17results about How to "Long fluorescence lifetime" patented technology

The invention discloses a preparation method and application of a red fluorescent copper nano-cluster. According to the preparation method, a red fluorescent copper nano-cluster aqueous solution is prepared at room temperature by using polyvinylpyrrolidone as a protective agent, 3-mercaptophenylboronic acid as a stabilizer and a reducing agent and water-soluble copper salt as a copper source. The preparation method has the advantages of being simple in preparation process, low in instrument requirement, short in treatment time, low in cost and the like, the fluorescence quantum yield of the prepared red fluorescent copper nano-cluster is 4.9%, and the prepared red fluorescent copper nano-cluster has the advantages of being good in water solubility, good in stability, high in photobleaching resistance, high in salt resistance, long in fluorescence service life and the like, has high sensitivity and selectivity to Congo red, and is suitable for industrial production. The method can be applied to detection of fluorescence quenching type Congo red.

The invention belongs to the technical field of perovskite batteries, and particularly relates to a perovskite precursor and a preparation method thereof. According to the invention, the perovskite precursor is prepared into an emulsion form, Ge < 4 + > is adopted to prepare the perovskite precursor, and the silicon dioxide nano oxide, the additive and the stabilizer are introduced into the emulsion precursor, so that the moisture resistance and hydrophobicity of the perovskite thin film are improved, and tiny liquid drops in the emulsion are used as a template for perovskite crystal growth, so that the perovskite thin film is prepared. The size and form of perovskite crystals are controlled, the silicon dioxide nano oxide can passivate defect states on the surface of perovskite and reduce recombination of electron-hole pairs, and a precursor in the emulsion is also beneficial to passivating surface defects in the curing process, reducing defect state density and improving device performance. The device prepared by using the perovskite precursor prepared by the invention has good photoelectric property and stability.

The invention provides a rare earth complex fluorescent microsphere and a preparation method and application thereof. The preparation method comprises: (1) preparing a rare earth complex from thenoyltrifluoroacetone, europium ions, other lanthanide metal ions, sodium hydroxide, phenanthroline and an ethanol solution; (2) dissolving the obtained rare earth complex and polystyrene microspheres in dichloromethane to further prepare the rare earth complex fluorescent microspheres. The rare earth complex fluorescent microspheres synthesized by the preparation method can encapsulate tens of thousands of rare earth complex fluorescent molecules in the microspheres, and can achieve a fluorescence signal amplification effect without dissociation enhancement. The obtained microspheres have a controllable particle size range, good uniformity, monodispersity, stability and repeatability, and have important application value.

This invention discloses a manganese-containing organic-inorganic hybrid material, its preparation method, and its application. The manganese-containing organic-inorganic hybrid material is based on (C6H...) 15 ClNO)2MnBr4 indicates that the manganese-containing organic-inorganic hybrid material is a crystalline material belonging to the monoclinic crystal system with space group C2 / c and cell parameters β = 129.634(6)° and γ = 90°. The preparation method of the crystalline material of this invention is simple and convenient. The crystalline material provided by this invention can emit strong green light under ultraviolet light excitation, with a fluorescence lifetime of up to 363 μs and a quantum yield as high as 68.47%. Therefore, it can be used to fabricate photoluminescent devices and has high practicality.

The present invention relates to the technical field of electronic materials, and in particular to a metal complex and an organic electroluminescent device. The metal complex provided by the present invention has a structure as shown in Formula I: The metal complex provided by the present invention can reduce device roll-off, which is conducive to the preparation of a metal complex of a high-stability OLED device, and the metal complex is applied to an organic electroluminescent device, and the luminescent color can be adjusted and the luminescent efficiency is high.

The invention relates to rare earth element and titanium element co-doped gallium oxide fluorescent powder as well as a preparation method and application thereof. The chemical formula of the fluorescent powder is Ga2O3: xM / yTi, m is a doped rare earth element and is selected from one of Er and Eu, and x ranges from 0.005 to 0.1; ti is a doped transition metal element, and the value range of y is 0.005-0.1. When the rare earth element is Er, compared with Er element single-doped gallium oxide fluorescent powder, the Er element and Ti element co-doped gallium oxide fluorescent powder provided by the invention has the advantages that the luminous intensity of photoinduced green light and red light is respectively improved by 1900 times and 530 times, and the comprehensive performance of the fluorescent powder is remarkably improved. The preparation method provided by the invention is simple in process, the used raw materials are easy to obtain, low in price and non-toxic, and the preparation method has a relatively great application prospect.

