107results about How to "Strong fluorescence emission" patented technology

The invention relates to an amphiphilic aza-BODIPY fluorescent dye and a preparation method thereof. The preparation method comprises the following steps: reacting p-propynyloxy acetophenone with dodecyloxy phenylacetaldehyde to obtain chalcone; performing nitromethane nitration to obtain 4'-propynyloxy-4-dodecyloxy-2-nitromethylene-chalcone; carrying out coupling under an ammonium acetate condition, reacting the coupling product with boron trifluoride-ether to obtain an aza-BODIPY structure; and introducing different hydrophilic groups into the opposite alkynes of benzene with substituted 3rd and 5th positions of the parent structure of aza-BODIPY through click reactions so as to obtain the amphiphilic molecule. The provided synthesis method has the advantages of few steps, simple conditions, and high yield. Prominent aggregation phenomenon of amphiphilic BODIPY dye in water can be observed, the UV absorption of the dye is near 800 nm, the UV absorption peak is sharp, and the strength is extremely high.

The invention discloses a piezochromic material, a preparation method and applications thereof. The preparation method comprises the following steps: adding 3 grams of carbazole, 3.3 grams of p-bromobenzaldehyde, 3.7 grams of potassium carbonate, 0.33 gram of 18-crown-6, 0.4 gram of cuprous iodide, and 18 mL of o-dichlorobenzene into a round-bottom flask (100 mL); vacuumizing under freezing, introducing nitrogen into the round-bottom flask for three times, stirring at a temperature of 180 DEG C, carrying out reflux for 48 hours; repeatedly washing the reaction system by a hydrochloric acid solution (5%), using dichloromethane to carry out extraction for three times, using waterless magnesium sulfate to dry the product, performing rotary evaporation to remove the solvent, and finally carrying out column chromatography isolation to obtain 3.9 grams of pure product, wherein the yield is 80%.

The invention belongs to the technical field of analysis and detection, and discloses a fluorescent probe and a preparation method thereof, and applications of the fluorescent probe in detection of tyrosinase, wherein the system of the fluorescent probe is named 3,3'-({5-[3-(4-hydroxyphenyl)ureido]-5H-benzo[a]phenoxazin-9-yl}azanediyl)methyl dipropionate, and the structure formula is represented by a formula (I). According to the present invention, the fluorescent probe compound can be used for the qualitative and quantitative analysis of tyrosinase, and has advantages of good detection precision, good accuracy and good anti-interference property. The formula (I) is defined in the specification.

The invention discloses cyclic polymer and the preparation method thereof. The cyclic polymer is cyclic main chain phenylazo naphthalene polymer. Firstly, monomer EPNA is obtained through preparation, then thermocatalytic solid phase reaction is adopted for click reaction stepwise polymerization to the monomer EPNA, so as to obtain Alpha-azide group and Omega-alkynyl linear-PEPNA; and finally, ring closing reaction to linear-PEPNA is performed in extremely dilute solution through a nitrine / alkynyl CuAAC method, so as to obtain cyclic PEPNA. Compared with the linear polymer with the same molecular weight, the cyclic main chain phenylazo naphthalene polymer synthesized by using the method provided by the invention has the advantages of higher glass transition temperature (Tg), strong fluorescent emission, long fluorescence life time and deep groove depth of SRG (surface relief gratings).

The invention relates to carbazole benzaldehyde-p-phenylenediamine bi-schiff base and a preparation method thereof. Bi-schiff base with a conjugated structure is obtained by the condensation reaction of aldehyde group and primary amine by taking p-phenylenediamine, carbazole and p-fluorobenzaldehyde as raw materials. According to the process, the synthetic cost is low, the yield is high, the reaction condition is moderate, and the product is easy to purify. Therefore the compound has the conjugated and rigid plane structure, so that the strong fluorescence is shown, the fluorescent light of the Cu2+ compound has the strong enhancement action, so that the compound can be used as a Cu2+ fluorescence probe and is applied to the field of fluorescence probes.

The invention discloses a near-infrared region II fluorescent compound with an aggregation induced emission property, a preparation method, a nanoparticle micelle and an application of the nanoparticle micelle. The near-infrared region II aggregation induced emission fluorescent compound is an organic micromolecular compound, is large in Stokes shift, has strong fluorescence emission and can effectively overcome the defect of aggregation induced quenching of the traditional fluorescent dye. The fluorescent compound is entrapped by distearoyl phosphatidyl ethanolamine-polyethylene glycol to form the nano micelle; a prepared fluorescence probe has the advantages of good water solubility and biocompatibility, no toxicity, relatively high light stability, and very high biological imaging signal to noise ratio and sensitivity. The fluorescence probe can be used as a near-infrared region II report material for disease diagnosis, intraoperative navigation treatment, tissue and organ functionevaluation and the like, can play an important role in medical optical examination in the future and has very good application prospects.

