78results about How to "High quantum yield" patented technology

The invention discloses a cesium-lead-bromine / silicon dioxide quantum dot and a preparation method thereof, and belongs to the technical field of quantum dot luminescent materials.The preparation method comprises the steps that at the temperature of 75-95 DEG C, cesium bromide, lead bromide and water are mixed and then magnetically stirred, and a cesium-lead-bromine precursor solution is obtained; at the temperature of 75-95 DEG C, mixing aminopropyltriethoxysilane with the cesium-lead-bromine precursor solution, and then carrying out magnetic stirring to obtain a cesium-lead-bromine / silicon dioxide solution; and drying the cesium lead bromide / silicon dioxide solution at the temperature of 75-95 DEG C to obtain the cesium lead bromide / silicon dioxide quantum dots. The cesium-lead-bromine / silicon dioxide quantum dot has the characteristics of structural stability, acid resistance, 800 DEG C high temperature resistance, water resistance and the like, is long in luminescence life, high in quantum yield and non-toxic, and meets the preparation requirements of flexible wearable devices, light-emitting gratings and other optical devices.

The invention belongs to the technical field of water treatment, and relates to a method for removing new pollutants in water by using a far ultraviolet assisted sodium hypochlorite system. The method comprises the following steps: S1, adjusting the pH value of a to-be-treated aqueous solution containing new pollutants to 4-10; s2, adding a sodium hypochlorite oxidizing agent into the aqueous solution to be treated and continuously stirring; and S3, carrying out a reaction under the ultraviolet wavelength of 200 to 230 nm. Compared with the prior art, the method has the advantages that the far ultraviolet light source and the sodium hypochlorite are jointly applied, so that the oxidation capacity of the sodium hypochlorite is improved, meanwhile, the high-energy characteristic of far ultraviolet light is fully played, efficient photocatalytic degradation of new pollutants difficult to degrade is realized, and the overall water treatment efficiency is remarkably improved.

The invention discloses a quantum dot diffusion plate and a preparation method thereof.The quantum dot diffusion plate comprises an upper layer diffusion plate, a middle layer diffusion plate and a lower layer diffusion plate, and the upper layer diffusion plate and the lower layer diffusion plate are located on the two sides of the middle layer diffusion plate; the middle diffusion plate comprises the following components in parts by mass: PBT resin, PEI polymer microspheres, surface carboxylation oil-soluble CdSe / ZnS quantum dots, glutaraldehyde, ethanol and the like, and the quantum dot diffusion plate prepared by the invention also has the advantages of stable luminescence, high light transmittance, high mechanical strength, fatigue resistance and the like on the premise of keeping high water and oxygen barrier property and luminous efficiency; the advantages of the quantum dot diffusion plate and the PBT resin are integrated, and the application prospect is wide.

The invention provides a europium ion doped titanate compound as well as a preparation method and application thereof, and relates to the technical field of rare earth luminescent materials. The chemical formula of the titanate compound provided by the invention is K2Ti6O13: xEu < 3 + >, the titanate compound is in a monoclinic system. A proper amount of Eu < 3 + > ions are doped in K2Ti6O13, so that the prepared rare earth fluorescent powder has higher color rendering index and quantum yield, and the luminescent property of a white light LED can be greatly improved; as K2Ti6O13 has good electrochemical performance and relatively high conductivity, the rare earth fluorescent powder provided by the invention can also be used in the fields of illumination, display, photocatalysis and energy storage. And on the other hand, the preparation method provided by the invention is simple in process, mild in condition, convenient for large-scale production and wide in development and application space.

The preparation method comprises the following steps: adding a phosphor salt and urea into a carbon source, uniformly stirring, dissolving in water, carrying out a hydrothermal reaction at 180-200 DEG C, carrying out a series of purification operations such as suction filtration, high-speed centrifugation and dialysis, and obtaining the fluorescent carbon dots. Completely evaporating the solvent to dryness, replacing the solvent with equivalent absolute ethyl alcohol, fully dissolving by ultrasound, and filtering by using an organic filter head; the method solves the problems that the existing curcumin content detection cost is relatively high, the detection and analysis index error of a fluorescence analysis method is obvious, and the pretreatment process is relatively tedious. According to the method, after the curcumin and the fluorescent carbon dots have a synergistic effect, the characteristic half-peak width of a fluorescence emission spectrum of the coexisting solution, namely the light color purity in the coexisting solution, is regularly changed, and the content of the curcumin which promotes the change of the light color composition of the coexisting solution is measured according to the numerical value change condition of the half-peak width; and a curcumin quantitative analysis technology taking the high-performance fluorescent carbon dots as a detection medium is realized.

