18results about How to "High fluorescence quantum yield" patented technology

The invention provides a surface-modified perovskite nanocrystal and a preparation method and application thereof, and the surface-modified perovskite nanocrystal comprises: a perovskite nanocrystal having a chemical composition of ABX3; wherein A is selected from at least one of Cs < + >, CH3NH3 < + > and HC (NH2) 2 < + >; b is selected from at least one of Pb < 2 + >, Sn < 2 + >, Ge < 2 + > and Mn < 2 + >; x is selected from halogen anions; the surface of the perovskite nanocrystal is coated with an organic ligand layer; the organic ligand comprises a halogenated organic ligand. In the surface modified perovskite nanocrystal, the surface of the perovskite nanocrystal is coated with the organic ligand layer, so that surface defects can be effectively passivated at the same time, and the surface integrity and the crystallization quality of the nanocrystal are remarkably improved. And due to the surface consistency, the defect state density is reduced, and the exciton and phonon coupling coefficient is reduced, so that a non-radiative composite channel is remarkably inhibited, and the optical performance of the perovskite nanocrystal is remarkably improved.

This invention relates to an intrinsically fluorescent polyester elastomer and its preparation method. The elastomer is copolymerized from vanillin-based aldehyde monomers with small-molecule cyano monomers and cyano-terminated polyethers or polyester diols via a Knoevenagel polycondensation reaction. By adjusting the molar fraction of the soft segment, a continuous transition from rigid fluorescent plastics to highly elastic fluorescent polyester elastomers can be achieved. The resulting material exhibits both high fluorescence quantum yield and high elongation at break, and can be applied in fields such as melt spinning, fluorescent anti-counterfeiting, and flexible optoelectronic devices.

The invention discloses a PET (Polyethylene Terephthalate)-based carbon dot which is prepared by taking PET waste as a precursor and adopting a one-step pyrolysis method, and the PET-based carbon dot has remarkably improved fluorescence quantum yield and has a good flame-retardant modification effect on polymers such as PET / PA6 (Polyethylene Terephthalate) / PA6 (Polyamide 6) / PA66 (Polyamide 66) and the like.

This invention discloses a novel fluorescent probe for the detection of hydrazine hydrate, its preparation method, and its application, belonging to the field of fluorescent probe technology. The novel fluorescent probe provided by this invention uses a hemicyanine dye derivative as the fluorophore; simultaneously, the thiophene ester in the novel fluorescent probe serves as a specific recognition group for N2H4. On the one hand, its electron-withdrawing effect can efficiently quench the fluorescence of the hemicyanine dye derivative, making the probe "fluorescently silent" when not in contact with the target analyte; on the other hand, its unique structure endows the probe with excellent selectivity and sensitivity, ensuring specific recognition of N2H4. Furthermore, this novel fluorescent probe exhibits advantages such as high accuracy, high sensitivity, immunity to interference from various amino acids, common cations and anions, and good specificity when used for the quantitative detection of N2H4. It also has good pH adaptability and water solubility, thus showing promising application prospects in the detection of hydrazine hydrate.

This invention provides a compound containing a phosphate ester group, its preparation method, and its application in perovskite light-emitting devices. The compound structure is shown in formula (I). This invention utilizes the strong electron affinity of the phosphate ester group to regulate charge carriers in the device, increasing the local carrier concentration on the perovskite film surface and promoting carrier radiative recombination. The phosphoxy groups in the compound have physical and / or chemical interactions with the perovskite components, influencing the kinetic behavior of different components during crystallization, regulating phase composition, passivating unsaturated lead defects in the perovskite lattice, reducing non-radiative energy loss, and improving the fluorescence quantum yield of the perovskite film. By introducing different substituents, the defect passivation effect can be adjusted. Devices obtained using the compound of this invention as an additive achieve high external quantum efficiency without significantly affecting the structure and luminescent properties of the perovskite itself.

The invention relates to triaryl boron modified aza [7] helicene derivatives with two-photon absorption and two-state circular polarization luminescence characteristics. The invention belongs to the technical field of organic photoelectric functional materials, and provides an aza [7] helicene derivative with dual-state circular polarization luminescence and two-photon absorption properties. The fluorescent quantum efficiency of pure carbon [7] helicene is remarkably improved, and the double-state CPL and strong TPA characteristics are realized in a single organic molecule.

