56results about How to "Enhanced fluorescence emission intensity" patented technology

The invention relates to application of polyamide-amine (PAMAM) dendrimer coated ZnX (X=S, Se, Te) semiconductor quantum dots in fingerprint development, belonging to the technical field of material preparation. The method comprises the following steps: synthesizing a PAMAM dendrimer coated ZnX semiconductor quantum dot solution; and carrying out fluorescence labeling on latent fingerprints by using the PAMAM dendrimer coated ZnX semiconductor quantum dot solution. The method provided by the invention avoids the problem of toxicity of heavy metal ion Cd<2+> in the existing developing reagent, and the PAMAM dendrimer coated ZnX semiconductor quantum dots are harmless to the environment and users; the addition of the metal ion M<2+> can further enhance the fluorescence-emission strength of the ZnX semiconductor quantum dots; and by using the interaction between the PAMAM dendrimer and the fingerprint residue, the invention reserves the high development efficiency in the physical development method, and overcomes the defect of insufficient detailed development of fingerprint lines in the physical development method, thereby enhancing the precision and accuracy of the latent fingerprint development.

The invention belongs to the field of micro-molecular fluorescence probe, and especially relates to a near-infrared fluorescence probe used for detecting zinc ions in a water phase, a preparation method thereof, and an application thereof in biological living cell detections. The structural formula of the near-infrared fluorescence probe used for detecting zinc ions in the water phase is represented by the following, wherein X is halogen, perchlorate, nitrate, or bisulfate. When the fluorescence probe provided by the invention is subject to a reaction in a water phase with zinc ions, the fluorescence emission intensity is enhanced. Therefore, the probe is advantaged in good selectivity, high sensitivity, and the like. The emission peak of the fluorescence spectrum is in the near-infrared zone, such that the probe is advantaged in low cytotoxicity and good cell membrane permeability. The fluorescence probe provided by the invention can be used in intracellular zinc ion detection and fluorescence imaging.

The invention belongs to the technical field of optoelectronic information, and particularly relates to a preparation technique of a nanometer crystal surface graph-strengthened light-emitting composite glass film. The preparation method comprises the following steps: sequentially preparing the glass film containing the light-emitting materials and the graphic film layer containing the metal materials, such as silver, gold or copper, on the glass, single-crystal or polymeric optical substrate surface; enabling the metal ions in the graphic film layer to directionally diffuse into the glass film containing the light-emitting materials and forming the metal (such as silver, gold or copper) nano-crystal in graphical distribution by employing the DC electric field induction thermal transfer printing technique; and improving the fluorescence efficiency of the light-emitting materials by adopting the surface plasma fluorescence enhancement effect of the metal nano-crystal, and further realizing the graphical light-emitting of the glass film. The nano-crystal enhanced graphical light-emitting film prepared based on the technique is applicable to the fields, such as optical information recording, displaying and processing.

The invention relates to a preparation method of a fluorescent biosensor of a double-cycle and double quenching system based on functionalized graphene quantum dots. The method comprises the followingsteps: weighing raw materials including citric acid, histidine and pentaethylene hexamine at the molar ratio of 0.01:0.1:1 to 1:1:1, uniformly mixing, adding deionized water, then performing ultrasonic dissolution to obtain a reaction solution, placing the reaction solution in an oven, reacting for 0.5-10h at an oven temperature of 150-250 DEG C to directly obtain a crude product of pentaethylenehexamine-histidine graphene quantum dot PEHA-GQD-His after reaction, then obtaining an LDNA-capped pentaethylene hexamine-histidine graphene quantum dot PEHA-GQD-His solution, finally forming a G-quadruplex / DNase, and finally adding 0.5-100[mu]l of H2O2 with the molar concentration of 0.1-10[mu]M to obtain the fluorescent biosensor of the double-cycle and double quenching system.

