1101results about How to "High fluorescence quantum yield" patented technology

Provided is a composite luminescent material. The composite luminescent material comprises: a matrix; and perovskite nanoparticles. The perovskite nanoparticles are dispersed in the matrix, wherein the mass ratio of the perovskite nanoparticles matrix to the perovskite nanoparticles is 1:(1-50).

The invention provides a novel class of reactive fluorescent agents that are based on a pyrene sulfonic acid nucleus. The agents are readily incorporated into conjugates with other species by reacting the reactive group with a group of complementary reactivity on the other species of the conjugate. Also provided are methods of using the compounds of the invention to detect and / or quantify an analyte in a sample. In an exemplary embodiment, the invention provides multi-color assays incorporating the compounds of the invention.

The invention discloses a 1,3,5-triazine derivative. The derivative is a compound with a structure of a formula I. The compound of the formula I can emit high-efficiency blue fluorescence and meanwhile has higher triplet state energy; so that the compound of the formula 1 can sensitize green and red phosphorescent doped materials while emitting the high-efficiency blue fluorescence, so that the technological conditions for preparing WOLEDs (White Organic Light Emitting Diode) are met. Meanwhile, the invention also discloses a preparation method of the compound of the formula 1 and application in preparation of the white light organic electroluminescent diode.

The invention relates to a method for forming graphene quantum dots, and in particular, to doped graphene quantum dots. The graphene quantum dots are co-doped with nitrogen and sulfur. The co-doped elements introduce a new type and high density of surface state of graphene quantum dots, leading to high yield and excitation-independent emission.

The invention discloses a fluorine-boron fluorescent dye as well as a preparation method and application thereof, wherein the structure of the fluorine-boron fluorescent dye is shown as a formula (I) or a formula (II), in the formula (I) and the formula (II), R1 is H or halogen; R2 is CN; R3, R4, R5 and R6 are independently selected from H, halogen, C1-C6 alkyl or C1-C6 alkoxy; V, W, X, Y and Z are independently CH or N, and when V, W, X, Y or Z is N, N has no substituent group. According to the fluorine-boron fluorescent dye and the preparation method thereof, the maximal fluorescence emission wavelength of the fluorine-boron fluorescent dye is 518-600nm, and the fluorine-boron fluorescent dye also has excellent fluorescence quantum yield and Stokes shift, which shows that the fluorine-boron fluorescent dye has good application prospect in the bioanalysis fields of fluorescence labeling, bioimaging and so on; meanwhile, the preparation method is simple in steps, and raw materials can be obtained easily.

The invention relates to carbon dots with high fluorescent quantum yield, and an application thereof in fluorescent color development, and belongs to the application field of fluorescent carbon nanomaterials. Specifically, the invention relates to the carbon dots with the high fluorescent quantum yield which are synthesized by using citric acid and ethene diamine as raw materials as a fluorescent ink for writing or fluorescent printing, and further broadens the application thereof in fluorescent electrospining, fluorescent micro arrays and fluorescent composites. The carbon dots with the high fluorescent quantum yield are obtained by blending 1-100 mmol of citric acid and 1-100 mmol of ethene diamine in 5-100 mL of deionized water and transferring the mixture into a reaction kettle; carrying out a hydrothermal reaction for 2-10 hours at a temperature of 100-500 DEG C; cooling the reaction kettle to a room temperature after the reaction is finished to obtain a water solution of the carbon dots with the high fluorescent quantum yield; pouring the water solution of the carbon dots in a dialysis bag with a molecular weight of 3,500; dialyzing for 48-60 h; spin drying a dialysis outer solution and vacuum drying.

The invention discloses a preparation method of an ABX3 type all-inorganic perovskite nanocrystal. In the preparation process, a solvent is used in a small amount, and the raw material unit price is low (for example, an expensive PbX2 raw material is replaced by cheap lead acetate), environmental requirements are not high in the preparation process, a glove box is not required, the operation procedure is simple, and the cost of raw materials and instruments is greatly reduced. The nanocrystal can synthesize a target product in a wide temperature range of 0 to 300 DEG C in the preparation process, and the morphology, phase, size and luminous performance of the nanocrystal can be controlled by changing the raw material ratio, solvent ratio, reaction temperature and / or reaction time, for example, perovskite nanowires can be prepared at the reaction temperature of greater than or equal to 0 DEG C and less than 90 DEG C, and perovskite quantum dots can be prepared at the reaction temperature of 90 to 300 DEG C. The nanocrystal has good stability and high fluorescence quantum yield (26%-80%), and can realize full visible spectrum (400-700 nm) luminescence. The preparation method is simple in process, short in time consumption, low in cost, easy to amplify and synthesize, and suitable for industrial large-scale preparation.

