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

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 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 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 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 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 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 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 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.