58results about How to "Obvious red shift" patented technology

The invention provides a method for preparing a nitrogen-doped titanium dioxide (TiO2) photocatalytic film, which comprises: firstly, performing nitriding treatment on a metal titanium or titanium alloy surface by using a ion nitriding process; and secondly, growing a TiO2 thin film in situ on the metal titanium or titanium alloy substrate obtained after the nitriding treatment by using a microarc oxidation technique. The method is used in the field of photocatalytic purification. Compared with a TiO2 thin film which is not doped with nitrogen, the nitrogen doped TiO2 photocatalytic film prepared by the method has the advantages that: the ultraviolet light and visible light absorption efficiency is improved obviously; the intensity of light generated current is improved obviously; and the organic material degradation efficiency is improved obviously.

The invention discloses a rare-earth nanometer metasilicate red fluorophor and the method for preparation. It contains the following setups: dissolving sensitizer activator substrate yttrium oxide in norbiline (or azotic acid), pressure-reduced distilling to eliminate water and excess acid, adding alcohol to prepare clear and transparent solution, and adding substrate silicon material to prepare transparent sol, pressure-reduced distilling to eliminate alcohol and acquiring powder solid, and adglutinating in 550-750 Deg. C by 2-4 hours to prepare the product. It prepares rare-earth nanometer red fluorescent powder in a low temperature (600 Deg. C) and a short time (3 hours), the average grain diameter being about 60-80 nm, the luminous intensity strong, chemical and optical property stable, the material easily obtained and cheap. Chemical expression formula of the rare-earth nanometer red fluorescent powder is as following: (YxSiy0z: Euj, Mn.

The invention discloses a fluorescence probe based on 1, 3, 4-oxadiazole derivative, and a synthetic method and applications thereof. Chemical formula of the fluorescence probe is represented in the invention. The synthetic method comprises following steps: N-[2-(5-phenyl-1, 3, 4-oxadiazole-2-yl)phenyl]-2-chloroacetamide, di-(pyridylmethylene)amine, N, N-diisopropylethylamine and potassium iodide are added into acetonitrile so as to obtain a mixture; the mixture is stirred, and is subjected to heating reflux under protection of nitrogen; solvent removing is realized via reduced pressure distillation, and obtained residues are subjected to column chromatography for separation so as to obtain the fluorescence probe N-[2-(5-phenyl-1, 3, 4-oxadiazole-2-yl)phenyl]-2-di(2-pyridylmethylene) acetamide. The raw materials are easily available; the synthetic method is simple; product separation and purification processes are easy; and the fluorescence probe possesses excellent water solubility, can be used for Zn<2+> monitoring analysis and tracer analysis in water environmental systems and biological cell systems, and possesses excellent sensitivity and relatively strong anti-interference capability on detection of Zn<2+>.

The invention discloses a triphenylamine-BODIPY derivative organic dye and a preparation method thereof. The triphenylamine-BODIPY derivative organic dye is prepared by that a triphenylamine-aldehyde compound is in reaction with pyrrole under the catalytic action of a catalyst, so as to synthetize dipyrromethane, and then a triphenylamine-BODIPY derivative is obtained through further oxidation and fluorine boronizing, and the general formula is shown in a structural formula I. The stokes displacement value of the triphenylamine-BODIPY derivative can reach 180 to 238 nm, and the fluorescence emission peak thereof locates in the near infrared region of 700 to 800 nm. The synthetic method of the compound is simple, the reaction is easy to control, the yield is high, common applicability is achieved, so that the BODIPY dye can be composited efficiently, and can be widely applied to the field of bioscience, analytic chemistry, environmental energy science and the like, and is particularly used as a near-infrared fluorescent dye and an organic solar cell material (refer to the description).

The invention relates to a photonic crystal material with humidity response allochroic characteristic and a preparing method thereof, and belongs to the field of material science. The preparing method includes the steps that a biological material of a photon structure serves as a biological template and is soaked in a precursor solution containing monomers, an initiator and a crosslinking agent, after diffusive equilibrium is reached, the template is taken out and heated to be subjected to an in-situ polymerization reaction, by means of the chemical bond connection function of the crosslinking agent, the surface of the template is evenly covered with a polymer, the own special hierarchical photon structure is reserved, and the obtained composite material has the obvious humidity response allochroic characteristic. Compared with the prior art, the responsiveness photonic crystal material is of the special hierarchical structure, has excellent response characteristic in the humidity response aspect and has potential application prospects in the field of chemical sensing.