The invention relates to a stable white-light LED based on silicon dioxide coated perovskite quantum dots, and a preparation method of the stable white-light LED. According to the stable white-light LED based on the silicon dioxide coated perovskite quantum dots, perovskite quantum dots are embedded in a silicon dioxide substrate and combined with a blue-light LED chip to emit white light, 3-aminopropyltriethoxysilane (APTES) is subjected to hydrolysis to form the silicon dioxide substrate, then the perovskite quantum dots are coated by silicon dioxide, stable perovskite quantum dots in the air are obtained, the prepared silicon dioxide coated perovskite red-light and green-light quantum dot fluorescent powder serves as a light emitting layer, the blue-light LED chip serves as an excitation light source, the white light is emitted by utilizing the three-primary-color matching of blue light, red light and green light, and the stable white-light LED based on the silicon dioxide coated perovskite quantum dots is obtained. The stable white-light LED proposes the idea of embedding the perovskite quantum dots into the silicon dioxide substrate formed by hydrolyzing the APTES, so that the obtained silicon dioxide coated perovskite quantum dots can maintain long-term stability in the air and have high fluorescent quantum yield.

The invention discloses a method for preparing nitrogen and sulfur-doped fluorescent carbon quantum dots. According to the method, citric acid is taken as a carbon source, L-glutathione is taken as a nitrogen-sulfur dopant, a microwave oven is taken as a reaction platform, the carbon quantum dots with fluorescence properties are prepared in a heating manner, the residues and moisture are removed through dialysis and freeze drying, and quantum dot powder is obtained. The nitrogen and sulfur-doped carbon quantum dots are prepared by adopting the method disclosed by the invention; the method is simple in operation, low in cost, high in yield, simple in preparation process and equipment, free of a solvent, and easy to popularize and produce on a large scale, and can be rapidly finished within a short period of time; and the prepared carbon quantum dots have the advantages of good water solubility, high fluorescence properties, photobleaching resistance, adjustable emission spectrum, good biocompatibility, low cytotoxicity and the like, and have a good application prospect in the fields of bioimaging, biosensors and photo-electric devices.

The invention relates to a preparation method of doped carbon nitride fluorescent quantum dots.According to the preparation method, melamine and compounds corresponding to doped atoms serve as raw materials, while melamine molecules are roasted to form a carbon nitride structure, the doped atoms enter the carbon nitride structure through a chemical reaction, a doped carbon nitride block material is formed, and the block material is subjected to ultrasound crushing in an alcohol solvent to prepare the doped carbon nitride fluorescent quantum dots which are uniform in quantum size and grain size.The dried quantum dots are good in water solubility and dispersibility and have high fluorescent quantum dot yield.The method can be used for preparing the doped carbon nitride quantum dots in batches, the synthesis method is simple, and repeatability is good.The synthesized quantum dots have wide application prospects in the fields of fluorescence detection, light-emitting devices, biological marking and the like.

The invention provides a method for green synthesis of fluorescent chiral carbon dots. The method comprises the steps of 1, ultrasonically dispersing a carbon precursor and amino acid in deionized water to prepare a transparent aqueous solution or latex, wherein the mass ratio of the carbon precursor to the amino acid is 200:1 to 5:1; 2, putting the mixed solution obtained in the step 1 into a microwave heating device for a microwave heating reaction so as to obtain yellow or brown-yellow liquid; 3, dialyzing the carbon quantum dot solution obtained through the reaction in the step 2 by a dialysis bag of which the molecular weight cut-off is 1,000-50,000 to remove unreacted carbon precursor and amino acid, thereby obtaining fluorescent carbon dots, of which the particle size distribution is narrow, without further purification. The method disclosed by the invention adopts a microwave synthetic method to obtain the chiral carbon dots with the relatively high fluorescent quantum yield through one step, the synthetic method is simple, the required equipment is simple, the repeatability is good, and the method is suitable for preparation of chiral carbon dots on a large scale.

