278 results about "Quantum yield" patented technology

The present application relates to fluorescent material technical field, especially based on benzopentacyclic / septacyclic structure's carbonyl nitrogen type fluorescent material and its preparation method, the present application provides the preparation method with carbazole as raw material, in the synthesis process, the aldehyde group precursor is directly oxidized to acid by using strong oxidant, then the intermediate is made to occur intramolecular Friedel-Crafts reaction by acid catalyst, finally the carbonyl / nitrogen type fluorescent material of inlaid non-benzene structure is synthesized.This structure inhibits molecular relaxation through multiple resonance effect, and then realizes narrow band emission characteristics.At the same time, the structure retains higher photoluminescence quantum yield.The carbonyl nitrogen type fluorescent material based on benzopentacyclic / septacyclic structure provided by the present application is different from the existing all benzene type polycyclic aromatic hydrocarbons, so as to effectively widen the molecular system of carbonyl / nitrogen type narrow band light emitting material.

The invention belongs to the technical field of fluorescent polymer materials, and particularly discloses bifuran polyamide with high quantum yield and capable of emitting yellow-green wavelength light as well as a preparation method and application of the bifuran polyamide. The method comprises the following steps: dissolving a bifuranoyl chloride monomer in an organic solvent to obtain an organic phase; adding an alkaline aqueous solution into the organic phase to form a phase interface, then adding a diamine monomer, and stirring to carry out an interfacial polymerization reaction; and after the reaction is finished, filtering, precipitating, washing and drying to obtain the bifuran polyamide. The bifuran polyamide is prepared by regulating and controlling the main chain structure and chain rigidity and flexibility of the polymer through a diamine monomer with a specific molecular structure, the emission wavelength of the amorphous bifuran polyamide can reach 540-552 nm under exciting light of 480 nm, red shift is performed to 565-568 nm after crystallization, long-wavelength yellow-green light emission, high-quantum-yield light emission and good biocompatibility are achieved, and the bifuran polyamide can be applied to the field of organic light emitting devices, such as organic light emitting devices, organic light emitting devices, organic light emitting devices, organic light emitting devices, organic light emitting devices, organic light emitting devices, organic light emitting devices and the like. The application of the bio-based polyamide in the field of biological imaging is expanded.

The application discloses a lateral test strip for detecting C-reactive protein and application thereof, and the test strip comprises a bottom plate and a sample pad, a combination pad, a nitrocellulose membrane and a water absorption paper which are sequentially stacked on the bottom plate; the combination pad is loaded with AIE fluorescent microspheres; the AIE fluorescent microspheres are composed of P(St-MMA) microspheres coated with AIE materials after hydrolysis and carboxylation; and anti-C-reactive protein antibodies are connected to the AIE fluorescent microspheres through a covalent bond. The surface coating amount of the AIE fluorescent microspheres is increased by 1.6-2.3 times, and the fluorescence intensity per unit mass is increased by about 40-60%. The increase of the coating amount makes the density of the light-emitting core higher, the overall quantum yield is significantly improved, and the uniformity of the fluorescence signal and the detection sensitivity are enhanced. The characteristics are particularly prominent in the detection of CRP protein in the chromatographic test strip, and the detection limit can be effectively reduced, the T / C signal ratio can be improved, and the reaction time can be shortened.

The present application relates to the technical field of fluorescent dyes, in particular to an asymmetric pentamethine cyanine compound. The compound comprises a structure as shown in formula I. The compound provided by the present application has good water solubility, near-infrared absorption, high fluorescence quantum yield and good molar absorption coefficient, and can be used in nucleic acid labeling, DNA sequencing, cell imaging, protein labeling or specific recognition of amino acids.

Photoactive organic ligands used to surface modify nanoparticles are described. The photo active organic ligands can be tailored to absorb radiation within a selected range of wavelengths. Upon absorption of radiation, the ligands react to alter the solubility of the ligand, and may be cleaved, and surface modification of the nanoparticles changes such that solubility of the nanoparticles changes. Coatings prepared with the surface modified nanoparticles can be radiation patterned and developed in accordance to methods described herein. Appropriate selection of a solvent as developer provides image formation facilitated by the difference in solubilities of the nanoparticles. Methods of radiation patterning the coatings are Luminescent nanoparticles surface modified with the photoactive organic ligands can be used to form down shifting light emission substrates suitable for use in electronic displays.

