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 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 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 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 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.

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 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.