imaging research on ONOO- in antharcycline antibiotic induced cardiac muscle cell and cardiac muscle tissue damage.

The invention belongs to the technical field of synthesis and detection, and particularly relates to a fluorescent probe for detecting peroxynitrite and a preparation method and application thereof. The invention provides a universal identification group for detecting peroxy nitrite, and three new fluorescent probes which are respectively named as BT-FAP, NA-FAP and NR-FAP are formed by connectingthe universal identification group with common fluorophores, wherein aminonaphthalene (BT), naphthalimide (NA) and benzophenoxazine (NR) are the fluorophores, and formamide (FAP) is the identification group to achieve the instant reaction with ONOO (all 4s), the fluorescent probe has high sensitivity and good selectivity, and is very suitable for ONOO fluorescence imaging studies in cells.

The invention belongs to a fracturing fluid additive, and in particular relates to a gas-well water-lock damage treating agent. The agent is characterized in that the treating agent is formed by the following components in weight percentage: 15.0 to 20.0 percent of 2, 3-epoxypropyltrimethylammonium chloride as a main agent, 4.0 to 7.0 percent of nonionic surfactant, 0.5 to 0.8 percent of fluorocarbon surfactant, 5.0 to 8.0 percent of cationic surfactant, and the balance being distilled water. The nonionic surfactant is octylphenol polyoxyethylene ether or dodecyl phenol polyoxyethylene ether. The fluorocarbon surfactant is SR18Y fluorocarbon surfactant which is a product of Shaanxi Senrui Science and Technology Co.,Ltd. The cationic surfactant is di-8 / 10 alkyl dimethyl ammoniumbromide or tetradecyl dimethyl benzyl ammonium. The gas-well water-lock damage treating agent has the advantages of reducing gas-well water-lock damage, lowering starting pressure, improving the gas phase permeability of rock cores and protecting reservoirs.

The invention provides a preparing method of a double-light-emitting transition metal ion doped semiconductor quantum dot, and belongs to the technical field of chemical engineering. The method includes mixing an acetate, sulfur powder and an oil phase solvent to obtain a mixed solution, heating the mixed solution to 200-260 DEG C at a speed of 10-30 DEG C / min, maintaining the temperature for 10-120 min to form mixed-solution crystal nucleuses, adding a zinc precursor solution into the obtained mixed-solution crystal nucleuses, heating to 220-280 DEG C at a speed of 10-30 DEG C / min, maintaining the temperature for 10-120 min to form a zinc sulfide shell mixed solution, and adding a solvent into the obtained zinc sulfide shell mixed solution to obtain the double-light-emitting transition metal ion doped semiconductor quantum dot. The method is simple. Experiments show that the color rendering index after the quantum dot is prepared into white-light LEDs can reach 95, and the luminous efficiency is 701 m / W.

The invention provides a lighting unit (100) comprising a light source (10), configured to generate light source light (11) and a luminescent material (20), configured to convert at least part of the light source light (11) into luminescent material light (51), wherein the luminescent material (20) comprises a phosphor (40), wherein this phosphor comprises an alkaline earth aluminum nitride based material having a cubic crystal structure with T5 supertetrahedra, wherein the T5 supertetrahedra comprise at least Al and N, and wherein the alkaline earth aluminum nitride based material further comprises a luminescent lanthanide incorporated therein.

The invention discloses a preparation method of cerium-doped yttrium aluminum garnet nano / micro-scale spherical fluorescent powder. The material is Y3-xCexAl5O12, wherein x is greater than 0 and smaller than or equal to 0.3. The preparation method provided by the invention is a co-precipitation-solvothermal method and comprises the following steps: firstly, preparing a YAG:Ce<3+> or a YAG precursor by using a co-precipitation method; secondly, carrying out solvothermal reaction in a reaction kettle, with ethylenediamine or an ethylenediamine-alcoholic solution as a solvent, reacting at the temperature of 260 to 290DEG C for 12 to 48 hours; and dissolving and recrystallizing to generate single-phase Y3-xCexAl5O12 fluorescent powder with high yield, high repeatability, higher illumination brightness and high crystallization degree. Without subsequent high-temperature roasting or atmosphere reduction, particle agglomeration caused by calcining is effectively reduced. The preparation method has the advantages that control over size and morphology of materials is realized at relatively-low temperature and pressure; the size of a powder material can be adjusted and controlled within therange of 0.1 to 2.0 [mu]m according to the demand; the process is simple, conditions are easily to control and no special expensive equipment is needed; the materials are stable in performance, regular in spherical morphology and high in dispersity; and a selected reagent is wide in source and easy to obtain.