The invention discloses N-benzoyl rhodamine B hydrazide, a method for making the same and an application of the same. The structure of the N-benzoyl rhodamine B hydrazine is shown in formula I. Due to having great molar absorptivity and high fluorescence quantum yield, xanthene dye is an excellent matrix of an optical probe. The xanthene dye derivative-N-benzoyl rhodamine B hydrazide can be selectively reacted with hypochlorite to carry out chromogenic and fluorescence opening reaction; therefore, a system with excellent optical performance can be generated by colorless matter; moreover, detection can be carried out through both a light absorption method and a fluorescence method. In addition, when the N-benzoyl rhodamine B hydrazide is used to detect hypochlorite, high detection sensitivity can be obtained and the detection can be completed just through adopting a small amount of samples, thereby broadening the application range of the method.

Fluorescent dyes and probes are key components in multiphoton based fluorescence microscopy imaging of biological samples. In order to address the demand for better performing dyes for two-photon based imaging, a new series of reactive fluorophores tailored for multiphoton imaging has been disclosed. These fluorophores are based upon the fluorene ring system, known to exhibit high fluorescence quantum yields, typically >0.7, and possess high photostability. They have been functionalized with moieties to act, e.g., as efficient amine-reactive fluorescent probes for the covalent attachment onto, e.g., proteins and antibodies. The synthesis and the single-photon spectral characteristics, as well as measured two-photon absorption cross sections of the reactive fluorophores in solution are presented. Spectral characterizations of bovine serum albumin (BSA) conjugated with the new reactive probe is presented.

The invention relates to the technical field of quantum dot preparation, in particular to a method for preparing carbon quantum dots, and solves the problems that mass production cannot be realized because raw materials are difficult to obtain, and the fluorescence quantum yield of the obtained carbon quantum dots is low in the conventional method for preparing the carbon quantum dots. The method for preparing the carbon quantum dots comprises the following steps of: heating dried plant stalks in a tubular electric heating furnace, introducing air through an air lead-in pipe of the tubular electric heating furnace, and leading flue gas generated by reaction in a water tank through a flue gas lead-out pipe to obtain soot; adding the obtained soot into nitric acid solution for refluxing and acid boiling, regulating the pH value of reaction solution to be between 6 and 8, and removing water to obtain a solid product; and mixing the solid product and polyethylene glycol in a mass ratio of 3:(2-1) in deionized water, and centrifuging to obtain the carbon quantum dots. The process is easy to operate and can be widely applied to the fields of biological detection, sensing, photoelectric conversion, catalysis, optical amplitude limiting and the like.

The present invention provides semiconductor-nanoparticle-dispersed small silica glass particles that emit bright fluorescent light with high fluorescence quantum yield and high density, compared to the conventional semiconductor-nanoparticle-dispersed small glass particles, and that have excellent fluorescence intensity stability over time; and a process for preparing the same. The semiconductor-nanoparticle-dispersed silica glass particles have a mean particle size of not less than 10 nanometers and not more than 5 micrometers, and contain a hydrolyzed alkoxide and semiconductor nanoparticles at a concentration of not less than 2×10−5 mol / l and not more than 1×10−2 mol / l. The particles emit fluorescent light with a fluorescence quantum yield (quantum yield) of 25% or more (and 60% or more), when dispersed in a solution.

The invention provides fluorescent probe compounds, a preparation method and use thereof, belonging to the detection of palladium ions in the field of fine chemical industry. The fluorescent probe compounds designed on the basis of the 'opening-closing' property of the spiral ring in the molecule of a rhodamine luminescent dye well solve the difficult problem that the palladium ions quench fluorescence. The excitation wavelength and the emission wavelength of the probe compounds are both in a visible light region. The compounds have excellent selectivity to the palladium ions in the practical detection range of nearly neutral pH and have excellent sensitivity. The fluorescence is obviously enhanced in the process of detecting the palladium ion concentration of 0-10ppb, an excellent linear relationship between the palladium ion concentration and the fluorescence enhancement is formed, and the palladium ions of 5nm can be detected at lowest. The probe compounds have extremely quick response for distinguishing the palladium ions and are the reported palladium ion probes with the shortest response time so far. The probe compounds can be used for realizing the detection of the palladium ions in the two manners of fluorescent light and color comparison, and has potential application value in the detection of palladium pollution and residual level in medicines, water samples, soils and catalytic reactors.