The invention provides a bilateral SiO2-coated CsPbX3 quantum dot, a method and application, and relates to the field of nanomaterials and biosensing, Cs4PbX6 nanoparticles are added into an organic phase to obtain an organic phase dispersion liquid of the Cs4PbX6 nanoparticles; adding a silicon source into the dispersion liquid; adding an aqueous solution containing halide ions into the system, and then vigorously oscillating to initiate crystal phase transformation of Cs4PbX6 to CsPbX3 and react with the silicon source, so as to form CsPbX3 quantum dots coated with bilateral SiO2 in situ; and after standing, carrying out centrifugal separation to obtain a CsPbX3 quantum dot solution coated with bilateral SiO2. The obtained quantum dot has excellent water stability and efficient fast anion exchange (FAE) activity, the fluorescence lifetime of the quantum dot is as long as 46.44 ns, and the fluorescence intensity is only attenuated by 21.8% after the quantum dot is violently reacted with water for 60 minutes.

The invention provides a quantum dot color conversion film resistant to high blue light radiation and high temperature and a preparation method of the quantum dot color conversion film, and belongs to the technical field of color conversion films. The preparation method comprises the following steps: preparing Zn-In / La-S quantum dots, growing ZnS shells on the surfaces of the quantum dots, coating a layer of polydopamine layer to prepare modified ZnS shell-coated Zn-In / La-S quantum dots, mixing the modified ZnS shell-coated Zn-In / La-S quantum dots with graphene oxide-coated ZnCNi3 in a solvent, uniformly spin-coating a polycarbonate film, treating the other surface by the same method, and drying to prepare the quantum dot color conversion film resistant to high blue light radiation and high temperature. The quantum dot color conversion film prepared by the invention has better high blue light radiation resistance and high temperature resistance, is high in ultraviolet and blue light blocking efficiency, low in cost and good in heat resistance and chemical stability, can tolerate water and oxygen environments, and has a wide application prospect.

This invention provides a siloxane ligand-protected Ag 40 Nanoclusters, their synthesis methods, and applications. This invention relates to Ag protected by siloxane ligands. 40 Nanoclusters are composed of RC≡C ‑ and (Ph 4 Si 4 O 8 ) 4‑ Ag protected by both ligands 40 Nanoclusters, with the molecular formula {Ag} 40 [(RC≡C) 8 (Ph 4 Si 4 O 8 ) 6 The silver nanoclusters synthesized in this invention have precise atoms and novel structures; the synthesis method is simple, easy to operate, mild under mild conditions, and the raw materials are readily available, making it potential for industrial and commercial production; the obtained silver nanoclusters exhibit superior fluorescence performance at low temperatures and have a long fluorescence lifetime, making them practically valuable in the field of fluorescent probes and worthy of market promotion.

The invention discloses a preparation method of a multi-shell-coated ZnSe-based blue-violet light quantum dot, and the preparation method of the ZnSe-based blue-violet light quantum dot comprises the following steps: injecting a Se precursor solution into a first Zn precursor solution to obtain a ZnSe quantum dot crystal nucleus solution; a second Zn precursor solution is injected into the ZnSe quantum dot crystal nucleus solution, then the temperature is increased, a first coordination solvent is injected, a ZnSe / 1-Layer ZnS quantum dot solution is obtained, N-1 times of injection operation are conducted on the ZnSe / 1-Layer ZnS quantum dot solution, N is equal to 3-5, a ZnSe / N-Layer ZnS quantum dot solution is obtained, and each time of injection operation comprises the steps that a third Zn precursor solution is injected into the ZnSe / 1-Layer ZnS quantum dot solution; and purifying the ZnSe / N-Layer ZnS quantum dot solution for multiple times to obtain the ZnSe-based blue-violet light quantum dot.

The invention belongs to the field of annona squamosa pollen detection, and particularly relates to a method for rapidly detecting the vitality of annona squamosa pollen. Compared with traditional FDA-PI double staining, the mixed solution for pollen viability detection has longer fluorescence lifetime, the pollen maintains the form without bursting within a certain time, the in-vitro germination process can be continuously observed, the verification of the detection result of pollen viability is facilitated, and the accuracy of the detection result is improved. The mixed solution can count the number of pollen cell nucleuses, helps to determine the pollen development stage, can mutually verify the pollen activity detection result, is convenient to comprehensively judge the pollen activity, is higher in dyeing speed, does not have processes such as centrifugation, and is simpler and more convenient to operate.