The invention relates to carbazole benzaldehyde o-phenylenediamine bis-schiff base and a preparation method thereof. The bis-schiff base with a conjugated structure is obtained by using o-phenylenediamine, carbazole and p-fluorobenzaldehyde as raw materials through condensation reaction of aldehyde group and primary amine. The method is low in synthesis cost, high in yield and mild in reaction condition; and the bis-schiff base is easy to purify. The bis-schiff base has the conjugated and rigid plane structure and shows strong fluorescence emission property in a solution, and Cu<2+> has a strong enhancing effect on fluorescence of the bis-schiff base, so the bis-schiff base can be used as a Cu<2+> fluorescence probe and is applied in the field of fluorescence probes.

The invention discloses a near-infrared fluorescent probe for high-selectivity detecting of thiophenol and a synthesis method and application thereof, and belongs to the technical field of chemical analysis and detection. The near-infrared fluorescent probe is obtained by reaction between a dicyanoisophorone-julolidine large pi system and 2,4-dinitrofluorobenzene, and has the following structure (please see the specifications for the structure). Fluorophore of the probe is the dicyanoisophorone-julolidine large pi system, and a response group to thiophenol is 2,4-dinitrophenoxy. Molecules of the probe have high selectivity and sensitivity to thiophenol, the detection range is 1-60 [mu]mol.L<-1>, and the limit of detection is 0.13 [mu]mol.L<-1>. The probe can be used for detecting thiophenol in water bodies, soil and cells.

The invention discloses a near-infrared fluorescent probe for detecting thiophenol and a synthesis method and application thereof, and belongs to the technical field of chemical analysis and detection. The near-infrared fluorescent probe is obtained by reaction between a dicyano-substituted isophorone large pi system and 2,4-dinitrofluorobenzene, and has the following structure (being defined as in the specification). Fluorophore of the probe is the dicyano-substituted isophorone large pi system, and a response group to thiophenol is 2,4-dinitrophenoxy. Molecules of the probe have high selectivity and sensitivity to thiophenol, the detection range is 0.5-10 [mu]mol.L<-1>, and the limit of detection is 23 nmol.L<-1>. The probe can be used for detecting thiophenol in water bodies, soil and cells.

The invention belongs to the technical field of material preparation, and particularly relates to a method for preparing a single-layer two-dimensional transition metal sulfide material. An oxidized Mfoil is used as an M precursor for preparing a two-dimensional material by CVD (chemical vapor deposition), X powder serves as an X source, the single-layer two-dimensional material MX2 with good crystallinity is prepared by setting a high-temperature area and a low-temperature area for CVD and by the aid of specific heating and cooling procedures, and a new idea is provided for growth and preparation of later large-area two-dimensional materials.

The present invention discloses a rapid preparation method of an inorganic compound coated aqueous phase II-VI group quantum dot composite material. The rapid preparation method comprises: adopting cadmium chloride or zinc chloride as a cation source, adopting sulfur powder, tellurium powder or selenium powder as an anion source, adopting sodium borohydride as a reducing agent, adopting mercaptopropionic acid, thioglycolic acid or glutathione and other mercapto compounds as ligands, heating to a temperature of 90-100 DEG C, and refluxing for different times to obtain quantum dots with different emission wavelengths; and adding a sodium salt or potassium salt to the quantum dot solution, carrying out stirring dissolving, adding excessive methanol, ethanol, propanol or acetone and other polar organic solvents, precipitating, filtering, drying, and grinding to obtain the corresponding quantum dot / inorganic compound complex powder with characteristics of strong fluorescence emission and high stability, wherein the powder can be used in the field of solid luminescent materials. The method of the present invention has characteristics of simple operation, rapidness, high efficiency, and green environmental protection, and is suitable for mass production.

