499 results about "Quantum yield" patented technology

The invention provides a boron-nitrogen heterocyclic compound as well as an intermediate and a preparation method thereof, the boron-nitrogen heterocyclic compound has a structure as shown in a general formula (1), and is prepared by taking compounds as shown in a formula A, a formula B and a formula C as intermediates. Compared with similar carbon skeleton molecules, the boron-nitrogen heterocyclic compound provided by the invention shows an excellent narrow-band luminescence property. The half-peak width of the emission spectrum of the boron-aza compound is as low as 6.4 nm, and meanwhile, the fluorescence quantum yield is as high as 97%.

The invention relates to the technical field of medical chemistry, in particular to a bridge oxygen site regulatively modified rhodamine anti-cancer fluorescent compound as well as a preparation method and application thereof. The invention develops the rhodamine anti-cancer fluorescent compound of which the meso site is functionalized by tetraarylethene and the bridge oxygen site can be regulated and modified, the fluorescent compound has adjustable red light-near infrared fluorescence emission and excellent fluorescence quantum yield, and the quantum yield can be as high as 99%; the fluorescent compound specifically targets mitochondria, and mainly inhibits growth of tumor cells by inducing para-apoptosis; under irradiation of 655 nm near-infrared laser, ferroptosis is further triggered, efficient treatment of tumor cells is achieved through chemical-photodynamic synergistic effect, and a new treatment thought is provided for overcoming tumor drug resistance.

The invention discloses an ether chain modified rhodamine fluorescent dye, an ether chain modified rhodamine fluorescent dye probe and a preparation method and application thereof, through modification of an ether chain, the water solubility of the rhodamine dye is improved, the aggregation quenching effect is reduced, meanwhile, the intramolecular torsional charge transfer (TICT) is reduced through the electron withdrawing effect of oxygen atoms, and the fluorescence sensitivity is improved. Finally, the quantum yield of the rhodamine dye is greatly improved. The quantum yield of ether chain modified oxygen rhodamine water is increased from 0.31 to 0.70, and the quantum yield of silicon-based rhodamine water is increased from 0.19 to 0.41. The rhodamine dye disclosed by the invention has the characteristics of high brightness, easiness in functional derivation and the like, and has application prospects in the fields of fluorescent probes, fluorescent labels, super-resolution fluorescence imaging and the like.

The invention relates to the technical field of organic synthesis and the technical field of fluorescent materials, in particular to a boron coordination salicylhydrazone double-state emission fluorophore as well as a preparation method and application of the boron coordination salicylhydrazone double-state emission fluorophore. The structure of the boron coordination salicylazone double-state emission fluorophore is shown as I, II or III; wherein R1 is selected from one of H, halogen atoms, diethylamino and thienyl, R2 is selected from one of H, halogen atoms, diethylamino and thienyl, and R3 is selected from one of aryl, 9, 9 '-spirobifluorenyl, alkoxy and halogen atoms. The boron coordination salicylazone double-state emission fluorophore is diversified in structure and good in solubility, has excellent photophysical properties and extremely high quantum yield, and also shows excellent biocompatibility and remarkable liposome targeting property at the same time. Moreover, the preparation method of the boron-coordinated salicylazone double-state emission fluorophore adopts a one-pot two-step method, is simple and convenient, is high in yield, is green and environment-friendly, and has a wide application prospect.

The invention provides a preparation method of nitrogen and phosphorus-doped carbon dots and application of the nitrogen and phosphorus-doped carbon dots in quercetin detection, the nitrogen and phosphorus-doped fluorescent carbon dots (N, P-CDs) are successfully constructed for the first time by adopting a hydrothermal synthesis method, and the carbon dots have emission peaks at 465 nm under the excitation wavelength of 325 nm and show green fluorescence under the irradiation of an ultraviolet lamp; quinine sulfate is used as a standard reference substance, and the quantum yield is 1301%; an N, P-CDs solution is used as a probe molecule, after quercetin is added, fluorescence quenching of N, P-CDs is induced, and the concentration of quercetin and the fluorescence intensity of N, P-CDs are linearly changed, so that the method can be used for quantitative detection of quercetin. The N, P-CDs preparation method provided by the invention is simple and rapid, the product property is stable and non-toxic, the detection sensitivity on the quercetin is high, and the N, P-CDs can be used for detecting the content of the quercetin in serum.