The invention relates to a preparation method of a near-infrared luminous AgPd super-atomic cluster and application of the near-infrared luminous AgPd super-atomic cluster in 3D printing, and belongs to the crossing field of coordination chemistry and nano materials. The chemical formula of the AgPd super-atomic cluster is C216H150Ag14F30P10PdS6 (abbreviated as Ag14Pd), the AgPd super-atomic cluster belongs to a hexagonal crystal system, and the space group is a chiral space group R3 () c. The cluster has strong near-infrared luminescence at room temperature, wherein the optimal emission wavelength in a solid state is 780 nm; the optimal emission wavelength in a solution state is 768nm; the maximum light-emitting quantum yield in a solid state reaches up to 15%. In addition, the super-atomic cluster also shows excellent thermal stability. The cluster has high optical activity and solubility at room temperature, can be used as ink for 3D printing to print macroscopic models of various shapes and sizes, and shows that the near-infrared luminous cluster material has potential application prospects in photoelectric devices.

The invention discloses a synthetic method of a degradable polystyrene material with multicolor fluorescence. According to the method, a multi-color fluorescent polymer material with conventional luminescence property and aggregation-induced emission (AIE) property is obtained through cationic polymerization and Friedel-Crafts reaction, polymer materials with different fluorescence colors can be obtained by adjusting the reaction ratio of an active monomer to a catalyst and the reaction temperature, adjustable emission wavelength can be achieved, and the method is suitable for large-scale industrial production. And recycling can be realized through degradation. The synthesis method of the multi-color fluorescent degradable polystyrene material has the characteristics of simple operation, low synthesis cost, excellent material photophysical properties and the like, the obtained multi-color fluorescent polymer has conventional luminescence properties and AIE properties, the aggregation state fluorescence is enhanced, and the fluorescence intensity is enhanced. Good application prospects are realized in the fields of optical anti-counterfeiting, imaging marks, photoelectric elements and the like.

The invention discloses a polyamine carbon dot as well as a preparation method and application thereof in improvement of corn resistance, and belongs to the technical field of nano agricultural regulation and control. The polyamine carbon dots are subjected to hydrothermal synthesis, the size of the PEICDs is 2.3 nm, the quantum yield of the carbon dots can be increased, carbon dioxide in the atmosphere can be captured and converted into bicarbonate radicals, and it is verified through in-vitro experiments that the PEICDs can improve the carbon dioxide conversion product 3-phosphoglycerate in vitro; under the stress of drought and salt, the polyethyleneimine functionalized carbon dot solution is applied to the leaf surfaces of the crops, so that the growth and development of the crops can be improved by remarkably improving the net photosynthetic rate and the intercellular carbon dioxide concentration, and the adaptability of the crops to the environment is further improved.

The invention relates to a preparation method and application of selenium-doped carbon quantum dots. The selenium-doped orange fluorescent carbon quantum dots are successfully prepared by treating a mixture of mangosteen peel, ethanol and sodium selenite through a hydrothermal method. Based on the excellent fluorescence property of the carbon quantum dots, the Cr < 2 + > can quench the fluorescence of the selenium-doped carbon quantum dots, so that the Cr < 2 + > can be detected. Meanwhile, the carbon quantum dot is found to be responsive to disease micromolecule glutathione, that is, glutathione can enhance fluorescence of the carbon quantum dot. By utilizing the concentration difference of glutathione in normal cells and cancer cells, the carbon quantum dots can realize the recognition of tumor cells. The orange fluorescent carbon quantum dot provided by the invention is prepared from easily available raw materials, and is safe and non-toxic. The prepared carbon quantum dot has stable fluorescent property, uniform particle size of 4.2 + / -0.5 nm, and relative quantum yield of 34.35%, can be imaged in cells, has GSH detection limit of 27.16 umol / L, and can identify tumor cells and normal cells.