The invention relates to a tri-pyrazolo boron Eu (II) complex, which has the following structure as shown in the specification, the complex shows high photoluminescence quantum yield and excellent air stability and thermal stability, and is suitable for a luminescent layer in an electroluminescent device. The Eu (II) complex Eu (Tp3Me, 5Me) 2 is used as a guest material to be doped in a host material such as SiCzCz, an efficient and stable OLED can be prepared, the maximum external quantum efficiency reaches 16.9%, LT90 reaches 1835 seconds under the initial brightness of 1000 cd / m, and compared with an OLED prepared from the Eu (II) complex Eu (Tp3Me, 5Me) 2 without large steric hindrance, the efficiency and stability are greatly improved, which shows that the performance of the Eu (II) complex OLED can be improved by introducing the large steric hindrance group.

The invention discloses a preparation method and application of high-fluorescence quantum yield perovskite fluorescent powder based on amino acid, and belongs to the technical field of luminescent materials and display, the preparation method is used for preparing the perovskite fluorescent powder, and the preparation method comprises the following steps: dissolving potassium bromide in deionized water, then adding lead bromide, and carrying out ultrasonic dissolution to obtain a first solution; dissolving cesium bromide in another deionized water to obtain a second solution; mixing the first solution and the second solution, and standing to obtain a mixed solution; dropwise adding the mixed solution into absolute ethyl alcohol, and stirring to obtain a precursor solution; adding amino acid into the precursor solution, and stirring to obtain a precursor reaction suspension; and centrifuging the suspension, collecting the precipitate, centrifugally washing the precipitate with absolute ethyl alcohol, and drying the washed precipitate to obtain the perovskite fluorescent powder. The invention provides a green synthesis method of a water-ethanol system, which is combined with an amino acid synergistic passivation effect to realize low-cost preparation and improvement of luminous efficiency.

The objective is to provide a condensed polycyclic aromatic compound that serves as an organic photoelectric conversion material with excellent external quantum yield (EQE), dark current, and response speed when used as a photoelectric conversion element, as well as a material for a photoelectric conversion element, an organic thin film, and an organic photoelectric conversion element using the same. [Solution] The following formula (1) provides a condensed polycyclic aromatic compound. [Formula 1] TIFF2026071189000011.tif21170

The invention relates to the technical field of photovoltaic modules, and particularly discloses a tetraphenyl ethylene-benzotriazole derivative compound and application thereof in the photovoltaic field. The absorption spectrum of the tetraphenyl ethylene-benzotriazole derivative compound disclosed by the invention can be subjected to red shift to 420 nm, so that high-energy ultraviolet light can be completely absorbed; the maximum emission wavelength of a fluorescence emission spectrum is more than 440nm and even can reach 500nm, so that the light utilization level of the crystalline silicon solar cell is improved; the absolute light-emitting quantum efficiency is very high, and the converted wavelength can be better utilized by a photovoltaic device. The substituted tetraphenyl ethylene part contained in the derivative compound has AIE performance, and the fluorescence quenching effect of traditional small organic molecules in high concentration, solid state and aggregation state is avoided. The light conversion film can overcome the problem that the fluorescence quantum yield is remarkably reduced in the laminating process, the performance of the film is not affected when the phenomena of precipitation, agglomeration and the like of auxiliaries in the film occur, and the light conversion film is used for preparing a photovoltaic module.

A quantum dot having a narrow fluorescence half-width and a high fluorescence quantum yield has a core-shell structure including a core formed from ZnSe or ZnSeTe, and a shell that covers the core and is formed from ZnS, wherein a particle diameter of the quantum dot is 5 nm or more and 20 nm or less, and wherein a surface of the core-shell structure is modified with a zinc halide. The quantum dot has a fluorescence quantum yield of 75% or more and a fluorescence half-width of 25 nm or less. The fluorescence lifetime can be made 50 ns or less.

