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246results about How to "High fluorescence intensity" patented technology

Alkali halide-doped perovskite light-emitting diode and fabrication method thereof

The invention relates to an alkali halide-doped perovskite light-emitting diode. The alkali halide-doped perovskite light-emitting diode comprises a substrate, a hole transmission layer, an active light-emitting layer, an electron transmission layer, an electrode modification layer and an electrode, wherein the thickness of the active light-emitting layer is 5-100 nanometers, the active light-emitting layer comprises perovskite and an alkali halide doped in the perovskite, the molecular formula of the perovskite is one or more of CsPbCl<x>Br<3-x>, CsPbBr<x>I<3-x>, MAPbCl<x>Br<3-x>, MAPbBr<x<I<3-x>, FAPbCl<x>Br<3-x> and FAPbBr<x>I<3-x>, x is equal to 0, 1, 2 or 3, and the alkali halide is one or more of LiCl, NaCl, KCl, RbCl, LiBr, NaBr, KBr, RbBr, LiI, NaI, KI and RbI. The invention also provides a fabrication method of the alkali halide-doped perovskite light-emitting diode. The fabrication method comprises the steps of forming the hole transmission layer or the electron transmissionlayer o the substrate; modifying an alkali halide-containing perovskite precursor solution used as the active light-emitting layer on the hole transmission layer of the electron transmission layer; sequentially forming the electron transmission layer, a negative electrode modification layer and a negative electrode on the active light-emitting layer or sequentially forming the hole transmission layer, a positive electrode modification layer and a positive electrode on the active light-emitting layer; and performing package.
Owner:SUZHOU UNIV

Gold nanoparticle flower or quantum dot composite probe for living cell immunofluorescent labeling and photothermal treatment

The present invention provides are a gold nanoflower structure and a preparation method therefor. The gold nanoflower structure is a gold nanoflower particle, with round-head columns being uniformly distributed at the periphery thereof, obtained by using gold octahedrons, gold balls or gold tetrahedrons as seed crystals and reducing chloroauric acid by using weak reductant in an environment of high-concentration polyvinylpyrrolidone. In addition, also provided in the present invention are a gold nanoflower/quantum dot composite probe for living cell immunofluorescent labeling and photothermal therapy, a preparation method therefor and a use thereof. In comparison with traditional probes, the probe, incorporates the features of photothermal therapy and fluorescent labeling, and is capable of killing cancer cells in an effective and directional way. Two light sources are adopted to bring a tremendous photothermal conversion efficiency and a greater enhancement on fluorescence intensity of quantum dots respectively, thus mutual interference of two effects are avoided tactfully. The coating of silicon dioxide averts the biotoxicity of the gold nanoflower and the quantum dot effectually, enabling the surface of the composite probe to be easily functionalized and also imparting an extraordinarily excellent biocompatibility to the composite probe.
Owner:THE FIRST AFFILIATED HOSPITAL OF ANHUI MEDICAL UNIV

Temperature sensor based on microstructure fibers, manufacturing method of temperature sensor, and temperature measuring device

The invention belongs to the technical field of temperature sensors and provides a temperature sensor based on microstructure fibers, the manufacturing method of the temperature sensor, and a temperature measuring device. The temperature sensor comprises at least two microstructure fibers, wherein every two adjacent microstructure fibers are connected in series through a multimode fiber. For a fiber core and a cladding of each microstructure fiber, air holes distributed in the axial direction are formed in the cladding at least. Quantum dot materials are arranged in the air holes. The wavelength of fluorescent light emitted by the quantum dot materials in a microstructure fiber is different from the wavelength of fluorescent light emitted by the quantum dot materials in another microstructure fiber. Compared with ordinary fluorescent materials, the quantum dots have the advantages of being large in excitation wavelength, adjustable in fluorescent wavelength, stable in fluorescent intensity and the like. By adding quantum dots in different types and sizes into the microstructure fibers, the microstructure fibers can be distinguished in a wavelength domain according to the fluorescent wavelengths, and quasi-distributed sensing is realized.
Owner:SHENZHEN UNIV

Fluorescent probe for detecting hydrogen sulfide in cells, method for preparing fluorescent probe and application thereof

The invention provides a fluorescent probe for detecting hydrogen sulfide in cells, a method for preparing the fluorescent probe and application thereof. A chemical structural formula of the fluorescent probe is shown. Reaction can be carried out on 2,4-dinitrofluorobenzene and reaction products of 4-ethynylbenzonitrile and 4-bromine-2-hydroxybenzaldehyde to obtain the fluorescent probe. The hydrogen sulfide in solution or the cells or organisms can be detected by the fluorescent probe by the aid of fluorescence. The fluorescent probe, the method and the application have the advantages that the fluorescent probe can be obtained by means of chemical synthesis, synthesis processes are simple and feasible, raw materials are inexpensive and are easily available, and accordingly the fluorescentprobe is low in preparation cost; the fluorescent probe is high in specificity, and interference due to other components can be prevented in detection procedures; the fluorescent probe is short in response time, high in sensitivity and excellent in fluorescence emission spectral characteristic, and the hydrogen sulfide in the cells can be quickly and accurately detected by the fluorescent probe;the fluorescent probe has a broad application prospect in research on the influence of the hydrogen sulfide in the biological cells on physiological and pathological procedures.
Owner:UNIV OF JINAN