The present invention relates to a method for preparing 2,3-butanediol from ethanol. The method uses a semiconductor photocatalyst and a metal salt additive to convert ethanol into 2,3-butanediol under light, and simultaneously generates hydrogen. Starting from ethanol, the method improves the selectivity of 2,3-butanediol and the conversion rate of ethanol through the metal salt additive, and has the advantages of wide raw material sources, high atom economy, good reaction selectivity and mild reaction conditions.

The invention discloses a fluorescent probe capable of simultaneously detecting cysteine and tryptophan and a synthesis method and application thereof, the structure of the fluorescent probe is shown as a compound 1, and the prepared fluorescent probe shows relatively strong near-infrared fluorescence and good water solubility, has a strong fluorescence emission peak near the wavelength of 700 nm, and shows good fluorescence spectrum performance. The prepared fluorescent probe shows remarkable specificity and sensitivity in detection of cysteine and tryptophan.

Provided is a method for producing solid-state carbon quantum dots having high emission quantum yield through simple processes. To solve the above issue, a method for producing carbon quantum dots is a method for producing the carbon quantum dots which are solid at 25°C under 1 atm, the method including: preparing a mixture by mixing an organic compound and a boron compound, the organic compound having a reactive group and not containing a boron atom; and preparing carbon quantum dots by heating the mixture with substantially no solvent at 100°C or higher and 300°C or lower. An amount of a nitrogen atom in the organic compound is 20 mass% or greater, and an amount of the boron compound with respect to a total amount of the organic compound and the boron compound is 20 mass% or greater.

The invention relates to a post-treatment method for a mercury-based II-VI group nanocrystal with a protective layer formed by chemical oxidation, and solves the problems of poor stability and photoelectric property degradation of the mercury-based II-VI group nanocrystal caused by surface oxidation, ligand desorption and environmental sensitivity. An oxide protection layer with the thickness of 1-3 nm is formed on the surface of the nanocrystal, the long-term stability and the photoelectric property of the nanocrystal are improved, and the method comprises the specific steps of centrifugal purification of the nanocrystal, preparation of an oxidizing agent solution, controllable oxidation reaction, functional ligand surface modification and purification treatment. The oxidation layer is ensured to be compact and stable by accurately adjusting the concentration of the oxidant, the reaction temperature and the reaction time. According to the method, oxygen and moisture permeation is effectively blocked, surface defects are reduced, the quantum yield and the photoelectric property are improved, and the method is widely applied to the fields of post-treatment of mercury-based II-VI group nanocrystals and photoelectric devices.

The invention relates to the field of fluorescent nanomaterials, and in particular to a fluorescent probe for detecting gatifloxacin and an application thereof in food. The invention uses bear bile powder as a precursor to prepare a novel biomatrix-derived carbon quantum dot, and constructs a highly selective fluorescent sensing platform, which is successfully used to detect gatifloxacin in milk and honey. The prepared carbon quantum dots show obvious concentration dependence. Under sunlight, as the concentration of the carbon quantum dots increases, the color of the solution gradually changes from light yellow to orange-yellow, and under ultraviolet light, it shows a transition from blue fluorescence to green fluorescence. By establishing a linear relationship between the fluorescence signal intensity and the gatifloxacin concentration, sensitive detection of gatifloxacin is achieved, and the detection limit can be as low as 3 μg / L, which proves the excellent performance of the fluorescent probe and provides a certain reference value for the application of biomatrix-derived carbon quantum dots in the field of food safety detection.

The invention relates to the technical field of biomedical detection, and discloses a kit for detecting pancreatic cancer based on a fluorescence labeling method and application of the kit, and the kit is composed of eutectic solvent precursor dispersion liquid containing an interface stabilizer and a polycarboxylate regulator. According to the method, the deep eutectic solvent is driven to be separated out from the water phase by utilizing the strong hydration capability of the polycarboxylate regulator, and the microphase enrichment region with low water content is constructed in situ. In the enrichment area, a compact hydrogen bond network limits free movement of water molecules, and a non-radiative transition channel for transferring excited state energy of fluorescent molecules to a hydroxyl vibration energy level of the water molecules is blocked. The unique microenvironment mechanism significantly reduces the fluorescence quenching effect in an aqueous system, greatly improves the quantum yield and detection sensitivity of the fluorescent probe, and effectively solves the technical problem of weak signal in traditional aqueous phase immunodetection.

