16 results about "Bathochromic shift" patented technology

The invention belongs to the field of organic photoelectric materials, and relates to a cyanoindanone-modified boron-aza polycyclic aromatic hydrocarbon, and a preparation method and application thereof, and the cyanoindanone-modified boron-aza polycyclic aromatic hydrocarbon has a structure as shown in a general formula I and a general formula II. The cyanoindanone-modified boron-nitrogen heterocyclic polycyclic aromatic hydrocarbon provided by the invention shows the properties of wide spectrum and strong absorption, and meanwhile, the boron-nitrogen compound has a red-shifted absorption edge which can reach 815 nm at most.

The application discloses a high-conjugated photosensitizer with high ROS generation capacity and a preparation method thereof. The photosensitizer is prepared from halogenated BOPYIN as raw material, and is coupled with 4-diphenylaminophenylboronic acid under the catalysis of tetrakis(triphenylphosphine)palladium(0) and K2CO3 under the protection of N2. The synthesis method is simple, separation and purification are convenient, and the yield is high. An aromatic ring is introduced on the parent structure, so that the absorption spectrum is red-shifted and has strong stability. The compound has long-wavelength absorption characteristics due to the extended conjugated structure, and the optical characteristics enable the compound to be effectively applied in the field of photodynamic therapy.

The invention discloses a Zr-MOFs piezochromic material based on topological regulation and a preparation method and application thereof, and belongs to the technical field of preparation of high-pressure fluorescent materials. Specifically, the invention relates to two MOFs materials with different topological structures and piezochromism performance. The two materials are PCN-608 of a csq topological structure with a one-dimensional pore channel and PCN-606 of an scu topological structure with a rhombic pore channel. Wherein the metal is zirconium, and the ligands are tetracarboxylic acid ligands containing biphenyl groups. And pressurizing the material to about 11 GPa by using a diamond anvil cell to obtain PCN-608 with enhanced fluorescence and red shift of emission wavelength and PCN-606 with attenuated fluorescence and red shift but higher pressure sensitivity. The preparation method disclosed by the invention is simple and convenient in route process, mild in reaction condition and high in repeatability. And the selection range of the prepared fluorescence enhanced material is greatly expanded.

The invention is applicable to the technical field of semiconductors, and provides a full-spectrum LED epitaxial growth method capable of reducing wavelength red shift, a metal organic chemical vapor deposition reaction cavity is adopted for epitaxial material growth, a plurality of V-shaped pits are formed in a light emitting layer, and a Fe-doped GaN layer, a Fe and C co-doped GaN layer and a BGaN layer are introduced into the V-shaped pits, so that the wavelength red shift of the LED is reduced. More holes at room temperature reach the long-wave quantum well on the N side, and the number difference of holes reaching the long-wave quantum well on the N side under the room temperature and thermal state conditions is reduced, so that the dominant wavelength difference value under the room temperature and thermal state conditions is reduced, the wavelength red shift is reduced, the light output power is improved, and the brightness is improved. The technical problems that the dominant wavelength difference value of a full-spectrum LED is large at the room temperature and the thermal working temperature, and the wavelength generates red shift are effectively solved.

The application relates to the technical field of thermochromic film, in particular to an Au-NPs / HfO2 / VO2 composite film and a preparation method and application thereof. The Au-NPs / HfO2 / VO2 composite film comprises, from bottom to top, an Au-NPs local surface plasmon control layer (3), an HfO2 covering layer (2) and a VO2 thermochromic functional film layer (1); and the Au-NPs local surface plasmon control layer (3) is combined with a substrate. In the application, an Au film is sputtered on a glass substrate, and Au-NPs are formed by annealing; the introduction of the HfO2 covering layer provides a stable medium environment for the Au-NPs, avoids the red shift or blue shift of the absorption peak position of the Au-NPs due to temperature change, and further influences the solar energy regulation efficiency of the composite film, so that the composite film achieves the balance between the optical performance and the color conforming to the architectural aesthetics.

