469results about How to "High fluorescence quantum efficiency" patented technology

The invention discloses a 1,3,5-triazine derivative. The derivative is a compound with a structure of a formula I. The compound of the formula I can emit high-efficiency blue fluorescence and meanwhile has higher triplet state energy; so that the compound of the formula 1 can sensitize green and red phosphorescent doped materials while emitting the high-efficiency blue fluorescence, so that the technological conditions for preparing WOLEDs (White Organic Light Emitting Diode) are met. Meanwhile, the invention also discloses a preparation method of the compound of the formula 1 and application in preparation of the white light organic electroluminescent diode.

The invention discloses a preparation method and application in the luminescent element thereof of CuInS2-ZnS/ZnSe/ZnS semiconductor quantum dots with a core-shell structure, belonging to the technical field of the preparation method of the semiconductor quantum dot. The method comprises the following steps: dissolving the precursors of copper source, zinc source, indium source and sulfur source in nonpolar mixed solvent to perform nucleation and growth under a certain temperature and obtain a CuInS2-ZnS alloy core-ZCIS, then adding zinc source and selenium source alternately in the solution to perform epitaxial growth of ZnSe on the core, then perform epitaxial growth of ZnS to prepare the CuInS2-ZnS/ZnSe/ZnS quantum dots, finally adding polar solvent in the solution, settling, centrifuging, cleaning, and perform vacuum drying to obtain solid quantum dot powder. The prepared quantum dots are 2-8nm and have uniform particle size, controllable emission wavelength and high yield. The quantum dots are used as luminescent material to prepare red, yellow and green quantum dot luminescent elements and the luminescent elements have excellent luminescent property.

The invention discloses application of a multifunctional carbon quantum dot taken as a fluorescent whitening agent in the fields of spinning printing and dyeing, washing agents, papermaking, plastics, leathers or coatings and the like. The carbon quantum dot disclosed by the invention has the advantages of wide application field, good whitening effect and good light resistance, is innoxious and environmentally friendly, can be applied to the fields of spinning printing and dyeing, washing agents, papermaking, plastics, leathers or coatings and the like, and can generate unforeseeable technical effect because the carbon quantum dot can generate active oxygen free radicals under the condition of illumination, wherein the unforeseeable technical effect is as follows: the bacteria attached to the surfaces of spinning printing and dyeing materials, the washing agents, paper sheets, the plastics, the leathers or the coatings and the like can be effectively killed after the spinning printing and dyeing materials, the washing agents, paper sheets, the plastics, the leathers or the coatings and the like which are doped with the carbon quantum dot absorb ultraviolet light.

The invention discloses a fluorescent probe: a benzothiazole-terpyridine compound used for distinguishing and detecting zinc ions and cadmium ions. The probe has a structural formula as shown in (I). The compound is prepared by using bromobenzaldehyde and O-aminothiophenol as raw materials, and performing a dehydration cyclization reaction, a coupling reaction and a terpyridine derivative reaction. According to the invention, the raw materials are cheap and easily available, a synthesis route is simple, a yield is relatively high, and the fluorescent probe is high in fluorescence quantum efficiency, and relatively high in heat stability and dissolvability. The probe uses a photoinduced charge transfer mechanism, has different luminescence response for the zinc ions and the cadmium ions, has characteristics of rapid response, high sensitivity and high selectivity, is suitable for food safety inspection, laboratory safety inspection, and especially industrial wastewater monitoring, and has a wide application prospect in environment monitoring, ecological protection, disease diagnosis, industrial production and sewage inspection.