The invention discloses a plasmon core-shell quantum dot and a preparation method thereof, and belongs to the technical field of quantum dot luminescent materials.The preparation method comprises the steps that S1, silver nitrate and sodium hydroxide are added into methylthiouracil, then magnetic stirring is conducted at the temperature of 20-35 DEG C, ultrafiltration centrifugation is conducted through an ultrafiltration centrifuge tube, and a plasmon core-shell quantum dot solution is obtained; an inner layer silver core solution of the plasmon core-shell quantum dot is obtained; s2, sodium hydroxide, chloroauric acid and methylthiouracil are added into the inner layer silver core solution of the plasmon core-shell quantum dot, then magnetic stirring is conducted at the temperature of 20-35 DEG C, and the plasmon core-shell quantum dot is obtained. The plasmon core-shell quantum dot disclosed by the invention is high in luminous intensity, high in quantum yield, adjustable in luminous wavelength and adjustable in excitation wavelength, and can be used for preparing a luminous grating and a display device.

The present invention relates to a polymethoxy-substituted Aza-BODIPY compound and the application of the Aza-BODIPY compound as an ACQ probe in fluorescence tracing of nanoparticles in vivo, wherein the Aza-BODIPY probe has the following characteristics: 1) Aza-BODIPY has a methoxy group in the para position of the benzene rings at positions 1, 3, 5, and 7, forming a six-membered ring structure on one side; 2) stable fluorescence is emitted when encapsulated in the hydrophobic core of a nanocarrier; 3) after the nanocarrier is degraded or depolymerized, the probe is released, aggregates when encountering water, and the fluorescence is rapidly and completely quenched; 4) there is no obvious fluorescence recurrence, which can reduce the interference of flat fluorescence recurrence. The "ON→OFF" fluorescence switching mode can effectively eliminate the interference of free probe signals, making real-time monitoring of nanocarrier particles in vivo and in vitro more accurate. The method of the present invention can currently be applied to nanocarriers with a highly hydrophobic matrix (lipid or polyester nanoparticles) or a hydrophobic core-hydrophilic shell structure (micelles).

The invention provides a phenanthrenequinone-containing rhodamine 6G fluorescent probe for acid-base detection as well as a preparation method and application of the phenanthrenequinone-containing rhodamine 6G fluorescent probe. The structure of the phenanthrenequinone-containing rhodamine 6G fluorescent probe is shown as follows: the # imgabs0 # phenanthrenequinone-containing rhodamine 6G fluorescent probe has high molar absorption coefficient and quantum yield, so that the # imgabs0 # phenanthrenequinone-containing rhodamine 6G fluorescent probe can realize low-detection-limit and high-sensitivity pH value detection, shows good light stability and is suitable for being applied to long-term experiments and complex environments.

The invention relates to the field of organic light-emitting materials, and discloses a color conversion composition, a blue light-driven LED and a preparation method thereof, organic boron heteropolycyclic aromatic hydrocarbon organic light-emitting materials (BODIPY and BN) in the color conversion composition are utilized, the molar extinction coefficient is large, the emission spectrum half-peak width is very narrow (10-50 nm), the quantum yield is high, and the thermal stability and chemical stability are good. Compared with the prior art, the color conversion film provided by the invention has the characteristics of simple structure and diverse structure, can realize complete coverage from the whole visible light area to the near-infrared light area, and has excellent compatibility with a base material (such as binder resin), so that the color conversion film with excellent performance is formed, and green light and red light with high luminous efficiency and high color purity can be obtained when the color conversion film is applied to an LED driven by blue light, so that the color rendering index of the LED is improved.

According to the aryl boron nitrogen narrow-emission fluorescent material and the preparation method and application thereof, groups with different electron donating capacities are introduced to the periphery of aryl boron nitrogen, an organic light-emitting material with the space charge transfer characteristic is formed, the structure of a device is simplified, and the performance and the service life of the device are improved. The narrow-emission fluorescent material has unique narrow-band emission, high luminous intensity and delayed fluorescence, good thermal stability and good solubility, and has remarkable economic value in the application aspects of preparation of luminescent materials, luminescent devices or intelligent materials and the like.