The invention discloses a fluorescent probe as well as a preparation method and application thereof. The invention provides a series of fluorescent probes with novel structures, and the fluorescent probes take 2-(isoquinoline-1-yl) pyrrole boron difluoride as fluorophores, so that the fluorescence quantum yield of the probes is improved, the detection resolution of nitric oxide is increased, and the detection sensitivity is improved. The fluorescent probe disclosed by the invention has the characteristics of large Stokes displacement, high fluorescence quantum yield, good selectivity and short response time.

Provided are a photoelectric conversion element and an imaging element which are excellent in response speed and exhibit a high external quantum yield, and a photoelectric conversion element material that contributes to production of these elements. An imaging photoelectric conversion element (100) includes a layer containing a photoelectric conversion element material represented by formula (1) below, where EWG represents an electron-withdrawing group, L represents an aromatic hydrocarbon group having 6 to 30 carbon atoms, n represents 1 to 8, k represents 0 to 2, and p represents 1 to 8, where p is 1 if k is 0.

The utility model relates to a diagnostic imaging system and a radiation detector thereof. The radiation detector comprises an anode assembly, a cathode assembly, a conversion assembly and an irradiation assembly. In the diagnostic imaging system, radiation penetrates through the cathode assembly and reaches the conversion assembly, visible light and / or infrared light are / is emitted through the irradiation assembly to irradiate the conversion assembly, so that the radiation can be converted into electrons and holes in the conversion assembly, the electrons can be collected by the anode assembly, and the electrons are collected through the anode assembly. Therefore, the number change of electrons can be detected at the contact position of the signal generator and the anode assembly, the electrons can be converted into radiation site signals, radiation penetrating through a to-be-imaged object is detected, the transparent electrode is transparent to infrared light and / or visible light, the photoinduced quantum yield is increased, and the imaging quality is improved. The above effects improve the stability of the radiation detector in a radiation use environment.

The invention discloses a near-infrared organic fluorescent dye with mechanical responsiveness, and relates to the technical field of organic fluorescent dyes, the near-infrared organic fluorescent dye with mechanical responsiveness is prepared through seven-step reaction, an intermediate M1 containing a hydroxyl active end is firstly prepared, then intermediates M2, M3 and M4 are obtained through multi-step reaction, a target dye is obtained after purification, and finally surface functionalized nano-particles are self-assembled, so that the near-infrared organic fluorescent dye with mechanical responsiveness is obtained. The preparation method has the advantages that by designing a conjugate regulation and control structure of a rigid chromophore core and a flexible bridging unit, a mechanical response group is directionally grafted to the tail end of the flexible bridging unit through a CuAAC click chemical reaction; the problems of low fluorescence quantum yield and high response threshold caused by conjugation conflict of a traditional mechanical response group and a near-infrared chromophore are solved, the mechanical response threshold is reduced to a low stress range required by biomechanical detection, collaborative optimization of mechanical responsiveness and near-infrared fluorescence performance is realized, and the method is suitable for the fields of high-sensitivity biological stress monitoring and the like.

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 belongs to the technical field of luminescent materials, and particularly relates to a binuclear platinum complex and application thereof. The binuclear platinum complex has the structure shown in formula (1), and when used in an OLED, especially in a blue light emitting region, the binuclear platinum complex exhibits enhanced phosphorescence quantum yield, good luminescence stability, high luminescence efficiency, and is suitable for use as an emitter material in OLED application. The metal platinum complex of the application can obtain an organic electroluminescent device with deep blue phosphorescence and improved luminescence efficiency, and the luminescent device has good thermal stability. The binuclear platinum complex has the advantages of narrow emission spectrum, high stability and high efficiency by adjusting the structure of the ligand around the metal center and the structure of the substituent on the ligand to control the photophysical properties, and has wide application prospects in many fields such as OLED display and lighting.

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.

The present invention relates to an improved method for the fabrication of silicon dioxide-encapsulated quantum dots with improved photoluminescence quantum yield at elevated temperatures. The invention further relates to quantum dots fabricated according to the new method and the use of the quantum dots in an optoelectronic device.