The invention discloses a Cr<3+>-doped germanium-containing garnet phase broadband near-infrared fluorescent powder and a preparation method thereof, and belongs to the technical field of near-infrared luminescence. The germanium-containing garnet phase fluorescent powder is prepared by a high-temperature solid-phase method, and the preparation method comprises the following steps: grinding and uniformly mixing solid powder raw materials, calcining at 1200-1500 DEG C for 1-3 times, and finally grinding to obtain a final product. On the basis of a garnet structure with stable chemical properties and high luminous efficiency, the garnet phase structure fluorescent powder containing elements such as germanium, zinc, magnesium, calcium, strontium and the like is constructed in a weak crystal field environment, so that a Cr<3+> emission peak is red-shifted to a near-infrared region. The obtained garnet fluorescent powder realizes red shift of a Cr<3+> emission peak, has excellent propertiesof near-infrared broadband luminescence, wide emission range (650-850 nm), capability of being excited by blue light, high emission efficiency and the like, and is low in raw material cost, simple and convenient in operation method and capable of being produced on a large scale.

The invention discloses a dinuclear ring metal platinum (II) complex near-infrared electrophosphorescent material containing different conjugated bridges, and application of the electrophosphorescent material to an organic electroluminescent diode. The dinuclear ring metal platinum complex near-infrared electrophosphorescent material uses different conjugated rigid structures (benzene, 1,4-difluorobenzene, carbazole, fluorene and pyrene) as luminous kernel donor (D) units, and uses nitrogen-containing dentate conjugate ligands (isoquinoline, anthraquinoline and phenanthridine) as receptor (A) units for building the ring metal platinum complex near-infrared electrophosphorescent material using A-D-A structure as a main ligand, using 2,2,6,6-tetramethyl-3,5-heptadione as an auxiliary ligand and using platinum ions. The organic electrophosphorescent luminous device is prepared by using the near-infrared electrophosphorescent material as a luminous layer doping agent and using m-MTDATA:CBP as a body material. The device is a near-infrared electrophosphorescent luminous device with the maximum emitting peak being 709nm, the outer quantum efficiency being 3.97 percent and the maximum radiation degree being 2354nW.Sr<-1>.cm<-2>.

The invention relates to a Ce-doped water-soluble CdTe quantum dot synthetic method, which selects soluble cadmium salt as a cadmium source, tellurium dioxide as a tellurium source and mercaptoacetic acid as a stabilizing agent, and the Ce-doped water-soluble CdTe quantum dot is synthesized in a water phase system. The synthetic method has the advantages of simple and safe process. Compared with a traditional water phase synthesis approach, in the invention, preparation of a NaHTe precursor is not required, no H2Te toxic gas is discharged in a whole synthesis process, and the synthesis method has the characteristics of mild synthesis condition, easy control, simpleness, rapidity and environmental protection. maximum fluorescence emission wavelength of CdTe: Ce quantum dot enables obvious bathochromic shift, the fluorescence emission peak scope of the rare earth Ce-doped water-soluble CdTe quantum dot is 540-570nm, and the particle size is 3-5nm.

The invention discloses a method for preparing a carbon-doped TiO2 film by using a two-step method. The method comprises the following steps: (1) a TiO2 film is prepared by adopting a magnetron sputtering method; processed glass, silicon sheet and titanium sheet substrates are put in place; a TiO2 ceramic target serves as a sputtering target; a background is kept in 2*10-3 Pa order of magnitude in vacuum; 99.999% of argon and compensate oxygen are charged; the sputtering power is 300 W; the sputtering time is 30 minutes; and the temperature is kept for 2 hours in the air of 500 DEG C, and is naturally reduced; and (2) C is injected in the TiO2 film by using an ion injecting method; samples are put in an ion injecting chamber; CH4 gas is charged; the pressure is 1 Pa; the radio-frequency power is 40 W; the voltage is respectively 8, 10, 12, 14 and 16 kV; and the frequency is 50 Hz. The injecting time of each sample is 30 minutes. The C-TiO2 film prepared by the method has excellent light degradation effect.

The invention discloses meso-triphenylamine-substituted 3,5-aryl-modified boron dipyrromethene fluorophore derivatives (BODIPY) and a preparation method thereof. The meso-triphenylamine-substituted 3,5-aryl-modified boron dipyrromethene fluorophore derivative has a structure shown in a general formula I. The boron dipyrromethene fluorophore derivatives have an obvious red-shift phenomenon in comparison with ultraviolet absorption of BODIPY matrix; a fluorescence emission peak of the derivatives is close to a near-infrared region; and the synthesis method is simple, easy to control, and relatively high in yield, and has universality, so that the BODIPY dye can be efficiently synthesized and widely applied to the fields such as life science, analytical chemistry and environmental energy science, and especially can be applied to organic solar cells.

