65results about How to "Reduce fluorescence quenching" patented technology

The invention discloses a composite hole transport layer with a multi-layer periodic doping structure, an LED device structure and application and preparation method of the LED device structure. By doping a metal oxide material in a hole organic transport layer of a quantum-dot light emitting device, the hole transport layer (HTL) taking the doping organic layer as a structural unit and with multi-layer periodic doping is fabricated, the hole injection capability of the device is remarkably improved, so that the carrier injection balance in the device is improved. Meanwhile, the influence of the doping proportion of the metal oxide doping material in the HTL on the light emitting property of the device is symmetrically researched. The structure is not limited to a quantum-dot LED, and the device structure can be implanted to other types of photoelectric devices.

The invention provides an inorganic metal compound, a composition comprising the inorganic metal compound, a device, apparatuses, and a manufacturing method for the device. The inorganic metal compound is used for a first current carrier transport layer of a photoelectric device; the inorganic metal compound is a chelate which is obtained from inorganic semiconductor nanocrystals and a chelating agent through a chelating reaction; and first current carriers comprise electrons or holes. By adoption of the inorganic metal compound, material stability can be improved; the chelate with a stable structure is formed by virtue of matching of the chelating agent and active sites of the inorganic semiconductor nanocrystals in the chelating reaction; therefore, by lowering or inactivating the activity of the active sites on the surfaces of the inorganic semiconductor nanocrystals, the capability of accepting external electrons or holes of the active sites is lowered; the electrons or holes of a quantum dot light emitting layer cannot be extracted by the active sites easily; fluorescence quenching of the quantum dots is reduced; the problem of fluorescence quenching of a quantum dot light emitting screen easily caused by the existing inorganic current carrier transport material can be solved; and the light emitting efficiency of the photoelectric device is improved.

A method for detecting microcystin LR based on the fluorescence resonance energy transfer of a shell-core type up-conversion material and molybdenum disulfide is used for detecting the microcystin LR (MC-LR) in a practical water sample. The shell-core type up-conversion material (NaYF4:Yb, Tm@NaYF4:Yb) is prepared to improve the fluorescence intensity. After the up-conversion material is connected with the nucleic acid adaptor of the MC-LR, nucleic acid bases is adsorbed to the bottom surface of the molybdenum disulfide through Van der Waals force, the fluorescence resonance energy transfer occurs between the up-conversion material and molybdenum disulfide, and fluorescence is quenched. When the MC-LR exists in the detection process, the MC-LR specifically binds to the adaptor of the MC-LR, the conformation of the adaptor is changed, and the adaptor is separated from the bottom surface of the molybdenum disulfide to recover the fluorescence. The fluorescence intensity at 361 nm is monitored, the MC-LR is quantitatively detected, the linear range is 0.01-50 ng/ml, and the detection limit is 0.002 ng/ml. The method used for detecting the MC-LR has the advantages of high sensitivity, high specificity and good stability. A result is accurate and reliable when the method is used for detecting tap water and Taihu Lake water.

The invention belongs to the technical field of organic photoelectric materials, and particularly relates to an organic photoelectric material as well as a preparation method and application thereof.The organic photoelectric material comprises a molecular structure as shown in formula I: (shown in the description), in the formula I, R1 and R2 are respectively one of C6-C18 aryl group or C6-C18 aromatic heterocyclic group containing at least one of O, S and N. The organic photoelectric material can be effectively applied to an organic electroluminescence device, and has good luminescence performance, an asymmetric diarylamine structure facilitates the hole transportation, by introducing a butterfly-shaped group, the organic photoelectric material has good rigidness and space three-dimensional characteristics, and the stability and film forming performance of the organic photoelectric material can be improved.

The invention discloses a multi-layer planar waveguide structure of a laser and a preparation method of a multi-wavelength organic laser. The multi-layer planar waveguide structure is formed by cascade connection of at least two planar waveguide structure units; an intermediate modulation layer is arranged between the adjacent two planar waveguide structure units and is formed by a low-refractive-index super-thick transparent layer, and a high-reflectivity ultra-thin metal layer; and the intermediate modulation layer and a laser dye layer adjacent to the intermediate modulation layer form a planar waveguide unit. According to the invention, with introduction of the high-reflectivity metal layer, spontaneous radiation light is amplified and limited into the dye active layer; and the low-refractive-index super-thick transparent layer is added into the dye active layer and the metal modulation layer to reduce fluorescence quenching, and pumping energy is centralized into an optical waveguide. In order to obtain multi-waveband high-gain spontaneous radiation light amplification, the intermediate modulation layer is arranged to enable the ASE to be limited in the dye active layer; and under simulation of optical pumping, multi-waveband low-threshold laser can be obtained.