The invention relates to the technical field of nanometer materials, in particular to a synthesis method of gold nanoclusters and application of the gold nanoclusters in food pigment detection.The gold nanoclusters are prepared with natural plant protein ginger protease containing sulfydryl and reducing amino acid as an exclusive template through the following steps that an enzyme solution and a chloroauric acid solution are prepared and mixed and stirred in proportion to form colloid; and adding NaOH to adjust the pH so as to unfold the protein structure, carrying out microwave treatment after constant volume and uniform mixing, cooling, and storing in a dark place. The ginger protease is innovatively selected as a template, microwave synthesis is adapted, the synthesis period is shortened, and the product performance is improved; the detection system is high in specificity, good in interference resistance, mild in reaction condition, simple and convenient to operate, suitable for rapid detection of target pigments in various foods, and high in application value.

This invention discloses a difluorobenzothiadiazole-based panchromatic fluorescent molecule and its preparation and application. The structural formula of this difluorobenzothiadiazole-based fluorescent molecule is shown in formula (1): In formula (1), R is independently selected from silyl, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl. The difluorobenzothiadiazole-based fluorescent molecule provided by this invention has a novel structure and is a compound with higher fluorescence intensity, quantum yield, and longer lifetime. It can achieve fluorescence emission across the entire visible range from blue to red in liquid, solid, and thin film states.

The invention is applicable to the technical field of synthesis and application of optical functional materials, and provides a high-water-solubility large-pi conjugated SO2 probe, the structure of the probe is D-(pi) nA, and a preparation method of the probe comprises the following steps: step 1, synthesis of an electron donor of the probe, step 2, synthesis of an electron acceptor of the probe, and step 3, synthesis of a probe TFM3-2. The SO2 probe has high selectivity, low detection limit and strong water solubility, and can be applied to on-site rapid detection of sulfite in food and detection of organism cell membranes and organism endogenous SO2.

The invention discloses a bi-state emission phenanthroimidazole blue light material with high radiation transition rate and application thereof, the molecular structure of the blue light material takes phenanthroimidazole with bipolar characteristic as a core unit and takes different functional groups as electron donor or acceptor units to construct an efficient blue fluorescence system. Specifically, a methyl phenyl group is introduced to the C2 position of phenanthroimidazole, so that the blue light-emitting characteristic of the material is effectively maintained; meanwhile, different functional groups are introduced to the N1 site, so that the fine adjustment of the emitted light color is realized, and the radiative transition rate is remarkably improved. The preparation method of the blue-light-emitting material is simple and convenient, the blue-light-emitting material is easy to purify, and the blue-light-emitting material has the advantages of high radiation transition rate and high fluorescence quantum yield and has important application prospects in the field of organic light-emitting diode display.

This application discloses a compound of formula (I), and its tautomers, polymorphs, solvates, or salts thereof. The compound provided in this application is a novel fluorescent material with a benzisoindole dimer framework.

The application discloses a boron-nitrogen doped polycyclic aromatic compound and a synthesis method thereof, and relates to the technical field of organic synthesis. The application takes o-bromonitrobenzene as raw material, and first carries out a Bartoli reaction with vinyl magnesium bromide to synthesize 7-bromoindole; then carries out twice coupling reactions under the action of a metal catalyst to form a dimer of indole; carries out a reaction of the dimer of indole with di-tert-butyl dicarbonate to obtain a single Boc dimer of indole; carries out a borohydration reaction on the single Boc dimer of indole to obtain a boron-containing intermediate; and finally carries out a reaction with a Grignard reagent to obtain the boron-nitrogen doped polycyclic aromatic compound. The synthesis method has the characteristics of a relatively short reaction path, simple operation method and mild reaction conditions. Meanwhile, the compound synthesized by the application is sensitive to fluoride ions and has a high fluorescence quantum yield, and can be applied to the fields of fluoride ion sensors and organic photoelectric materials, and has a wide application prospect.

