116results about How to "High Luminous Quantum Efficiency" patented technology

The invention discloses a preparation method of a composite luminescent fiber nanomaterial. The preparation method comprises the steps: reacting a rare earth complex or a rare-earth-doped nanocrystal with a polymer monomer to form a core-shell structured compound; demulsifying, separating and drying the compound to obtain a rare-earth complex-polymer or rare-earth-doped nanocrystal-polymer composite nanoparticle powder; and preparing the composite nanoparticle power into an electrospinning solution, and preparing the electrospinning solution into the composite luminescent fiber nanomaterial with an electrospining method. The invention provides a new approach to preparation of a rare-earth organic-inorganic composite fiber nanomaterial with good dispersity, high orientation property, strong chemical stability and high luminous efficiency. The composite luminescent fiber nanomaterial is about to achieve important application values in the fields of optical communication, laser, communication and transportation, sailing fire fighting, raining working, bioinstrumentation and biochip, submarine signal transmission and solar photovoltaic cells.

The invention relates to novel luminescent material synthesis technologies, in particular to a novel binuclear copper (I) complex blue-light material and a method for preparing the same. The molecular formula of the blue-light material, namely a perchlorate di-[5-tertiary butyl-3-(2-pyridyl)-1,2,4-triazole] di-[N,N-dual(diphenyl phosphorous) amine] dimeric copper (I) complex, is C<70>H<70>Cl<2>Cu<2>N<10>O<8>P<4>, and the molecular weight of the blue-light material is 1501.26. The novel binuclear copper (I) complex blue-light material and the method have the advantages that as shown by luminescence test results, the novel binuclear copper (I) complex blue-light material is excellent in solid photo-luminescence performance, a powerful blue-light emission property can be realized, the maximum blue-light emission value is 439nm, and the luminescent quantum efficiency is 34%.

The invention discloses bivalent manganese-doped full inorganic perovskite quantum dot glass. The bivalent manganese-doped full inorganic perovskite quantum dot glass is prepared from 25 to 45 percentof B2O3, 25 to 45 percent of SiO2, 1 to 10 percent of MCO3, 1 to 10 percent of Al2O3, 1 to 5 percent of ZnO, 1 to 10 percent of Cs2CO3, 1 to 10 percent of PbCl2, 1 to 10 percent of NaCl and 1 to 10 percent of MnCl2, wherein M is Ca, Sr or Ba. The preparation method of the quantum dot glass comprises the following steps: grinding all raw material components of the glass and melting after uniform mixing; then carrying out compression molding on a melt, annealing and carrying out heat treatment, thus obtaining the bivalent manganese-doped full inorganic perovskite quantum dot glass by carrying out heat treatment with different temperatures. The quantum dot-doped glass prepared by the invention has the advantages of good chemical stability and higher fluorescence quantum efficiency, and is aluminescent material with a promising application prospect.

The invention relates to a Li/Mg-codoped bi-perovskite red fluorescent powder and preparation method of same, wherein the red fluorescent powder is characterized by being represented as the following formula: Na(Gd<1-x-y-z>Eu<x>Li<y>Mg<z>)MgWO6, wherein 0.05 <= x <= 0.2, 0.02 <= y <= 0.1 and 0.02 <= z <= 0.2. The red fluorescent powder is prepared through a solid-phase method. In the invention, bi-perovskite NaGdMgWO6 is employed as a basic structure material, europium is employed as a red luminescent center and the codoped lithium and magnesium are employed as sensitization sources and are used for providing a fluxing effect, wherein the three mentioned above substitute the position of gadolinium in the bi-perovskite NaGdMgWO6 to generate low crystal lattice symmetry, thereby ensuring stability, high efficiency and high color rendering property of the fluorescent powder. In addition, the fluorescent powder is prepared through a conventional solid-phase method which is simple in operation and is controllable in process.

The invention belongs to the technical field of perovskite-like nanocrystals. The invention discloses a preparation method of Cs<3>Cu<2>X<5> nanocrystalline and a product. The preparation method comprises the steps that indium halide InX3 or zinc halide ZnX2 is additionally introduced into a precursor solution for preparing Cs<3>Cu<2>X<5> nanocrystalline through a thermal injection method, preparing the Cs<3>Cu<2>X<5> nanocrystalline through a thermal injection method, wherein X is selected from Cl, Br and I. According to the preparation method, a key precursor for regulating and controlling the growth of the nanocrystalline in the preparation method of the nanocrystalline is improved; indium halide or zinc halide is used as an additive in a precursor, and a copper element is used as a substitute of a lead element, so that the preparation of the lead-free metal halide light-emitting nanocrystal is completed, the preparation process is easy to implement, the cost is low, and meanwhile,the defects of the lead-containing halogen perovskite nanocrystal can be overcome.

The invention relates to a water-soluble high-efficiency rare-earth luminescent material and a preparation method of a transparent film made from the same. The water-soluble high-efficiency rare-earth luminescent material comprises LAPONITE RD nano-clay, ionic liquid and water, wherein the LAPONITE RD nano-clay contains a luminescent rare-earth organic complex; the ionic liquid contains oxygen; the mass ratio of the LAPONITE RD nano-clay which contains the luminescent rare-earth organic complex to the ionic liquid which contains the oxygen is 1:(1-3); the mass of the water accounts for 80%-85% of the rare-earth luminescent material; the average particle diameter of the LAPONITE RD nano-clay is 30 nanometers, and the mass percentage of rare-earth ions contained in the LAPONITE RD nano-clay is 6%-7.5%. The water-soluble high-efficiency rare-earth luminescent material disclosed by the invention takes a large amount of water as a medium, can not only increase the efficiency of luminous quantum, but also enhance the dissolution concentration of the rare-earth ions in an inorganic matrix and the luminescent property.