The invention provides an In2S3/MIL-53(Fe) efficient photocatalytic composite material, a preparation method and application. The mass ratio of In2S3 to MIL-53(Fe) is (10-30):1. The preparation methodcomprises the following steps: step 1, mixing InNO3 hydrated with 4.5H2O with MIL-53(Fe), and adding the mixture into water; step 2, dissolving L-cysteine in the same amount of water as that in the step 1; step 3, dropwise adding the solution obtained in the step 2 into the mixed solution obtained in the step 1 under a stirring condition, conducting stirring at room temperature, transferring a formed mixture into a high-pressure reaction kettle with a polytetrafluoroethylene lining, and carrying out sealed reaction; and step 4, naturally cooling the reacted mixed solution obtained after the reaction in the step 3 to room temperature, repeatedly conducting washing with water and absolute ethyl alcohol to remove impurities from the product, and conducting drying to obtain the In2S3/MIL-53(Fe) high-efficiency photocatalytic composite material. According to the efficient photocatalytic composite material disclosed by the invention, In2S3 is introduced, so that the diameter of an MIL-53(Fe) microrod is increased, the surface is rougher, more active sites can be provided, and the photocatalytic activity is favorably improved.

The invention relates to a Ge-Sb micropore sulfide with the ion exchange performance, a preparation method and the usage thereof. The sulfide has the chemical formula of (Me2 NH2)2 Sb2 GeS6 and the molecular weight of 600.64, belonging to tetragonal crystal system; and the space group is P4<1> 2<1>2, and the unit cell parameters comprise: a= b= 10.988 (3), c=13.811 (5)*, alpha=90 degrees, beta=90degrees, gamma=90 degrees, V=1667.6 (9) *<3>, and z=4. The material is synthesized by a solvent thermal method. The Ge-Sb micropore sulfide has excellent ion exchange performance for ions such as Cs<+>, Rb<+>, K<+> and Na<+> in water solution, and has strong ion exchange capability and high selectivity especially for the Cs<+>. The invention has important significance for removing radioactive elements in nuclear waste liquid and develops a new ion exchanger for treating the nuclear waste liquid.

The invention discloses a self-assembly substance based on a brush-like block polymer and a synthesis method and application thereof. The method for synthesizing the self-assembly substance comprisesthe following steps: uniformly dispersing the brush-like block copolymer PNBPM-b-PNDM in tetrahydrofuran, coating the mixed solution on a glass slide, and performing solvent evaporation at room temperature to obtain a polymer film. The self-assembly substance makes photonic crystal materials can be applied to light sensors, light valves, pigments, dyes and other aspects, and has great practical value.

The invention relates to a rare-earth-based light absorption material and a preparation method and application thereof. The rare-earth-based light absorption material is a lanthanum doped cerium oxidematerial and can absorb blue light and ultraviolet light in visible light, and the absorption threshold of the rare-earth-based light absorption material is 490 nanometers. The preparation method issimple, practicable, low in cost and capable of achieving large-scale production. The rare-earth-based light absorption material has the advantages that the rare-earth-based light absorption materialcan absorb electromagnetic waves of 200-490 nanometers, the powered material can effectively absorb the blue light and ultraviolet light in the visible light, and the material can be used as the absorbent of blue light and ultraviolet light to be applied to coating, skincare products and the manufacturing field of products such as screens and glass.

The invention discloses a thiophene-containing conjugate organo-boron polymer and a preparation method therefor. The target compound is obtained through subjecting a 2,5-diboro-1,4-phenylacetylene unit and a 2,5-thiophene diiodide unit, which serve as raw materials, to Sonogashira coupling in the presence of tetra(triphenylphosphine)palladium and cuprous iodide in a manner of taking tetrahydrofuran as a solvent and taking diisopropylamine as alkali. The invention belongs to the technical field of functional organic semiconductor materials, particularly unique properties of the thiophene-containing conjugate organo-boron polymer are decided by electron deficiency of boron and empty p-orbit, a boron monomer has strong bluish green light emission in a solution, and strong yellow light emission is obtained in the solution through being coupled to thiophene. The thiophene-containing conjugate poly-boron organic compound synthesized by the method can be applied to luminescent materials, thereaction conditions are mild, the process is simple in operation, short in production cycle and low in cost and is environmentally friendly, and the product has relatively high stability in air.

The present invention discloses a dual-core ionic iridium coordination compound, which is a novel organic light-emitting material concurrently having pressing discoloration and aggregation inducing, wherein the molecular formula is C54H34F20Ir2N12P2, the relative molecular mass is 1678.14 g/mol, and the coordination compound melting point is 315 DEG C. The preparation method comprises: adding 2-fluorophenyl pyrazole dichlorendic and a ligand bpba to a round bottom flask in a mixing manner according to a ratio of 1:(1.0-1.5), adding equal amounts of methanol and dichloromethane as a solvent to the flask, carrying out dark stirring reflux for 4 h under the protection of nitrogen gas at a temperature of 78 DEG C, cooling to a room temperature after completing the reaction, adding potassium hexafluorophosphate, stirring for 1 h, and filtering to obtain orange solid powder [(2Fppz)2Ir-(bpba)-Ir(2Fppz)2]2PF6. The dual-core ionic iridium coordination compound of the present invention can be used in organic gas sensors.