The invention relates to a preparation method and applications of zero-dimensional lead-free perovskite Cs3Cu2X5, and belongs to the technical field of luminescent materials and LEDs. The preparationmethod adopts a ball milling method, mainly utilizes intermolecular collision to react in a ball milling process, and has the characteristics of simplicity in operation, short reaction time, mild reaction conditions and suitability for batch production. The zero-dimensional lead-free perovskite Cs3Cu2X5 prepared by the invention has the advantages of wide luminescence spectrum, small self-absorption, low cost and the like, and has a good application prospect in fluorescent devices.

The invention provides a photovoltaic power generation system and a manufacture method. The photovoltaic power generation system comprises an array fluorescent optical waveguide and solar cells; the solar cells are arranged in the side surface of the array fluorescent optical waveguide; and the array fluorescent optical waveguide comprises a first substrate, a fluorescent layer and a second substrate which are arranged successively from top to bottom. The system and method are convenient in manufacture technology and easy to realize.

The invention provides a blue fluorescent material which comprises aluminum hydroxide with a chemical formula of Al2O3.nH2O, wherein n is 0.2, 1 or 3; and the material does not contain a rare-earth element. The invention further provides a preparation method for the blue fluorescent material. The blue fluorescent material provided by the invention has the characteristics of small toxicity, a high fluorescent quantum yield, a great light-emitting wavelength range and the like, and is wide in scope of application; and the preparation method for the blue fluorescent material is simple in process and is high in yield.

The invention relates to a two-photon fluorescent probe used for qualitatively detecting concentration of nitric oxide. The two-photon fluorescent probe is named TCO-TP, and includes coumarin and o-diaminobenzene structures, with two kinds of easily-obtained synthesized compounds being initial raw materials, the probe is prepared through two steps of simple and efficient synthesizing reactions, aftertreatment is easy, and purification is easy and convenient. The maximum absorption and the maximum emission of the probe are 348 nm and 440 nm respectively, and large Stokes shift (90 nm) is realized. During in-vitro detection of nitric oxide, the reaction sensitivity of the probe with nitric oxide is high, and the fluorescent response multiple is high. Reaction conditions of TCO-TP and nitricoxide are optimally sieved, and it is found that under physiological conditions (Ph 7.4 and 37 DEG C), the fluorescent response of TCO-TP and NO is optimal. The TCO-TP has quite good selectivity for nitric acid, and specificity detection can be conducted on nitric acid in complex cell and living body biological environments.

The invention discloses a quantum dot with a high blue light absorption rate and a preparation method of the quantum dot. The quantum dot comprises a nucleus which is sequentially coated with a firstshell and a second shell and comprises CdZnSeS, the first shell is made of In2S3, and the second shell is made of ZnS. The outside of the quantum dot is coated with the In2S3, the blue exciting lightabsorption capacity of the quantum dot can be improved, self-absorption of the quantum dot under large concentration is reduced, the luminous intensity of the quantum dot is increased, energy consumption is reduced, high blue exciting light absorption capacity is ensured, the dosage of the quantum dot is reduced, and the quantum dot has low cadmium content and high blue light absorption rate. Besides, the content of heavy metal can be reduced, environmental pollution is decreased, production cost is reduced, and a thin quantum dot film with high brightness and pure colors is acquired and moresuitable for photoluminescence related application taking blue light as an exciting light source.

The invention relates to a quinone type electron withdrawing group type compound, a preparation method and applications thereof. According to the invention, a series of quinone type electron withdrawing group type compounds synthesized by the method have good aggregation-induced emission characteristics; and a probe of aggregation-induced emission type nanoparticles is formed through coating by matching the quinone type electron withdrawing group type compound, an amphoteric compound and a bioorthogonal reaction functional group, and can be used for specifically marking and imaging cancer cells or tumors in vitro or in vivo, so important significance and value is provided in promoting of the fields of bioluminescence detection technology and biomedicine.