The invention relates to a copper ion / mercury ion fluorescence molecular probe, and a preparation method and application thereof. The invention mainly aims to solve the problem of single detection ion in the fluorescence molecular probe for detecting copper ions or mercury ions in the prior art, and the problems of low sensitivity, poor selectivity, high sensitivity to pH value, and the like in most fluorescence molecular probes. The preparation method of the fluorescence molecular probe comprises the following steps: (1) dissolving 1 part of rhodamine B in ethanol, adding 2-5 parts of hydrazine hydrate at room temperature, stirring under reflux for 1-2 hours, cooling, and filtering to obtain a precipitate; and (2) adding 1 part of precipitate into 50-500 parts of mixed solvent composed of methanol and dichloromethane in a volume ratio of 3:1, adding 2-6 parts of 40-60wt% formalin, stirring at room temperature in a nitrogen atmosphere for 6-8 hours, evaporating under reduced pressure to remove the solvent, and carrying out silica gel chromatographic separation to obtain the fluorescence molecular probe. The invention has the advantages of high fluorescence quantum yield, low sensitivity to solvent polarity, high chemical / light stability and the like.

The invention discloses fluorescent carbon quantum dots as well as a preparation method and an application thereof. The preparation method of the carbon quantum dots comprises the steps of adding secondary water into malic acid (or malic acid and ethanol amine, or malic acid and ethane sulfonic acid), which serves as a raw material, carrying out ultrasonic treatment so as to obtain a clarified solution, putting the clarified solution into a microwave oven, reacting for 5-20 minutes so as to obtain solid, dissolving, filtrating, and dialyzing, so as to obtain undoped (or nitrogen-doped, or sulfur-doped) water-soluble fluorescent carbon quantum dots. The preparation process of the carbon quantum dots disclosed by the invention is simple, and the prepared carbon quantum dots are stable in optical property and good in biocompatibility. The carbon quantum dots disclosed by the invention can be applied to the fields of the analysis and detection on Fe<3+> in water, the biological imaging of living cells, fluorescent ink and the like.

The invention relates to one-dimensional organic semiconductor spiral nano-wires with ultra-sensitive fluorescence response upon organic amine gases, and a preparation method and an application thereof. According to the invention, perylene imide derivatives comprising perylene and with asymmetric amphiphilic substituents on two ends are adopted as construction units; in a mixed liquid of a good solvent and a poor solvent, through pi-pi interactions between perylenes of a plurality of perylene imide derivatives comprising perylene and with asymmetric amphiphilic substituents on two ends, the one-dimensional organic semiconductor spiral nano-wires are obtained through self-assembly. The one-dimensional organic semiconductor spiral nano-wires have two significant advantages of a nano-grade spiral structure and good fluorescence quantum yield (up to 25%), such that the nano-wires are suitable to be used in fluorescence detection of organic amine in air. When a network-structured porous membrane woven by using the one-dimensional organic semiconductor spiral nano-wires contacts trace amine vapour (with a concentration of ppb-ppm level), the fluorescence is quenched.

To eliminate the necessity of a dedicated optical system and the flowing of fluorescent microparticles for aligning excitation light with a flat plate-shaped flow cell which internally includes a flow path, a microorganism testing apparatus includes: a first detector that detects fluorescence emitted from microorganisms flowing through a detection flow path when a microorganism detection unit included in a microorganism testing chip is irradiated with excitation light, and converts the fluorescence to an electrical signal; and a second detector that detects scattered light similarly emitted from the microorganisms flowing through the detection flow path, and converts the scattered light to an electrical signal. The alignment of the detection flow path is performed in the direction of the optical axis of the excitation light by controlling and moving a stage having the microorganism testing chip mounted thereon based on the intensity of fluorescence detected by the first detector.