The invention discloses Er<3+> / Ce<3+> / Yb<3+> tri-doped tellurate glass containing silver nano particles and a preparation method thereof. The glass consists of the following components in percentage by mole: 65-75mol% of TeO2, 5-10mol% of Bi2O3, 10-20mol% of ZnO, 5-10mol% of Na2O, 0.1-1.0mol% of Er2O3, 0.1-1.0mol% of Ce2O3, 0.4-2.0mol% of Yb2O3 and 0.1-1.0mol% of AgNO3. The tellurate glass has the following advantages that by adopting tellurium oxide as a main component and adding bismuth oxide, zinc oxide and sodium oxide, the forming ability and physical-chemical stability of the glass are improved; due to the tri-doping way of rare earth Er<3+>, Ce<3+> and Yb<3+> ions, the sensitization among the rare earth ions is sufficiently utilized to improve the luminous efficiency of the rare earth Er<3+> ions under a commercial 980nm-wavelength semiconductor laser diode pump; and the fluorescence emission intensity of the doping Er<3+> ions in the 1.55mu m near infrared waveband is enhanced by the local field enhancement effect of the silver nano particles.

The present invention is one kind of 2-substituted rubrene compound as shown and its synthesis process. The synthesis process includes the first synthesis of 2-formoxyl rubrene, and the subsequent oxidation, reduction and condensation with 2-formoxyl rubrene to obtain other 2-substituted rubrene compound. The synthesis process of 2-formoxyl rubrene under protection of inert gas includes the first reaction of 2-formoxyl -6, 11-diphenyl-5, 12-tetracene quinine material with glycol and catalyst at 120-160 deg.c; the subsequent reflux reaction with phenyl magnesium bromide and anhydrous tetrafuran; and final reflux reaction with iron powder and glacial acetic acid under heliophobic condition to obtain 2-formoxyl rubrene. The 2-substituted rubrene compound of the present invention as new type of red fluorescent material has high fluorescence quantum efficiency and may be used as the luminous material in electroluminescent device.

The invention belongs to the technical field of environmental science, and discloses an environmental micro-plastic labeled by metal organic fluorescent complex, and a preparation method and application of the environmental micro-plastic. The preparation method comprises the following steps: (a) dissolving a metal organic fluorescent complex by using an organic solvent to obtain a metal organic fluorescent complex solution, wherein the micro-plastic can be swelled through the organic solvent; and (b) soaking the micro-plastic in the metal organic fluorescent complex solution, and carrying outseparating and drying to obtain the environmental micro-plastic labeled by the metal organic fluorescent complex. The method provided by the invention is simple, the adjustability is strong, and the micro-plastic with different physical and chemical properties is easy to obtain; the generation of pseudo-fluorescent signals can be avoided through the environmental micro-plastic labeled by the metalorganic fluorescent complex; the interference of the spontaneous fluorescence background is less, and the detection accuracy is high; and the fluorescence emission intensity can be enhanced through the increase of the concentration, and the detection sensitivity of fluorescence imaging is improved. The environment micro-plastic provided by the invention is used for simulating the environmental exposure and health effect of environmental micro-plastic pollutants.

The invention provides a method for enhancing fluorescence of an upconversion material, belonging to the field of inorganic chemical materials. The method solves the problem of low luminescence efficiency in the existing upconversion material. The method combines the homogeneous coating structure with the noble metal shell structure for the first time, and utilizes the noble metal plasma resonance effect to further enhance the fluorescence emission intensity of the system. The experimental result indicates that the method can enhance the fluorescence emission intensity of the upconversion luminescent material by 5 times.

The invention provides a sulfide-based triple-doped electron trapping material and a preparation method thereof and relates to the technical fields of light emission and light storage. The invention solves the problems that the conventional Eu<2+> and Sm<3+> double rare earth doped sulfide system has low optical excitation luminous intensity and low light storage performance. The chemical formula of the electron trapping material is Sr1-x-y-zEuxSmyRezS, wherein the Re represents Er, Dy, Tm, Yb, Tb or Gd; x, y and z are the molar fraction of the elements; x is more than or equal to 0.0001 and less than or equal to 0.02; y is more than or equal to 0.0001 and less than or equal to 0.02; and z is more than or equal to 0.0001 and less than or equal to 0.006. The electronic storage quantity of the electron trapping material is increased by 1 to 4 times as compared with the electronic storage quantity of the sulfide Eu<2+> and Sm<3+> double-doped material; the optical excitation luminous intensity and the storage performance of the material can be effectively improved; and the commercial requirement can be met.