The present invention discloses a quantum dot color film filter based on a micro-nano porous structure. The quantum dot color film filter is made by uniformly distributing quantum dots in a hole of amicro-nano porous structure carrier, wherein the aperture size of the micro-nano porous structure carrier is 20-1000nm, the quantum dots are one and more than one of the group of quantum dots with a nanometer ball shape, a nanometer bar shape, a nanometer disc shape and a nanometer ellipsoid shape, the sizes of the quantum dots are 2-2000nm, and are smaller than half of the aperture size of the micro-nano porous structure carrier. The micro-nano porous structure is utilized to simply and effectively improve the capture and the absorption for the backlight with no need for increasing the thickness of the material filter coating and the self absorption of the quantum dots. The color film filter can regulate the aperture size and the distribution of the porous structure and the particle diameters and the morphology of the quantum dots, has good compatibility, and facilitates large-scale, flexible and thin color film filter industrialization.

The embodiment of the invention provides a preparation method of a strontium doping hydroxyapatite composite film, and relates to the technical field of biological material preparation. The method comprises the following steps of mixing a strontium salt solution and a calcium salt solution according to the mol ratio of [Sr] / [Sr+Ca] being (0.1 to 5):100; adding a phosphate solution according to themol ratio of P / [Sr+Ca] being 1:(1 to 2) until precipitates are generated; performing still standing aging for at least 12h; performing suction filtering; taking filter cake; drying the filter cake; putting the filter cake at the temperature of 600 to 1000 DEG C for calcination for 2 to 5h to obtain strontium doping hydroxylapatite powder; mixing chitosan and an acetic acid solution; adding the strontium doping hydroxylapatite powder into the chitosan mixed solution; performing stirring to obtain hydroxylapatite / chitosan suspension, wherein the mass ratio of the chitosan to the hydroxylapatitepowder is (1 to 3):3; rotationally coating the a metal substrate with hydroxylapatite / chitosan suspension; performing drying to obtain the strontium doping hydroxyapatite composite film.

The invention relates to the field of photo-functional materials, in particular to a red light excited fluorescent dye. The red light excited fluorescent dye has a structure shown as the formula (I) in the description. The red light excited fluorescent dye has quite wide excitation spectrum, is good in photostability and high in sensitivity, realizes trace detection, can be used in different application fields such as cell imaging, fluorescence probes, laser dyes, fluorescence sensors and the like, and shows good practicability. According to the preparation method, raw material cost is low, nopollution is produced, the process is simple, and yield is high; the prepared fluorescent dye is novel in structure, good in performance and suitable for being widely applied in the fields of biology, environment and the like.

The invention provides a light emitting device. The light emitting device comprises a base layer, an anode layer, a first hole transport layer, a second hole transport layer, a quantum rod layer, an electron transport layer and a cathode layer which are combined together sequentially from bottom to top. Through replacing a quantum dot light emitting layer in the conventional application as the quantum rod light emitting layer, the external quantum efficiency of the light emitting device can be improved; the quantum rod light emitting layer is a quantum rod layer with a fluorescence wavelengthof 500 to 700 nm, self absorption of the light emitting device can be further reduced, and the external quantum efficiency can be further increased; through using a specific ligand octadecylphosphonicacid to prepare a CdSe core quantum dot and coating the CdSe core quantum dot, fluorescence red shift to a green band, the effect of generating green can be achieved, and the external quantum efficiency of a green light emitting device can be further improved; and the light emitting device preparation method is simple, the raw material is easy to obtain, realization is easy, and wide applicationto industrial production is facilitated.

A light emitting device includes a board, a semiconductor light emitting element formed on the board optionally via a submount, a cap sealing the semiconductor light emitting element and a reflector provided surrounding the cap. The cap has top and bottom surfaces that are parallel to the top surface of the semiconductor light emitting element, and the spacing between the top and bottom surfaces is 1-3 times the longest diagonal or the diameter of the semiconductor light emitting element. Also disclosed is a process for producing the device.

The invention relates to a system and method for rapidly detecting the concentration of 210Po in a molten lead bismuth alloy. By measuring a characteristic gamma ray generated during 210Po decay, the content of 210Po in the molten lead bismuth alloy is quantitatively analyzed. The system and the method which are simple in principle and high in operability are provided for analyzing and detecting the concentration of 210Po, and the system and the method are applicable to rapid detection on the concentration of 210Po in a coolant of a fast reactor primary coolant circuit taking molten lead bismuth alloy as a coolant.

