14results about How to "High quantum yield" patented technology

The invention discloses a polyamine carbon dot as well as a preparation method and application thereof in improvement of corn resistance, and belongs to the technical field of nano agricultural regulation and control. The polyamine carbon dots are subjected to hydrothermal synthesis, the size of the PEICDs is 2.3 nm, the quantum yield of the carbon dots can be increased, carbon dioxide in the atmosphere can be captured and converted into bicarbonate radicals, and it is verified through in-vitro experiments that the PEICDs can improve the carbon dioxide conversion product 3-phosphoglycerate in vitro; under the stress of drought and salt, the polyethyleneimine functionalized carbon dot solution is applied to the leaf surfaces of the crops, so that the growth and development of the crops can be improved by remarkably improving the net photosynthetic rate and the intercellular carbon dioxide concentration, and the adaptability of the crops to the environment is further improved.

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 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 relates to the technical field of biomedical detection, and discloses a kit for detecting pancreatic cancer based on a fluorescence labeling method and application of the kit, and the kit is composed of eutectic solvent precursor dispersion liquid containing an interface stabilizer and a polycarboxylate regulator. According to the method, the deep eutectic solvent is driven to be separated out from the water phase by utilizing the strong hydration capability of the polycarboxylate regulator, and the microphase enrichment region with low water content is constructed in situ. In the enrichment area, a compact hydrogen bond network limits free movement of water molecules, and a non-radiative transition channel for transferring excited state energy of fluorescent molecules to a hydroxyl vibration energy level of the water molecules is blocked. The unique microenvironment mechanism significantly reduces the fluorescence quenching effect in an aqueous system, greatly improves the quantum yield and detection sensitivity of the fluorescent probe, and effectively solves the technical problem of weak signal in traditional aqueous phase immunodetection.

The invention relates to the field of organic light-emitting materials, and discloses a color conversion composition, a blue light-driven LED and a preparation method thereof, organic boron heteropolycyclic aromatic hydrocarbon organic light-emitting materials (BODIPY and BN) in the color conversion composition are utilized, the molar extinction coefficient is large, the emission spectrum half-peak width is very narrow (10-50 nm), the quantum yield is high, and the thermal stability and chemical stability are good. Compared with the prior art, the color conversion film provided by the invention has the characteristics of simple structure and diverse structure, can realize complete coverage from the whole visible light area to the near-infrared light area, and has excellent compatibility with a base material (such as binder resin), so that the color conversion film with excellent performance is formed, and green light and red light with high luminous efficiency and high color purity can be obtained when the color conversion film is applied to an LED driven by blue light, so that the color rendering index of the LED is improved.

This invention discloses a near-infrared fluorescent silicon dot, its preparation method, and its application in antibacterial and tumor treatment. The silicon dot is generated via a one-step hydrothermal method through a high-temperature condensation reaction between the carboxyl group of a 4-carboxyporphyrin dye and the amino group of a silane coupling agent. The silicon dot synthesized in this invention exhibits excellent water dispersibility, high near-infrared fluorescence intensity and pH stability, uniform morphology, good photostability, good biocompatibility, and high reactive oxygen species (ROS) yield. Furthermore, the preparation method is simple and convenient, uses widely available raw materials, and is low-cost, making it suitable for industrial production. Based on these excellent properties, it can be used to prepare fluorescent probes as fluorescent markers for cell and biological imaging. Its excellent singlet oxygen generation performance can be used for photodynamic therapy against bacteria and tumors. In addition, the silicon dot also possesses peroxidase properties, catalyzing the generation of hydroxyl radicals from hydrogen peroxide, thus enabling its use in chemokinetic therapy.

The application discloses a cycloalkane oxime ester photoinitiator and a preparation method and application thereof, and belongs to the field of chemical synthesis and photocuring technology. The photoinitiator has a structure as shown in the formula (I).

The invention discloses a fluorescence analysis and detection method and system based on quantum dots, and belongs to the technical field of analysis and detection. According to the method, functional modified quantum dots are used as fluorescent probes, a fluorescence detection system is constructed through specific recognition reaction, and high-sensitivity and high-specificity detection of a target detection object is realized by combining collection and quantitative analysis of fluorescence signals. The corresponding system comprises an excitation light source module, a sample reaction module, a fluorescence detection module, a data processing module and a control module, all the modules work cooperatively, key parameters in the detection process can be precisely regulated and controlled, and the detection precision and stability are improved. The method solves the problems of poor probe stability, low quantum yield and high detection limit in a traditional fluorescence detection method, has the advantages of high detection speed, high specificity and wide application range, and can be widely applied to the fields of food safety detection, environmental pollutant monitoring, biomedical diagnosis and the like.