The invention discloses an organic electroluminescent material, a preparation method and an application thereof, and belongs to the technical field of organic electroluminescence. The organic electroluminescent material has the molecular structure represented as follows, wherein A is void or is a six-membered carbon ring, X is O, S or CMe2, Ar1 and Ar2 are substituted or non-substituted aryl group and substituted or non-substituted hetero-aryl group. The invention also discloses the preparation method and the application of the organic electroluminescent material. The organic electroluminescent material has good carrier transportation efficiency and thermodynamic stability, excellent film-forming property, proper molecular energy level and high luminescence efficiency, can be used as a blue light doping material and is applied in the field of organic electroluminescence.

The invention discloses novel spirobifluorene compound 2-methyl-7-benzimidazolyl spirobifluorene. The method for preparing the novel spirobifluorene compound comprises the following steps of performing coupling reaction on parabromotoluene serving as a raw material, and performing bromination, grignard reaction, dehydration cyclization and oxidizing reaction to obtain the 2-methyl-7-formacyl spirobifluorene, and reacting the 2-methyl-7-formacyl spirobifluorene with o-phenylendiamine to obtain the compound (I). The method and the compound have the advantages that raw materials are low in price and readily-available, the synthetic route is simple, the yield is high, and the method can be applied to large-scale production; because a three-dimensional rigid structure of spirobifluorene is adopted, the compound has a high yield of fluorescent quantum and fluorescence intensity; the compound has high thermal stability and high solubility; the compound can be applied to the field of electroluminescence, and when the compound is used as a luminescent layer to prepare an electroluminescent device, pure white light can be obtained; and when the compound is applied to a fluorescent ion probe, the probe has high sensitivity, can make quick response to a pH value of a solution, is a pH probe with a quite wide response range and has quite good application prospect.

The invention provides a preparation method of anthracene-doped polyphenyl acetylene-graphene OLED photoelectric particles. The method comprises grinding anthracene groups and polyphenyl acetylene under frozen conditions, during the grinding process, introducing graphene conductive agent, taking graphene as an external skeleton to form a non-coplanar scroll structure to reduce fluorescence quenching. Therefore, the high fluorescence quantum efficiency can be kept and meanwhile, the performance of the polyphenyl acetylene can be effectively regulated. The preparation method of the an anthracene-doped polyphenyl acetylene-graphene OLED photoelectric particles overcomes the intrinsic defect of crystallization proneness of small molecules such as anthracene serving as light emitting units in the prior art, increases the service life and the thermal stability of devices and is simple in synthetic processes of composite materials, low in cost of raw materials and capable of meeting the requirements of industrialized development.

The invention relates to a rapid quantitative fluorescence detection device for 3-deoxyfructose and a preparation method thereof, and belongs to the field of medical detection. The device is preparedby adhering a nitrocellulose membrane with a solid phase containing 3-deoxyfructose-carrier protein and a goat-anti-mouse IgG polyclonal antibody, glass fiber adsorbed with an immunofluorescence microsphere labeled 3-deoxyfructose antibody, a sample pad, absorbent paper and other auxiliary materials. The preparation method comprises the following steps: pretreating a nitrocellulose membrane by adopting a polyethylene glycol glycerol treatment solution; firstly combining carrier protein-3-deoxyfructose with oleic acid modified zinc sulfide nanoparticles, and then adsorbing onto a nitrocellulosemembrane; and preparing the proper buffer solution and the sample pad treatment solution. The reaction sensitivity is effectively improved on the basis of ensuring complete release of the immunofluorescence microsphere, and under the same threshold value, the dosage of the immunofluorescence microsphere can be reduced, the cost is saved, and the complexity of production operation is not increased. The test paper is high in sensitivity, strong in specificity, simple and convenient to operate, time-saving and strong in practicability.

The invention provides a POSS based polyionic liquid/rare earth fluorescent material and a preparation method thereof. The POSS based polyionic liquid/rare earth fluorescent material is characterizedby comprising POSS based polyionic liquid, wherein rare earth complexes are adsorbed around molecules of the POSS based polyionic liquid; the POSS-based polyionic liquid is obtained by the quaternaryamination reaction of a POSS-based imidazole polymer. The preparation method has strong operability, mild experimental conditions and good reproducibility. The obtained POSS based polyionic liquid/rare earth fluorescent material has stable quality and very good photothermal performance.