The invention provides a rare earth complex fluorescent material as well as an ultrasonic synthesis method and application thereof, the chemical formula of the rare earth complex fluorescent material is [Tb (2-Cl-6-FBA) 3 (4-OH-terpy) (EtO)]. 0.75 EtOH, 2-Cl-6-FBA is deprotonated 2-chloro-6-fluorobenzoic acid, 4-OH-terpy is 4-hydroxy-2, 6-difluorobenzoic acid, and the rare earth complex fluorescent material is a rare earth complex fluorescent material with the chemical formula of [Tb (2-Cl-6-FBA) 3 (4-OH-terpy) (EtO)]. EtO is 1, 2 ': 6', 2 ''-terpyridyl, EtO is deprotonated ethanol, and the coordination number of the rare earth element corresponding to the rare earth complex fluorescent material is 9. The invention further discloses a method for ultrasonically synthesizing the rare earth complex fluorescent material. The rare earth complex fluorescent material has good thermal stability, excellent fluorescence performance and long fluorescence lifetime, and has good application prospects and large-scale industrial popularization potential in the fields of illumination, luminescent probes and sensors.

The application discloses a TiO2-ZnIn2S4 core-shell structure S-type heterojunction photocatalyst and a preparation method and application thereof, and relates to the field of photocatalytic materials. The TiO2-ZnIn2S4 core-shell structure S-type heterojunction photocatalyst comprises a TiO2 inner core, and a ZnIn2S4 outer shell coated outside the TiO2 inner core; the ZnIn2S4 outer shell is formed by in-situ growth of ZnIn2S4 nanosheets on the surface of the TiO2 inner core to form a three-dimensional hierarchical nanoflower structure; wherein, an S-type heterojunction is formed between the TiO2 and the ZnIn2S4. The photocatalyst realizes efficient spatial separation of photo-generated carriers through a close heterojunction interface of the core-shell structure, and meanwhile, the S-type heterojunction retains the carriers with strong oxidation-reduction capacity, so that the performance of water decomposition for hydrogen production by photocatalysis and the cycle stability are improved.

The invention relates to rare earth doped down-conversion nanoparticles, a preparation method thereof and application of the rare earth doped down-conversion nanoparticles in detection of quinolone antibiotics, and belongs to the technical field of chemical materials and food detection. The rare earth doped down-conversion nano-particle comprises an inner core, a shell and a coating layer, wherein the shell is positioned between the inner core and the coating layer; the inner core contains NaGdF4: Ce / Eu / Ca, the shell contains NaTbF4, and the coating layer contains SiO2; the NaGdF4: Ce / Eu / Ca is a material which takes NaGdF4 as a matrix and is doped with Ce, Eu and Ca. According to the invention, the hydrophilicity and dispersity of the nanoparticles are improved, and the enrichment and detection limits of norfloxacin are improved. The fluorescent probe has the characteristics of narrow-band emission, long fluorescence lifetime, excellent light and chemical stability, low biotoxicity and the like, and the detection method is simple and convenient.

The invention belongs to the technical field of lanthanide series-alginate fibers, and particularly relates to a luminous lanthanide series-alginate fiber as well as a preparation method and application thereof. Sodium alginate and LnCl3 are used as raw materials, and the composite material is prepared through a wet spinning process and has red, orange and green fluorescence emission. The preparation method comprises the following steps: putting a sodium alginate aqueous solution into a spinning injector, extruding the sodium alginate aqueous solution into a coagulating bath containing LnCl3 and 2, 2 '-dipyridyl, quickly generating hydrogel fibers after the spinning solution is in contact with the coagulating bath, taking the fibers out of the coagulating bath, and air-drying the fibers at normal temperature to obtain the lanthanide-alginate fibers. The lanthanide-alginate fiber disclosed by the invention can emit red, orange and green fluorescence according to different doping proportions of lanthanide elements, has good formability, thermal stability and homogeneity, and shows huge application potential in the field of flexible anti-counterfeiting.

The invention provides an application of Mn-RuO2 in preparation of a medicine for treating cancer, wherein the cancer is pancreatic cancer. A photoelectrochemical test system proves that Mn-RuO2 has the performance expressions of remarkable fluorescence quenching, longest fluorescence lifetime, relatively low charge transfer resistance and strong photocurrent response, and shows that Mn-RuO2 has excellent carrier separation efficiency and low recombination efficiency. Under ultrasonic irradiation, Mn-RuO2 can effectively improve the hypoxic environment and enhance ROS generation, meanwhile, programmed para-apoptosis and pan-apoptosis signal channels in tumor cells are activated, and the synergistically enhanced anti-tumor effect is shown.