The invention relates to a method for preparing fluorescent carbon quantum dots by taking metformin as a precursor. The method comprises the following steps: step 1, carrying out hydrothermal reactionon metformin hydrochloride and dithiodibenzoic acid to generate a carbon quantum dot stock solution; step 2, filtering out impurities from the carbon quantum dot stock solution to form filtrate; step3, after the filtrate is subjected to heating and magnetic stirring treatment, attaching carbon quantum dots in the filtrate to a first filter membrane through the first filter membrane; and step 4,drying the first filter membrane to obtain carbon quantum dot powder. The purity of the final product is higher than that of fluorescent carbon dots with natural organic matter as a carbon source, thereaction process and structure can be analyzed, no toxic reagent is added, the operation method is simple and convenient, and finally the fluorescent carbon quantum dots with high fluorescence emission intensity can be prepared on a large scale.

The invention discloses a method for preparing a polyolefin / rare earth complex / carbonate composite fluorescent material. The method is characterized in that by preparing a rare earth complex / carbonate compound and a polyolefin-organic solvent solution, the rare earth complex / carbonate compound and the polyolefin-organic solvent solution are mixed and reacted, after the reaction is completed, and a mixture is filtered and dried to obtain the polyolefin / rare earth complex / carbonate composite fluorescent material. The structure of the composite fluorescent material is a polyolefin-coated rare earth complex / carbonate compound, the fluorescence intensity is large, under same luminous intensity condition, the usage of rare earth elements is greatly reduced, and the production cost is reduced. The invention provides the method for preparing the polyolefin / rare earth complex / carbonate composite fluorescent material, the method is easy to operate, and the loss of the rare earth elements can be effectively avoided.

The invention relates to the technical field of nucleic acid detection, particularly to a quinoline aromatic ethylene derivative and applications in preparation of fluorescent dyes and fluorescent probes, wherein the quinoline aromatic ethylene derivative is a compound represented by a formula I or a pharmaceutically acceptable salt thereof, and a solvent compound, an enantiomer, a diastereoisomer, a tautomer or a mixture of the solvent compound, the enantiomer, the diastereoisomer and the tautomer of the compound represented by the formula I or the pharmaceutically acceptable salt thereof according to any ratios, wherein the derivative comprises a racemic mixture. According to the invention, the compound is simple in preparation method, has high fluorescence response to nucleic acid, hascharacteristics of low biotoxicity, low phototoxicity, good water solubility and good cell permeability, has strong binding constant and low detection limit in the field of detection, and can be usedin the preparation of fluorescent dyes and fluorescent probes.

Disclosed are praseodymium-doped borophosphate base near-infrared ultra wide band luminescent glass and a preparation method thereof. The glass comprises 45-83 mol% of P2O5, 5-35 mol% of B2O3, 4-23 mol% of Al2O3, 6-22 mol% of Y2O3 and 0.1-3 mol% of Pr2O3. The preparation method of the glass includes the steps of raw material weighing, presintering, founding, pouring, annealing and the like. The preparation method is simple in process, high in ultra wide band near-infrared fluorescence-emission characteristic with emission wavelength of 830-1700nm and capable of improving the stability of the glass, reinforcing the luminous intensity of praseodymium ions, and satisfying the requirement of optical fiber wiredrawing.

The invention discloses near-infrared luminescence transparent glass ceramic. A composition general formula of the near-infrared luminescence transparent glass ceramic is aSiO2-bAl2O3-cCaO-dNa2O-eIn2O3-xEr2O3, wherein a, b, c, d, e and x are molar fractions, and the data ranges are respectively as follows: a is greater than or equal to 40 and is less than or equal to 65, b is greater than or equal to 10 and is less than or equal to 25, c is greater than or equal to 7 and is less than or equal to 15, d is greater than or equal to 12 and is less than or equal to 25, e is greater than or equal to 1 and is less than or equal to 15, x is greater than or equal to 0.01 and is less than or equal to 2, and a+b+c+d+e+x=100. The near-infrared luminescence transparent glass ceramic disclosed by the invention is prepared through a melt quenching method, and an obtained material has the characteristic of near-infrared emission under bandwidth ultraviolet excitation.