The invention provides a preparation method for of a metal-doped fluorescent carbon quantum dot. The preparation method comprises the following steps: 1) dissolving a metal porphyrin compound in tetrahydrofuran to obtain liquid A; 2) dissolving a polycarboxylic acid compound in water to obtain liquid B; 3) mixing the liquid A and the liquid B and carrying out ultrasonic dispersion to obtain mixedliquid C; 4) heating the mixed liquid C in oil bath, after the mixed liquid C is viscous, adding water to continue the reaction, and repeating the process for multiple times to obtain reaction liquidD; and 5) adding water to the reaction liquid D and adjusting the pH by using an alkaline reagent, dialyzing the supernatant of the reaction liquid D, collecting the aqueous solution obtained by dialysis, and lyophilizing the aqueous solution to obtain the metal doped fluorescent carbon quantum dot. According to the preparation method, the poorly water-soluble metal porphyrin compound is coated bythe water-soluble polycarboxylic acid compound under a hydrothermal condition, so that the metal doped fluorescent carbon quantum dot is high in metal doping rate and high yield, small in toxicity and wide in application range.

The invention relates to a graphene quantum dot-rare earth up-conversion nano composite material as well as a preparation method and application thereof. The preparation method of histidine-hexamethylenediamine functionalized graphene quantum dots comprises the following steps: uniformly mixing citric acid, histidine and hexamethylenediamine at a molar ratio of 1:0.6:0.1 to 1:1.2:0.5, fully dissolving in deionized water, heating the mixture at 150-200 DEG C for reaction for 0.5-4h to obtain the histidine-hexamethylenediamine functionalized graphene quantum dots, and then preparing a compositethough in-situ hydrothermal synthesis. The prepared composite material can be used for designing an up-conversion biosensing nano platform for detecting carcino-embryonic antigen CEA.

The invention provides a chromium-doped potassium scandium tungstate tunable laser crystal. 60-90at% of K2W2O7 serves as a fluxing agent, the cooling rate is 1-5DEG C / day, and the revolving speed is 5-30turns / minute. The Cr<3+>: KSc(WO4)3 crystal with high quality and bigger size grows. The crystal belongs to a trigonal system and has a space group structure. The crystal can serve as the tunable laser crystal of which the tunable range is 750-1200nm, and the solid crystal made of the crystal can be used for various fields, such as spectroscopy, biomedicine and military.

The invention provides a tetraphenylethylene blue-fluorescence organic compound and a preparation method for an organic electroluminescence device thereof. A structure of the tetraphenylethylene blue-fluorescence organic compound is as shown in formula (I): wherein Ar is a naphthyl. The compound is capable of enabling the naphthyl and a triphenylethylene group to be connected with anthracene, using the anthracene as a fundamental luminescence group, and using triphenylethylene and naphthalene as modification for transforming a structure or a group of the anthracene, wherein the triphenylethylene and the anthracene form a structure similar to tetraphenyl ethylene. Because the tetraphenyl ethylene structure can produce an aggregation-induced emission (AIE) effect, a phenomenon of exciton annihilation can be effectively inhibited, so a molecule has the stronger fluorescence emission in a high-concentration aggregation state than that in a low-concentration. In addition, because a relativemolecular weight of the compound is larger, an aromatic structure and an ethylene structure have a conjugate condition, the finally prepared compound is good in heat stability, and has the high luminance brightness, and the prepared device is good in performance.

The invention discloses a synthetic method of an amphiphilic block polymer with near infrared fluorescence characteristic, and a functional monomer VDHBI containing 2-benzimidazolyl-beta-naphthalene group is synthesized by a solid phase reaction of naphthoic acid and o-phenylenediamine; N-isopropyl acrylamide (NIPAM) and the VDHBI are respectively used as monomer, and alpha-2-cyanoprop-2-yl 1-dithionaphthalate (CPDN) is used as a RAFT reagent, and the homopolymer PNIPAM is obtained after RAFT polymerization; the PNIPAM is a macro-molecule RAFT reagent, and VDHBI is a second monomer for RAFT polymerization, and the amphiphilic block polymer PNIPAM-b-PVDHBI is synthesized. According to the invention scheme, an 'active' / controllable free radical polymerization method is provided for preparing the amphiphilic block polymer containing near infrared fluorescence characteristics with controllable molecular weight and narrow molecular weight distribution and delicate structure, and also a new method for synthesizing the amphiphilic block polymer containing the near infrared fluorescence characteristics with multiple stimulation responses.

The invention relates to a nitrogen heterocyclic carbene silver complex based on bispyrazole methyl phenoxy methylimidazole and a preparation method and application thereof. The preparation method of the nitrogen heterocyclic carbene silver complex is as follows: at room temperature in dark conditions, a bispyrazole methyl phenoxy methyl substituted imidazolium salt and silver oxide in the molar ratio of 1 to 0.7 are dissolved in an organic solvent for reaction for 24 hours, then filtered and concentrated to prepare the nitrogen heterocyclic carbene silver complex. The nitrogen heterocyclic carbene silver complex has strong capability of emission fluorescence and catalyzing of coupled reaction of acetylene, amine and aldehyde three components, and can be mainly used in fluorescent materials and organic catalysis technology field.