The invention belongs to the field of luminescent materials, and provides a broadband tunable high-performance near-infrared luminescent material and a preparation method thereof, the chemical formula is Y2SrGa4SiO12: xCr < 3 + >, and x is more than or equal to 0.005 and less than or equal to 0.09. Y2SrGa4SiO12 is selected as a matrix, Cr < 3 + > is selected as an active ion, a traditional high-temperature solid-phase method is adopted for sintering, the near-infrared emission material with excellent performance is prepared, and the emission range covers 600-1100 nm and FWHM-171 nm. Along with the increase of the Cr < 3 + > doping concentration, the emission peak is gradually subjected to red shift and broadening, the spectrum is adjustable, and the optimal sample can still keep 81% of room-temperature emission intensity and 96.6% of excellent internal quantum efficiency under the high-temperature condition of 423 K.

The application discloses a method and device for improving the spontaneous emission time contrast of femtosecond laser pulses. The device comprises a titanium sapphire femtosecond laser oscillator, a laser pump source, a stretcher, a regenerative amplifier, an electro-optical switch, a compressor and the like. The low-energy pulses output by the femtosecond laser oscillator are time-domain stretched by the stretcher, and then are sent into the regenerative amplifier for amplification. At this time, the transmittance of laser pulses of different wavelengths in the ring cavity is adjusted by adjusting the incident angle of the laser into the spectrum shaping filter in the ring cavity, so as to suppress the spontaneous emission in the cavity and improve the spontaneous emission time contrast of the amplified light. Subsequently, the electro-optical switch is controlled to make the amplified light enter the pulse compressor, and finally the femtosecond laser pulses with high energy and high time contrast are generated. The application improves the spontaneous emission time contrast of femtosecond laser pulses by spectrum shaping filtering in the ring cavity of the amplifier, and can also effectively suppress the spectral red shift and gain narrowing of the amplified light, and output the amplified light with a wide spectrum.

The invention provides a pyrazine-benzothiophene / indole-containing compound, a preparation method thereof and an organic electroluminescent device, and relates to the technical field of electroluminescent materials. According to the pyrazine-benzothiophene / indole-containing compound, a pyrazine-benzothiophene / indole unit is embedded on the basis of a core of a traditional multiple resonance type thermal activation delayed fluorescent material, spectrum red shift is promoted and the luminous efficiency is improved while narrow-band luminescence is realized, and the pyrazine-benzothiophene / indole-containing compound has an important synergistic effect on manufacturing of an efficient narrow-band red light OLED (Organic Light Emitting Diode) device; according to the method, quinoxaline containing pyrazine-benzothiophene / indole and BBr3 are subjected to a coupling reaction through a one-pot method, the compound containing pyrazine-benzothiophene / indole is obtained, the synthetic route is simple, and large-scale industrial production is facilitated; according to the organic light-emitting device with a light-emitting layer formed by the pyrazine-benzothiophene / indole-containing compound, the external quantum efficiency of the organic light-emitting device is remarkably improved on the premise of effectively controlling the full width at half maximum of the organic light-emitting device.

The invention discloses a multichannel fluorescent probe compound based on pyrone functionalization. The compound is synthesized through the steps of diazotization, cyclization, condensation and the like of raw materials such as paranitroaniline, furaldehyde, 2-hydroxy-1-naphthaldehyde and the like. Q3 has high selective recognition capability on Cu, and in a DMSO / HEPES buffer solution, Cu can enable fluorescence of a probe solution to be quenched, ultraviolet absorption to be subjected to red shift and the color to be changed from light green to yellow, so that fluorescence and naked eye detection are realized; the formed Q3-Cu complex can specifically recognize CN, so that fluorescence recovery, ultraviolet absorption blue shift and turning of color back to light green are caused, and Cu and CN can be continuously detected. The probe can be used for Cu / CN fluorescence imaging in living cells, detection of Cu residues in traditional Chinese medicinal materials and preparation of Cu / CN detection test paper, and has the characteristics of high sensitivity, strong anti-interference performance, quick response and the like.

A porous hollow spherical photonic crystal sensor for detecting xylene gas and a method thereof, comprising synthesizing PS@SiO2 core-shell colloids, assembling into spherical photonic crystals by microfluidics, calcining to remove the polystyrene inner core to form a hollow SiO2 structure, and introducing a porous structure by controllable chemical etching. Subsequently, functionalization is performed by using P(VBC-co-MMA) to obtain a porous hollow spherical photonic crystal sensor, which is endowed with strong molecular affinity for xylene, and selective gas adsorption of the porous photonic crystal is realized. Benefiting from the super-symmetrical spherical structure, the obtained photonic crystal sensor exhibits an inherent angle-independent optical response, overcoming the limitation of angle dependence of thin film photonic crystal sensors. Exposure to xylene gas shows a significant reversible red shift of the optical stop band and a clear color change, which is due to the increase of the effective refractive index caused by vapor diffusion and adsorption. By monitoring the movement of the optical stop band in air and saturated xylene, visual detection of xylene gas can be realized.