Disclosed are praseodymium-doped borophosphate base near-infrared ultra wide band luminescent glass and a preparation method thereof. The glass comprises 45-83 mol% of P2O5, 5-35 mol% of B2O3, 4-23 mol% of Al2O3, 6-22 mol% of Y2O3 and 0.1-3 mol% of Pr2O3. The preparation method of the glass includes the steps of raw material weighing, presintering, founding, pouring, annealing and the like. The preparation method is simple in process, high in ultra wide band near-infrared fluorescence-emission characteristic with emission wavelength of 830-1700nm and capable of improving the stability of the glass, reinforcing the luminous intensity of praseodymium ions, and satisfying the requirement of optical fiber wiredrawing.

The invention relates to a targeted mesoporous molecular imaging probe and a preparation method thereof. The targeted mesoporous molecular imaging probe comprises two parts including a surface plasma resonance core layer and a peripheral coating layer, wherein the surface plasma resonance core layer at least comprises a gold nanorod I, a gold nanorod II and substrate nano particles; the peripheral coating layer is formed by fluorescent molecules, sulfydryl small biological molecules and polystyrene sulfonate connectors; the gold nanorod I and the gold nanorod II are cohered on the substrate nano particles, so that the surface plasma resonance core layer can be formed; the distance between the gold nanorod I and the gold nanorod II meets the condition that d is more than or equal to (r1-r2) / 2 and less than or equal to (r1+r2) / 2; the exterior of the core layer is combined with the sulfydryl small biological molecules by a gold sulfhydryl bond, the fluorescent molecules are combined with the sulfydryl small biological molecules by an amide covalent bond, and polystyrene sulfonate is directly connected on a substrate in a bridging way. The invention also provides the preparation method of the targeted mesoporous molecular imaging probe. Blue shift or red shift is generated by surface excitation, and the characteristics of luminescence of a fluorescent structure are matched, so that the brightness is increased by 8-10 orders of magnitude. The targeted mesoporous molecular imaging probe has very high fluorescence characteristic, thus being applied to the diagnosis of tumor fluorescence imaging; the targeted mesoporous molecular imaging probe is especially suitable for detection and diagnosis of tumors in the dark field at the deep part of tissue cells.

The invention discloses a method for detecting hexachlorobenzene. The method comprises the hexachlorobenzene and particularly comprises the following completing steps of: firstly, irradiating alcohol solution polluted by the hexachlorobenzene by using ultraviolet light, then, measuring the intensity of a fluorescence emission spectrum of the hexachlorobenzene in a hexachlorobenzene alcohol solution by using a fluorescence spectrograph, and obtaining the content of the hexachlorobenzene, wherein the wavelength range of the ultraviolet light is 340-380 nm, the wavelength of the ultraviolet light is 360 nm, the concentration of the hexachlorobenzene in the hexachlorobenzene alcohol solution is 10<-14> - 10<-7> M, and the concentration of the hexachlorobenzene in the hexachlorobenzene alcohol solution is preferably to be 1*10<-9> - 8*10<-9> M. The method disclosed by the invention can quickly, sensitively and effectively detect the trace hexachlorobenzene and can be widely applied to the quick trace detection of the hexachlorobenzene in environment, medicine, food and biology samples.

The invention discloses bifunctional graphene quantum dots, and a preparation method and an application thereof, and belongs to the technical field of biosensors. The preparation method comprises thesteps: according to the molar ratio of citric acid to histidine to D-penicillamine of 1:0.1:0.01-1:1:1, preparing the dual-functionalized graphene quantum dots DPA-GQD-His by a hydrothermal method. The bifunctional graphene quantum dots provided by the invention can quantitatively detect one or more organophosphorus pesticides with high sensitivity and high selectivity, and the preparation methodis simple and easy to popularize.