The invention discloses a preparation method of a thenoyltrifluoroacetone (HTTA) modified rare earth hydroxide nano-sheet fluorescence reinforcing material. The preparation method comprises the following steps of dissolving yttrium nitrate hexahydrate into deionized water firstly, then adding europium nitrate hexahydrate, and performing uniform mixing; dropwise adding dilute ammonia water, and regulating a pH value of the solution to 7.5; putting the solution in a microwave field, performing continuous microwave treatment for 20 min in the N2 protection atmosphere, performing air pump filtration, water washing and washing with ethanol on a product after microwave treatment, and then putting the product in a vacuum drying tank at the condition with the temperature being 35 DEG C for dryingand grinding to obtain a dry powdery rare earth hydroxide hydrate; and then performing ion exchange, ultrasonic treatment and modification on the dry powdery rare earth hydroxide hydrate to obtain theHTTA modified rare earth hydroxide nano-sheet fluorescence reinforcing material. According to the preparation method, by utilizing the antenna effect of a ligand, the energy absorbed by the ligand istransferred to rare earth ions, so that the fluorescence performance of a composite is improved by an order of magnitude.

The invention relates to a rare earth polyacid, organic light active molecule and layered double hydroxides composite luminous thin film and a preparation method thereof, and belongs to the technical filed of organic and inorganic composite luminous thin films. The method comprises the following steps of firstly, preparing a layered double hydroxides gel solution stripped by a formamido solution; respectively preparing rare earth polyacid and an organic molecule water solution; and using a hydrophilic substrate to carry out several times of alternative assembly in three solutions in a certain sequence to obtain the double-color organic and inorganic composite luminous thin film. The thickness of the thin film is accurately controllable at nano level, and the luminous strength is controllable through changing the number of assembly layers.

The invention discloses a fluorescent microsphere immunochromatographic test strip for detecting olaquindox residue and application thereof, the test strip can qualitatively and quantitatively detectolaquindox in water and feed, the sample pretreatment process is simple, convenient and fast, the detection time is short, and the test strip has very high precision and sensitivity; in addition, theolaquindox-resistant monoclonal antibody prepared by the invention is high in specificity; an olaquindox monoclonal antibody marked by fluorescent microspheres is adopted; the luminous intensity and the detection signal of the fluorescent microsphere can be enhanced along with the enhancement of the exciting light intensity, so that the fluorescent microsphere labeled olaquindox monoclonal antibody can effectively improve the analysis sensitivity of an immunochromatographic technique, and compared with the traditional colloidal gold immunochromatographic method, the immunochromatographic method provided by the invention has higher sensitivity; meanwhile, as the fluorescent microspheres have relatively stable morphological structures, the microspheres are uniform in granularity, good in dispersity and stability, high in luminous efficiency and good in repeatability, and dye fluorescence quenching is greatly reduced.

The invention relates to a spirofluorene dibenzacridine organic electroluminescent material and application thereof. The spirofluorene dibenzacridine organic electroluminescent material is provided with a molecular structure as shown in a formula I, wherein Ar1 and Ar2 are independently selected from hydrogen or aromatic groups. The organic electroluminescent material provided by the invention has a favorable film-forming property and a suitable molecular energy level, is capable of changing electron transition to enable a light-emitting peak position to be adjustable due to introduction of different substituent groups, and is a light-emitting material with good light-emitting efficiency.

The invention relates to a silicon oxide single-coated cesium-copper-chlorine quantum dot, and a preparation method and application thereof, and belongs to the technical field of quantum dots. A low-temperature coating technology is utilized, a precursor is utilized to capture water in air at a relatively low temperature, rapid hydrolysis is carried out, silicon oxide successfully coats the surface of the cesium-copper-chlorine quantum dot, surface defects of the cesium-copper-chlorine quantum dot can be effectively passivated through silicon oxide coating, the light-emitting quantum yield of the cesium-copper-chlorine quantum dot can be increased, and the stability of the quantum dot can also be improved. The luminous quantum yield of the silicon oxide single-coated cesium-copper-chloride quantum dot film is as high as 76%, and a white light emitting diode prepared from the silicon oxide single-coated cesium-copper-chloride quantum dot has the advantages of high luminous color rendering index, proper color temperature and the like, and is good in stability. The silicon oxide single-coated cesium-copper-chlorine quantum dot serves as a light source in visible light communication, the -3dB bandwidth of the optical fiber is 420 KHz, and bit loading in an OFDM mode reaches 4 bit/s/Hz. The method has the characteristics of good repeatability, no requirement for high-temperature and high-pressure conditions, low cost and the like, and is suitable for expanded production.