The invention relates to a preparation method and application of selenium-doped carbon quantum dots. The selenium-doped orange fluorescent carbon quantum dots are successfully prepared by treating a mixture of mangosteen peel, ethanol and sodium selenite through a hydrothermal method. Based on the excellent fluorescence property of the carbon quantum dots, the Cr < 2 + > can quench the fluorescence of the selenium-doped carbon quantum dots, so that the Cr < 2 + > can be detected. Meanwhile, the carbon quantum dot is found to be responsive to disease micromolecule glutathione, that is, glutathione can enhance fluorescence of the carbon quantum dot. By utilizing the concentration difference of glutathione in normal cells and cancer cells, the carbon quantum dots can realize the recognition of tumor cells. The orange fluorescent carbon quantum dot provided by the invention is prepared from easily available raw materials, and is safe and non-toxic. The prepared carbon quantum dot has stable fluorescent property, uniform particle size of 4.2 + / -0.5 nm, and relative quantum yield of 34.35%, can be imaged in cells, has GSH detection limit of 27.16 umol / L, and can identify tumor cells and normal cells.

An object is to provide a quantum dot that has a narrow fluorescence half-width and a high fluorescence quantum yield, and emits blue fluorescence. A quantum dot (5) according to the present invention includes at least Zn and Se and does not include Cd, and has a particle diameter of 5 nm or more and 20 nm or less. In addition, the quantum dot (5) according to the present invention includes at least Zn and Se and does not include Cd, and has a fluorescence quantum yield of 58 or more and a fluorescence half-width of 25 nm or less. In the present invention, the fluorescence lifetime can be made 50 ns or less.

It is an object of the present invention to provide a compound that has absorption in a near infrared region, has high efficiency of singlet oxygen generation (quantum yield), and also has high tumor toxicity when it is combined with an immunotoxin. According to the present invention, provided is a compound represented by the following formula (1) or a salt thereof:wherein L1 and L2 each independently represent a single bond, —O—, —CO—, an alkylene group containing 1 to 8 carbon atoms, a sugar chain, or a combination thereof; R1 and R2 each independently represent an alkyl group containing 1 to 8 carbon atoms, a carboxylic acid group, an amino group, a hydroxyl group, a thiol group, or a biotin residue; R3, R4, R5, R6, R7 and R8 each independently represent an alkyl group containing 1 to 8 carbon atoms, a phenyl group, a carboxylic acid group, an amino group, a hydroxyl group, a thiol group, or a biotin residue; and M represents Mg, Zn, Fe, P, Si, Cu, Sn, Al, Ti, Mo, or Ni.

The application discloses a pyridine cation mitochondrial fluorescent probe, the chemical name of the probe is 4-(8-dimethylamino-5-benzocoumarin)-methylpyridine iodine salt, and the chemical structural formula is shown as formula (I). The application further discloses application of the fluorescent probe in labeling or imaging display of mitochondrial distribution or morphology in living cells and in long-range tracking display of mitochondria in living cells and imaging display of nucleoli in cells. Experiments prove that the labeled mitochondrial fluorescent probe has high light bleaching resistance and a high fluorescence quantum yield, can realize long-range tracking of mitochondria in living cells, and can label fixed nucleoli in cells. It is indicated that the fluorescent probe has potential application and development value in the fields of fluorescent probes and tissue imaging, and has a wide application prospect.

The invention relates to the technical field of chemiluminescence probes, in particular to a synthesis method and application of a boron dipyrromethene framework near-infrared two-region chemiluminescence probe based on X-ray activation, and the chemical structural formula of the chemiluminescence probe is shown in the specification. A novel BODIPY compound which is high in quantum yield and has a strong or narrow emission band is used as a chemiluminescence substrate for a core framework, a core framework of an electron withdrawing group with longer emission wavelength, an electron donating group and two molecules with larger wavelength overlap ratio are subjected to one-time CERT effect to be efficiently combined into a single molecule, and 1,050 nm chemiluminescence which is higher than 970 nm is emitted.