The invention relates to an up-conversion luminescent nanometer material and a preparation method thereof, and a core-shell type fluorescent nanometer material integrating up-conversion luminescence and down-conversion long afterglow luminescence, and a preparation method thereof, wherein the inner core is an up-conversion luminescent nanometer material, the structural general formula is Ba(2-x)SrxY(1-y)LayF7:zRE<3+>, RE is one or a plurality of elements selected from Nd, Yb, Er, Ho, Tm and the like, x is greater than or equal to 0.1 and less than or equal to 1, y is greater than or equal to 0.01 and less than or equal to 0.3, z is greater than or equal to 0.001 and less than or equal to 0.1, the shell is a down-conversion long-afterglow luminescent nanometer material, the structural general formula is Ca (1-x)SrxAl(1-y)GayF5:zCr<3+>, x is greater than or equal to 0.01 and less than or equal to 0.5, y is greater than 0 and less than or equal to 0.7, and z is greater than or equal to 0.01 and less than or equal to 1. According to the invention, the up-conversion luminescent nanometer material can absorb 1.5 [mu]m near-infrared long-wave region energy and emit green light of about 540 nm, has a fluorescence lifetime of 500-600 [mu]m, and has characteristics of high fluorescence emission intensity and long light lifetime, wherein the excitation of the up-conversion luminescent nanometer material is in a human eye safety region; and the core-shell type fluorescent nanometer material integrating up-conversion luminescence and down-conversion long afterglow luminescence can absorb ultraviolet light and emit long-life afterglow, and can be excited by light with a wavelength of 1.5 [mu]m to emit up-conversion fluorescence with high intensity.

The invention discloses a non-contact ultra-low temperature sensing up-conversion nanoprobe and a preparation method and application thereof, and relates to a temperature sensing up-conversion nanoprobe and a preparation method and application thereof. The invention aims to solve the technical problems that the existing rare earth doped up-conversion fluorescent probe for temperature sensing is not suitable for being used in an ultralow temperature interval of less than 120K and is low in sensitivity. According to the probe, alpha-NaYF4 nanocrystalline serves as an inner core, NaYxF4: Yby <3+> / Tm1xy <3+> serves as a middle layer, and CaF2 or NaYF4 serves as an outer layer. The preparation method comprises the following steps: 1, preparing an alphaNaYF4 nanocrystalline core, 2, preparing anintermediate layer, and 3, preparing a CaF2 outer layer or a NaYF4 outer layer. When the sensor is used for temperature detection, a standard curve method is adopted to realize ultra-low temperaturehigh-sensitivity detection in a wide temperature interval of 10K-300K. The method can be used in the field of micro-nano scale non-contact optical temperature sensing.

The invention provides a rare earth composite fluorescent material using calcium phosphate as a matrix, and a preparation method thereof, wherein the composite fluorescent material is prepared by using rare earth ions as a light-emitting body, using alpha-thiophene formyl trifluoroacetone (TTA) and triphenyl phosphine oxide (TPPO) as organic ligands and using hydroxyapatite as a matrix under set conditions, and is characterized. According to the invention, the cost of the lighte-emitting material is reduced, and the prepared material has characteristics of long service life, high quantum yield, high fluorescence intensity, good fluorescence property, environmental protection and high efficiency.

The invention provides a binuclear double-ligand rare earth composite fluorescent material and a preparation method thereof. Rare earth europium ions and dysprosium ions, which are used as luminous bodies, react with acetylacetone and phenanthroline which are used as organic ligands under preset conditions to obtain the rare earth complex composite fluorescent material, and the obtained compositefluorescent material is characterized. The cost of the composite fluorescent material is reduced, and the prepared composite fluorescent material has a high fluorescence intensity and a good fluorescence performance.

In one embodiment, the invention discloses a tetrathiomolybdate radical / 1-octane sulfonate radical / LEuH complex, of which the chemical formula is Eu(OH)<2.41>(C8H17O3S)<x>(MoS4)<y>(NO3)<0.02>.<z>H2O. When the complex is dispersed in a stripping solvent composed of water and formamide to form a colloidal nano-sheet suspension liquid, the fluorescent emission intensity of the suspension liquid is significantly higher than that of a colloidal nano-sheet suspension liquid that is formed by dispersing a 1-octane sulfonate radical / LEuH complex in the same stripping solvent. In addition, by using water to replacing a part of formamide in the stripping solvent, the complex is more environment-friendly and has a better application prospect.

