7results about How to "High Luminous Quantum Efficiency" patented technology

The invention discloses a gallium germanate near-infrared luminescent material, a preparation method and an LED light-emitting device. The general chemical formula of the luminescent material is Ca3Sn2Ga2GeO12: xFe < 3 + > (0lt; x is greater than or equal to 0.10), can be effectively excited by an ultraviolet or blue light band light source and emits high-intensity near-infrared light covering a range from far-infrared light to near-infrared light of 650-1000nm, and has very excellent light-emitting quantum efficiency (greater than 50%) and thermal stability (greater than 70% at 423K) compared with materials of the same type. The preparation method of the luminescent material is simple in process and environment-friendly, and the obtained product is pure in phase and stable in physicochemical property. The infrared LED light-emitting device formed by combining the light-emitting material and a commercial LED chip is excellent in light-emitting intensity, energy conversion efficiency and the like, and has wide application potential in the fields of near-infrared night vision, non-contact detection, food analysis, information anti-counterfeiting and the like.

The invention discloses a carbonyl condensed boron heterocyclic compound as well as a preparation method and application thereof. The structural general formula of the carbonyl fused boron heterocyclic compound is # imgabs0 #, Ar1, Ar2, Ar3, Ar4 and Ar5 are respectively and independently selected from one of C6-C60 aromatic rings and C3-C60 heteroaromatic rings, X1, X2, X3 and X4 are respectively and independently selected from one of alkyl nitrogen, aryl nitrogen, nitrogen, oxygen, sulfur, selenium, carbonyl, sulfoxide, sulfuryl and phosphorus oxygen, and dotted lines are bonded or not bonded. The carbonyl condensed boron heterocyclic compound provided by the invention is a long-wavelength luminescence MR-TADF material with a large anti-intersystem crossing rate, and a device prepared from the material has excellent luminescence performance and good stability, and is suitable for large-scale application in the field of electroluminescence.

The present invention relates to the technical field of quantum dot light-converting agricultural film, and in particular to a rare earth-doped quantum dot composite light-converting agricultural film and a preparation method thereof. The light-converting agricultural film comprises a light-converting masterbatch with a mass fraction of 0.2-5% and a polymer matrix with a mass fraction of 95-99.8%; the light-converting masterbatch comprises a red quantum dot light-converting agent with a mass fraction of 10-50%, a green rare earth light-converting agent with a mass fraction of 1-5%, an auxiliary agent with a mass fraction of 1-10%, and a masterbatch matrix, and the red quantum dot light-converting agent is at least one of perovskite quantum dots, II-VI group quantum dots, III-V group quantum dots, IV-VI group quantum dots, carbon quantum dots, and silicon quantum dots; and the green rare earth light-converting agent comprises at least one of Tb, Dy, Ce, Ho, and Pr elements. The advantage is that by adding green rare earth materials, the green rare earth materials absorb energy under the irradiation of sunlight and transfer the energy to the red light quantum dots, thereby enhancing the luminous intensity of the quantum dots.

The application discloses a kind of multispectral nanocluster doped multiple coating light concentrator and its method, including preparation substrate layer, preparation light emitting layer and preparation anti-reflection function layer, multispectral nanocluster doped light emitting layer is coated on substrate layer, anti-reflection function layer is coated on light emitting layer, the multispectral nanocluster is using Eu 3+ 、Tb 3+ 、Ce 3+ Ion or any combination thereof induced nanocluster of agglomerated polymer formation, the light emitting layer is obtained using multispectral nanocluster doped resin, for the absorption of incident short-wave light and conversion into characteristic emission light;The anti-reflection function layer is coupled to the outermost layer of light emitting coating, for limiting the light quantum conduction in coating, using different refractive index coating to limit the light quantum conduction in coating, to lock the fluorescent light quantum escape emitted by inner layer light emitting material, while, also can play the role of reducing interface reflection loss and improving the injection efficiency of incident light to light emitting layer.

This invention discloses a method for preparing polycrystalline fluoride composites through template-based slow-release in-situ molding, belonging to the field of inorganic luminescent functional materials technology. The method includes: providing raw materials, including at least one bulk material as a template, with the raw materials collectively providing A, B, and M ions; mixing the raw materials in a solvent and maintaining the reaction temperature for a specified time, allowing the template to slowly dissolve and release ions; the ions provided by the raw materials react with fluoride ions provided by the solvent and / or the raw materials to grow fluoride crystals in situ on the template surface, with the crystals interpenetrating and fusing to form a polycrystalline composite; after the reaction, the product is obtained by washing and drying. This invention eliminates the need for tableting, high-temperature sintering, and organic binders, and can generate polycrystalline fluorescent fluoride composites of predetermined sizes in a single self-stacking process, avoiding the defects of powder breakage and high-temperature degradation of luminescent ions in traditional two-step methods. It features high luminescence quantum efficiency, a simple process, and ease of industrial production.

The patent application discloses an aryl boron-nitrogen narrow-band blue light compound and a preparation method and application thereof. The patent application forms an organic light-emitting material with synergistic effect of short-range charge and long-range charge transfer state by introducing different electron-donating or electron-withdrawing groups into the aryl boron-nitrogen peripheral ether bond, realizes the simplification of the device structure and the improvement of the performance and the life. The patent application also discloses a preparation method and application of the material. The aryl boron-nitrogen narrow-band blue light compound can be used as a novel light-emitting molecule with high performance, high color purity and high quantum efficiency. The aryl boron-nitrogen narrow-band blue light compound has great application potential in the preparation of light-emitting materials, light-emitting devices or intelligent materials and the like, and has a significant and clear prospect in the field of display technology and solid-state lighting.

The application relates to the technical field of detection, in particular to a lead halide perovskite quantum dot material and a preparation method and application thereof. The method comprises the following steps: mixing a lead source, 1-octadecene, oleylamine, oleic acid and a cesium source, and then carrying out ultrasonic treatment to obtain a mixed solution; placing the mixed solution in a tip ultrasonic instrument, first activating at low power, then improving the power to carry out ultrasonic synthesis reaction, washing the obtained product with a first organic solvent, dispersing the product in a second organic solvent, adding a surfactant, again carrying out ultrasonic treatment and tip ultrasonic activation, and finally preparing the lead halide perovskite quantum dot material. The lead halide perovskite quantum dot CsPbX3 (X is Cl, Br or I) material obtained by the method has excellent quantum dot luminescence performance, good stability in a reverse microemulsion system, can introduce a to-be-detected substance, and realizes quantitative analysis through fluorescence or chroma testing.