The invention discloses an A beta plaque specific response type near-infrared fluorescent probe as well as a preparation method and application thereof. The near-infrared fluorescent probe disclosed by the invention has red-shift fluorescence emission, has a remarkable fluorescence signal in a near-infrared second region, shows relatively high specificity and sensitivity on A beta plaque, and can be used for carrying out early-stage, accurate, high-resolution and long-term nondestructive monitoring on the Alzheimer's disease at a living body level.

The application discloses a heterocyclic compound and application thereof in a nano-protein fluorescent probe, and the structure of the probe is as shown in the following figure: wherein the substituent R is selected from any one of N,N-dimethylaminophenyl and p-cyanophenyl. The probe is prepared from pyrrozine fused BOPYIN as raw material, coupled with phenylboronic acid through tetra-triphenylphosphine palladium catalysis, and has the advantages of simple synthesis method, convenient separation and purification and high yield. The aromatic ring is introduced on the parent structure, so that the absorption spectrum is red-shifted and has strong stability, and the probe can be used for glioma tumor targeting color development.

New phosphoramidite Cy5 derivatives can be used in automated DNA synthesis, allowing the labeling of DNA sequences with a wider array of chromophores than are presently commercially available. In addition to varying dye hydrophobicity / hydrophilicity, the 5,5′-substituents (including hexyloxy, triethyleneglycol monomethyl ether, tert-butyl, and chloro groups) can modulate electron donating / withdrawing character while also tuning resulting absorption and emission properties. Modification of the Cy5 periphery enables the tuning of photophysical properties, such as absorption and emission maxima, fluorescence quantum yield, and fluorescence lifetime.

The invention discloses a fluorescent probe based on dual-emission carbon quantum dots and application of the fluorescent probe in methanol detection, and belongs to the technical field of fluorescent probes. According to the preparation method, p-phenylenediamine (p-PD) is only used as a single precursor, the carbon quantum dots (p-PD CDs) with blue light and red light dual-emission characteristics are successfully prepared by regulating and controlling a solvent environment and adopting a two-step synthesis strategy, and the carbon quantum dots can be stably stored for a long time. The carbon quantum dot can quickly, simply, conveniently and efficiently identify and detect the methanol concentration in a methanol-ethanol system, by increasing the methanol content, the blue emission peak of the carbon quantum dot is subjected to red shift, the fluorescence intensity is gradually reduced, and the fluorescence intensity of the red emission peak is slightly reduced. The result shows that when the concentration of methanol is 0-60% and 70%-100%, the fluorescence intensity ratio of the carbon quantum dots and the concentration of methanol have a good linear relationship. Meanwhile, the carbon quantum dots can also be used for detecting low-concentration methanol in ethanol, and the detection limit is 0.38%.

The application discloses an A beta plaque specific response type near-infrared fluorescent probe and a preparation method and application thereof. The near-infrared fluorescent probe has a red-shifted fluorescent emission, has a significant fluorescent signal in a near-infrared two region, and has higher specificity and sensitivity to A beta plaques, so that the Alzheimer disease can be monitored in a living body level in an early stage, high resolution and long time course and in a nondestructive manner.

The present application relates to a kind of visual analysis system and method for astronomical spectral type inspection, belong to the field of visualization and man-machine interaction, the system includes: data preprocessing module is used to the reference spectrum and the pre-processing of the spectrum to be checked, completes the normalization of spectrum, spectrum feature detection and spectrum characterization;Selection module is used to help user select a spectrum to be checked, and determine possible red shift and the important spectral line under the red shift;Checking module is used to help user determine the red shift and type of the spectrum to be checked, checking module includes adjustment submodule, recommendation submodule and verification submodule, respectively for adjusting the red shift of the spectrum to be checked, recommend suitable spectral line to user and evaluate the inspection result;Generalization module is used to help user obtain other spectrum similar to the checked spectrum by searching.The system and method provided by the present application can significantly improve the classification efficiency under the premise of ensuring the accuracy of expert spectrum classification.