The application provides a fluorescent imaging probe based on a covalent organic framework, a preparation method and application. The fluorescent imaging probe is successfully prepared by the preparation method, the fluorescent intensity of the fluorescent imaging probe has a good linear relationship with the concentration of iron ions, the fluorescent imaging probe can be used for detecting the concentration of iron ions, and the fluorescent imaging probe has excellent biocompatibility and can be used for in vivo fluorescent imaging.

The invention belongs to the technical field of material science, and particularly relates to a rare-earth-based fluorine cluster for magnetic resonance imaging and cell imaging and a preparation method and application of the rare-earth-based fluorine cluster. The molecular formula of the rare earth based fluorine cluster is [(RE24 (3-F) 22 (OH) 6 (tBuCOO) 21 (Hdmpa) 11 (H2dmpa) 7CH3OH CH3CN], RE is a rare earth element, BuCOOH is trimethyl acetic acid, H3dmpa is a 2, 2-bis (hydroxymethyl) propionic acid ligand, and OH and 3-F are in a bridging mode of fluorine ions. The rare earth-based fluorine cluster provided by the invention has excellent thermal stability and solution stability, and the gadolinium-based cluster compound shows longitudinal relaxation efficiency superior to that of a commercial contrast agent Gd-DTPA; the material has good corrosion resistance, is easy to process and form, can stably exist at 300 DEG C due to good thermal stability, and the introduction of fluorine ions in the structure can enhance the quantum yield of europium and terbium group clusters.

This invention discloses BODIPY dyes, their preparation methods, and their applications in latent fingerprint recognition. The invention prepares four BODIPY dyes with different structures and emission colors, all exhibiting high fluorescence quantum yields (over 55% absolute fluorescence quantum yield) and excellent lipophilicity. Using a spray method, latent fingerprints on different substrates can be efficiently and conveniently detected within 10 seconds. Furthermore, the detection solution demonstrates excellent stability, can be stored for up to 30 days, and achieves a color change from green to red through modulation. This modulation effectively addresses complex background colors, ensuring optimal latent fingerprint detection results under various color backgrounds.

The invention discloses a preparation method of an InP quantum dot based on silicon-based phosphine salt and the InP quantum dot prepared by the preparation method. The preparation method comprises the following steps: stirring and reacting an indium precursor, silicon-based phosphonium salt MP (TMS) 2 and a selectively added first zinc precursor in a solvent in an inert atmosphere at 150-220 DEG C to obtain a solution containing an InP nanocrystal nucleus, then heating to 240-310 DEG C, adding one or more of a second zinc precursor, a selenium precursor and a sulfur precursor, coating the InP nanocrystal nucleus with a shell layer, and carrying out vacuum drying to obtain the indium-selenium-sulfur-doped InP nanocrystal. The shell layer contains one or more of a zinc element, a selenium element and a sulfur element; m in the silicon-based phosphine salt MP (TMS) 2 is K, Na or Li, and TMS is [-Si (CH3) 3].

The invention discloses a light conversion microsphere with adjustable emission wavelength and high quantum yield, a preparation method and application. Maleic anhydride copolymer microspheres are prepared through a self-stabilization precipitation polymerization method; the invention relates to a light conversion microsphere with adjustable emission wavelength and high quantum yield. A maleic anhydride copolymer microsphere is subjected to amine treatment to prepare an aminated polymer microsphere. And inducing intramolecular cyclization of the microspheres through simple heat treatment to obtain the maleimide-based polymer microspheres with adjustable emission wavelength. And finally, blending the prepared microspheres with a polymer matrix to prepare the light conversion film. The light conversion microspheres have the advantages of high luminous efficiency, adjustable luminous wavelength and the like, and the prepared polymer composite film can convert harmful ultraviolet rays into blue light or red light beneficial to plant growth and development and is used in the field of agricultural light conversion films; the material can also be compounded to the surface of a solar cell, optimizes the solar spectrum, and converts high-energy ultraviolet rays into effective wave bands absorbed by the solar cell, thereby improving the energy conversion efficiency of the solar cell.

This invention discloses a color-tunable room-temperature phosphorescent carbon dot composite material based on minoxidil, its preparation method, and its applications. The composite material is synthesized in situ through a one-step thermal treatment of the clinical drug minoxidil (MND) and boric acid (BA) in an aqueous phase. Minoxidil, as a carboxyl-free aminopyrimidine molecule, partially forms nitrogen-doped carbon dots during pyrolysis, while some exist in an incompletely carbonized molecular state. Both are firmly anchored in a BA-derived rigid borosilicate glass matrix via B–N covalent bonds, effectively suppressing nonradiative transitions of triplet excitons. By controlling the doping amount of minoxidil (preferably an MND:BA mass ratio of 1:60 to 1:3), the phosphorescent emission color of the material can be continuously tunable from blue to green, achieving a maximum photoluminescence quantum yield of 20.9% and a room-temperature phosphorescent lifetime of up to 1.43 seconds. This composite material has significant application value in fields such as multi-level dynamic information encryption, time-resolved anti-counterfeiting, and intelligent optical devices.