The invention discloses a method for preparing mononuclear AgInS2 quantum dots, comprising the following steps of: (1) adding AgNO3, InCl3, oleic acid, dodecyl mercaptan and solvent octadecene in a reaction container, to obtain an Ag and In precursor mixed liquor; (2) adding sulfur powder into oleylamine, and heating until the sulfur powder is fully dissolved, to obtain an S precursor solution; (3) under protection of argon, heating the Ag and In precursor mixed liquor from room temperature to 50-80 DEG C, and maintaining for 10-60min, in order to discharging air; and then raising temperature to 100-120 DEG C, maintaining for 1-5min, and injecting the S solution, wherein a mol ratio of Ag to S is 1:2, and reaction time is 5-90min; (4) sampling, and dissolving a sample into hexane, to obtain a AgInS2 quantum dot solution; and (5) adding waterless ethanol into the AgInS2 quantum dot solution obtained in the step (4), and centrifugally separating to obtain the mononuclear AgInS2 quantum dots. The method of the invention further raises fluorescent quantum yield of the mononuclear AgInS2 quantum dots prepared by a thermal injection method, in order to reach practical application requirement.

The present invention relates to novel fluorinated 3,6-diaminoxanthene compounds derived from the basic structural formula (I) and to their uses as photostable fluorescent dyes, e.g. for immunostainings and spectroscopic and microscopic applications, in particular in conventional microscopy, stimulated emission depletion (STED) reversible saturable optically linear fluorescent transitions (RESOLFT) microscopy, and fluorescence correlation spectroscopy. The claimed compounds are also useful as molecular probes in various spectroscopic applications.

The invention relates to s-triazine derivatives which not only can be used as organic light-emitting layers, but also can be used as main materials of phosphor materials to be applied to organic electroluminescence devices. The glass transition temperature of the s-triazine derivatives provided by the invention ranges from 70 DEG C to 180 DEG C, the triplet-state energy of the s-triazine derivatives is over 2.7eV, the molecular structure of the s-triazine derivatives contains an s-triazine group, and the s-triazine derivatives have the structural general formula I shown in the specification. The s-triazine derivatives provided by the invention have higher fluorescence quantum yield, high stability and higher steric hindrance so that the solid fluorescence quenching is avoided, and the brightness and efficiency of the devices can be well increased when the s-triazine derivatives are used as the light-emitting layers to be applied to the organic electroluminescence devices; in addition, the s-triazine derivatives have higher triplet-state energy and can be used as the main materials to effectively transfer the triplet-state energy to green and red phosphorescent materials, so that the brightness and efficiency of the organic electroluminescence devices made of the phosphor materials can be increased.

The invention provides a zinc-doped carbon quantum dot, a preparation method thereof and application thereof to the detection field. The carbon quantum dot high in quantum yield can be obtained through an environment-friendly simple one-step hydrothermal method by doping the zinc element for the first time, and the fluorescent quantum yield is high and can reach 63%. The preparation method specifically includes the steps that a carbon source and a zinc source are dissolved to obtain a precursor solution and placed into a hydrothermal reaction kettle to be reacted, after a synthesized product is naturally cooled, the product is separated to obtain a solution, the solution is dried, and the zinc-doped carbon quantum dot high in fluorescent quantum yield is obtained. Raw materials required by the method are few, intermediate products and side products are few, reaction speed is high, and the method is economical and environmentally friendly. The light emitting intensity of the zinc-doped carbon quantum dot is high and can reach 5.8*10<5>, the zinc-doped carbon quantum dot has wide application prospects as a fluorescent probe in biomedical detection, and the zinc-doped carbon quantum dot can be used for trace and quantitative analysis and detection of hydrogen peroxide and glucose.

The invention relates to a preparation method of carbon quantum dots based on amino acid and an application of carbon quantum dots in direct detection of metal ion concentration. The method comprises the following specific steps: uniformly mixing amino acid and distilled water, rapidly adding the uniformly-mixed solution (amino acid is dissolved in distilled water) into a round-bottom flask filled with phosphoric pentoxide, rapidly plugging the bottleneck so as to obtain water-soluble carbon quantum dots, and applying the prepared carbon quantum dots in detection of metal ion concentration by a fluorescence quenching method. The synthetic method provided by the invention has a simple process, and reagents and raw materials are green and nontoxic. The prepared carbon quantum dots have characteristics of high quantum yield, strong light stability, good water-solubility and the like. Based on the quantum dots, a simple, rapid and sensitive method for metal ion quantitative detection can be established.