The application provides a fluorescence probe targeting endoplasmic reticulum and a preparation method and application thereof, and the fluorescence probe is an azido phosphorus corrole complex. F The complex has good solubility and fat solubility (LogP=1.08), a relatively high fluorescence quantum yield (Phi 2 Red light illumination for 1h, and basically no photobleaching phenomenon is observed), in addition, the complex can quickly penetrate the cell membrane and be taken up by cells (uptake time is within 30min), and is highly specific to the endoplasmic reticulum in cells (Pierce coefficient is as high as 0.92), and the labeling condition is simple and mild, and residues are easy to remove, and is a very potential endoplasmic reticulum fluorescence probe.

The application relates to the technical field of detection analysis, and particularly discloses a DNA-nano silver cluster, a preparation method and application thereof. The application rapidly identifies the everted level of phosphatidylserine in blood cells through a composite nano silver cluster fluorescence sensing array technology, thereby realizing real-time prediction of disseminated intravascular coagulation of sepsis, filling the blank of the sepsis DIC prediction method, and avoiding the lag of the existing sepsis DIC diagnosis, so that a new time window is provided for sepsis DIC treatment.

The application discloses a kind of azahemicyanine dyes and application thereof, compared with the dye similar to the function of novel azahemicyanine dye molecule provided by the application, the application can effectively prevent the non-specific combination of serum albumin and hemicyanine dye, and the stability, fluorescence quantum yield and stoke shift of the hemicyanine dye are enhanced;The dye synthesis step provided by the application is simple, easy to purify, and has high yield;By introducing six-membered heterocyclic ring into the side chain of azahemicyanine dye, the combination with protein is effectively avoided, the false positive interference of serum albumin on dye fluorescence signal is excluded, and kidney targeting is realized, and the high fidelity of imaging is improved;The probe NA-H2S2 synthesized based on the dye NA-6 provided by the application is used for rapid detection of the change of H2S2 concentration;The synthesis step of the dye molecule is simple, easy to purify, has excellent imaging performance, fluorescence signal is not interfered by serum albumin, and is suitable for high-fidelity imaging of kidney.

The application discloses an aggregation-induced emission material, a preparation method and application thereof, and belongs to the technical field of preparation of the aggregation-induced emission material. The aggregation-induced emission material prepared by the application is an organic small molecule with an aggregation-induced emission effect. The fluorescent solar concentrator prepared by using the aggregation-induced emission material overcomes the problem of low efficiency of the existing fluorescent solar concentrator, and especially overcomes the problem of great efficiency attenuation caused by the increase of the device size.

The application belongs to the technical field of quantum dot synthesis, and specifically discloses a synthesis method of large-size high-light-efficiency narrow-spectrum-band multi-element blue quantum dots, which comprises the following steps: preparing a quantum dot core solution with a low doping ratio, and washing out the inner core in the quantum dot core solution; introducing inorganic fluoride ions to control the growth behavior of the quantum dot core, so that the quantum dot core grows uniformly, and the fluorescence spectrum data of the growth process are monitored; when the fluorescence spectrum data reaches an expected value, the growth of the quantum dot core is immediately stopped; and the stopped quantum dot core is coated with a protective shell of ZnSe and ZnS. The synthesis method of the large-size high-light-efficiency narrow-spectrum-band multi-element blue quantum dots can avoid non-uniform growth caused by excessively large size, reduce the Te doping ratio in the core, and reduce the spectral tailing caused by non-uniform Te doping, thereby providing a feasible path for preparing high-performance blue light electroluminescent diodes and realizing commercialization of quantum dots.

The invention discloses a preparation method of a siloxane-based fluorescent material for detecting trifluralin under sunlight, and particularly relates to the field of high polymer materials, vinyl siloxane and various brominated compounds are used as raw materials, and the siloxane-based fluorescent material is prepared based on a Heck reaction under the action of a catalyst; the siloxane-based material synthesized by the method disclosed by the invention has the fluorescence quantum yield up to 90%, and emits macroscopic blue-violet light under sunlight; according to the invention, trifluralin can be detected under sunlight, and the method has the characteristics of low detection limit, high sensitivity, good selectivity and rapid response.