The invention relates to a new luminescent material, in particular to a novel mononuclear copper (I) complex blue light material and a preparation method thereof. The novel mononuclear copper (I) complex blue light material is perchlorate 5-tertiary butyl-3-[2-pyridyl]-1, 2, 4-triazole-bis [triphenylphosphine] copper [I] complex, the molecular formula is C47H44ClCuN4O4P2, and the molecular weight is 889.82. The mononuclear copper (I) complex blue light material provided by the invention is mainly used for luminescent materials in daily lighting, luminescent display and optical sensors. Photoluminescence property test results show that the copper (I) complex has good photoluminescence property in the solid state, strong pure blue light emission is represented, and the maximum value is located at 455 nm.

The invention discloses an ionic rare-earth complex luminescent material, a preparation method therefor and application therefor. The structural formula of the rare-earth complex is [Ln(ND)4]M, wherein ND is a 4-hydroxyl-1,5-naphthyridine anionic ligand; Ln represents rare earth ions comprising yttrium, lanthanum, europium, gadolinium, terbium, ytterbium ions; M is counter cations comprising alkali metal ions, alkyl substituted quaternary ammonium ions, alkyl substituted quaternary phosphonium ions, l,3-dialkyl substituted imidazolium ions and N-alkyl substituted pyridinium ions. According to the europium complex provided by the invention, the ligand is hardly dissociated and the complex is high in thermal decomposition temperature; furthermore, the europium complex further has a high-efficiency photoluminescent quantum yield and good resistance to ultraviolet light, and can be used as photoluminescent and electroluminescent materials.

The invention relates to medium-infrared gain sulfide optical fibers and a preparation method thereof, and belongs to laser gain optical fibers and a preparation method thereof. According to the present invention, the optical fiber core material is a rare earth ion doped Ga-Sb-As-S glass, the optical fiber cladding material is a Ga-Sb-As-S glass, the refractive index of the optical fiber core glass is greater than the refractive index of the cladding glad, the chemical formula of the Ga-Sb-As-S glass is Ga(1-x-y-z)SbxAsySz, x is 0.26-0.32, y is 0.02-0.06, z is 0.55-0.65, the rare earth ion is one selected from Dy<3+>, Er<3+> and Tm<3+>, and the molar concentration of the doped rare earth ions is 0.05-1%; the optical fibers are prepared through a rod tube method, wherein the fiber core glass and the cladding glass are respectively prepared into the thin rod and the bushing, the fiber core glass thin rod is inserted into the cladding glass bushing, and drawing is performed to obtain the optical fibers having the final size; and the gain sulfide optical fibers have strong luminescence at a wavelength of 2.5-5 [mu]m, the luminescence quantum efficiency is greater than 70%, and the gain sulfide optical fibers can be adopted as the core gain medium of the low-cost and compact medium-infrared optical fiber laser.

The invention discloses a Cr<3+> doped near-infrared wide-spectrum luminescent material and a preparation method thereof, which belong to the technical field of near-infrared luminescent materials. The general chemical formula is Ca3Y2-xGe3O12: xCr<3+>, and x is greater than or equal to 0.01 mol% and less than or equal to 20 mol%. The near-infrared luminescent material belongs to a cubic crystal system and has a garnet type space crystal structure the same as Ca3Y2Ge3O12, the space group is Ia3d, Ca<2+> occupies dodecahedron octa-coordination, Y<3+> occupies octahedron hexa-coordination, and Ge<4+> occupies tetrahedron tetra-coordination. The material is wide in excitation spectrum, the optimal excitation wavelength ranges from 400 nm to 550 nm, and the emission wavelength ranges from 700nm to 1200 nm. The material is matched with a blue-light LED chip, can be used for manufacturing a wide-spectrum near-infrared light source, and is applied to the fields of plant illumination, biological probes, military affairs and the like. The method is simple in preparation process, low in raw material price and easy to synthesize.

A phosphor includes a host crystal including Sr₃MgSi₂O₈ crystal and SrMgSiO₄ crystal and also includes Eu²⁺, or Eu²⁺ and Mn²⁺ as luminescent centers. Alternatively, a phosphor includes a host crystal including Sr₃MgSi₂O₈ crystal and SrMgSiO₄ and also includes Eu²⁺ as a luminescent center, the phosphor being free from Mn²⁺ as a luminescent center. A light-emitting device includes a phosphor layer containing the phosphor. A projector and a vehicle include the light-emitting device.

The invention provides a novel garnet-based high efficiency green phosphor, a chemical formula is [(Gd1-xLux)1-yTby]Al5O12 (short for (Gd, Lu)AG:Tb<3+>), wherein x is Lu/(Gd+Lu+Tb) and y is Tb/(Gd+Lu+Tb)(x is 0-1.0, y is 0-0.15). The phosphor takes rare earth nitrate and an ammonium aluminium sulfate according to stoichiometric ratio to prepare a mother salting liquid, the mother salting liquid is dropped into a NH4HCO3 precipitating agent solution, the obtained deposition is centrifuged, washed, and dried to obtain the white precursor powder, and phosphor (Gd, Lu)AG:Tb<3+> can be obtained through calcining at different temperature. non radiation energy transmission of Gd<3+> to Tb<3+> is existed, the fluorescence quantum efficiency is high, addition of Lu can obvious improve the stability of a system, and is more suitable for a scintillator material.