The invention relates to the technical field of titanium-based metal-organic framework materials, in particular to a preparation method and application of sound-sensitive nano-particles MIL-125 at-I3C based on a titanium-based metal-organic framework. Titanium and 2-amino terephthalic acid H2ATA organic ligand are bridged, defects are regulated and controlled through high-temperature calcination, and the sound-sensitive nano-particles MIL-125 at-I3C are obtained. The preparation method comprises the following steps: preparing a titanium-based metal-organic framework material MIL-125 with high sound-sensitive activity and good biocompatibility, and covalently binding a metabolic regulator indoletricarboxaldehyde I3C with the MIL-125 through Schiff base reaction to generate MIL-125-at-I3C. According to the invention, MIL-125 at-I3C is effectively accumulated in the tumor through the high permeability of the solid tumor and the retention effect EPR effect, and the sonodynamic therapy of the tumor part is realized under ultrasonic irradiation. The preparation method disclosed by the invention is simple, high in efficiency and low in cost, and meanwhile, the prepared nanoparticles release I3C at a tumor site to enhance the generation of immune factors, can generate a large amount of reactive oxygen species (ROS) under ultrasonic irradiation to induce tumor immunogenic death, and has a wide application prospect in the field of integrated tumor treatment.

The invention discloses a bimetallic carbon nanocube doped alginic acid hydrogel and a preparation method thereof, Cu-Co carbon nanocubes are doped into sodium alginate, and the hydrogel is formed in a FeCl3 solution by utilizing a titration method. The hydrogel prepared by the method disclosed by the invention can efficiently degrade pollutants in water under the synergistic effect of the hydrogel and hydrogen peroxide under illumination, and has good stability and recoverability. Compared with the prior art, the preparation method provided by the invention has the characteristics of simple and easy-to-control process, low manufacturing cost, small environmental pollution and the like, can realize industrial production, and can be applied to the technical field of environment.

This invention discloses a near-infrared fluorescent silicon dot, its preparation method, and its application in antibacterial and tumor treatment. The silicon dot is generated via a one-step hydrothermal method through a high-temperature condensation reaction between the carboxyl group of a 4-carboxyporphyrin dye and the amino group of a silane coupling agent. The silicon dot synthesized in this invention exhibits excellent water dispersibility, high near-infrared fluorescence intensity and pH stability, uniform morphology, good photostability, good biocompatibility, and high reactive oxygen species (ROS) yield. Furthermore, the preparation method is simple and convenient, uses widely available raw materials, and is low-cost, making it suitable for industrial production. Based on these excellent properties, it can be used to prepare fluorescent probes as fluorescent markers for cell and biological imaging. Its excellent singlet oxygen generation performance can be used for photodynamic therapy against bacteria and tumors. In addition, the silicon dot also possesses peroxidase properties, catalyzing the generation of hydroxyl radicals from hydrogen peroxide, thus enabling its use in chemokinetic therapy.

The invention relates to the technical field of road traffic, in particular to a traffic facility sign with double functions of light reflection and light storage and a preparation method of the traffic facility sign. A traffic facility sign with double functions of light reflection and light storage sequentially comprises a non-woven fabric layer, an adhesive layer, a noctilucent and light-reflecting layer and a mask layer from bottom to top. The luminous and reflective layer comprises reflective glass beads and light-storing glass beads, and the mass ratio of the reflective glass beads to the light-storing glass beads is 1: (0.5-2.5). According to the traffic facility sign with the dual functions of light reflection and light storage, the traffic facility sign capable of emitting light is improved under the condition that road illumination is not good, a driver can still recognize the traffic sign when a vehicle headlamp cannot irradiate the traffic facility sign, and therefore the warning effect is achieved in advance, and the traffic facility sign is more convenient to use. And the position of the guardrail and the direction of the road are clearly marked, traffic accidents caused by limited sight during night driving are reduced, and the road guardrail has lasting use performance.

The application discloses a cycloalkane oxime ester photoinitiator and a preparation method and application thereof, and belongs to the field of chemical synthesis and photocuring technology. The photoinitiator has a structure as shown in the formula (I).