The invention discloses a solid electrolyte, a preparation method of the solid electrolyte, an electrochromic device and application of the electrochromic device. The solid electrolyte comprises a matrix, electrolyte salt and carbon quantum dots. The electrolyte salt is dispersed in the matrix. The carbon quantum dots are dispersed in the matrix, raw materials of the carbon quantum dots have carbon-carbon double bonds and nitrogen elements, chemical bonds and / or molecular chains exist between the carbon quantum dots and the matrix, and the fluorescence quantum yield is 30%-80%. According to the solid electrolyte disclosed by the invention, carbon-carbon double bonds of the carbon quantum dots can be cross-linked with a matrix in a curing process to form cross-linking sites, so that the mechanical property of the solid electrolyte is enhanced. Besides, the fluorescence quantum yield of the carbon quantum dots is relatively reasonable, so that the carbon quantum dots, as an ultraviolet absorbent, can convert most of energy of ultraviolet light into visible light with relatively long wavelength instead of heat energy, thereby improving the optical performance of the electrochromic device and reducing the mechanical property problem caused by thermal aging of the solid electrolyte.

This invention relates to a mixed solvent-induced highly fluorescent silver nanoclusters, its preparation method, and its application in LEDs. These highly fluorescent silver nanoclusters are formed by the self-assembly of Ag6 in a mixed solvent of water and NMP through non-covalent interactions such as hydrogen bonding and π-π / π* interactions. Due to the restriction of ligand rotation and vibration, the silver nanoclusters exhibit significant fluorescence properties, with fluorescence intensity reaching 10⁻⁶. 7 The fluorescence lifetime is 11.77 μs and the quantum yield is 17.57%. The method for preparing high-fluorescence silver nanoclusters of the present invention is simple and inexpensive; when mixed with commercial phosphors, it can modulate white LEDs and can be used as a light conversion material for environmentally friendly WLEDs.

The application provides a 2-amino terephthalic acid dimethyl ester-tetracyano benzene eutectic crystal as well as a preparation method and application thereof, the eutectic crystal is of a triclinic system, a space group is a cell parameter is alpha = 95.041 (2) °, beta = 90.337 (2) °, gamma = 97.670 (2) °, and a cell volume is The 2-amino terephthalic acid dimethyl ester-tetracyano benzene eutectic crystal provided by the application increases the solid melting point of the organic compound from 133.39 DEG C to 162.23 DEG C without changing the covalent bond of the compound, enhances the thermal stability, and meanwhile, the fluorescence emission color, the fluorescence lifetime and the quantum yield are obviously changed.

The invention belongs to the field of organic light-emitting materials, and particularly relates to a boron-nitrogen heterocyclic ring dimer with a light-emitting narrow band and a preparation method of the boron-nitrogen heterocyclic ring dimer. The boron-nitrogen heterocyclic ring dimer has a chemical structure shown as a general formula I, and shows a high molar absorption coefficient and a narrow-band luminescence characteristic. The molar absorption coefficient of the boron-nitrogen heterocyclic ring dimer can reach more than 90000 L / (mol.cm), the half-peak width of the emission spectrum can be as low as 5.9 nm, and meanwhile, the fluorescence quantum yield can reach 96%.

The invention relates to a post-treatment method for a mercury-based II-VI group nanocrystal with a protective layer formed by chemical oxidation, and solves the problems of poor stability and photoelectric property degradation of the mercury-based II-VI group nanocrystal caused by surface oxidation, ligand desorption and environmental sensitivity. An oxide protection layer with the thickness of 1-3 nm is formed on the surface of the nanocrystal, the long-term stability and the photoelectric property of the nanocrystal are improved, and the method comprises the specific steps of centrifugal purification of the nanocrystal, preparation of an oxidizing agent solution, controllable oxidation reaction, functional ligand surface modification and purification treatment. The oxidation layer is ensured to be compact and stable by accurately adjusting the concentration of the oxidant, the reaction temperature and the reaction time. According to the method, oxygen and moisture permeation is effectively blocked, surface defects are reduced, the quantum yield and the photoelectric property are improved, and the method is widely applied to the fields of post-treatment of mercury-based II-VI group nanocrystals and photoelectric devices.