The invention discloses a benzothiazole-aniline compound used as a pH fluorescent probe and a preparation method thereof. The structural formula is shown as a chemical formula (shown in the description) (I), wherein in the formula, R1 is vinyl, acetenyl, styryl, phenylethynyl, biphenyl or perylene base; and R2 and R3 are both hydrogen, methyl or ethyl alkane. The preparation method comprises the following steps of: taking p-bromobenzaldehyde and 2-aminothiophenol as raw materials, and connecting with iodine-containing nitrobenzene derivative through dehydration cyclization reaction and coupling reaction; and generating the pH fluorescent probe benzothiazole-aniline derivative through reductive amination. Rigid structures, such as benzothiazole and phenylethynyl, are introduced into the fluorescent probe; the fluorescent probe is high in fluorescence quantum efficiency, and high in thermal stability and solubility. The probe can detect pH value under strong acid condition by adopting a photoinduced charge transfer mechanism and a conjugate passivation mechanism; and the probe has the characteristics of rapid response, high sensitivity and high selectivity, and has wide application prospect in environment monitoring, ecological protection, disease diagnosis, industrial production and sewage inspection.

The invention relates to a new compound and an organic electroluminescent device containing the compound. The structural formula of the compound is shown as below, Ar₁ and Ar₂ are respectively and independently selected from substituted or unsubstituted aromatic group, aromatic ethylene group, polycyclic aromatic group, polycyclic aromatic ethylene group, aromatic amine group and a polycyclic compound containing nitrogen atoms or a heterocyclic compound containing nitrogen atoms. The invention resolves the problems existing in the colorimetric purity, luminescent efficiency, etc. of the currently used luminescent materials. The material of the invention can be used as a luminescent material, and the electroluminescent device prepared of the material of the invention has the predominant performances of high colorimetric purity, high brightness and high efficiency.

The invention discloses a compound taking triazine as a core and an application of the compound on an organic electroluminescent device. The compound takes triazine as the core, which has the characteristics of difficult crystallization among molecules, difficult aggregation and good film forming ability. When the compound is taken as a luminescent layer main material of the organic electroluminescent device for usage, current efficiency, power efficiency and external quantum efficiency of the device are greatly improved; at the same time, the device life can be obviously increased.

The invention relates to a novel red BODIPY fluorescent dye with the chemical formula of C10+mH7+nBF2N2+xOy, wherein m, n, x and y are integers from 0 to 100. The preparation method comprises the following steps: dissolving pyrrole with substituent groups R1, R2 and R3 in an organic solution; adding ethyl glyoxylate together with nitrogen to the organic solution for a chemical reaction by using trifluoroacetic acid or toluenesulfonic acid as a catalyst; adding 2,3-dichloro-5,6-dicyano-1,4-benzoquinone oxidative dehydrogenation; and adding organic amine and a boron trifluoride diethyl ether solution for another reaction. After the reaction solution is concentrated, chromatography is performed with a silicagel column to obtain the fluorescent dye. The fluorescent dye can be used for cell imaging, fluorescent probe or laser dye. The fluorescent dye has the advantages that the ultraviolet-visible absorption spectrum and the fluorescence emission spectrum of the fluorescent dye are narrow; fluorescent quanta has high efficiency and good light stability; and the fluorescent dye has simple molecular structure and can be synthesized easily, so as to facilitate popularization and application.

The invention discloses a phosphine-containing benzophenone organic light-emitting material, a synthesis method and applications thereof, wherein the molecular general formula is Ar-Ar'-R, Ar is a phosphine-containing functional group, Ar' is benzophenone, and R is alkane, halogen, aromatic ring or aromatic heterocyclic substituent, and the like. According to the present invention, the synthesis method has advantages of simple process and easy purification, and the synthesized light-emitting material has good electron transmission performance and high fluorescence quantum efficiency, is suitable for preparing the light-emitting layer or electron transmission layer in organic electroluminescent devices, and can further be adopted as the light-emitting material and the electron transmission material in OLEDs, wherein the two layers in the classic OLEDs structure are integrated into one layer so as to simplify the OLEDs device structure and the preparation process; and the light-emitting material of the present invention specifically responds to oxygen, metal ions and the like, and is suitable for use in chemical detection, biological detection, biological imaging, anti-counterfeiting, and other fields.