The invention discloses a fluorescent probe based on trans-cucurbit[7]uril, and a preparation method and an application thereof. The fluorescent probe includes a self-assembly complex with the iQ[7] and DASPM synthesis molar ratio of 1:1, and the self-assembly complex has the molecular formula of C58H61N30O14 and has the structural formula defined in the specification. The fluorescent probe has the characteristics of high-sensitivity and high-selectivity recognition of p-xylylenediamine molecules.

The invention discloses an up / down conversion dual-mode light-emitting nanocrystalline and a preparation method and application thereof, and relates to the technical field of nanocrystalline materials. According to the nanocrystal, rare earth chloride is used as a precursor, and monodisperse rare earth fluoride nanoparticles with small particle sizes are prepared as cores under the joint participation of sodium hydroxide and ammonium fluoride; an epitaxial growth method is used, oleic acid and octadecene are used as a mixed solvent, and the rare earth oleate precursor and sodium fluoride jointly act in a high-temperature solvent to realize coating of the shell rare earth fluoride nanocrystalline. The method is simple in synthetic route operation, uniform in product particle size distribution and high in purity, the nanocrystalline is endowed with stronger red and near-infrared two-region fluorescence by doping different rare earth elements and controlling the sizes of a core and a shell in a core-shell structure, and the nanocrystalline can be used as a potential optical imaging contrast agent due to near-infrared fluorescence, so that the contrast agent has a wide application prospect. Due to red light emission, the prepared nanocrystal can be used as a nano energy converter to be applied to light-triggered therapy.

The invention relates to a metal organic complex containing a thiophene functional group and a preparing method and application of the metal organic complex. According to the technical scheme, Cd(NO3)2.6H2O, a ligand 2,2'-bithiophene-5,5'-dicarboxylic acid(H2btdc), a solvent N,N-dimethyl formamide and ethyl alcohol are added into a high-temperature-resistant spiral opening glass bottle, and stirring is carried out at the room temperature; the container is sealed and then put into an oven, and heating is carried out for 1-2 days at the temperature of 75 DEG C; the container is slowly cooled to the room temperature, and yellow transparent bulk crystals are obtained; the mixture is washed with N,N-dimethyl formamide, filtered and dried, and the target product is obtained. The prepared metal organic complex containing the thiophene functional group shows a good fluorescence characteristic and can be used for efficiently and selectively recognizing heavy metal zinc ions.

The invention discloses a high-concentration erbium ion doped tellurium tungstate glass capable of emitting light at mid-infrared 2.7 microns. The glass comprises the following components by molar percent: 58-70% of TeO2, 15-25% of WO3, 0-15% of La2O3, 0-15% of LaF3 and 2-4% of Er2O3. The glass is prepared by adopting an electric furnace melting method of a corundum crucible and a silicon carbide rod. The glass is high in doping concentration of erbium ion, high in infrared transmittance near to the mid-infrared 2.7 microns and good in physicochemical properties; and the stability parameter delta T is not less than 180 DEG C. Strong mid-infrared 2.7 microns fluorescence is obtained under pumping of a laser diode with a wavelength of 980 nm; and the glass is suitable for preparation and application of erbium ion doped special glass and optical fiber materials capable of emitting light at mid-infrared 2.7 microns.

The invention provides double-phase organic fluorescent materials with relatively strong fluorescence in the solid state and the solution state and a preparation method and application thereof. Particularly, the invention provides arylpyrrole derivative fluorescent materials shown as a general formula (TPP-R) and having relatively strong solid-state and solution-state two-phase fluorescence emission: FORMULA, wherein R is an electron-withdrawing group, an aldehyde group, cyano or an ester group. The invention further provides a preparation method of the aryl-substituted pyrrole derivative fluorescent materials. The prepared fluorescent materials have relatively high fluorescence quantum efficiency and significant solvent effect in the solid state and the liquid state, and the medium-polarity electron-withdrawing enables one of the fluorescent materials to have light-emitting characteristics in different aggregation morphologies. The fluorescent materials with relatively strong light-emitting characteristics in the solid state and the solution state have a good application prospect in organic light-emitting diodes, chemical detection, biological detection and other aspects.