The invention discloses a fluorescent pigment compound as well as a preparation method and application thereof. The chemical structural formula of the fluorescent pigment compound is shown in the specification. Wherein n is an integer from 2 to 6, and R1 and R2 are respectively and independently selected from C1-C3 alkyl groups. By introducing 4-tert-butylphenyl and tert-butylsilane ether chains, the compound has excellent solubility, film-forming property, high fluorescence quantum yield (gt, 95%) and light stability (retention rate gt, 90% after ultraviolet irradiation for 500 hours). The preparation method is simple, is suitable for a solution processing technology, and can be widely applied to the fields of OLEDs, light conversion adhesive films, fluorescence sensing, biological imaging and the like.

The invention relates to a nitroimidazole group meso-substituted heptamethine cyanine dye as well as a preparation method and application thereof. According to the dye, a nitroimidazole group is introduced into the middle position of a heptamethine cyanine parent nucleus, so that the dye has excellent absorption characteristics in a near-infrared region, the excitation wavelength is 730-780 nm, the emission wavelength is 800-860 nm, and the dye has good tissue penetrating power. The nitroimidazole group can effectively quench fluorescence in an excited state through a light-induced electron transfer effect, energy is promoted to be released in a non-radiative transition mode, the photothermal conversion efficiency is remarkably improved, and meanwhile high light stability and low fluorescence quantum yield are kept. The dye can be further prepared into a nano preparation and shows excellent biocompatibility and tumor targeting ability. The compound has wide application prospects in the fields of non-diagnostic or therapeutic protein labeling, bioimaging, photothermal therapy and the like, is especially suitable for preparing efficient photosensitive reagent drugs for tumor photothermal therapy, and provides a new strategy for design of near-infrared photothermal diagnosis and treatment materials.

The application belongs to the technical field of detecting substances by optical means, and relates to a method for measuring the peroxide value of oil-containing food. In view of the technical problems of low detection efficiency, low accuracy, and unfriendliness to the detector and environment of the existing method for measuring the peroxide value of oil-containing food, the application provides a method for measuring the peroxide value of oil-containing food, which comprises the following steps: dissolving iodine into a fatty amine and mixing to prepare iodine-doped carbon dots, establishing a standard curve by using the carbon dots and fresh oil-containing food as a standard oil sample, and finally adding the iodine-doped carbon dots into a sample to be measured to react, and calculating the peroxide value by means of fluorescence intensity, so that the peroxide value can be quickly and accurately measured. The preparation method is simple, has good oil solubility, does not use heavy metals, has high fluorescence quantum yield, stable performance, good reproducibility, and good consistency with the national standard result, and expands the application scope of the carbon dots, a fluorescent nanomaterial, in the field of food safety detection.

The invention discloses a fluorescent nylon material and a preparation method and application thereof, and relates to the technical field of high polymer material preparation, the structural formula of the fluorescent nylon material comprises a structural unit derived from 1, 3, 6, 8-tetraaminopyrene and a structural unit derived from a nylon monomer. According to the fluorescent nylon material provided by the invention, the monomer compound and the nylon monomer are copolymerized, and the fluorescent compound can be uniformly dispersed in a nylon matrix, so that the nylon material is endowed with fluorescent performance. The fluorescent nylon material has the characteristics of high brightness, good stability, rich color and the like; the fluorescence quantum yield can reach 85% or above; the fluorescent property is excellent, and bright-colored fluorescence can be emitted under the excitation of ultraviolet light; the nylon has physical and mechanical properties similar to those of common nylon. According to the fluorescent nylon material and the preparation method thereof provided by the invention, a new possibility is provided for expanding the application of the nylon material in the special field.

The invention relates to the technical field of organic photoelectric functional materials, and discloses a full-conjugate carbazolyl pinene chiral tetradentate platinum (II) or palladium (II) complex phosphorescent material as well as a preparation method and application thereof. According to the tetradentate platinum (II) or palladium (II) phosphorescent material disclosed by the invention, a pinene structure with large stereo steric hindrance, a donor carbazolyl structure derivative with anions and different acceptor structure units are introduced, so that the tetradentate platinum (II) or palladium (II) phosphorescent material has a large conjugate plane and a high conjugation degree, and an aggregation state-induced emission enhancement effect is realized; according to the palladium (II) complex phosphorescent material disclosed by the invention, the concentration quenching effect and exciton annihilation caused by long service life are effectively inhibited, and the photoluminescence quantum efficiency of the palladium (II) complex phosphorescent material is improved to the greatest extent, so that the phosphorescent quantum yield of the material is remarkably improved, and the piezo-chromic red shift effect is also realized; the vapor deposition method under specific conditions is applied to the luminescent layer of the electroluminescent device, and has great potential in the aspects of recording, data storage, sensors and the like.

