47results about How to "Reduce quenching effect" patented technology

The invention relates to an organic light-emitting device taking an exciplex as a main body material, in particular to an organic light-emitting device containing the main body material and a fluorescent material, wherein the main body material comprises a first organic compound and a second organic compound, a mixture or an interface formed by the first organic compound and the second organic compound generates the exciplex under the condition of optical excitation or electric field excitation, and the emission spectrum of the formed exciplex and the absorption spectrum of the fluorescent doped material are effectively overlapped to form the effective energy transfer; the first organic compound and the second organic compound have the different carrier transport characteristics, wherein the fluorescent material is an organic compound containing the boron atoms. The organic light-emitting device prepared by the method has the characteristics of high efficiency and long service life.

The present invention relates to 4,4'-substituted spirobifluorenes, which, because of excellent properties, are suitable as functional materials for organic electroluminescent devices. In addition, the present invention relates to a process for producing 4,4'-substituted spirobifluorenes and the use of these compounds in organic electroluminescent devices.

There is provided a spark section (80) of needle-like shape protruding from an inner surface (33) of a ground electrode (30) to define a spark gap between the spark section and an electrode tip on a center electrode. The spark section (80) has a noble metal member (81) and an intermediate member (86) joined to each other. The materials of the noble metal member (81) and the intermediate member (86) are selected in such a manner that the thermal conductivity of the intermediate member (86) is lower than that of the noble metal member (81). This limits heat radiation through the heat radiation passage from the noble metal member (81) through the intermediate member (86) to the ground electrode (30) so as to maintain the noble metal member (81) at a higher temperature than conventional types and reduce a quenching effect of the noble metal member (81) on a flame core generated in the spark gap for improvement in ignition performance.

The invention relates to a fluorescent microsphere marker and a preparation method thereof. The invention aims to provide a fluorescent microsphere marker. Compared with the traditional fluorescent marker, the fluorescent microsphere marker disclosed by the invention has the advantages of higher fluorescence intensity and higher stability, is easier to mark and is simpler to prepare. The technical scheme of the fluorescent microsphere marker is to provide the fluorescent microsphere marker. The fluorescent microsphere marker comprises a carrier, wherein the carrier is a microsphere polymerized by a styrene monomer, and the microsphere is connected with a fluorescence complex. The fluorescent microsphere marker disclosed by the invention has the beneficial effects that the preparation method is simpler and easier because the microsphere polymerized by the styrene monomer is used as the carrier. The microsphere disclosed by the invention not only can be used for marking the rare earth fluorescence complex but also can be used for marking common fluorescence substance, such as FITC (fluorescein isothiocyanate), the microsphere with various fluorescence properties can be manufactured, and the requirement of multiple detection can be satisfied.

The invention belongs to the technical field of nano-biomaterials and particularly provides a high-efficient anti-quenching neodymium-doped rare earth infrared fluorescent probe and a synthetic method thereof. The fluorescent probe is a nano-crystal in a core-shell structure and includes two parts: a down-conversion luminescent core and an inert shell layer, wherein the down-conversion luminescent core is a neodymium-doped rare earth nano-crystal and is totally coated with the inert shell layer for enhancing a luminescent stability and a luminescent efficiency of the nano-crystal. In the invention, a high-boiling-point solution and a sodium/potassium/lithium/barium trifluoroacetate solution are employed as precursors and a shell-layer precursor solution is introduced at a high temperature in a continuously alternate manner for achieving layer-by-layer coating of the neodymium-doped nano-crystal nucleus. By means of control of the amount of the shell-layer precursor dropwisely added every time, continuous adjustment of thickness of the shell layer is achieved. In the invention, the synthetic method can improve down-conversion luminescent quantum yield and the luminescent stability of neodymium and can reduce a quenching effect of down-conversion luminescence doped by neodymium ions due to environment.

Methods for determining bacterial identity and susceptibility or resistance to antibiotic or antimicrobial agents are provided. In one embodiment, the bacteria is cultured in the presence or absence or the antibiotic agent to generate a plurality of primary cultures, which are then cultured in the presence or absence of transforming phages to generate a first secondary culture that comprise transformed bacteria that have been treated with the antibiotic agent and a second secondary culture that comprises transformed bacteria that have not been treated with the antibiotic agent. The recombinant phages are specific to the bacteria and comprise a heterologous marker. The susceptibility or resistance of the bacteria to the antibiotic or antimicrobial agent is determined by comparing a level or activity of the marker in the first and second secondary cultures.