The invention discloses a fluorescence analysis and detection method and system based on quantum dots, and belongs to the technical field of analysis and detection. According to the method, functional modified quantum dots are used as fluorescent probes, a fluorescence detection system is constructed through specific recognition reaction, and high-sensitivity and high-specificity detection of a target detection object is realized by combining collection and quantitative analysis of fluorescence signals. The corresponding system comprises an excitation light source module, a sample reaction module, a fluorescence detection module, a data processing module and a control module, all the modules work cooperatively, key parameters in the detection process can be precisely regulated and controlled, and the detection precision and stability are improved. The method solves the problems of poor probe stability, low quantum yield and high detection limit in a traditional fluorescence detection method, has the advantages of high detection speed, high specificity and wide application range, and can be widely applied to the fields of food safety detection, environmental pollutant monitoring, biomedical diagnosis and the like.

The present invention discloses a fluorescence-enhanced noble metal nanomaterial and a method for adjusting fluorescence wavelength. First, a noble metal fluorescence pressure sensing material is provided, which is composed of a gold complex layer and a phosphine ligand layer covering the gold complex layer, and can display a fluorescence pressure trajectory under pressure; in addition, a fluorescence-enhanced noble metal nanomaterial is provided, which is obtained by mixing and fully grinding a gold complex and a phosphine ligand, has a strong golden fluorescence, and has a certain thermal stability. After synthesis, the fluorescence performance is greatly improved compared with the fluorescence intensity of the precursor complex. The present invention can realize the ligand exchange of the complex through simple operation; the fluorescent material can realize the adjustment of the fluorescence wavelength under different states. The fluorescent material of the present invention can be applied to the field of pressure tracking sensors, and has important potential application value in the fields of organic light-emitting diodes, fluorescent probes, biological imaging and fluorescence sensing.

The invention discloses a chemical upgrading recovery method of polystyrene plastics. The method is based on Friedel-Crafts reaction (Friedel-Crafts Reaction), and a class of multicolor polymer fluorescent materials with conventional luminescence property and aggregation-induced emission (AIE) property are obtained. Polymer materials with different fluorescence colors can be obtained by regulating and controlling the reaction ratio and reaction temperature of the polystyrene plastic and the catalyst, and the adjustable emission wavelength is realized. The chemical upgrading recovery method of the polystyrene plastic has the characteristics of wide raw material source, simple operation process, low cost, easiness in large-scale production, stable property and the like. The obtained multicolor fluorescent polymer material has strong fluorescence and high quantum yield in a solid powder state or a solution state, and has better application prospects in the fields of plastic recovery, plastic modification, plastic processing, biomedical treatment, fluorescent labeling, organic photoelectricity, chemical sensing and the like.

The invention relates to the technical field of organic electroluminescent materials, and particularly discloses a thermally activated delayed fluorescent material based on a rigid pi-bridge construction strategy and application thereof, and the thermally activated delayed fluorescent material is prepared by taking pyrenequinoxaline as a conjugated pi bridge to connect a cyanobenzene acceptor (A) unit and a triphenylamine (TPA) donor (D) unit, the preparation method comprises the following steps: constructing a structure of a novel TADF material TPA-PyQl-BzCN with a D-A molecular structure through suzuki coupling; pyrene quinoxaline is used as a conjugated pi bridge, a cyanobenzene acceptor (A) unit and a triphenylamine (TPA) donor (D) unit are connected, a novel TADF material TPA-PyQ l-BzCN with a D-A molecular structure is constructed through suzuki coupling, and the TADF material is a brand-new TADF material constructed by a large conjugated pi bridge unit, is used for molecular construction of a thermally activated delayed fluorescent material, and has a wide application prospect. A new construction strategy is provided for thermally activated delayed fluorescent materials, and the variety of organic near-infrared luminescent materials is expanded.

The application provides a fluorescent imaging probe based on a covalent organic framework, a preparation method and application. The fluorescent imaging probe is successfully prepared by the preparation method, the fluorescent intensity of the fluorescent imaging probe has a good linear relationship with the concentration of iron ions, the fluorescent imaging probe can be used for detecting the concentration of iron ions, and the fluorescent imaging probe has excellent biocompatibility and can be used for in vivo fluorescent imaging.