The invention relates to the technical field of smart agriculture, and discloses a spectrum feed-forward greenhouse control system based on physiological vector Pareto optimization, comprising an intelligent sensing module for collecting crop pulse modulation fluorescence parameters, spectrum fingerprints and environmental parameters; the model decision-making module is coupled with the three algorithm units, the long-period unit is used for outputting an optimal allowable interval of environment regulation and control based on a crop model, the short-period unit is used for predicting physiological risks and outputting dynamic regulation weights based on spectral feedforward, and the real-time unit is used for constructing physiological vectors composed of actual photochemical quantum yield and non-photochemical quenching; executing Pareto optimization under interval constraint and weight guidance, balancing light energy utilization efficiency and physiological stress, and generating an accurate control instruction; the intelligent execution module regulates and controls the environment; and the online calibration module is used for recording data to update the crop model and the prediction model online. According to the method, long-term energy efficiency planning and instantaneous physiological optimization are coordinated, and the precision, prospect and adaptive capacity of greenhouse control are improved.

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 present application relates to the field of fluorescent carbon nanomaterials, in particular to a method for preparing pure purple light oxygen-doped carbon quantum rings with a half-peak width of 18 nm and a quantum yield close to 100% and applications thereof. The present application uses 2,3-dihydroxynaphthalene as a carbon source precursor, and prepares narrow-band purple light carbon quantum rings with a quantum yield close to 100% through a solid-phase catalytic reaction. The carbon quantum rings prepared by the present application have a hexagonal ring structure with oxygen doping, and have a wide application prospect in the field of display devices.

The invention provides a conjugated polymer containing a phenanthroimidazole group as well as a preparation method and application of the conjugated polymer. A light-emitting unit phenanthroimidazole group is introduced into a conjugated main chain of a conjugated polymer donor unit, so that the molecular energy level of the polymer is effectively adjusted, the polymer has high fluorescence quantum yield and electroluminescence efficiency, non-radiation energy loss is effectively reduced, the photoelectric conversion efficiency and open-circuit voltage of a device are further improved, and the photoelectric conversion efficiency and the open-circuit voltage of the device are improved. And the material can be widely applied to photoelectric conversion, field effect devices and the like.

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.

The invention discloses a rhizoma polygonati derived carbon dot with a Schiff base structure as well as a preparation method and application of the rhizoma polygonati derived carbon dot. The rhizoma polygonati derived carbon dot comprises the Schiff base structure, hydroxyl and carboxyl functional groups, the rhizoma polygonati derived carbon dots are spherical in microstructure and uniform in particle size distribution, the particle size range is 1.5-3.6 nm, and the lattice spacing is 0.20-0.21 nm. The water solubility is good, the emission wavelength is 407 nm under excitation of 330 nm, and the absolute fluorescence quantum yield is 16.2%; the fluorescent probe shows high specific recognition capability on metal ions such as Fe < 3 + >, the detection limit is as low as 1 mu M, and the fluorescence intensity and the ion concentration are in a good linear relationship within the concentration range of 10-100 mu M; good free radical scavenging capacity is achieved, and the scavenging effect on DPPH and ABTS free radicals at the concentration of 100 micrograms / mL reaches 80% or above; and a certain broad-spectrum antibacterial effect is achieved.

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.

The application belongs to the technical field of fluorescent nanomaterials, and provides nitrogen-doped carbon dots, a preparation method thereof and application of the nitrogen-doped carbon dots in colorimetric / fluorescent dual-mode visual detection of pH and histamine, to solve the problem that regular colorimetric signals of current carbon dots are difficult to achieve, which limits the application of the carbon dots in biomedicine and photoelectric devices. The nitrogen-doped fluorescent carbon dots are synthesized by one-step hydrothermal reaction of o-phenylenediamine and 2,6-pyridinedicarboxylic acid, water and hydrochloric acid. The preparation method is simple and fast, the synthesized carbon dots have good water solubility and biocompatibility, stable optical properties, high fluorescence quantum yield, can quickly and visually detect intracellular pH and histamine in food spoilage process, have excellent selectivity and anti-interference ability, fast response speed, high sensitivity, and can realize on-site and instant detection by means of a smart phone and a test strip.

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.