The invention relates to an organic electroluminescent device based on an exciplex and excimer system. A light emitting layer host material includes first, second and third organic compounds. A mixture or lamination interface formed by the first organic matter and the second organic matter generates an exciplex under optical or electric excitation. The third organic compound is doped in a mixtureformed by the first organic compound and the second organic compound or a layer of a laminated interface, and the third organic compound forms an excimer. The singlet energy level of the exciplex is higher than that of the third organic compound, and the triplet energy level of the exciplex is higher than that of the third organic compound. The singlet energy level of the excimer is higher than that of the object material, and the triplet energy level of the excimer is higher than that of the object material. The first organic compound and the second organic compound have different carrier transport characteristics, and the object doping material is a fluorescent compound. The device has the characteristics of high efficiency and long service life.

The embodiments of the invention disclose a hollow white composite quantum dot preparation method, a display panel and a display device. In the preparation method, unicolor quantum dots of different colors are prepared into corresponding unicolor quantum dot emulsions through an emulsion polymerization technique, dissolved silicon dioxide nano particles are used as a seed solution, the individual unicolor quantum dot emulsions are dropped in the seed solution in sequence, such that the surfaces of the silicon dioxide nano particles are coated with the unicolor quantum dots in the individual unicolor quantum dot emulsions in sequence according to the dropping order so as to obtain white composite quantum dots, and finally, the silicon dioxide nano particles in the white composite quantum dots are removed to obtain hollow white composite quantum dots. The hollow white composite quantum dot particles obtained by the preparation method are controllable in particle size and uniform in size, and the problems of low quantum efficiency, poor stability of quantum dots, and the like are solved; besides, the color gamut of the hollow white composite quantum dots can be adjusted, so that the applicability is high, and the application range is wide; in addition, the preparation method is simple, and a batch production is facilitated.

The invention provides an organic compound containing a condensed ring structure as shown in a formula I which is described in the specification. The invention also provides an application of the organic compound in an electroluminescent device. Compared with organic compounds in the prior art, the organic compound containing the condensed ring structure has a narrower half-peak width of an emission peak, so that the organic compound has excellent color purity; when the organic compound containing the condensed ring structure is applied to an AMOLED top emission screen body, higher luminous efficiency can be achieved, and an organic light-emitting device can have lower driving voltage and longer service lifetime.

The invention discloses a dipyridine phenazinyl red/orange photothermal excitation delayed fluorescence material as well as a synthesis method and the application thereof. The invention relates to a fluorescence material as well as the synthesis method and the application thereof. The invention aims at solving the problems of concentration quenching, extremely-low efficiency and fast attenuation of electroluminescent devices due to high molecular polarity in an existing red/orange light TADF material. The structure of the material is as shown in the specification. The synthesis method comprises the following steps: preparing (6-(4-(diphenyl amino) phenyl) benzo[c][1,2,5] thiadiazole-5-yl) diphenylphosphine oxide or (7-(4-(diphenyl amino) phenyl) benzo[c][1,2,5]thiadiazole-4-yl) diphenylphosphine oxide; preparing the required donor; and obtaining a final product. The material disclosed by the invention has the advantages that the efficiency of an electroluminescent device is obviously improved, the quenching effect is reduced and the efficiency stability of the electroluminescent device is enhanced. The invention belongs to the preparation field of fluorescent materials.

A method for detecting and quantifying additives in a complex aqueous fluid, and a method for detecting an inhibitor of mineral deposition or corrosion, injected in a gas or oil well. The invention also relates to a developer solution including a lanthanide and a chelating agent for detecting said additives or inhibitors.

The invention provides a cyano quinoxaline red light thermal excitation delayed fluorescence material. The efficient red light TADF material is prepared by designing a molecular structure, modifying molecules with aromatic amine groups or aromatic phosphine oxide groups, improving the carrier transmission capability and inhibiting the intermolecular interaction on the premise of not influencing the emission wavelength of the material and adjusting the molecular configuration, electrical properties and the like of the material. Therefore, the electro-red light device with excellent comprehensive performance is obtained.