The invention belongs to the technical field of fluorescent nanometer materials, and specifically discloses a rapid large-scale preparation method of water-solubility fluorescent carbon quantum dots. The method comprises the following steps: taking polyhydroxy saccharides such as glucose as a carbon source, and adding hot oil for mechanical stirring to obtain a brown pasty substance; after cooling, adding deionized water for stirring and dissolving, separating an oil phase, and recycling a water phase to obtain the water-solubility carbon quantum dots. According to the method disclosed by the invention, the polyhydroxy saccharides are taken as a carbon source, and oil with high boiling point is adopted as a heating medium and can be recycled, so that the method is low in preparation cost, simple in operation and high in preparation speed, a high pressure condition is not needed, the requirement for equipment is relatively low, and the prepared carbon quantum dots are of excellent water solubility, so that the method can be used for preparing the water-solubility carbon quantum dots in large scale.

The invention belongs to the fields of light converting agents and light converting film. A down-conversion light converting agent is disclosed. The chemical composition of the down-conversion light converting agent is Sr<4-x>MgSi2O<9>:<x>Eu<2+>, wherein 0.01<=x<=0.2. A beneficial effect of the light converting agent is that (1) the light converting agent has good chemical stability, a high light conversion efficiency and long service lifetime and can be used for producing agricultural blue light converting film.

The invention relates to a carbon nanotube-CdTe / CdS nanocomposite and a preparation method thereof. The composite material is prepared by covalently loading CdTe / CdS core-shell quantum dots onto the surface of PEI-MWCNTs. The preparation method comprises the following steps of adding CdTe / CdS quantum dots with a core-shell structure and a crosslinking agent into double distilled water, carrying out ultrasonic treatment for 3 hours, then adding PEI-MWCNTs, carrying out ultrasonic reaction for 24 hours and dialyzing to obtain the carbon nanotube-CdTe / CdS nanocomposite MWCNTs-CdTe / CdS. MWCNTs-CdTe / CdS nanocomposite prepared by the method has a good dispersibility in the aqueous phase as well as a relatively high fluorescence intensity and fluorescence stability and can be used as the novel nanometer fluorescent probe in the fields of photoelectric and biological sensors, biological pharmacy and the like.

The invention relates to the technical field of luminous materials, in particular to a tetraphenylethylene-phenanthroimidazole derivative and a crystal, preparation method and application thereof. Thedisclosed tetraphenylethylene-phenanthroimidazole derivative has a structure represented by a formula (I), wherein R1 is selected from -OCH3,-O(CH2)3CH3 and -O(CH2)5CH3 or a strong electron donatinggroup, and n is 1-2. In the derivative, tetraphenylethylene and phenanthroimidazole are connected through a benzene ring, and since an AIE effect can be generated by an extremely twisted structure oftetraphenylethylene, an ACQ effect of a luminous material with high concentration can be weakened by introducing a TPE group; the phenomenon of exciton annihilation can be effectively inhibited, so that molecules achieve stronger fluorescence emission in a high concentration aggregation state in comparison with a low concentration aggregation state. Meanwhile, because the relative molecular weightof the compound is large, a large conjugated structure exists, and the stability is high. According to experimental data, the provided tetraphenylethylene-phenanthroimidazole derivative can cause anobvious AIE phenomenon and has high thermal stability and luminous intensity.

The invention relates to a composite coloring agent which comprises polymer substrates, surface active agents, a coumarin compound emitting blue light, a coumarin compound emitting green light and a light stabilizer. Meanwhile, the invention further relates to a preparation method of the composite coloring agent in a solvent-free condition. The composite coloring agent shows strong fluorescence emission, glossiness and sunlight fastness, and shows quite good light and heat stability.

The invention relates to the field of high-value conversion and utilization of biomass, particularly to application of a zirconium-doped niobium oxyphosphate catalyst in preparation of carbon quantumdots from lignin, a carbon quantum dot preparation method and carbon quantum dots. According to the application of the zirconium-doped niobium oxyphosphate catalyst in preparation of carbon quantum dots from lignin, the specific surface area of the zirconium-doped niobium oxyphosphate catalyst is 50-250 m<2> / g, and the surface strong acid amount is greater than 100 [mu]mol / g when the pyridine desorption temperature is greater than 400 DEG C. The zirconium-doped niobium oxyphosphate catalyst has high activity and is stable, and can well catalyze the conversion of lignin by being applied to thepreparation of carbon quantum dots from lignin without adding inorganic acid and alkali.

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.

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.