The invention discloses N, S-doped carbon quantum dots based on a choline ionic liquid and a preparation method thereof. A choline ionic liquid and a thiobetaine compound are mainly used as raw materials, carbon quantum dots are rapidly prepared by adopting a high-temperature cracking and chemical oxidation method, and the high-purity N, S-doped carbon quantum dots can be obtained after ultrasonic treatment, centrifugation, filtration, dialysis and freeze drying. The preparation method disclosed by the invention is simple and rapid, the raw materials are not easy to volatilize and environment-friendly, and the prepared carbon quantum dots have the advantages of uniform particle size distribution, high fluorescence intensity and good stability and have a good development prospect in rapid analysis and detection.

The invention discloses a light-operated dual-channel fluorescent dye and a preparation method and application thereof, and belongs to the technical field of organic optical functional materials. Thestructural formula of the light-operated dual-channel fluorescent dye is shown as a formula (I), molecules of the new compound obtained by the invention have a 1, 8-naphthalimide skeleton capable of emitting green fluorescence and two spiropyrane units capable of emitting red fluorescence after illumination so that the fluorescent dye is enabled to have obvious photochromic and light-regulated double-color fluorescence properties, and succinimide active ester groups enable the fluorescent dye to be stably bonded with amino groups, and thus the fluorescent dye can be used as a fluorescence labeling dye for double-channel co-localization of biomolecules.

The invention provides a rare earth europium composite fluorescent material using sodium acetate as a matrix, and a preparation method thereof, wherein the europium coordination compound composite fluorescent material is prepared by using europium ions as a luminous body, using triphenyl phosphine oxide (TPPO) and 2-thenoyltrifluoroacetone (TTA) as organic ligands and using sodium acetate as a matrix through a reaction under set conditions, and is characterized. According to the invention, the cost of the luminescent material is reduced, and the prepared material is long in service life, highin quantum yield, high in fluorescence intensity and good in fluorescence performance.

The invention provides a double-ligand rare earth composite fluorescent material and a preparation method thereof, wherein a terbium double-ligand rare earth cooperation compound is prepared by changing the ratio of a first ligand acetylacetone to a second ligand 1,10-phenanthroline, and is tested or characterized, wherein the fluorescence emission intensity can reach 1149948 CPS, and the quantumyield can reach 24.98%. The method has a certain guiding significance in the later selection of organic ligands beneficial to Tb<3+> characteristic emission and synthesis of photoluminescence and electroluminescence materials with excellent performances.

The invention discloses a fluorescent probe for detecting viscosity. Its structural formula is as follows: it has long-wave emission performance and large Stokes shift characteristics, so that the overlap between absorption and emission spectra is small, and the fluorescence efficiency caused by energy transfer can be avoided. Reduce and improve detection sensitivity; it can have a strong penetration depth in the process of imaging biological systems, and can effectively eliminate the interference of cell autofluorescence, low toxicity to cells, and has broad application prospects in the field of biomolecular detection . The invention also provides a preparation method and application of a fluorescent probe for detecting viscosity, and the fluorescent probe for detecting viscosity can be used for viscosity measurement in a solution system or a biological system.

The invention provides a rare earth composite fluorescent material taking carbonate as a matrix and a preparation method of the rare earth composite fluorescent material. According to the preparationmethod, europium ions are used as a luminous body; triphenyl phosphine oxide (TPPO) and 2-thiophenyltrifluoroacetone (TTA) are taken as organic ligands; calcium carbonate is taken as a matrix; an europium complex composite fluorescent material is prepared under set conditions, and the obtained composite fluorescent material is characterized. The cost of the fluorescent material is reduced, and theprepared material is long in service life, high in quantum yield, high in fluorescence intensity and good in fluorescence performance.