The invention relates to a thermally excited delayed fluorescent material, and a synthesis method and an application thereof, and concretely relates to a phosphonooxy-modified dipyridophenazine-based red/near-infrared thermally excited delayed fluorescent material, and a synthesis method and an application thereof. The purpose of the invention is to solve the problem of concentration quenching caused by large molecular polarity of existing problems of red/near-infrared TADF materials and the problems of low efficiency and fast attenuation of electroluminescent devices. The structural formula of the material is shown in the description. The synthesis method comprises the following steps: 1, preparing an intermediate; 2, taking and mixing the intermediate, palladium acetate, sodium acetate, diphenylphosphine and N,N-dimethylformamide, reacting the obtained mixture at 150 DEG C for 48 h, oxidizing the obtained reaction product, extracting the oxidized reaction product with water and dichloromethane, mixing obtained organic layers, drying the organic layer mixture to remove the organic solvent, and purifying the obtained product to obtain the phosphonooxy-modified dipyridophenazine-based red/near-infrared thermally excited delayed fluorescent material. The material of the invention significantly improves the efficiency of electroluminescent devices, reduces the quenching effect, and enhances the efficiency stability of the electroluminescent devices. The invention belongs to the field of preparation of fluorescent materials.

The present invention relates to a thermal activation delayed fluorescence organic light-emitting device. The device comprises a light emitting layer comprising at least one first organic compound andat least one second organic compound as the subject materials and a phosphorescent compound or a fluorescent compound as an object material. The organic light-emitting device provided by the invention has the advantages of high light-emitting efficiency and low roll-off efficiency.

The invention provides a preparation method of a composite Au nano particle, and relates to the field of material chemistry and biological nano medicines. The preparation method comprises the following steps: (1) mixing AlCl3, UCNPs and diethyl ether to obtain a diethyl ether solution in which the AlCl3 is adsorbed on the surface of the UCNPs; (2) dropwise adding ammonia water into the diethyl ether solution in which the AlCl3 is adsorbed on the surface of the UCNPs, obtained in Step (1), so as to obtain a UCNP@Al(OH)3 core-shell structure; (3) mixing the UCNP@Al(OH)3 core-shell structure obtained in Step (2) with alendronate sodium and HAuCl4 for precipitation reaction, thus obtaining a precipitation product; and (4) mixing the precipitation product obtained in Step (3) with a reducer forredox reaction, thus obtaining the UCNP@Al(OH)3/Au nano particle. The composite Au nano particle provided by the invention is excellent in water solubility and has efficient photo-thermal performance.

The invention provides a processing method of an aluminum profile for a passenger vehicle. The processing method comprises the following steps: selecting an Al-Mg-Si series aluminum alloy ingot with the weight percentage of Mg being 0.5-1.1%, the weight percentage of Si being 0.4-0.8% and the weight percentage of Fe being less than 0.6% as an extrusion raw material of the aluminum profile; raw material selection and provided extrusion parameters are reasonable, during extrusion, metal flow is uniform, efficient and rapid, the machining range is wide, the aluminum profile extrusion device can be suitable for machining aluminum profiles of passenger vehicles with various sections and sizes, and the extruded aluminum profiles are fine in crystal grain, high in straightness, good in strength, stable in performance and high in rate of finished products. According to the provided combined online quenching method, accurate cooling control can be carried out according to the temperature and the structure state of the profile, quenching cooling is uniform, the quenching requirements of aluminum profiles with different thicknesses and complex section structures can be met, the cooling range is wide, the application range is wide, the cooling efficiency of some aluminum profiles not suitable for online quenching can also meet the online quenching requirement, and the service life of the aluminum profiles is prolonged. And the process of independent quenching can be omitted, so that the equipment investment is reduced, and the production cost is reduced.

The invention concerns a system for detecting a target nucleic acid molecule of a particular sequence in a sample, said system comprising (i) an oligonucleotide primer complementary to a said target nucleic acid molecule, which primer has no internal complementarity, is able to amplify said target sequence and carries a first label linked to said oligonucleotide at its 5′ end; and (ii) an oligonucleotide probe which carries a second label that is able to interact with said first label to produce a detectable signal, wherein the oligonucleotide probe binds an extension product of said primer such that the first and second label can interact to produce a detectable signal. Methods for using said system in particular in a nucleic acid assay, kits comprising the system and elements of it form a further aspect of the invention.