This invention discloses a fluorescence-enhancing nanoparticle, its preparation method, and its applications, relating to the fields of organic fluorescent molecules and bioimaging technology. The nanoparticle comprises: NIR-II fluorescent molecules and an amphiphilic polymer encapsulating the NIR-II fluorescent molecules; the amphiphilic polymer has a hydrophilic segment and a rigid hydrophobic segment. The nanoparticle of this invention, based on "carrier microenvironment engineering," utilizes the rigid confinement and interfacial isolation provided by the amphiphilic polymer with the rigid hydrophobic segment for dual brightening, serving as a universal brightening platform applicable to various NIR-II fluorescent molecules. This nanoparticle can significantly improve aqueous phase quantum yield, enhance contrast and resolution in in vivo vascular imaging, improve deep tissue penetration, increase imaging sensitivity, and facilitate detection under low signal conditions. It also exhibits good stability and biocompatibility, supporting lesion imaging and intraoperative navigation applications.

The application discloses a high-fluorescence-quantum-yield Sb 3+ :Cs2NaInCl6 perovskite preparation method belongs to the technical field of inorganic luminescent material preparation. First, cesium chloride, sodium chloride, indium chloride and antimony chloride are mixed and ground, the obtained powder is placed in a vacuum drying box and is treated at 60-300 DEG C for 0.5-2h, a mixture of oleylamine and oleic acid is added, and grinding is continuously performed until the solution becomes uniform, a hydrochloric acid solution with pH=3.2 is added to the product, and after uniform grinding, DOPC is immediately added to the product, and it is observed that the blue fluorescence of the product is strengthened, thereby obtaining high-purity and high-fluorescence-efficiency Sb 3+ :Cs3TbCl6NCs inorganic perovskite. The application realizes Sb doping through mechanical grinding for the first time 3+ :Preparation of Cs2NaInCl6 NCs, and the fluorescence efficiency of the Cs2NaInCl6 NCs is obviously enhanced through post-processing, thereby being Sb 3+ :Application of Cs2NaInCl6 in photoelectricity provides a good prospect.

The invention relates to the technical field of biology, in particular to a red fluorescent protein mCrimsonX as well as a construction method and application thereof. The invention relates to a red fluorescent protein mCrimson X. The mutant amino acids of the red fluorescent protein mCrimson X relative to Crimson comprise N8E, R10P, M15L, S18T, I70V, Y72H, A74K, D75G, F79Y, T94M, Y96F, E111Q, E114V, V116I, V119A, M147I, I160M, N173S, T177E, H193Y and V195I. The invention further discloses a preparation method of the red fluorescent protein mCrimson X. The preparation method has the advantages that mCrimsonX is high-performance long-wavelength fluorescent protein in a visible region; special proteins which cannot be accurately marked by other red fluorescent proteins can be marked; the monomer property is very good, and the extinction coefficient and the quantum yield are relatively high. The method can be used for constructing cell function probes and is wide in application range.

This invention relates to a lysosome-targeting fluorescent dye based on the BODIPY structure and its synthesis method, belonging to the field of organic fluorescent dyes. The invention designs and synthesizes the lysosome-targeting fluorescent dye BDP. The dye molecule uses BODIPY as the parent structure, and a novel lysosome-targeting fluorescent dye molecule is synthesized by introducing diphenylphosphine salt and tert-butyloxycarbonyl groups. The synthetic route of this dye is simple, it possesses excellent photostability, and exhibits good resistance to interference from ions, amino acids, and viscosity. Furthermore, this dye demonstrates superior fluorescence performance in a variety of common solvents, with fluorescence quantum yields exceeding 0.70. Experimental results show that this fluorescent dye can precisely target lysosomes in living cells, demonstrating promising applications in the field of bioimaging.