The invention relates to a preparation method of a CuInS2 / ZnS core-shell structure quantum dot and a CuInS2 / CdS / ZnS core-shell structure quantum dot. The method comprises a preparation method of a CuInS2 multilayer core-shell structure quantum dot by using CuInS2 nano particles as follows: (1) dissolving a copper source and an indium source with a sulphur source to obtain a CuInS2 quantum dot solution; (2) centrifugally purifying the quantum dot solution; dropwise adding zinc and a sulphur precursor liquid to obtain a CuInS2 / ZnS core-shell structure quantum dot solution; and (3) dropwise adding the sulphur source and the sulphur precursor liquid into the CuInS2 quantum dot solution, and dropwise adding zinc and sulphur precursor liquid to obtain a CuInS2 / CdS / ZnS-type quantum dot. The preparation method is easy to operate, low in requirement on equipment and high in repeatability; and finally, the fluorescence quantum yield of the quantum dot is more than 50 percent, and a fluorescence-emission peak can be regulated in spectral ranges of visible light and infrared rays.

The invention discloses a method for preparing full-spectrum fluorescent carbon dots by using a one-pot method, wherein aniline is used as a precursor and is added with an organic acid, and growing isperformed in an organic solvent by a solvothermal method to obtain carbon dots with different fluorescence. According to the method, aniline and an organic acid are added into an organic solvent according to a certain ratio, and growing is performed through a solvothermal method at a reaction temperature of 120-250 DEG C for 2-48 hours to obtain carbon dots with different fluorescence; and afterthe reaction, the reaction kettle is naturally cooled to room temperature, and filtering is performed by using a 220 nm filtering membrane to obtain a carbon dot solution. According to the invention,the emission peak wavelength of the carbon dot synthesized by the method is 450-700 nm, the fluorescence emission peak of the carbon dot is hardly changed along with the change of the excitation wavelength, and the carbon dot has the characteristics of high fluorescence quantum yield and stable fluorescence intensity; and the preparation method has the advantages of simple synthesis steps, short period and high yield.

The present invention provides metal doped carbon points with high fluorescence quantum yield and a preparation method and application thereof. The pure metal-doped carbon points are primarily synthesized by hydrothermal synthesis method, and the pure metal-doped carbon points have high fluorescence quantum yield. The pure metal-doped carbon points can be prepared only by one-step reaction, the cost is low, reaction speed is quick, byproducts and intermediate products are fewer; at the same time the pure metal-doped carbon points have the characteristics of high fluorescence quantum yield, are expected to be used in human blood trace Fe<3+> detection, and have broad application prospects in biological detection and sewage treatment.

The present invention relates to a method for microwave-aided quickly synthesizing zinc selenide fluorescence quantum point. Said method uses water as solvent, and adopts the following steps: mixing zinc salt or zinc oxide and water-soluble mercaptocompound, injecting soduim hydrogen selenide or potassium hydrogen selenide produced by adopting sodium borohydride or potassium borohydride and zinc powder and making them produce reaction to obtain zinc solenide ZnSe precursor solution, then placing said solution in a closed teflon tank and making reaction in a temperature-controllable and pressure-controllable microwave reactor so as to quickly synthesize ZnSe fluorescence quantum point.

The invention relates to novel and improved photostable rhodamine dyes of the general structural formulae I or II and their uses as fluorescent markers, e.g. for immunostainings and spectroscopic and microscopic applications, in particular in conventional and stimulated emission depletion (STED) microscopy and fluorescence correlation spectroscopy. The partially deuterated analogues are useful as molecular mass distribution tags in mass spectroscopic applications, wherein R1=an unsubstituted or substituted alkyl group, including a cycloalkyl group, or heterocycloalkyl group; R2=H, an unsubstituted or substituted alkyl group, including a cycloalkyl group, or heterocycloalkyl group, or an unsubstituted or substituted aryl group or heteroaryl group, or any combination of such groups; X=CH2, C═O, C═NORa, C═NNRaNRb, CH(ORa), O, S, SO, SO2, or any other derivatives of these groups, with Ra and Rb independently being H or an organic residue, in particular an unsubstituted or substituted (cyclo)alkyl group or heterocycloalkyl group, an unsubstituted or substituted aryl group or heteroaryl group; Z=a negatively charged group with 1, 2, 3, 4 or 5 charges per anion.