The invention provides a quantum dot fluorescence coded microsphere and a preparation method thereof. The preparation method comprises the following steps: respectively dissolving N kinds of quantum dots with different colors in a mixed solution formed by an oil-soluble monomer and a cross-linking agent to obtain N kinds of oil-phase mixtures, wherein N is greater than or equal to 2; sequentiallydispersing the N oil-phase mixtures into the same emulsifier solution according to the sequence that the wavelengths of the quantum dots dissolved in the N oil-phase mixtures are decreasing so as to form quantum dot micelles; adding the quantum dot micelles and an initiator into water, and carrying out a polymerization reaction under the protection of nitrogen to obtain quantum dot seed microspheres; adding a functional monomer into a polymerization reaction system, carrying out a grafting reaction on the quantum dot seed microspheres and the functional monomer, and carrying out purification treatment after the reaction is finished so as to obtain the quantum dot fluorescence coded microsphere.

The invention discloses a near-infrared fluorescent dye with a large stokes shift and a synthesis method and an application. A structural formula of the fluorescent dye is as shown in the specification. The preparation method of the fluorescent dye comprises the following steps: (1) dissolving an indole iodized salt a and a condensing agent b at the mass ratio of 0.5:1 to 1.5:1 into a toluene-acetic acid mixed liquor, reacting at 110 DEG C for two hours, concentrating to remove a solvent after reaction is ended, and carrying out column separation to obtain an intermediate body c; and (2) dissolving the intermediate body c, and acetophenone, 4-methylacetophenone or 4-methoxyacetophenone at the mass ratio of 1:3 to 1:1 into a potassium hydroxide solution-methanol mixed liquid, reacting at 60-100 DEG C for 15-30 hours, carrying out reduced pressure concentration at 30-60 DEG C for 20-50 minutes after reaction is ended to remove the solvent, and separating through a column, so as to obtain the near-infrared fluorescent dye with the large stokes shift. The fluorescent dye disclosed by the invention has the maximal near-infrared emission wavelength, and has the large stokes shift.

The invention belongs to a fracturing fluid additive, and in particular relates to a gas-well water-lock damage treating agent. The agent is characterized in that the treating agent is formed by the following components in weight percentage: 15.0 to 20.0 percent of 2, 3-epoxypropyltrimethylammonium chloride as a main agent, 4.0 to 7.0 percent of nonionic surfactant, 0.5 to 0.8 percent of fluorocarbon surfactant, 5.0 to 8.0 percent of cationic surfactant, and the balance being distilled water. The nonionic surfactant is octylphenol polyoxyethylene ether or dodecyl phenol polyoxyethylene ether.The fluorocarbon surfactant is SR18Y fluorocarbon surfactant which is a product of Shaanxi Senrui Science and Technology Co.,Ltd. The cationic surfactant is di-8 / 10 alkyl dimethyl ammoniumbromide or tetradecyl dimethyl benzyl ammonium. The gas-well water-lock damage treating agent has the advantages of reducing gas-well water-lock damage, lowering starting pressure, improving the gas phase permeability of rock cores and protecting reservoirs.

Highly thermal and photo-stable inorganic-organic hybrid phosphor compounds, in which a copper (I) halide module is coordinated with a multi-dentate organic ligand. Also disclosed are semiconductor and light emitting devices comprising these materials, including light emitting diodes, and methods of preparing these materials and devices.

Provided are printed patterns and objects including, for example, a film or 3D object, which may include one or more nanorods. According to the subject matter provided, the nanorods may reduce or diminish inter-particle interaction in the pattern or object.

The invention provides a method for measuring a zinc element in electroslag steel by ICP-OES. The method comprises the steps of S1, sampling; S2, waiting for detection; S3, preparing a series of standard solutions; S4, forming a series of standard solutions; S5, establishing a working curve; S6, calculating the content of related elements in the sample according to the working curve; S7, determining working parameters of the instrument; S8, drawing a working curve; and S9, determining the content of the zinc element in the sample solution. According to the method, the number of used samples in the detection process is small, damage to the surface of the steel ingot is minimized, few chemical reagents are used, the whole process from the steel ingot to detection is rapid and environmentally friendly, and the method is simple, convenient and easy to implement. The method disclosed by the invention is small in matrix effect, wide in linear range, low in detection limit, good in precision, less in chemical interference and small in spectral line self-absorption, overcomes the defects in the prior art, and can be suitable for electroslag steel production inspection.