Scintillating glass and preparation method thereof

InactiveCN101602571AGood UV transmittanceHigh fluorescence intensityQuenchingHigh concentration
The invention provides a scintillating glass and a preparation method thereof and relates to a scintillating glass adopting SnO2 as the luminescence center and a preparation method thereof. The scintillating crystal has been widely researched, but has high preparation cost and large difficulty of preparation technology. In this case, the research of the scintillating glass obtains attention, because the preparation cost of glass is much lower than that of crystal and the preparation technique is simpler. Currently, the scintillating glass adopting doped Ce as the luminescence center is more researched. But as the quenching effect of the concentration of the Ce is large, the luminous intensity is limited, and simultaneously the Ce is sensitive to matrix and can cause red shift of absorption edges, thus having influence to ultraviolet-visible permeability. While the scintillating glass adopting SnO2 as the luminescence center can make up the above defects. The SnO2 belongs to a network intermediate, can be introduced with high concentration and has higher luminous intensity; simultaneously the ultraviolet-visible permeability of the glass is good; and the introduction of tin oxide can maintain, even further improve forming ability and other physical-chemical performances of the original glass.
Owner:EAST CHINA UNIV OF SCI & TECH

Synthetic method of cadmium telluride/cadmium sulfide/zinc sulfide quantum dots

The invention relates to a synthetic method of admium telluride/cadmium sulfide/zinc sulfide quantum dots. An inner core is an admium telluride quantum dot and is coated by cadmium sulfide and zinc sulfide in sequence. The synthetic method for the quantum dots comprises the following steps of: firstly, preparing an admium telluride quantum dot with excellent fluorescent characteristic by hydrolyzing a sulfhydryl group; secondly, adding thiourea with a certain concentration into the reacted admium telluride solution, forming free suplfur ions released by slowly hydrolyzing and photolyzing thiourea and cadmium ion dangling bonds existing on the surface of the admium telluride quantum dot into bonds; generating a thin cadmium sulfide casing layer on the surface of the cadmium sulfide quantum dot; and finally adding a zinc acetate solution and a sodium sulfide solution into the admium telluride/cadmium sulfide quantum dots with nuclear shell structures and carrying out hydro-thermal growth in a polytetrafluoroethylene digestion tank to form the admium telluride/cadmium sulfide/zinc sulfide quantum dots. The quantum dots have the characteristics of high fluorescent strength, favorable stability, high quantum yield and low biotoxicity and are hopeful to be applied to the field of biomarkers instead of the traditional organic dye. The synthetic method has the advantages of simple process, convenience, low cost and strong operability.
Owner:SHANGHAI UNIV

High-fluorescence zinc ion doped carbon quantum dot with citric acid chelated zinc as precursor and preparation method of high-fluorescence zinc ion doped carbon quantum dot

InactiveCN108587618AWith excitation wavelengthIt has the phenomenon of red shift of emission wavelengthNanoopticsLuminescent compositionsChelated zincLength wave
The invention provides a high-fluorescence zinc ion doped carbon quantum dot with citric acid chelated zinc as a precursor and a preparation method of the high-fluorescence zinc ion doped carbon quantum dot. The preparation method comprises the following steps: (1) preparing a citric acid solution; (2) preparing a zinc salt solution; (3) preparing a citric acid chelated zinc precursor; (4) preparing a zinc ion doped carbon quantum dot through hydrothermal treatment; (5) purifying the zinc ion doped carbon quantum dot. According to the zinc ion doped carbon quantum dot, the fluorescence intensity of the zinc ion doped carbon quantum dot is changed along with concentration change of zinc ions, and compared with fluorescence intensity of an undoped carbon quantum dot, the fluorescence intensity of the zinc ion doped carbon quantum dot can be increased by 4-8 times, in addition, an optimal excitation wavelength and an emission wavelength both have red shift. In addition, the zinc ion dopedcarbon quantum dot provided by the invention is prepared by using a one-step hydrothermal method, has the advantages of being simple in preparation process, gentle in synthesis condition, low in cost, non-toxic and the like, and can be applied to fields such as optical devices and biological medicines.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY

Method for detecting concentration of ferrohemoglobin by using fluorescent carbon dot probe

The invention discloses a method for detecting the concentration of ferrohemoglobin by using a fluorescent carbon dot probe. The method comprises the following steps: 1, preparing different concentrations of fluorescent carbon dot-containing ferrohemoglobin standard solutions, detecting the fluorescence intensity of the standard solutions to obtain a standard solution fluorescence spectrogram, and establishing a linear relation between a difference between the fluorescence intensity of the standard solution with the ferrohemoglobin concentration being 0 and the fluorescence intensity of every standard solution and the ferrohemoglobin concentrations; and 2, preparing a fluorescent carbon dot-containing ferrohemoglobin sample solution, detecting the fluorescence intensity of the sample solution, and determining the concentration of ferrohemoglobin in the sample solution through the linear relation. The ferrohemoglobin concentration is detected by using the characteristics of a ferrohemoglobin quenching fluorescence carbon dot with the fluorescence carbon dot as a probe, so the method has the advantages of simple and convenient detection process, high sensitivity and low detection limit, and can realize online, in-situ, rapid and sensitive detection of the concentration of ferrohemoglobin in a practical sample.
Owner:GUANGXI TEACHERS EDUCATION UNIV
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