The invention belongs to the technical field of organic electroluminescent display, and particularly relates to coumarin derivates, a preparation method thereof and application thereof in a white-light organic electroluminescent device. The coumarin derivates are in any one structure as disclosed in the specification. The coumarin derivate materials provided by the invention can efficiently emit blue fluorescence, and have high color purity, high fluorescence quantum yield, high electroluminescence efficiency and favorable film-forming performance; and the synthesis and purification method ofthe coumarin derivate materials is simple and suitable for mass production. The coumarin derivate materials provided by the invention have a high triplet-state energy level (higher than 2.4eV), and can simultaneously sensitize green and red phosphorescent doped materials. The coumarin derivate materials provided by the invention can be used as main materials in illuminant materials and/or luminescent layers in the organic electroluminescent device and used for preparing the organic electroluminescent device.

The invention discloses a perovskite quantum dot film and a preparation method thereof, and a device. The preparation method of the perovskite quantum dot film comprises the following steps of: dissolving AX, BX2 and a short-chain organic ligand in a solvent to obtain a perovskite ABX3 precursor solution, wherein A is a metal cation or an alkylammonium ion, B is a divalent metal cation, and X is ahalogen anion; in the spin-coating process, combining an anti-solvent method for in-situ growth of a perovskite quantum dot film, and performing heating annealing. The perovskite quantum dot film anda preparation method thereof, and the device have the advantages that the perovskite quantum dots grow in situ in the spin-coating preparation process of the thin film, the thin film is good in film-forming property, high in fluorescence quantum efficiency, simple in preparation process and adjustable in light-emitting wavelength, and short-chain organic ligands can be adopted, so that the conductivity of the quantum dot thin film is improved, and the preparation method is beneficial to preparation of a more efficient and stable perovskite light-emitting diode.

The invention discloses a compound containing ketone and heterocyclic nitrogen and application thereof to an organic light-emitting device. The compound has the advantages of being not subjected to crystallization and aggregation easily and having good film-forming property, and rigid groups in molecules can improve heat stability of a material. The compound serving as a light-emitting layer material is applied to an organic light-emitting diode (OLED), and a manufactured OLED device has good photoelectric property and can meet the requirements of panel manufacturing enterprises.

The invention relates to a boron-containing organic compound and application of the boron-containing organic compound to an OLED device. The structure of the compound is shown as a general formula (1), the whole molecule of the compound is a large rigid structure, and the introduction of substituent groups reduces the planarity of a material, so the steric hindrance of the material is increased, the material is not easy to rotate, and a three-dimensional space structure is more stable; and therefore, the compound has higher glass transition temperature and molecular thermal stability. In addition, the HOMO and LUMO distribution positions of the compound are separated from each other, so the compound has appropriate HOMO and LUMO energy levels; and therefore, after the compound is applied to the OLED device, the luminous efficiency of the device can be effectively improved, and the service life of the device can be effectively prolonged.

The invention discloses a carbon quantum dot solution which contains carboxyl and emits reddish orange fluorescent light and a preparing method thereof and relates to the technical field of quantum dot luminescence. The carbon quantum dot solution which contains carboxyl and emits reddish orange fluorescent light and the preparing method thereof aim to solve the problems of existing red-light-emitting materials that quantum efficiency is low, service life is short, and color purity is low, and the problems of existing red-light-emitting material preparing methods that complexity is high and cost is high. Maleic anhydride and o-phenylenediamine are dissolved in absolute ethyl alcohol and placed in a polytetrafluoroethylene reaction still; ultrasonic treatment and stirring are conducted in sequence; the reaction still is placed in a steel kettle, heating and natural cooling are conducted, and then a reactant is taken out after temperature is reduced to be room temperature; the reactant is filtered, and then the carbon quantum dot solution which contains carboxyl and emits reddish orange fluorescent light is obtained. The method is simple, easy to operate, low in cost and high in yield. The carbon quantum dot solution obtained with the method is high in fluorescence quantum efficiency, high in stability, capable of being placed in the air for a long time, and high in color purity. The carbon quantum dot solution is suitable for serving as a red-light-emitting material, and the method is suitable for preparing the carbon quantum dot solution which emits reddish orange fluorescent light.